Added thirdparty: boost library

thirdparty/include/boost/unordered/concurrent_flat_map.hpp

@@ -0,0 +1,860 @@
+/* Fast open-addressing concurrent hashmap.
+ *
+ * Copyright 2023 Christian Mazakas.
+ * Copyright 2023 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_CONCURRENT_FLAT_MAP_HPP
+#define BOOST_UNORDERED_CONCURRENT_FLAT_MAP_HPP
+
+#include <boost/unordered/concurrent_flat_map_fwd.hpp>
+#include <boost/unordered/detail/concurrent_static_asserts.hpp>
+#include <boost/unordered/detail/foa/concurrent_table.hpp>
+#include <boost/unordered/detail/foa/flat_map_types.hpp>
+#include <boost/unordered/detail/type_traits.hpp>
+#include <boost/unordered/unordered_flat_map_fwd.hpp>
+
+#include <boost/container_hash/hash.hpp>
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/serialization.hpp>
+
+#include <type_traits>
+
+namespace boost {
+  namespace unordered {
+    template <class Key, class T, class Hash, class Pred, class Allocator>
+    class concurrent_flat_map
+    {
+    private:
+      template <class Key2, class T2, class Hash2, class Pred2,
+        class Allocator2>
+      friend class concurrent_flat_map;
+      template <class Key2, class T2, class Hash2, class Pred2,
+        class Allocator2>
+      friend class unordered_flat_map;
+
+      using type_policy = detail::foa::flat_map_types<Key, T>;
+
+      using table_type =
+        detail::foa::concurrent_table<type_policy, Hash, Pred, Allocator>;
+
+      table_type table_;
+
+      template <class K, class V, class H, class KE, class A>
+      bool friend operator==(concurrent_flat_map<K, V, H, KE, A> const& lhs,
+        concurrent_flat_map<K, V, H, KE, A> const& rhs);
+
+      template <class K, class V, class H, class KE, class A, class Predicate>
+      friend typename concurrent_flat_map<K, V, H, KE, A>::size_type erase_if(
+        concurrent_flat_map<K, V, H, KE, A>& set, Predicate pred);
+
+      template<class Archive, class K, class V, class H, class KE, class A>
+      friend void serialize(
+        Archive& ar, concurrent_flat_map<K, V, H, KE, A>& c,
+        unsigned int version);
+
+    public:
+      using key_type = Key;
+      using mapped_type = T;
+      using value_type = typename type_policy::value_type;
+      using init_type = typename type_policy::init_type;
+      using size_type = std::size_t;
+      using difference_type = std::ptrdiff_t;
+      using hasher = typename boost::unordered::detail::type_identity<Hash>::type;
+      using key_equal = typename boost::unordered::detail::type_identity<Pred>::type;
+      using allocator_type = typename boost::unordered::detail::type_identity<Allocator>::type;
+      using reference = value_type&;
+      using const_reference = value_type const&;
+      using pointer = typename boost::allocator_pointer<allocator_type>::type;
+      using const_pointer =
+        typename boost::allocator_const_pointer<allocator_type>::type;
+      static constexpr size_type bulk_visit_size = table_type::bulk_visit_size;
+
+      concurrent_flat_map()
+          : concurrent_flat_map(detail::foa::default_bucket_count)
+      {
+      }
+
+      explicit concurrent_flat_map(size_type n, const hasher& hf = hasher(),
+        const key_equal& eql = key_equal(),
+        const allocator_type& a = allocator_type())
+          : table_(n, hf, eql, a)
+      {
+      }
+
+      template <class InputIterator>
+      concurrent_flat_map(InputIterator f, InputIterator l,
+        size_type n = detail::foa::default_bucket_count,
+        const hasher& hf = hasher(), const key_equal& eql = key_equal(),
+        const allocator_type& a = allocator_type())
+          : table_(n, hf, eql, a)
+      {
+        this->insert(f, l);
+      }
+
+      concurrent_flat_map(concurrent_flat_map const& rhs)
+          : table_(rhs.table_,
+              boost::allocator_select_on_container_copy_construction(
+                rhs.get_allocator()))
+      {
+      }
+
+      concurrent_flat_map(concurrent_flat_map&& rhs)
+          : table_(std::move(rhs.table_))
+      {
+      }
+
+      template <class InputIterator>
+      concurrent_flat_map(
+        InputIterator f, InputIterator l, allocator_type const& a)
+          : concurrent_flat_map(f, l, 0, hasher(), key_equal(), a)
+      {
+      }
+
+      explicit concurrent_flat_map(allocator_type const& a)
+          : table_(detail::foa::default_bucket_count, hasher(), key_equal(), a)
+      {
+      }
+
+      concurrent_flat_map(
+        concurrent_flat_map const& rhs, allocator_type const& a)
+          : table_(rhs.table_, a)
+      {
+      }
+
+      concurrent_flat_map(concurrent_flat_map&& rhs, allocator_type const& a)
+          : table_(std::move(rhs.table_), a)
+      {
+      }
+
+      concurrent_flat_map(std::initializer_list<value_type> il,
+        size_type n = detail::foa::default_bucket_count,
+        const hasher& hf = hasher(), const key_equal& eql = key_equal(),
+        const allocator_type& a = allocator_type())
+          : concurrent_flat_map(n, hf, eql, a)
+      {
+        this->insert(il.begin(), il.end());
+      }
+
+      concurrent_flat_map(size_type n, const allocator_type& a)
+          : concurrent_flat_map(n, hasher(), key_equal(), a)
+      {
+      }
+
+      concurrent_flat_map(
+        size_type n, const hasher& hf, const allocator_type& a)
+          : concurrent_flat_map(n, hf, key_equal(), a)
+      {
+      }
+
+      template <typename InputIterator>
+      concurrent_flat_map(
+        InputIterator f, InputIterator l, size_type n, const allocator_type& a)
+          : concurrent_flat_map(f, l, n, hasher(), key_equal(), a)
+      {
+      }
+
+      template <typename InputIterator>
+      concurrent_flat_map(InputIterator f, InputIterator l, size_type n,
+        const hasher& hf, const allocator_type& a)
+          : concurrent_flat_map(f, l, n, hf, key_equal(), a)
+      {
+      }
+
+      concurrent_flat_map(
+        std::initializer_list<value_type> il, const allocator_type& a)
+          : concurrent_flat_map(
+              il, detail::foa::default_bucket_count, hasher(), key_equal(), a)
+      {
+      }
+
+      concurrent_flat_map(std::initializer_list<value_type> il, size_type n,
+        const allocator_type& a)
+          : concurrent_flat_map(il, n, hasher(), key_equal(), a)
+      {
+      }
+
+      concurrent_flat_map(std::initializer_list<value_type> il, size_type n,
+        const hasher& hf, const allocator_type& a)
+          : concurrent_flat_map(il, n, hf, key_equal(), a)
+      {
+      }
+
+
+      concurrent_flat_map(
+        unordered_flat_map<Key, T, Hash, Pred, Allocator>&& other)
+          : table_(std::move(other.table_))
+      {
+      }
+
+      ~concurrent_flat_map() = default;
+
+      concurrent_flat_map& operator=(concurrent_flat_map const& rhs)
+      {
+        table_ = rhs.table_;
+        return *this;
+      }
+
+      concurrent_flat_map& operator=(concurrent_flat_map&& rhs) noexcept(
+        noexcept(std::declval<table_type&>() = std::declval<table_type&&>()))
+      {
+        table_ = std::move(rhs.table_);
+        return *this;
+      }
+
+      concurrent_flat_map& operator=(std::initializer_list<value_type> ilist)
+      {
+        table_ = ilist;
+        return *this;
+      }
+
+      /// Capacity
+      ///
+
+      size_type size() const noexcept { return table_.size(); }
+      size_type max_size() const noexcept { return table_.max_size(); }
+
+      BOOST_ATTRIBUTE_NODISCARD bool empty() const noexcept
+      {
+        return size() == 0;
+      }
+
+      template <class F>
+      BOOST_FORCEINLINE size_type visit(key_type const& k, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
+        return table_.visit(k, f);
+      }
+
+      template <class F>
+      BOOST_FORCEINLINE size_type visit(key_type const& k, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.visit(k, f);
+      }
+
+      template <class F>
+      BOOST_FORCEINLINE size_type cvisit(key_type const& k, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.visit(k, f);
+      }
+
+      template <class K, class F>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value, size_type>::type
+      visit(K&& k, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
+        return table_.visit(std::forward<K>(k), f);
+      }
+
+      template <class K, class F>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value, size_type>::type
+      visit(K&& k, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.visit(std::forward<K>(k), f);
+      }
+
+      template <class K, class F>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value, size_type>::type
+      cvisit(K&& k, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.visit(std::forward<K>(k), f);
+      }
+
+      template<class FwdIterator, class F>
+      BOOST_FORCEINLINE
+      size_t visit(FwdIterator first, FwdIterator last, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_BULK_VISIT_ITERATOR(FwdIterator)
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
+        return table_.visit(first, last, f);
+      }
+
+      template<class FwdIterator, class F>
+      BOOST_FORCEINLINE
+      size_t visit(FwdIterator first, FwdIterator last, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_BULK_VISIT_ITERATOR(FwdIterator)
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.visit(first, last, f);
+      }
+
+      template<class FwdIterator, class F>
+      BOOST_FORCEINLINE
+      size_t cvisit(FwdIterator first, FwdIterator last, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_BULK_VISIT_ITERATOR(FwdIterator)
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.visit(first, last, f);
+      }
+
+      template <class F> size_type visit_all(F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
+        return table_.visit_all(f);
+      }
+
+      template <class F> size_type visit_all(F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.visit_all(f);
+      }
+
+      template <class F> size_type cvisit_all(F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.cvisit_all(f);
+      }
+
+#if defined(BOOST_UNORDERED_PARALLEL_ALGORITHMS)
+      template <class ExecPolicy, class F>
+      typename std::enable_if<detail::is_execution_policy<ExecPolicy>::value,
+        void>::type
+      visit_all(ExecPolicy&& p, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
+        BOOST_UNORDERED_STATIC_ASSERT_EXEC_POLICY(ExecPolicy)
+        table_.visit_all(p, f);
+      }
+
+      template <class ExecPolicy, class F>
+      typename std::enable_if<detail::is_execution_policy<ExecPolicy>::value,
+        void>::type
+      visit_all(ExecPolicy&& p, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        BOOST_UNORDERED_STATIC_ASSERT_EXEC_POLICY(ExecPolicy)
+        table_.visit_all(p, f);
+      }
+
+      template <class ExecPolicy, class F>
+      typename std::enable_if<detail::is_execution_policy<ExecPolicy>::value,
+        void>::type
+      cvisit_all(ExecPolicy&& p, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        BOOST_UNORDERED_STATIC_ASSERT_EXEC_POLICY(ExecPolicy)
+        table_.cvisit_all(p, f);
+      }
+#endif
+
+      template <class F> bool visit_while(F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
+        return table_.visit_while(f);
+      }
+
+      template <class F> bool visit_while(F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.visit_while(f);
+      }
+
+      template <class F> bool cvisit_while(F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.cvisit_while(f);
+      }
+
+#if defined(BOOST_UNORDERED_PARALLEL_ALGORITHMS)
+      template <class ExecPolicy, class F>
+      typename std::enable_if<detail::is_execution_policy<ExecPolicy>::value,
+        bool>::type
+      visit_while(ExecPolicy&& p, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
+        BOOST_UNORDERED_STATIC_ASSERT_EXEC_POLICY(ExecPolicy)
+        return table_.visit_while(p, f);
+      }
+
+      template <class ExecPolicy, class F>
+      typename std::enable_if<detail::is_execution_policy<ExecPolicy>::value,
+        bool>::type
+      visit_while(ExecPolicy&& p, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        BOOST_UNORDERED_STATIC_ASSERT_EXEC_POLICY(ExecPolicy)
+        return table_.visit_while(p, f);
+      }
+
+      template <class ExecPolicy, class F>
+      typename std::enable_if<detail::is_execution_policy<ExecPolicy>::value,
+        bool>::type
+      cvisit_while(ExecPolicy&& p, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        BOOST_UNORDERED_STATIC_ASSERT_EXEC_POLICY(ExecPolicy)
+        return table_.cvisit_while(p, f);
+      }
+#endif
+
+      /// Modifiers
+      ///
+
+      template <class Ty>
+      BOOST_FORCEINLINE auto insert(Ty&& value)
+        -> decltype(table_.insert(std::forward<Ty>(value)))
+      {
+        return table_.insert(std::forward<Ty>(value));
+      }
+
+      BOOST_FORCEINLINE bool insert(init_type&& obj)
+      {
+        return table_.insert(std::move(obj));
+      }
+
+      template <class InputIterator>
+      void insert(InputIterator begin, InputIterator end)
+      {
+        for (auto pos = begin; pos != end; ++pos) {
+          table_.emplace(*pos);
+        }
+      }
+
+      void insert(std::initializer_list<value_type> ilist)
+      {
+        this->insert(ilist.begin(), ilist.end());
+      }
+
+      template <class M>
+      BOOST_FORCEINLINE bool insert_or_assign(key_type const& k, M&& obj)
+      {
+        return table_.try_emplace_or_visit(k, std::forward<M>(obj),
+          [&](value_type& m) { m.second = std::forward<M>(obj); });
+      }
+
+      template <class M>
+      BOOST_FORCEINLINE bool insert_or_assign(key_type&& k, M&& obj)
+      {
+        return table_.try_emplace_or_visit(std::move(k), std::forward<M>(obj),
+          [&](value_type& m) { m.second = std::forward<M>(obj); });
+      }
+
+      template <class K, class M>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value, bool>::type
+      insert_or_assign(K&& k, M&& obj)
+      {
+        return table_.try_emplace_or_visit(std::forward<K>(k),
+          std::forward<M>(obj),
+          [&](value_type& m) { m.second = std::forward<M>(obj); });
+      }
+
+      template <class Ty, class F>
+      BOOST_FORCEINLINE auto insert_or_visit(Ty&& value, F f)
+        -> decltype(table_.insert_or_visit(std::forward<Ty>(value), f))
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
+        return table_.insert_or_visit(std::forward<Ty>(value), f);
+      }
+
+      template <class F>
+      BOOST_FORCEINLINE bool insert_or_visit(init_type&& obj, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
+        return table_.insert_or_visit(std::move(obj), f);
+      }
+
+      template <class InputIterator, class F>
+      void insert_or_visit(InputIterator first, InputIterator last, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
+        for (; first != last; ++first) {
+          table_.emplace_or_visit(*first, f);
+        }
+      }
+
+      template <class F>
+      void insert_or_visit(std::initializer_list<value_type> ilist, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)
+        this->insert_or_visit(ilist.begin(), ilist.end(), f);
+      }
+
+      template <class Ty, class F>
+      BOOST_FORCEINLINE auto insert_or_cvisit(Ty&& value, F f)
+        -> decltype(table_.insert_or_cvisit(std::forward<Ty>(value), f))
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.insert_or_cvisit(std::forward<Ty>(value), f);
+      }
+
+      template <class F>
+      BOOST_FORCEINLINE bool insert_or_cvisit(init_type&& obj, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.insert_or_cvisit(std::move(obj), f);
+      }
+
+      template <class InputIterator, class F>
+      void insert_or_cvisit(InputIterator first, InputIterator last, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        for (; first != last; ++first) {
+          table_.emplace_or_cvisit(*first, f);
+        }
+      }
+
+      template <class F>
+      void insert_or_cvisit(std::initializer_list<value_type> ilist, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        this->insert_or_cvisit(ilist.begin(), ilist.end(), f);
+      }
+
+      template <class... Args> BOOST_FORCEINLINE bool emplace(Args&&... args)
+      {
+        return table_.emplace(std::forward<Args>(args)...);
+      }
+
+      template <class Arg, class... Args>
+      BOOST_FORCEINLINE bool emplace_or_visit(Arg&& arg, Args&&... args)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_LAST_ARG_INVOCABLE(Arg, Args...)
+        return table_.emplace_or_visit(
+          std::forward<Arg>(arg), std::forward<Args>(args)...);
+      }
+
+      template <class Arg, class... Args>
+      BOOST_FORCEINLINE bool emplace_or_cvisit(Arg&& arg, Args&&... args)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_LAST_ARG_CONST_INVOCABLE(Arg, Args...)
+        return table_.emplace_or_cvisit(
+          std::forward<Arg>(arg), std::forward<Args>(args)...);
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE bool try_emplace(key_type const& k, Args&&... args)
+      {
+        return table_.try_emplace(k, std::forward<Args>(args)...);
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE bool try_emplace(key_type&& k, Args&&... args)
+      {
+        return table_.try_emplace(std::move(k), std::forward<Args>(args)...);
+      }
+
+      template <class K, class... Args>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value, bool>::type
+      try_emplace(K&& k, Args&&... args)
+      {
+        return table_.try_emplace(
+          std::forward<K>(k), std::forward<Args>(args)...);
+      }
+
+      template <class Arg, class... Args>
+      BOOST_FORCEINLINE bool try_emplace_or_visit(
+        key_type const& k, Arg&& arg, Args&&... args)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_LAST_ARG_INVOCABLE(Arg, Args...)
+        return table_.try_emplace_or_visit(
+          k, std::forward<Arg>(arg), std::forward<Args>(args)...);
+      }
+
+      template <class Arg, class... Args>
+      BOOST_FORCEINLINE bool try_emplace_or_cvisit(
+        key_type const& k, Arg&& arg, Args&&... args)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_LAST_ARG_CONST_INVOCABLE(Arg, Args...)
+        return table_.try_emplace_or_cvisit(
+          k, std::forward<Arg>(arg), std::forward<Args>(args)...);
+      }
+
+      template <class Arg, class... Args>
+      BOOST_FORCEINLINE bool try_emplace_or_visit(
+        key_type&& k, Arg&& arg, Args&&... args)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_LAST_ARG_INVOCABLE(Arg, Args...)
+        return table_.try_emplace_or_visit(
+          std::move(k), std::forward<Arg>(arg), std::forward<Args>(args)...);
+      }
+
+      template <class Arg, class... Args>
+      BOOST_FORCEINLINE bool try_emplace_or_cvisit(
+        key_type&& k, Arg&& arg, Args&&... args)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_LAST_ARG_CONST_INVOCABLE(Arg, Args...)
+        return table_.try_emplace_or_cvisit(
+          std::move(k), std::forward<Arg>(arg), std::forward<Args>(args)...);
+      }
+
+      template <class K, class Arg, class... Args>
+      BOOST_FORCEINLINE bool try_emplace_or_visit(
+        K&& k, Arg&& arg, Args&&... args)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_LAST_ARG_INVOCABLE(Arg, Args...)
+        return table_.try_emplace_or_visit(std::forward<K>(k),
+          std::forward<Arg>(arg), std::forward<Args>(args)...);
+      }
+
+      template <class K, class Arg, class... Args>
+      BOOST_FORCEINLINE bool try_emplace_or_cvisit(
+        K&& k, Arg&& arg, Args&&... args)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_LAST_ARG_CONST_INVOCABLE(Arg, Args...)
+        return table_.try_emplace_or_cvisit(std::forward<K>(k),
+          std::forward<Arg>(arg), std::forward<Args>(args)...);
+      }
+
+      BOOST_FORCEINLINE size_type erase(key_type const& k)
+      {
+        return table_.erase(k);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value, size_type>::type
+      erase(K&& k)
+      {
+        return table_.erase(std::forward<K>(k));
+      }
+
+      template <class F>
+      BOOST_FORCEINLINE size_type erase_if(key_type const& k, F f)
+      {
+        return table_.erase_if(k, f);
+      }
+
+      template <class K, class F>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value &&
+          !detail::is_execution_policy<K>::value,
+        size_type>::type
+      erase_if(K&& k, F f)
+      {
+        return table_.erase_if(std::forward<K>(k), f);
+      }
+
+#if defined(BOOST_UNORDERED_PARALLEL_ALGORITHMS)
+      template <class ExecPolicy, class F>
+      typename std::enable_if<detail::is_execution_policy<ExecPolicy>::value,
+        void>::type
+      erase_if(ExecPolicy&& p, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_EXEC_POLICY(ExecPolicy)
+        table_.erase_if(p, f);
+      }
+#endif
+
+      template <class F> size_type erase_if(F f) { return table_.erase_if(f); }
+
+      void swap(concurrent_flat_map& other) noexcept(
+        boost::allocator_is_always_equal<Allocator>::type::value ||
+        boost::allocator_propagate_on_container_swap<Allocator>::type::value)
+      {
+        return table_.swap(other.table_);
+      }
+
+      void clear() noexcept { table_.clear(); }
+
+      template <typename H2, typename P2>
+      size_type merge(concurrent_flat_map<Key, T, H2, P2, Allocator>& x)
+      {
+        BOOST_ASSERT(get_allocator() == x.get_allocator());
+        return table_.merge(x.table_);
+      }
+
+      template <typename H2, typename P2>
+      size_type merge(concurrent_flat_map<Key, T, H2, P2, Allocator>&& x)
+      {
+        return merge(x);
+      }
+
+      BOOST_FORCEINLINE size_type count(key_type const& k) const
+      {
+        return table_.count(k);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value, size_type>::type
+      count(K const& k)
+      {
+        return table_.count(k);
+      }
+
+      BOOST_FORCEINLINE bool contains(key_type const& k) const
+      {
+        return table_.contains(k);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value, bool>::type
+      contains(K const& k) const
+      {
+        return table_.contains(k);
+      }
+
+      /// Hash Policy
+      ///
+      size_type bucket_count() const noexcept { return table_.capacity(); }
+
+      float load_factor() const noexcept { return table_.load_factor(); }
+      float max_load_factor() const noexcept
+      {
+        return table_.max_load_factor();
+      }
+      void max_load_factor(float) {}
+      size_type max_load() const noexcept { return table_.max_load(); }
+
+      void rehash(size_type n) { table_.rehash(n); }
+      void reserve(size_type n) { table_.reserve(n); }
+
+      /// Observers
+      ///
+      allocator_type get_allocator() const noexcept
+      {
+        return table_.get_allocator();
+      }
+
+      hasher hash_function() const { return table_.hash_function(); }
+      key_equal key_eq() const { return table_.key_eq(); }
+    };
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    bool operator==(
+      concurrent_flat_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
+      concurrent_flat_map<Key, T, Hash, KeyEqual, Allocator> const& rhs)
+    {
+      return lhs.table_ == rhs.table_;
+    }
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    bool operator!=(
+      concurrent_flat_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
+      concurrent_flat_map<Key, T, Hash, KeyEqual, Allocator> const& rhs)
+    {
+      return !(lhs == rhs);
+    }
+
+    template <class Key, class T, class Hash, class Pred, class Alloc>
+    void swap(concurrent_flat_map<Key, T, Hash, Pred, Alloc>& x,
+      concurrent_flat_map<Key, T, Hash, Pred, Alloc>& y)
+      noexcept(noexcept(x.swap(y)))
+    {
+      x.swap(y);
+    }
+
+    template <class K, class T, class H, class P, class A, class Predicate>
+    typename concurrent_flat_map<K, T, H, P, A>::size_type erase_if(
+      concurrent_flat_map<K, T, H, P, A>& c, Predicate pred)
+    {
+      return c.table_.erase_if(pred);
+    }
+
+    template<class Archive, class K, class V, class H, class KE, class A>
+    void serialize(
+      Archive& ar, concurrent_flat_map<K, V, H, KE, A>& c, unsigned int)
+    {
+      ar & core::make_nvp("table",c.table_);
+    }
+
+#if BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
+
+    template <class InputIterator,
+      class Hash =
+        boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
+      class Pred =
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+      class Allocator = std::allocator<
+        boost::unordered::detail::iter_to_alloc_t<InputIterator> >,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_map(InputIterator, InputIterator,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> concurrent_flat_map<
+        boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>, Hash, Pred,
+        Allocator>;
+
+    template <class Key, class T,
+      class Hash = boost::hash<std::remove_const_t<Key> >,
+      class Pred = std::equal_to<std::remove_const_t<Key> >,
+      class Allocator = std::allocator<std::pair<const Key, T> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_map(std::initializer_list<std::pair<Key, T> >,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> concurrent_flat_map<std::remove_const_t<Key>, T, Hash, Pred,
+        Allocator>;
+
+    template <class InputIterator, class Allocator,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_map(InputIterator, InputIterator, std::size_t, Allocator)
+      -> concurrent_flat_map<
+        boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>,
+        boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+        Allocator>;
+
+    template <class InputIterator, class Allocator,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_map(InputIterator, InputIterator, Allocator)
+      -> concurrent_flat_map<
+        boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>,
+        boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+        Allocator>;
+
+    template <class InputIterator, class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_map(
+      InputIterator, InputIterator, std::size_t, Hash, Allocator)
+      -> concurrent_flat_map<
+        boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>, Hash,
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+        Allocator>;
+
+    template <class Key, class T, class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_map(std::initializer_list<std::pair<Key, T> >, std::size_t,
+      Allocator) -> concurrent_flat_map<std::remove_const_t<Key>, T,
+      boost::hash<std::remove_const_t<Key> >,
+      std::equal_to<std::remove_const_t<Key> >, Allocator>;
+
+    template <class Key, class T, class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_map(std::initializer_list<std::pair<Key, T> >, Allocator)
+      -> concurrent_flat_map<std::remove_const_t<Key>, T,
+        boost::hash<std::remove_const_t<Key> >,
+        std::equal_to<std::remove_const_t<Key> >, Allocator>;
+
+    template <class Key, class T, class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_map(std::initializer_list<std::pair<Key, T> >, std::size_t,
+      Hash, Allocator) -> concurrent_flat_map<std::remove_const_t<Key>, T,
+      Hash, std::equal_to<std::remove_const_t<Key> >, Allocator>;
+
+#endif
+
+  } // namespace unordered
+} // namespace boost
+
+#endif // BOOST_UNORDERED_CONCURRENT_FLAT_MAP_HPP

thirdparty/include/boost/unordered/concurrent_flat_map_fwd.hpp

@@ -0,0 +1,51 @@
+/* Fast open-addressing concurrent hashmap.
+ *
+ * Copyright 2023 Christian Mazakas.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_CONCURRENT_FLAT_MAP_FWD_HPP
+#define BOOST_UNORDERED_CONCURRENT_FLAT_MAP_FWD_HPP
+
+#include <boost/container_hash/hash_fwd.hpp>
+
+#include <functional>
+#include <memory>
+
+namespace boost {
+  namespace unordered {
+
+    template <class Key, class T, class Hash = boost::hash<Key>,
+      class Pred = std::equal_to<Key>,
+      class Allocator = std::allocator<std::pair<Key const, T> > >
+    class concurrent_flat_map;
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    bool operator==(
+      concurrent_flat_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
+      concurrent_flat_map<Key, T, Hash, KeyEqual, Allocator> const& rhs);
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    bool operator!=(
+      concurrent_flat_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
+      concurrent_flat_map<Key, T, Hash, KeyEqual, Allocator> const& rhs);
+
+    template <class Key, class T, class Hash, class Pred, class Alloc>
+    void swap(concurrent_flat_map<Key, T, Hash, Pred, Alloc>& x,
+      concurrent_flat_map<Key, T, Hash, Pred, Alloc>& y)
+      noexcept(noexcept(x.swap(y)));
+
+    template <class K, class T, class H, class P, class A, class Predicate>
+    typename concurrent_flat_map<K, T, H, P, A>::size_type erase_if(
+      concurrent_flat_map<K, T, H, P, A>& c, Predicate pred);
+
+  } // namespace unordered
+
+  using boost::unordered::concurrent_flat_map;
+} // namespace boost
+
+#endif // BOOST_UNORDERED_CONCURRENT_FLAT_MAP_HPP

thirdparty/include/boost/unordered/concurrent_flat_set.hpp

@@ -0,0 +1,716 @@
+/* Fast open-addressing concurrent hashset.
+ *
+ * Copyright 2023 Christian Mazakas.
+ * Copyright 2023 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_CONCURRENT_FLAT_SET_HPP
+#define BOOST_UNORDERED_CONCURRENT_FLAT_SET_HPP
+
+#include <boost/unordered/concurrent_flat_set_fwd.hpp>
+#include <boost/unordered/detail/concurrent_static_asserts.hpp>
+#include <boost/unordered/detail/foa/concurrent_table.hpp>
+#include <boost/unordered/detail/foa/flat_set_types.hpp>
+#include <boost/unordered/detail/type_traits.hpp>
+#include <boost/unordered/unordered_flat_set_fwd.hpp>
+
+#include <boost/container_hash/hash.hpp>
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/serialization.hpp>
+
+#include <utility>
+
+namespace boost {
+  namespace unordered {
+    template <class Key, class Hash, class Pred, class Allocator>
+    class concurrent_flat_set
+    {
+    private:
+      template <class Key2, class Hash2, class Pred2, class Allocator2>
+      friend class concurrent_flat_set;
+      template <class Key2, class Hash2, class Pred2, class Allocator2>
+      friend class unordered_flat_set;
+
+      using type_policy = detail::foa::flat_set_types<Key>;
+
+      using table_type =
+        detail::foa::concurrent_table<type_policy, Hash, Pred, Allocator>;
+
+      table_type table_;
+
+      template <class K, class H, class KE, class A>
+      bool friend operator==(concurrent_flat_set<K, H, KE, A> const& lhs,
+        concurrent_flat_set<K, H, KE, A> const& rhs);
+
+      template <class K, class H, class KE, class A, class Predicate>
+      friend typename concurrent_flat_set<K, H, KE, A>::size_type erase_if(
+        concurrent_flat_set<K, H, KE, A>& set, Predicate pred);
+
+      template<class Archive, class K, class H, class KE, class A>
+      friend void serialize(
+        Archive& ar, concurrent_flat_set<K, H, KE, A>& c,
+        unsigned int version);
+
+    public:
+      using key_type = Key;
+      using value_type = typename type_policy::value_type;
+      using init_type = typename type_policy::init_type;
+      using size_type = std::size_t;
+      using difference_type = std::ptrdiff_t;
+      using hasher = typename boost::unordered::detail::type_identity<Hash>::type;
+      using key_equal = typename boost::unordered::detail::type_identity<Pred>::type;
+      using allocator_type = typename boost::unordered::detail::type_identity<Allocator>::type;
+      using reference = value_type&;
+      using const_reference = value_type const&;
+      using pointer = typename boost::allocator_pointer<allocator_type>::type;
+      using const_pointer =
+        typename boost::allocator_const_pointer<allocator_type>::type;
+      static constexpr size_type bulk_visit_size = table_type::bulk_visit_size;
+
+      concurrent_flat_set()
+          : concurrent_flat_set(detail::foa::default_bucket_count)
+      {
+      }
+
+      explicit concurrent_flat_set(size_type n, const hasher& hf = hasher(),
+        const key_equal& eql = key_equal(),
+        const allocator_type& a = allocator_type())
+          : table_(n, hf, eql, a)
+      {
+      }
+
+      template <class InputIterator>
+      concurrent_flat_set(InputIterator f, InputIterator l,
+        size_type n = detail::foa::default_bucket_count,
+        const hasher& hf = hasher(), const key_equal& eql = key_equal(),
+        const allocator_type& a = allocator_type())
+          : table_(n, hf, eql, a)
+      {
+        this->insert(f, l);
+      }
+
+      concurrent_flat_set(concurrent_flat_set const& rhs)
+          : table_(rhs.table_,
+              boost::allocator_select_on_container_copy_construction(
+                rhs.get_allocator()))
+      {
+      }
+
+      concurrent_flat_set(concurrent_flat_set&& rhs)
+          : table_(std::move(rhs.table_))
+      {
+      }
+
+      template <class InputIterator>
+      concurrent_flat_set(
+        InputIterator f, InputIterator l, allocator_type const& a)
+          : concurrent_flat_set(f, l, 0, hasher(), key_equal(), a)
+      {
+      }
+
+      explicit concurrent_flat_set(allocator_type const& a)
+          : table_(detail::foa::default_bucket_count, hasher(), key_equal(), a)
+      {
+      }
+
+      concurrent_flat_set(
+        concurrent_flat_set const& rhs, allocator_type const& a)
+          : table_(rhs.table_, a)
+      {
+      }
+
+      concurrent_flat_set(concurrent_flat_set&& rhs, allocator_type const& a)
+          : table_(std::move(rhs.table_), a)
+      {
+      }
+
+      concurrent_flat_set(std::initializer_list<value_type> il,
+        size_type n = detail::foa::default_bucket_count,
+        const hasher& hf = hasher(), const key_equal& eql = key_equal(),
+        const allocator_type& a = allocator_type())
+          : concurrent_flat_set(n, hf, eql, a)
+      {
+        this->insert(il.begin(), il.end());
+      }
+
+      concurrent_flat_set(size_type n, const allocator_type& a)
+          : concurrent_flat_set(n, hasher(), key_equal(), a)
+      {
+      }
+
+      concurrent_flat_set(
+        size_type n, const hasher& hf, const allocator_type& a)
+          : concurrent_flat_set(n, hf, key_equal(), a)
+      {
+      }
+
+      template <typename InputIterator>
+      concurrent_flat_set(
+        InputIterator f, InputIterator l, size_type n, const allocator_type& a)
+          : concurrent_flat_set(f, l, n, hasher(), key_equal(), a)
+      {
+      }
+
+      template <typename InputIterator>
+      concurrent_flat_set(InputIterator f, InputIterator l, size_type n,
+        const hasher& hf, const allocator_type& a)
+          : concurrent_flat_set(f, l, n, hf, key_equal(), a)
+      {
+      }
+
+      concurrent_flat_set(
+        std::initializer_list<value_type> il, const allocator_type& a)
+          : concurrent_flat_set(
+              il, detail::foa::default_bucket_count, hasher(), key_equal(), a)
+      {
+      }
+
+      concurrent_flat_set(std::initializer_list<value_type> il, size_type n,
+        const allocator_type& a)
+          : concurrent_flat_set(il, n, hasher(), key_equal(), a)
+      {
+      }
+
+      concurrent_flat_set(std::initializer_list<value_type> il, size_type n,
+        const hasher& hf, const allocator_type& a)
+          : concurrent_flat_set(il, n, hf, key_equal(), a)
+      {
+      }
+
+
+      concurrent_flat_set(
+        unordered_flat_set<Key, Hash, Pred, Allocator>&& other)
+          : table_(std::move(other.table_))
+      {
+      }
+
+      ~concurrent_flat_set() = default;
+
+      concurrent_flat_set& operator=(concurrent_flat_set const& rhs)
+      {
+        table_ = rhs.table_;
+        return *this;
+      }
+
+      concurrent_flat_set& operator=(concurrent_flat_set&& rhs)
+        noexcept(boost::allocator_is_always_equal<Allocator>::type::value ||
+                 boost::allocator_propagate_on_container_move_assignment<
+                   Allocator>::type::value)
+      {
+        table_ = std::move(rhs.table_);
+        return *this;
+      }
+
+      concurrent_flat_set& operator=(std::initializer_list<value_type> ilist)
+      {
+        table_ = ilist;
+        return *this;
+      }
+
+      /// Capacity
+      ///
+
+      size_type size() const noexcept { return table_.size(); }
+      size_type max_size() const noexcept { return table_.max_size(); }
+
+      BOOST_ATTRIBUTE_NODISCARD bool empty() const noexcept
+      {
+        return size() == 0;
+      }
+
+      template <class F>
+      BOOST_FORCEINLINE size_type visit(key_type const& k, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.visit(k, f);
+      }
+
+      template <class F>
+      BOOST_FORCEINLINE size_type cvisit(key_type const& k, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.visit(k, f);
+      }
+
+      template <class K, class F>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value, size_type>::type
+      visit(K&& k, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.visit(std::forward<K>(k), f);
+      }
+
+      template <class K, class F>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value, size_type>::type
+      cvisit(K&& k, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.visit(std::forward<K>(k), f);
+      }
+
+      template<class FwdIterator, class F>
+      BOOST_FORCEINLINE
+      size_t visit(FwdIterator first, FwdIterator last, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_BULK_VISIT_ITERATOR(FwdIterator)
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.visit(first, last, f);
+      }
+
+      template<class FwdIterator, class F>
+      BOOST_FORCEINLINE
+      size_t cvisit(FwdIterator first, FwdIterator last, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_BULK_VISIT_ITERATOR(FwdIterator)
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.visit(first, last, f);
+      }
+
+      template <class F> size_type visit_all(F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.visit_all(f);
+      }
+
+      template <class F> size_type cvisit_all(F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.cvisit_all(f);
+      }
+
+#if defined(BOOST_UNORDERED_PARALLEL_ALGORITHMS)
+      template <class ExecPolicy, class F>
+      typename std::enable_if<detail::is_execution_policy<ExecPolicy>::value,
+        void>::type
+      visit_all(ExecPolicy&& p, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        BOOST_UNORDERED_STATIC_ASSERT_EXEC_POLICY(ExecPolicy)
+        table_.visit_all(p, f);
+      }
+
+      template <class ExecPolicy, class F>
+      typename std::enable_if<detail::is_execution_policy<ExecPolicy>::value,
+        void>::type
+      cvisit_all(ExecPolicy&& p, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        BOOST_UNORDERED_STATIC_ASSERT_EXEC_POLICY(ExecPolicy)
+        table_.cvisit_all(p, f);
+      }
+#endif
+
+      template <class F> bool visit_while(F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.visit_while(f);
+      }
+
+      template <class F> bool cvisit_while(F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.cvisit_while(f);
+      }
+
+#if defined(BOOST_UNORDERED_PARALLEL_ALGORITHMS)
+      template <class ExecPolicy, class F>
+      typename std::enable_if<detail::is_execution_policy<ExecPolicy>::value,
+        bool>::type
+      visit_while(ExecPolicy&& p, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        BOOST_UNORDERED_STATIC_ASSERT_EXEC_POLICY(ExecPolicy)
+        return table_.visit_while(p, f);
+      }
+
+      template <class ExecPolicy, class F>
+      typename std::enable_if<detail::is_execution_policy<ExecPolicy>::value,
+        bool>::type
+      cvisit_while(ExecPolicy&& p, F f) const
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        BOOST_UNORDERED_STATIC_ASSERT_EXEC_POLICY(ExecPolicy)
+        return table_.cvisit_while(p, f);
+      }
+#endif
+
+      /// Modifiers
+      ///
+
+      BOOST_FORCEINLINE bool insert(value_type const& obj)
+      {
+        return table_.insert(obj);
+      }
+
+      BOOST_FORCEINLINE bool insert(value_type&& obj)
+      {
+        return table_.insert(std::move(obj));
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value,
+        bool >::type
+      insert(K&& k)
+      {
+        return table_.try_emplace(std::forward<K>(k));
+      }
+
+      template <class InputIterator>
+      void insert(InputIterator begin, InputIterator end)
+      {
+        for (auto pos = begin; pos != end; ++pos) {
+          table_.emplace(*pos);
+        }
+      }
+
+      void insert(std::initializer_list<value_type> ilist)
+      {
+        this->insert(ilist.begin(), ilist.end());
+      }
+
+      template <class F>
+      BOOST_FORCEINLINE bool insert_or_visit(value_type const& obj, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.insert_or_cvisit(obj, f);
+      }
+
+      template <class F>
+      BOOST_FORCEINLINE bool insert_or_visit(value_type&& obj, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.insert_or_cvisit(std::move(obj), f);
+      }
+
+      template <class K, class F>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value,
+        bool >::type
+      insert_or_visit(K&& k, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.try_emplace_or_cvisit(std::forward<K>(k), f);
+      }
+
+      template <class InputIterator, class F>
+      void insert_or_visit(InputIterator first, InputIterator last, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        for (; first != last; ++first) {
+          table_.emplace_or_cvisit(*first, f);
+        }
+      }
+
+      template <class F>
+      void insert_or_visit(std::initializer_list<value_type> ilist, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        this->insert_or_cvisit(ilist.begin(), ilist.end(), f);
+      }
+
+      template <class F>
+      BOOST_FORCEINLINE bool insert_or_cvisit(value_type const& obj, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.insert_or_cvisit(obj, f);
+      }
+
+      template <class F>
+      BOOST_FORCEINLINE bool insert_or_cvisit(value_type&& obj, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.insert_or_cvisit(std::move(obj), f);
+      }
+
+      template <class K, class F>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value,
+        bool >::type
+      insert_or_cvisit(K&& k, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        return table_.try_emplace_or_cvisit(std::forward<K>(k), f);
+      }
+
+      template <class InputIterator, class F>
+      void insert_or_cvisit(InputIterator first, InputIterator last, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        for (; first != last; ++first) {
+          table_.emplace_or_cvisit(*first, f);
+        }
+      }
+
+      template <class F>
+      void insert_or_cvisit(std::initializer_list<value_type> ilist, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)
+        this->insert_or_cvisit(ilist.begin(), ilist.end(), f);
+      }
+
+      template <class... Args> BOOST_FORCEINLINE bool emplace(Args&&... args)
+      {
+        return table_.emplace(std::forward<Args>(args)...);
+      }
+
+      template <class Arg, class... Args>
+      BOOST_FORCEINLINE bool emplace_or_visit(Arg&& arg, Args&&... args)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_LAST_ARG_CONST_INVOCABLE(Arg, Args...)
+        return table_.emplace_or_cvisit(
+          std::forward<Arg>(arg), std::forward<Args>(args)...);
+      }
+
+      template <class Arg, class... Args>
+      BOOST_FORCEINLINE bool emplace_or_cvisit(Arg&& arg, Args&&... args)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_LAST_ARG_CONST_INVOCABLE(Arg, Args...)
+        return table_.emplace_or_cvisit(
+          std::forward<Arg>(arg), std::forward<Args>(args)...);
+      }
+
+      BOOST_FORCEINLINE size_type erase(key_type const& k)
+      {
+        return table_.erase(k);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value, size_type>::type
+      erase(K&& k)
+      {
+        return table_.erase(std::forward<K>(k));
+      }
+
+      template <class F>
+      BOOST_FORCEINLINE size_type erase_if(key_type const& k, F f)
+      {
+        return table_.erase_if(k, f);
+      }
+
+      template <class K, class F>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value &&
+          !detail::is_execution_policy<K>::value,
+        size_type>::type
+      erase_if(K&& k, F f)
+      {
+        return table_.erase_if(std::forward<K>(k), f);
+      }
+
+#if defined(BOOST_UNORDERED_PARALLEL_ALGORITHMS)
+      template <class ExecPolicy, class F>
+      typename std::enable_if<detail::is_execution_policy<ExecPolicy>::value,
+        void>::type
+      erase_if(ExecPolicy&& p, F f)
+      {
+        BOOST_UNORDERED_STATIC_ASSERT_EXEC_POLICY(ExecPolicy)
+        table_.erase_if(p, f);
+      }
+#endif
+
+      template <class F> size_type erase_if(F f) { return table_.erase_if(f); }
+
+      void swap(concurrent_flat_set& other) noexcept(
+        boost::allocator_is_always_equal<Allocator>::type::value ||
+        boost::allocator_propagate_on_container_swap<Allocator>::type::value)
+      {
+        return table_.swap(other.table_);
+      }
+
+      void clear() noexcept { table_.clear(); }
+
+      template <typename H2, typename P2>
+      size_type merge(concurrent_flat_set<Key, H2, P2, Allocator>& x)
+      {
+        BOOST_ASSERT(get_allocator() == x.get_allocator());
+        return table_.merge(x.table_);
+      }
+
+      template <typename H2, typename P2>
+      size_type merge(concurrent_flat_set<Key, H2, P2, Allocator>&& x)
+      {
+        return merge(x);
+      }
+
+      BOOST_FORCEINLINE size_type count(key_type const& k) const
+      {
+        return table_.count(k);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value, size_type>::type
+      count(K const& k)
+      {
+        return table_.count(k);
+      }
+
+      BOOST_FORCEINLINE bool contains(key_type const& k) const
+      {
+        return table_.contains(k);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value, bool>::type
+      contains(K const& k) const
+      {
+        return table_.contains(k);
+      }
+
+      /// Hash Policy
+      ///
+      size_type bucket_count() const noexcept { return table_.capacity(); }
+
+      float load_factor() const noexcept { return table_.load_factor(); }
+      float max_load_factor() const noexcept
+      {
+        return table_.max_load_factor();
+      }
+      void max_load_factor(float) {}
+      size_type max_load() const noexcept { return table_.max_load(); }
+
+      void rehash(size_type n) { table_.rehash(n); }
+      void reserve(size_type n) { table_.reserve(n); }
+
+      /// Observers
+      ///
+      allocator_type get_allocator() const noexcept
+      {
+        return table_.get_allocator();
+      }
+
+      hasher hash_function() const { return table_.hash_function(); }
+      key_equal key_eq() const { return table_.key_eq(); }
+    };
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    bool operator==(
+      concurrent_flat_set<Key, Hash, KeyEqual, Allocator> const& lhs,
+      concurrent_flat_set<Key, Hash, KeyEqual, Allocator> const& rhs)
+    {
+      return lhs.table_ == rhs.table_;
+    }
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    bool operator!=(
+      concurrent_flat_set<Key, Hash, KeyEqual, Allocator> const& lhs,
+      concurrent_flat_set<Key, Hash, KeyEqual, Allocator> const& rhs)
+    {
+      return !(lhs == rhs);
+    }
+
+    template <class Key, class Hash, class Pred, class Alloc>
+    void swap(concurrent_flat_set<Key, Hash, Pred, Alloc>& x,
+      concurrent_flat_set<Key, Hash, Pred, Alloc>& y)
+      noexcept(noexcept(x.swap(y)))
+    {
+      x.swap(y);
+    }
+
+    template <class K, class H, class P, class A, class Predicate>
+    typename concurrent_flat_set<K, H, P, A>::size_type erase_if(
+      concurrent_flat_set<K, H, P, A>& c, Predicate pred)
+    {
+      return c.table_.erase_if(pred);
+    }
+
+    template<class Archive, class K, class H, class KE, class A>
+    void serialize(
+      Archive& ar, concurrent_flat_set<K, H, KE, A>& c, unsigned int)
+    {
+      ar & core::make_nvp("table",c.table_);
+    }
+
+#if BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
+
+    template <class InputIterator,
+      class Hash =
+        boost::hash<typename std::iterator_traits<InputIterator>::value_type>,
+      class Pred =
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+      class Allocator = std::allocator<
+        typename std::iterator_traits<InputIterator>::value_type>,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_set(InputIterator, InputIterator,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> concurrent_flat_set<
+        typename std::iterator_traits<InputIterator>::value_type, Hash, Pred,
+        Allocator>;
+
+    template <class T, class Hash = boost::hash<T>,
+      class Pred = std::equal_to<T>, class Allocator = std::allocator<T>,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_set(std::initializer_list<T>,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> concurrent_flat_set< T, Hash, Pred, Allocator>;
+
+    template <class InputIterator, class Allocator,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_set(InputIterator, InputIterator, std::size_t, Allocator)
+      -> concurrent_flat_set<
+        typename std::iterator_traits<InputIterator>::value_type,
+        boost::hash<typename std::iterator_traits<InputIterator>::value_type>,
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+        Allocator>;
+
+    template <class InputIterator, class Allocator,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_set(InputIterator, InputIterator, Allocator)
+      -> concurrent_flat_set<
+        typename std::iterator_traits<InputIterator>::value_type,
+        boost::hash<typename std::iterator_traits<InputIterator>::value_type>,
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+        Allocator>;
+
+    template <class InputIterator, class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_set(
+      InputIterator, InputIterator, std::size_t, Hash, Allocator)
+      -> concurrent_flat_set<
+        typename std::iterator_traits<InputIterator>::value_type, Hash,
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+        Allocator>;
+
+    template <class T, class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_set(std::initializer_list<T>, std::size_t, Allocator)
+      -> concurrent_flat_set<T, boost::hash<T>,std::equal_to<T>, Allocator>;
+
+    template <class T, class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_set(std::initializer_list<T >, Allocator)
+      -> concurrent_flat_set<T, boost::hash<T>, std::equal_to<T>, Allocator>;
+
+    template <class T, class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    concurrent_flat_set(std::initializer_list<T >, std::size_t,Hash, Allocator)
+      -> concurrent_flat_set<T, Hash, std::equal_to<T>, Allocator>;
+
+#endif
+
+  } // namespace unordered
+} // namespace boost
+
+#endif // BOOST_UNORDERED_CONCURRENT_FLAT_SET_HPP

thirdparty/include/boost/unordered/concurrent_flat_set_fwd.hpp

@@ -0,0 +1,52 @@
+/* Fast open-addressing concurrent hashset.
+ *
+ * Copyright 2023 Christian Mazakas.
+ * Copyright 2023 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_CONCURRENT_FLAT_SET_FWD_HPP
+#define BOOST_UNORDERED_CONCURRENT_FLAT_SET_FWD_HPP
+
+#include <boost/container_hash/hash_fwd.hpp>
+
+#include <functional>
+#include <memory>
+
+namespace boost {
+  namespace unordered {
+
+    template <class Key, class Hash = boost::hash<Key>,
+      class Pred = std::equal_to<Key>,
+      class Allocator = std::allocator<Key> >
+    class concurrent_flat_set;
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    bool operator==(
+      concurrent_flat_set<Key, Hash, KeyEqual, Allocator> const& lhs,
+      concurrent_flat_set<Key, Hash, KeyEqual, Allocator> const& rhs);
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    bool operator!=(
+      concurrent_flat_set<Key, Hash, KeyEqual, Allocator> const& lhs,
+      concurrent_flat_set<Key, Hash, KeyEqual, Allocator> const& rhs);
+
+    template <class Key, class Hash, class Pred, class Alloc>
+    void swap(concurrent_flat_set<Key, Hash, Pred, Alloc>& x,
+      concurrent_flat_set<Key, Hash, Pred, Alloc>& y)
+      noexcept(noexcept(x.swap(y)));
+
+    template <class K, class H, class P, class A, class Predicate>
+    typename concurrent_flat_set<K, H, P, A>::size_type erase_if(
+      concurrent_flat_set<K, H, P, A>& c, Predicate pred);
+
+  } // namespace unordered
+
+  using boost::unordered::concurrent_flat_set;
+} // namespace boost
+
+#endif // BOOST_UNORDERED_CONCURRENT_FLAT_SET_FWD_HPP

thirdparty/include/boost/unordered/detail/archive_constructed.hpp

@@ -0,0 +1,71 @@
+/* Copyright 2023 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_DETAIL_ARCHIVE_CONSTRUCTED_HPP
+#define BOOST_UNORDERED_DETAIL_ARCHIVE_CONSTRUCTED_HPP
+
+#include <boost/unordered/detail/opt_storage.hpp>
+
+#include <boost/config.hpp>
+#include <boost/core/no_exceptions_support.hpp>
+#include <boost/core/noncopyable.hpp>
+#include <boost/core/serialization.hpp>
+
+namespace boost{
+namespace unordered{
+namespace detail{
+
+/* constructs a stack-based object from a serialization archive */
+
+template<typename T>
+struct archive_constructed:private noncopyable
+{
+  template<class Archive>
+  archive_constructed(const char* name,Archive& ar,unsigned int version)
+  {
+    core::load_construct_data_adl(ar,std::addressof(get()),version);
+    BOOST_TRY{
+      ar>>core::make_nvp(name,get());
+    }
+    BOOST_CATCH(...){
+      get().~T();
+      BOOST_RETHROW;
+    }
+    BOOST_CATCH_END
+  }
+
+  ~archive_constructed()
+  {
+    get().~T();
+  }
+
+#if defined(BOOST_GCC)&&(BOOST_GCC>=4*10000+6*100)
+#define BOOST_UNORDERED_IGNORE_WSTRICT_ALIASING
+#endif
+
+#if defined(BOOST_UNORDERED_IGNORE_WSTRICT_ALIASING)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif
+
+  T& get(){return *space.address();}
+
+#if defined(BOOST_UNORDERED_IGNORE_WSTRICT_ALIASING)
+#pragma GCC diagnostic pop
+#undef BOOST_UNORDERED_IGNORE_WSTRICT_ALIASING
+#endif
+
+private:
+  opt_storage<T> space;
+};
+
+} /* namespace detail */
+} /* namespace unordered */
+} /* namespace boost */
+
+#endif

thirdparty/include/boost/unordered/detail/bad_archive_exception.hpp

@@ -0,0 +1,27 @@
+/* Copyright 2023 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_DETAIL_BAD_ARCHIVE_EXCEPTION_HPP
+#define BOOST_UNORDERED_DETAIL_BAD_ARCHIVE_EXCEPTION_HPP
+
+#include <stdexcept>
+
+namespace boost{
+namespace unordered{
+namespace detail{
+
+struct bad_archive_exception:std::runtime_error
+{
+  bad_archive_exception():std::runtime_error("Invalid or corrupted archive"){}
+};
+
+} /* namespace detail */
+} /* namespace unordered */
+} /* namespace boost */
+
+#endif

thirdparty/include/boost/unordered/detail/concurrent_static_asserts.hpp

@@ -0,0 +1,105 @@
+/* Copyright 2023 Christian Mazakas.
+ * Copyright 2023 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_DETAIL_CONCURRENT_STATIC_ASSERTS_HPP
+#define BOOST_UNORDERED_DETAIL_CONCURRENT_STATIC_ASSERTS_HPP
+
+#include <boost/config.hpp>
+#include <boost/mp11/algorithm.hpp>
+#include <boost/mp11/list.hpp>
+
+#include <functional>
+#include <iterator>
+#include <type_traits>
+
+#define BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(F)                             \
+  static_assert(boost::unordered::detail::is_invocable<F, value_type&>::value, \
+    "The provided Callable must be invocable with value_type&");
+
+#define BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(F)                       \
+  static_assert(                                                               \
+    boost::unordered::detail::is_invocable<F, value_type const&>::value,       \
+    "The provided Callable must be invocable with value_type const&");
+
+#if BOOST_CXX_VERSION >= 202002L
+
+#define BOOST_UNORDERED_STATIC_ASSERT_EXEC_POLICY(P)                           \
+  static_assert(!std::is_base_of<std::execution::parallel_unsequenced_policy,  \
+                  ExecPolicy>::value,                                          \
+    "ExecPolicy must be sequenced.");                                          \
+  static_assert(                                                               \
+    !std::is_base_of<std::execution::unsequenced_policy, ExecPolicy>::value,   \
+    "ExecPolicy must be sequenced.");
+
+#else
+
+#define BOOST_UNORDERED_STATIC_ASSERT_EXEC_POLICY(P)                           \
+  static_assert(!std::is_base_of<std::execution::parallel_unsequenced_policy,  \
+                  ExecPolicy>::value,                                          \
+    "ExecPolicy must be sequenced.");
+#endif
+
+#define BOOST_UNORDERED_DETAIL_COMMA ,
+
+#define BOOST_UNORDERED_DETAIL_LAST_ARG(Arg, Args)                             \
+  mp11::mp_back<mp11::mp_list<Arg BOOST_UNORDERED_DETAIL_COMMA Args> >
+
+#define BOOST_UNORDERED_STATIC_ASSERT_LAST_ARG_INVOCABLE(Arg, Args)            \
+  BOOST_UNORDERED_STATIC_ASSERT_INVOCABLE(                                     \
+    BOOST_UNORDERED_DETAIL_LAST_ARG(Arg, Args))
+
+#define BOOST_UNORDERED_STATIC_ASSERT_LAST_ARG_CONST_INVOCABLE(Arg, Args)      \
+  BOOST_UNORDERED_STATIC_ASSERT_CONST_INVOCABLE(                               \
+    BOOST_UNORDERED_DETAIL_LAST_ARG(Arg, Args))
+
+namespace boost {
+  namespace unordered {
+    namespace detail {
+      template <class F, class... Args>
+      struct is_invocable
+          : std::is_constructible<std::function<void(Args...)>,
+              std::reference_wrapper<typename std::remove_reference<F>::type> >
+      {
+      };
+
+    } // namespace detail
+
+  } // namespace unordered
+
+} // namespace boost
+
+#if defined(BOOST_NO_CXX20_HDR_CONCEPTS)
+#define BOOST_UNORDERED_STATIC_ASSERT_FWD_ITERATOR(Iterator)                   \
+  static_assert(                                                               \
+    std::is_base_of<                                                           \
+      std::forward_iterator_tag,                                               \
+      typename std::iterator_traits<Iterator>::iterator_category>::value,      \
+    "The provided iterator must be at least forward");
+#else
+#define BOOST_UNORDERED_STATIC_ASSERT_FWD_ITERATOR(Iterator)                   \
+  static_assert(std::forward_iterator<Iterator>,                               \
+    "The provided iterator must be at least forward");
+
+#endif
+
+#define BOOST_UNORDERED_STATIC_ASSERT_KEY_COMPATIBLE_ITERATOR(Iterator)        \
+  static_assert(                                                               \
+    std::is_same<                                                              \
+      typename std::iterator_traits<Iterator>::value_type,                     \
+      key_type>::value ||                                                      \
+    detail::are_transparent<                                                   \
+      typename std::iterator_traits<Iterator>::value_type,                     \
+      hasher, key_equal>::value,                                               \
+    "The provided iterator must dereference to a compatible key value");
+
+#define BOOST_UNORDERED_STATIC_ASSERT_BULK_VISIT_ITERATOR(Iterator)            \
+  BOOST_UNORDERED_STATIC_ASSERT_FWD_ITERATOR(Iterator)                         \
+  BOOST_UNORDERED_STATIC_ASSERT_KEY_COMPATIBLE_ITERATOR(Iterator)
+
+#endif // BOOST_UNORDERED_DETAIL_CONCURRENT_STATIC_ASSERTS_HPP

thirdparty/include/boost/unordered/detail/fca.hpp

@@ -0,0 +1,878 @@
+// Copyright (C) 2022-2023 Joaquin M Lopez Munoz.
+// Copyright (C) 2022 Christian Mazakas
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_DETAIL_FCA_HPP
+#define BOOST_UNORDERED_DETAIL_FCA_HPP
+
+/*
+
+The general structure of the fast closed addressing implementation is that we
+use straight-forward separate chaining (i.e. each bucket contains its own linked
+list) and then improve iteration time by adding an array of "bucket groups".
+
+A bucket group is a constant-width view into a subsection of the buckets array,
+containing a bitmask that indicates which one of the buckets in the subsection
+contains a list of nodes. This allows the code to test N buckets for occupancy
+in a single operation. Additional speed can be found by inter-linking occupied
+bucket groups with one another in a doubly-linked list. To this end, large
+swathes of the bucket groups array no longer need to be iterated and have their
+bitmasks examined for occupancy.
+
+A bucket group iterator contains a pointer to a bucket group along with a
+pointer into the buckets array. The iterator's bucket pointer is guaranteed to
+point to a bucket within the bucket group's view of the array. To advance the
+iterator, we need to determine if we need to skip to the next bucket group or
+simply move to the next occupied bucket as denoted by the bitmask.
+
+To accomplish this, we perform something roughly equivalent to this:
+```
+bucket_iterator itb = ...
+bucket_pointer p = itb.p
+bucket_group_pointer pbg = itb.pbg
+
+offset = p - pbg->buckets
+// because we wish to see if the _next_ bit in the mask is occupied, we'll
+// generate a testing mask from the current offset + 1
+//
+testing_mask = reset_first_bits(offset + 1)
+n = ctz(pbg->bitmask & testing_mask)
+
+if (n < N) {
+  p = pbg->buckets + n
+} else {
+  pbg = pbg->next
+  p = pbg->buckets + ctz(pbg->bitmask)
+}
+```
+
+`reset_first_bits` yields an unsigned integral with the first n bits set to 0
+and then by counting the number of trailing zeroes when AND'd against the bucket
+group's bitmask, we can derive the offset into the buckets array. When the
+calculated offset is equal to N, we know we've reached the end of a bucket group
+and we can advance to the next one.
+
+This is a rough explanation for how iterator incrementation should work for a
+fixed width size of N as 3 for the bucket groups
+```
+N = 3
+p = buckets
+pbg->bitmask = 0b101
+pbg->buckets = buckets
+
+offset = p - pbg->buckets // => 0
+testing_mask = reset_first_bits(offset + 1) // reset_first_bits(1) => 0b110
+
+x = bitmask & testing_mask // => 0b101 & 0b110 => 0b100
+ctz(x) // ctz(0b100) => 2
+// 2 < 3
+=> p = pbg->buckets + 2
+
+// increment again...
+offset = p - pbg->buckets // => 2
+testing_mask = reset_first_bits(offset + 1) // reset_first_bits(3) => 0b000
+
+bitmask & testing_mask // 0b101 & 0b000 => 0b000
+ctz(0b000) => 3
+// 3 < 3 is false now
+pbg = pbg->next
+initial_offset = ctz(pbg->bitmask)
+p = pbg->buckets + initial_offset
+```
+
+For `size_` number of buckets, there are `1 + (size_ / N)` bucket groups where
+`N` is the width of a bucket group, determined at compile-time.
+
+We allocate space for `size_ + 1` buckets, using the last one as a dummy bucket
+which is kept permanently empty so it can act as a sentinel value in the
+implementation of `iterator end();`. We set the last bucket group to act as a
+sentinel.
+
+```
+num_groups = size_ / N + 1
+groups = allocate(num_groups)
+pbg = groups + (num_groups - 1)
+
+// not guaranteed to point to exactly N buckets
+pbg->buckets = buckets + N * (size_ / N)
+
+// this marks the true end of the bucket array
+buckets pbg->bitmask = set_bit(size_ % N)
+
+// links in on itself
+pbg->next = pbg->prev = pbg
+```
+
+To this end, we can devise a safe iteration scheme while also creating a useful
+sentinel to use as the end iterator.
+
+Otherwise, usage of the data structure is relatively straight-forward compared
+to normal separate chaining implementations.
+
+*/
+
+#include <boost/unordered/detail/prime_fmod.hpp>
+#include <boost/unordered/detail/serialize_tracked_address.hpp>
+#include <boost/unordered/detail/opt_storage.hpp>
+
+#include <boost/assert.hpp>
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/bit.hpp>
+#include <boost/core/empty_value.hpp>
+#include <boost/core/invoke_swap.hpp>
+#include <boost/core/no_exceptions_support.hpp>
+#include <boost/core/serialization.hpp>
+#include <boost/cstdint.hpp>
+
+#include <boost/config.hpp>
+
+#include <iterator>
+
+namespace boost {
+  namespace unordered {
+    namespace detail {
+
+      template <class ValueType, class VoidPtr> struct node
+      {
+        typedef ValueType value_type;
+        typedef typename boost::pointer_traits<VoidPtr>::template rebind_to<
+          node>::type node_pointer;
+
+        node_pointer next;
+        opt_storage<value_type> buf;
+
+        node() noexcept : next(), buf() {}
+
+        value_type* value_ptr() noexcept
+        {
+          return buf.address();
+        }
+
+        value_type& value() noexcept
+        {
+          return *buf.address();
+        }
+      };
+
+      template <class Node, class VoidPtr> struct bucket
+      {
+        typedef typename boost::pointer_traits<VoidPtr>::template rebind_to<
+          Node>::type node_pointer;
+
+        typedef typename boost::pointer_traits<VoidPtr>::template rebind_to<
+          bucket>::type bucket_pointer;
+
+        node_pointer next;
+
+        bucket() noexcept : next() {}
+      };
+
+      template <class Bucket> struct bucket_group
+      {
+        typedef typename Bucket::bucket_pointer bucket_pointer;
+        typedef
+          typename boost::pointer_traits<bucket_pointer>::template rebind_to<
+            bucket_group>::type bucket_group_pointer;
+
+        BOOST_STATIC_CONSTANT(std::size_t, N = sizeof(std::size_t) * CHAR_BIT);
+
+        bucket_pointer buckets;
+        std::size_t bitmask;
+        bucket_group_pointer next, prev;
+
+        bucket_group() noexcept : buckets(), bitmask(0), next(), prev() {}
+        ~bucket_group() {}
+      };
+
+      inline std::size_t set_bit(std::size_t n) { return std::size_t(1) << n; }
+
+      inline std::size_t reset_bit(std::size_t n)
+      {
+        return ~(std::size_t(1) << n);
+      }
+
+      inline std::size_t reset_first_bits(std::size_t n) // n>0
+      {
+        return ~(~(std::size_t(0)) >> (sizeof(std::size_t) * 8 - n));
+      }
+
+      template <class Bucket> struct grouped_bucket_iterator
+      {
+      public:
+        typedef typename Bucket::bucket_pointer bucket_pointer;
+        typedef
+          typename boost::pointer_traits<bucket_pointer>::template rebind_to<
+            bucket_group<Bucket> >::type bucket_group_pointer;
+
+        typedef Bucket value_type;
+        typedef typename boost::pointer_traits<bucket_pointer>::difference_type
+          difference_type;
+        typedef Bucket& reference;
+        typedef Bucket* pointer;
+        typedef std::forward_iterator_tag iterator_category;
+
+      private:
+        bucket_pointer p;
+        bucket_group_pointer pbg;
+
+      public:
+        grouped_bucket_iterator() : p(), pbg() {}
+
+        reference operator*() const noexcept { return dereference(); }
+        pointer operator->() const noexcept { return boost::to_address(p); }
+
+        grouped_bucket_iterator& operator++() noexcept
+        {
+          increment();
+          return *this;
+        }
+
+        grouped_bucket_iterator operator++(int) noexcept
+        {
+          grouped_bucket_iterator old = *this;
+          increment();
+          return old;
+        }
+
+        bool operator==(grouped_bucket_iterator const& other) const noexcept
+        {
+          return equal(other);
+        }
+
+        bool operator!=(grouped_bucket_iterator const& other) const noexcept
+        {
+          return !equal(other);
+        }
+
+      private:
+        template <typename, typename, typename>
+        friend class grouped_bucket_array;
+
+        BOOST_STATIC_CONSTANT(std::size_t, N = bucket_group<Bucket>::N);
+
+        grouped_bucket_iterator(bucket_pointer p_, bucket_group_pointer pbg_)
+            : p(p_), pbg(pbg_)
+        {
+        }
+
+        Bucket& dereference() const noexcept { return *p; }
+
+        bool equal(const grouped_bucket_iterator& x) const noexcept
+        {
+          return p == x.p;
+        }
+
+        void increment() noexcept
+        {
+          std::size_t const offset = static_cast<std::size_t>(p - pbg->buckets);
+
+          std::size_t n = std::size_t(boost::core::countr_zero(
+            pbg->bitmask & reset_first_bits(offset + 1)));
+
+          if (n < N) {
+            p = pbg->buckets + static_cast<difference_type>(n);
+          } else {
+            pbg = pbg->next;
+
+            std::ptrdiff_t x = boost::core::countr_zero(pbg->bitmask);
+            p = pbg->buckets + x;
+          }
+        }
+
+        template <typename Archive>
+        friend void serialization_track(
+          Archive& ar, grouped_bucket_iterator const& x)
+        {
+          // requires: not at end() position
+          track_address(ar, x.p);
+          track_address(ar, x.pbg);
+        }
+
+        friend class boost::serialization::access;
+
+        template <typename Archive> void serialize(Archive& ar, unsigned int)
+        {
+          // requires: not at end() position
+          serialize_tracked_address(ar, p);
+          serialize_tracked_address(ar, pbg);
+        }
+      };
+
+      template <class Node> struct const_grouped_local_bucket_iterator;
+
+      template <class Node> struct grouped_local_bucket_iterator
+      {
+        typedef typename Node::node_pointer node_pointer;
+
+      public:
+        typedef typename Node::value_type value_type;
+        typedef value_type element_type;
+        typedef value_type* pointer;
+        typedef value_type& reference;
+        typedef std::ptrdiff_t difference_type;
+        typedef std::forward_iterator_tag iterator_category;
+
+        grouped_local_bucket_iterator() : p() {}
+
+        reference operator*() const noexcept { return dereference(); }
+
+        pointer operator->() const noexcept
+        {
+          return std::addressof(dereference());
+        }
+
+        grouped_local_bucket_iterator& operator++() noexcept
+        {
+          increment();
+          return *this;
+        }
+
+        grouped_local_bucket_iterator operator++(int) noexcept
+        {
+          grouped_local_bucket_iterator old = *this;
+          increment();
+          return old;
+        }
+
+        bool operator==(
+          grouped_local_bucket_iterator const& other) const noexcept
+        {
+          return equal(other);
+        }
+
+        bool operator!=(
+          grouped_local_bucket_iterator const& other) const noexcept
+        {
+          return !equal(other);
+        }
+
+      private:
+        template <typename, typename, typename>
+        friend class grouped_bucket_array;
+
+        template <class> friend struct const_grouped_local_bucket_iterator;
+
+        grouped_local_bucket_iterator(node_pointer p_) : p(p_) {}
+
+        value_type& dereference() const noexcept { return p->value(); }
+
+        bool equal(const grouped_local_bucket_iterator& x) const noexcept
+        {
+          return p == x.p;
+        }
+
+        void increment() noexcept { p = p->next; }
+
+        node_pointer p;
+      };
+
+      template <class Node> struct const_grouped_local_bucket_iterator
+      {
+        typedef typename Node::node_pointer node_pointer;
+
+      public:
+        typedef typename Node::value_type const value_type;
+        typedef value_type const element_type;
+        typedef value_type const* pointer;
+        typedef value_type const& reference;
+        typedef std::ptrdiff_t difference_type;
+        typedef std::forward_iterator_tag iterator_category;
+
+        const_grouped_local_bucket_iterator() : p() {}
+        const_grouped_local_bucket_iterator(
+          grouped_local_bucket_iterator<Node> it)
+            : p(it.p)
+        {
+        }
+
+        reference operator*() const noexcept { return dereference(); }
+
+        pointer operator->() const noexcept
+        {
+          return std::addressof(dereference());
+        }
+
+        const_grouped_local_bucket_iterator& operator++() noexcept
+        {
+          increment();
+          return *this;
+        }
+
+        const_grouped_local_bucket_iterator operator++(int) noexcept
+        {
+          const_grouped_local_bucket_iterator old = *this;
+          increment();
+          return old;
+        }
+
+        bool operator==(
+          const_grouped_local_bucket_iterator const& other) const noexcept
+        {
+          return equal(other);
+        }
+
+        bool operator!=(
+          const_grouped_local_bucket_iterator const& other) const noexcept
+        {
+          return !equal(other);
+        }
+
+      private:
+        template <typename, typename, typename>
+        friend class grouped_bucket_array;
+
+        const_grouped_local_bucket_iterator(node_pointer p_) : p(p_) {}
+
+        value_type& dereference() const noexcept { return p->value(); }
+
+        bool equal(const const_grouped_local_bucket_iterator& x) const noexcept
+        {
+          return p == x.p;
+        }
+
+        void increment() noexcept { p = p->next; }
+
+        node_pointer p;
+      };
+
+      template <class T> struct span
+      {
+        T* begin() const noexcept { return data; }
+        T* end() const noexcept { return data + size; }
+
+        T* data;
+        std::size_t size;
+
+        span(T* data_, std::size_t size_) : data(data_), size(size_) {}
+      };
+
+      template <class Bucket, class Allocator, class SizePolicy>
+      class grouped_bucket_array
+          : boost::empty_value<typename boost::allocator_rebind<Allocator,
+              node<typename boost::allocator_value_type<Allocator>::type,
+                typename boost::allocator_void_pointer<Allocator>::type> >::
+                type>
+      {
+        typedef typename boost::allocator_value_type<Allocator>::type
+          allocator_value_type;
+        typedef
+          typename boost::allocator_void_pointer<Allocator>::type void_pointer;
+        typedef typename boost::allocator_difference_type<Allocator>::type
+          difference_type;
+
+      public:
+        typedef typename boost::allocator_rebind<Allocator,
+          node<allocator_value_type, void_pointer> >::type node_allocator_type;
+
+        typedef node<allocator_value_type, void_pointer> node_type;
+        typedef typename boost::allocator_pointer<node_allocator_type>::type
+          node_pointer;
+        typedef SizePolicy size_policy;
+
+      private:
+        typedef typename boost::allocator_rebind<Allocator, Bucket>::type
+          bucket_allocator_type;
+        typedef typename boost::allocator_pointer<bucket_allocator_type>::type
+          bucket_pointer;
+        typedef boost::pointer_traits<bucket_pointer> bucket_pointer_traits;
+
+        typedef bucket_group<Bucket> group;
+        typedef typename boost::allocator_rebind<Allocator, group>::type
+          group_allocator_type;
+        typedef typename boost::allocator_pointer<group_allocator_type>::type
+          group_pointer;
+        typedef typename boost::pointer_traits<group_pointer>
+          group_pointer_traits;
+
+      public:
+        typedef Bucket value_type;
+        typedef Bucket bucket_type;
+        typedef std::size_t size_type;
+        typedef Allocator allocator_type;
+        typedef grouped_bucket_iterator<Bucket> iterator;
+        typedef grouped_local_bucket_iterator<node_type> local_iterator;
+        typedef const_grouped_local_bucket_iterator<node_type>
+          const_local_iterator;
+
+      private:
+        std::size_t size_index_, size_;
+        bucket_pointer buckets;
+        group_pointer groups;
+
+      public:
+        static std::size_t bucket_count_for(std::size_t num_buckets)
+        {
+          if (num_buckets == 0) {
+            return 0;
+          }
+          return size_policy::size(size_policy::size_index(num_buckets));
+        }
+
+        grouped_bucket_array()
+            : empty_value<node_allocator_type>(
+                empty_init_t(), node_allocator_type()),
+              size_index_(0), size_(0), buckets(), groups()
+        {
+        }
+
+        grouped_bucket_array(size_type n, const Allocator& al)
+            : empty_value<node_allocator_type>(empty_init_t(), al),
+              size_index_(0), size_(0), buckets(), groups()
+        {
+          if (n == 0) {
+            return;
+          }
+
+          size_index_ = size_policy::size_index(n);
+          size_ = size_policy::size(size_index_);
+
+          bucket_allocator_type bucket_alloc = this->get_bucket_allocator();
+          group_allocator_type group_alloc = this->get_group_allocator();
+
+          size_type const num_buckets = buckets_len();
+          size_type const num_groups = groups_len();
+
+          buckets = boost::allocator_allocate(bucket_alloc, num_buckets);
+          BOOST_TRY
+          {
+            groups = boost::allocator_allocate(group_alloc, num_groups);
+
+            bucket_type* pb = boost::to_address(buckets);
+            for (size_type i = 0; i < num_buckets; ++i) {
+              new (pb + i) bucket_type();
+            }
+
+            group* pg = boost::to_address(groups);
+            for (size_type i = 0; i < num_groups; ++i) {
+              new (pg + i) group();
+            }
+          }
+          BOOST_CATCH(...)
+          {
+            boost::allocator_deallocate(bucket_alloc, buckets, num_buckets);
+            BOOST_RETHROW
+          }
+          BOOST_CATCH_END
+
+          size_type const N = group::N;
+          group_pointer pbg =
+            groups + static_cast<difference_type>(num_groups - 1);
+
+          pbg->buckets =
+            buckets + static_cast<difference_type>(N * (size_ / N));
+          pbg->bitmask = set_bit(size_ % N);
+          pbg->next = pbg->prev = pbg;
+        }
+
+        ~grouped_bucket_array() { this->deallocate(); }
+
+        grouped_bucket_array(grouped_bucket_array const&) = delete;
+        grouped_bucket_array& operator=(grouped_bucket_array const&) = delete;
+
+        grouped_bucket_array(grouped_bucket_array&& other) noexcept
+            : empty_value<node_allocator_type>(
+                empty_init_t(), other.get_node_allocator()),
+              size_index_(other.size_index_),
+              size_(other.size_),
+              buckets(other.buckets),
+              groups(other.groups)
+        {
+          other.size_ = 0;
+          other.size_index_ = 0;
+          other.buckets = bucket_pointer();
+          other.groups = group_pointer();
+        }
+
+        grouped_bucket_array& operator=(grouped_bucket_array&& other) noexcept
+        {
+          BOOST_ASSERT(
+            this->get_node_allocator() == other.get_node_allocator());
+
+          if (this == std::addressof(other)) {
+            return *this;
+          }
+
+          this->deallocate();
+          size_index_ = other.size_index_;
+          size_ = other.size_;
+
+          buckets = other.buckets;
+          groups = other.groups;
+
+          other.size_index_ = 0;
+          other.size_ = 0;
+          other.buckets = bucket_pointer();
+          other.groups = group_pointer();
+
+          return *this;
+        }
+
+#if defined(BOOST_MSVC)
+#pragma warning(push)
+#pragma warning(disable : 4100) // unreferenced formal parameter (dtor calls)
+#endif
+
+        void deallocate() noexcept
+        {
+          if (buckets) {
+            size_type const num_buckets = buckets_len();
+            bucket_type* pb = boost::to_address(buckets);
+            (void)pb; // VS complains when dtor is trivial
+
+            for (size_type i = 0; i < num_buckets; ++i) {
+              (pb + i)->~bucket_type();
+            }
+
+            bucket_allocator_type bucket_alloc = this->get_bucket_allocator();
+            boost::allocator_deallocate(bucket_alloc, buckets, num_buckets);
+
+            buckets = bucket_pointer();
+          }
+
+          if (groups) {
+            size_type const num_groups = groups_len();
+            group* pg = boost::to_address(groups);
+            (void)pg; // VS complains when dtor is trivial
+
+            for (size_type i = 0; i < num_groups; ++i) {
+              (pg + i)->~group();
+            }
+
+            group_allocator_type group_alloc = this->get_group_allocator();
+            boost::allocator_deallocate(group_alloc, groups, num_groups);
+
+            groups = group_pointer();
+          }
+        }
+
+#if defined(BOOST_MSVC)
+#pragma warning(pop)
+#endif
+
+        void swap(grouped_bucket_array& other)
+        {
+          std::swap(size_index_, other.size_index_);
+          std::swap(size_, other.size_);
+          std::swap(buckets, other.buckets);
+          std::swap(groups, other.groups);
+
+          bool b = boost::allocator_propagate_on_container_swap<
+            allocator_type>::type::value;
+          if (b) {
+            boost::core::invoke_swap(
+              get_node_allocator(), other.get_node_allocator());
+          }
+        }
+
+        node_allocator_type const& get_node_allocator() const
+        {
+          return empty_value<node_allocator_type>::get();
+        }
+
+        node_allocator_type& get_node_allocator()
+        {
+          return empty_value<node_allocator_type>::get();
+        }
+
+        bucket_allocator_type get_bucket_allocator() const
+        {
+          return this->get_node_allocator();
+        }
+
+        group_allocator_type get_group_allocator() const
+        {
+          return this->get_node_allocator();
+        }
+
+        size_type buckets_len() const noexcept { return size_ + 1; }
+
+        size_type groups_len() const noexcept { return size_ / group::N + 1; }
+
+        void reset_allocator(Allocator const& allocator_)
+        {
+          this->get_node_allocator() = node_allocator_type(allocator_);
+        }
+
+        size_type bucket_count() const { return size_; }
+
+        iterator begin() const { return size_ == 0 ? end() : ++at(size_); }
+
+        iterator end() const
+        {
+          // micro optimization: no need to return the bucket group
+          // as end() is not incrementable
+          iterator pbg;
+          pbg.p =
+            buckets + static_cast<difference_type>(this->buckets_len() - 1);
+          return pbg;
+        }
+
+        local_iterator begin(size_type n) const
+        {
+          if (size_ == 0) {
+            return this->end(n);
+          }
+
+          return local_iterator(
+            (buckets + static_cast<difference_type>(n))->next);
+        }
+
+        local_iterator end(size_type) const { return local_iterator(); }
+
+        size_type capacity() const noexcept { return size_; }
+
+        iterator at(size_type n) const
+        {
+          if (size_ > 0) {
+            std::size_t const N = group::N;
+
+            iterator pbg(buckets + static_cast<difference_type>(n),
+              groups + static_cast<difference_type>(n / N));
+
+            return pbg;
+          } else {
+            return this->end();
+          }
+        }
+
+        span<Bucket> raw()
+        {
+          BOOST_ASSERT(size_ == 0 || size_ < this->buckets_len());
+          return span<Bucket>(boost::to_address(buckets), size_);
+        }
+
+        size_type position(std::size_t hash) const
+        {
+          return size_policy::position(hash, size_index_);
+        }
+
+        void clear()
+        {
+          this->deallocate();
+          size_index_ = 0;
+          size_ = 0;
+        }
+
+        void append_bucket_group(iterator itb) noexcept
+        {
+          std::size_t const N = group::N;
+
+          bool const is_empty_bucket = (!itb->next);
+          if (is_empty_bucket) {
+            bucket_pointer pb = itb.p;
+            group_pointer pbg = itb.pbg;
+
+            std::size_t n =
+              static_cast<std::size_t>(boost::to_address(pb) - &buckets[0]);
+
+            bool const is_empty_group = (!pbg->bitmask);
+            if (is_empty_group) {
+              size_type const num_groups = this->groups_len();
+              group_pointer last_group =
+                groups + static_cast<difference_type>(num_groups - 1);
+
+              pbg->buckets =
+                buckets + static_cast<difference_type>(N * (n / N));
+              pbg->next = last_group->next;
+              pbg->next->prev = pbg;
+              pbg->prev = last_group;
+              pbg->prev->next = pbg;
+            }
+
+            pbg->bitmask |= set_bit(n % N);
+          }
+        }
+
+        void insert_node(iterator itb, node_pointer p) noexcept
+        {
+          this->append_bucket_group(itb);
+
+          p->next = itb->next;
+          itb->next = p;
+        }
+
+        void insert_node_hint(
+          iterator itb, node_pointer p, node_pointer hint) noexcept
+        {
+          this->append_bucket_group(itb);
+
+          if (hint) {
+            p->next = hint->next;
+            hint->next = p;
+          } else {
+            p->next = itb->next;
+            itb->next = p;
+          }
+        }
+
+        void extract_node(iterator itb, node_pointer p) noexcept
+        {
+          node_pointer* pp = std::addressof(itb->next);
+          while ((*pp) != p)
+            pp = std::addressof((*pp)->next);
+          *pp = p->next;
+          if (!itb->next)
+            unlink_bucket(itb);
+        }
+
+        void extract_node_after(iterator itb, node_pointer* pp) noexcept
+        {
+          *pp = (*pp)->next;
+          if (!itb->next)
+            unlink_bucket(itb);
+        }
+
+        void unlink_empty_buckets() noexcept
+        {
+          std::size_t const N = group::N;
+
+          group_pointer pbg = groups,
+                        last = groups + static_cast<difference_type>(
+                                          this->groups_len() - 1);
+
+          for (; pbg != last; ++pbg) {
+            if (!pbg->buckets) {
+              continue;
+            }
+
+            for (std::size_t n = 0; n < N; ++n) {
+              bucket_pointer bs = pbg->buckets;
+              bucket_type& b = bs[static_cast<std::ptrdiff_t>(n)];
+              if (!b.next)
+                pbg->bitmask &= reset_bit(n);
+            }
+            if (!pbg->bitmask && pbg->next)
+              unlink_group(pbg);
+          }
+
+          // do not check end bucket
+          for (std::size_t n = 0; n < size_ % N; ++n) {
+            if (!pbg->buckets[static_cast<std::ptrdiff_t>(n)].next)
+              pbg->bitmask &= reset_bit(n);
+          }
+        }
+
+        void unlink_bucket(iterator itb)
+        {
+          typename iterator::bucket_pointer p = itb.p;
+          typename iterator::bucket_group_pointer pbg = itb.pbg;
+          if (!(pbg->bitmask &=
+                reset_bit(static_cast<std::size_t>(p - pbg->buckets))))
+            unlink_group(pbg);
+        }
+
+      private:
+        void unlink_group(group_pointer pbg)
+        {
+          pbg->next->prev = pbg->prev;
+          pbg->prev->next = pbg->next;
+          pbg->prev = pbg->next = group_pointer();
+        }
+      };
+    } // namespace detail
+  } // namespace unordered
+} // namespace boost
+
+#endif // BOOST_UNORDERED_DETAIL_FCA_HPP

thirdparty/include/boost/unordered/detail/foa/element_type.hpp

@@ -0,0 +1,64 @@
+/* Copyright 2023 Christian Mazakas.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_DETAIL_FOA_ELEMENT_TYPE_HPP
+#define BOOST_UNORDERED_DETAIL_FOA_ELEMENT_TYPE_HPP
+
+#include <boost/core/pointer_traits.hpp>
+
+namespace boost{
+namespace unordered{
+namespace detail{
+namespace foa{
+
+template<class T,class VoidPtr>
+struct element_type
+{
+  using value_type=T;
+  using pointer=typename boost::pointer_traits<VoidPtr>::template rebind<T>;
+
+  pointer p;
+
+  /*
+   * we use a deleted copy constructor here so the type is no longer
+   * trivially copy-constructible which inhibits our memcpy
+   * optimizations when copying the tables
+   */
+  element_type()=default;
+  element_type(pointer p_):p(p_){}
+  element_type(element_type const&)=delete;
+  element_type(element_type&& rhs)noexcept
+  {
+    p = rhs.p;
+    rhs.p = nullptr;
+  }
+
+  element_type& operator=(element_type const&)=delete;
+  element_type& operator=(element_type&& rhs)noexcept
+  {
+    if (this!=&rhs){
+      p=rhs.p;
+      rhs.p=nullptr;
+    }
+    return *this;
+  }
+
+  void swap(element_type& rhs)noexcept
+  {
+    auto tmp=p;
+    p=rhs.p;
+    rhs.p=tmp;
+  }
+};
+
+}
+}
+}
+}
+
+#endif // BOOST_UNORDERED_DETAIL_FOA_ELEMENT_TYPE_HPP

thirdparty/include/boost/unordered/detail/foa/flat_map_types.hpp

@@ -0,0 +1,74 @@
+// Copyright (C) 2023 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_DETAIL_FOA_FLAT_MAP_TYPES_HPP
+#define BOOST_UNORDERED_DETAIL_FOA_FLAT_MAP_TYPES_HPP
+
+#include <boost/core/allocator_access.hpp>
+
+namespace boost {
+  namespace unordered {
+    namespace detail {
+      namespace foa {
+        template <class Key, class T> struct flat_map_types
+        {
+          using key_type = Key;
+          using mapped_type = T;
+          using raw_key_type = typename std::remove_const<Key>::type;
+          using raw_mapped_type = typename std::remove_const<T>::type;
+
+          using init_type = std::pair<raw_key_type, raw_mapped_type>;
+          using moved_type = std::pair<raw_key_type&&, raw_mapped_type&&>;
+          using value_type = std::pair<Key const, T>;
+
+          using element_type = value_type;
+
+          static value_type& value_from(element_type& x) { return x; }
+
+          template <class K, class V>
+          static raw_key_type const& extract(std::pair<K, V> const& kv)
+          {
+            return kv.first;
+          }
+
+          static moved_type move(init_type& x)
+          {
+            return {std::move(x.first), std::move(x.second)};
+          }
+
+          static moved_type move(element_type& x)
+          {
+            // TODO: we probably need to launder here
+            return {std::move(const_cast<raw_key_type&>(x.first)),
+              std::move(const_cast<raw_mapped_type&>(x.second))};
+          }
+
+          template <class A, class... Args>
+          static void construct(A& al, init_type* p, Args&&... args)
+          {
+            boost::allocator_construct(al, p, std::forward<Args>(args)...);
+          }
+
+          template <class A, class... Args>
+          static void construct(A& al, value_type* p, Args&&... args)
+          {
+            boost::allocator_construct(al, p, std::forward<Args>(args)...);
+          }
+
+          template <class A> static void destroy(A& al, init_type* p) noexcept
+          {
+            boost::allocator_destroy(al, p);
+          }
+
+          template <class A> static void destroy(A& al, value_type* p) noexcept
+          {
+            boost::allocator_destroy(al, p);
+          }
+        };
+      } // namespace foa
+    }   // namespace detail
+  }     // namespace unordered
+} // namespace boost
+
+#endif // BOOST_UNORDERED_DETAIL_FOA_FLAT_MAP_TYPES_HPP

thirdparty/include/boost/unordered/detail/foa/flat_set_types.hpp

@@ -0,0 +1,44 @@
+// Copyright (C) 2023 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_DETAIL_FOA_FLAT_SET_TYPES_HPP
+#define BOOST_UNORDERED_DETAIL_FOA_FLAT_SET_TYPES_HPP
+
+#include <boost/core/allocator_access.hpp>
+
+namespace boost {
+  namespace unordered {
+    namespace detail {
+      namespace foa {
+        template <class Key> struct flat_set_types
+        {
+          using key_type = Key;
+          using init_type = Key;
+          using value_type = Key;
+
+          static Key const& extract(value_type const& key) { return key; }
+
+          using element_type = value_type;
+
+          static Key& value_from(element_type& x) { return x; }
+
+          static element_type&& move(element_type& x) { return std::move(x); }
+
+          template <class A, class... Args>
+          static void construct(A& al, value_type* p, Args&&... args)
+          {
+            boost::allocator_construct(al, p, std::forward<Args>(args)...);
+          }
+
+          template <class A> static void destroy(A& al, value_type* p) noexcept
+          {
+            boost::allocator_destroy(al, p);
+          }
+        };
+      } // namespace foa
+    }   // namespace detail
+  }     // namespace unordered
+} // namespace boost
+
+#endif // BOOST_UNORDERED_DETAIL_FOA_FLAT_SET_TYPES_HPP

thirdparty/include/boost/unordered/detail/foa/ignore_wshadow.hpp

@@ -0,0 +1,35 @@
+/* Copyright 2023 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#include <boost/config.hpp>
+
+#if defined(BOOST_GCC)
+#if !defined(BOOST_UNORDERED_DETAIL_RESTORE_WSHADOW)
+ /* GCC's -Wshadow triggers at scenarios like this: 
+ *
+ *   struct foo{};
+ *   template<typename Base>
+ *   struct derived:Base
+ *   {
+ *     void f(){int foo;}
+ *   };
+ * 
+ *   derived<foo>x;
+ *   x.f(); // declaration of "foo" in derived::f shadows base type "foo"
+ *
+ * This makes shadowing warnings unavoidable in general when a class template
+ * derives from user-provided classes, as is the case with foa::table_core
+ * deriving from empty_value.
+ */
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wshadow"
+#else
+#pragma GCC diagnostic pop
+#endif
+#endif

thirdparty/include/boost/unordered/detail/foa/node_handle.hpp

@@ -0,0 +1,204 @@
+/* Copyright 2023 Christian Mazakas.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_DETAIL_FOA_NODE_HANDLE_HPP
+#define BOOST_UNORDERED_DETAIL_FOA_NODE_HANDLE_HPP
+
+#include <boost/unordered/detail/opt_storage.hpp>
+
+#include <boost/config.hpp>
+#include <boost/core/allocator_access.hpp>
+
+namespace boost{
+namespace unordered{
+namespace detail{
+namespace foa{
+
+template <class Iterator,class NodeType>
+struct insert_return_type
+{
+  Iterator position;
+  bool     inserted;
+  NodeType node;
+};
+
+template <class TypePolicy,class Allocator>
+struct node_handle_base
+{
+  protected:
+    using type_policy=TypePolicy;
+    using element_type=typename type_policy::element_type;
+
+  public:
+    using allocator_type = Allocator;
+
+  private:
+    using node_value_type=typename type_policy::value_type;
+    element_type p_;
+    BOOST_ATTRIBUTE_NO_UNIQUE_ADDRESS opt_storage<Allocator> a_;
+
+  protected:
+    node_value_type& data()noexcept
+    {
+      return *(p_.p);
+    }
+
+    node_value_type const& data()const noexcept
+    {
+      return *(p_.p);
+    }
+
+    element_type& element()noexcept
+    {
+      BOOST_ASSERT(!empty());
+      return p_;
+    }
+
+    element_type const& element()const noexcept
+    {
+      BOOST_ASSERT(!empty());
+      return p_;
+    }
+
+    Allocator& al()noexcept
+    {
+      BOOST_ASSERT(!empty());
+      return a_.t_;
+    }
+
+    Allocator const& al()const noexcept
+    {
+      BOOST_ASSERT(!empty());
+      return a_.t_;
+    }
+
+    void emplace(element_type&& x,Allocator a)
+    {
+      BOOST_ASSERT(empty());
+      auto* p=x.p;
+      p_.p=p;
+      new(&a_.t_)Allocator(a);
+      x.p=nullptr;
+    }
+
+    void reset()
+    {
+      a_.t_.~Allocator();
+      p_.p=nullptr;
+    }
+
+  public:
+    constexpr node_handle_base()noexcept:p_{nullptr}{}
+
+    node_handle_base(node_handle_base&& nh) noexcept
+    {
+      p_.p = nullptr;
+      if (!nh.empty()){
+        emplace(std::move(nh.p_),nh.al());
+        nh.reset();
+      }
+    }
+
+    node_handle_base& operator=(node_handle_base&& nh)noexcept
+    {
+      if(this!=&nh){
+        if(empty()){
+          if(nh.empty()){                      /* empty(),  nh.empty() */
+            /* nothing to do */
+          }else{                               /* empty(), !nh.empty() */
+            emplace(std::move(nh.p_),std::move(nh.al()));
+            nh.reset();
+          }
+        }else{
+          if(nh.empty()){                      /* !empty(),  nh.empty() */
+            type_policy::destroy(al(),&p_);
+            reset();
+          }else{                               /* !empty(), !nh.empty() */
+            bool const pocma=
+              boost::allocator_propagate_on_container_move_assignment<
+                Allocator>::type::value;
+
+            BOOST_ASSERT(pocma||al()==nh.al());
+
+            type_policy::destroy(al(),&p_);
+            if(pocma){
+              al()=std::move(nh.al());
+            }
+
+            p_=std::move(nh.p_);
+            nh.reset();
+          }
+        }
+      }else{
+        if(empty()){                           /* empty(),  nh.empty() */
+          /* nothing to do */
+        }else{                                 /* !empty(), !nh.empty() */
+          type_policy::destroy(al(),&p_);
+          reset();
+        }
+      }
+      return *this;
+    }
+
+    ~node_handle_base()
+    {
+      if(!empty()){
+        type_policy::destroy(al(),&p_);
+        reset();
+      }
+    }
+
+    allocator_type get_allocator()const noexcept{return al();}
+    explicit operator bool()const noexcept{ return !empty();}
+    BOOST_ATTRIBUTE_NODISCARD bool empty()const noexcept{return p_.p==nullptr;}
+
+    void swap(node_handle_base& nh) noexcept(
+      boost::allocator_is_always_equal<Allocator>::type::value||
+      boost::allocator_propagate_on_container_swap<Allocator>::type::value)
+    {
+      if(this!=&nh){
+        if(empty()){
+          if(nh.empty()) {
+            /* nothing to do here */
+          } else {
+            emplace(std::move(nh.p_), nh.al());
+            nh.reset();
+          }
+        }else{
+          if(nh.empty()){
+            nh.emplace(std::move(p_),al());
+            reset();
+          }else{
+            bool const pocs=
+              boost::allocator_propagate_on_container_swap<
+                Allocator>::type::value;
+
+            BOOST_ASSERT(pocs || al()==nh.al());
+
+            using std::swap;
+            p_.swap(nh.p_);
+            if(pocs)swap(al(),nh.al());
+          }
+        }
+      }
+    }
+
+    friend
+    void swap(node_handle_base& lhs,node_handle_base& rhs)
+      noexcept(noexcept(lhs.swap(rhs)))
+    {
+      return lhs.swap(rhs);
+    }
+};
+
+}
+}
+}
+}
+
+#endif // BOOST_UNORDERED_DETAIL_FOA_NODE_HANDLE_HPP

thirdparty/include/boost/unordered/detail/foa/node_map_types.hpp

@@ -0,0 +1,127 @@
+// Copyright (C) 2023 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_DETAIL_FOA_NODE_MAP_TYPES_HPP
+#define BOOST_UNORDERED_DETAIL_FOA_NODE_MAP_TYPES_HPP
+
+#include <boost/unordered/detail/foa/element_type.hpp>
+
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/no_exceptions_support.hpp>
+#include <boost/core/pointer_traits.hpp>
+
+namespace boost {
+  namespace unordered {
+    namespace detail {
+      namespace foa {
+        template <class Key, class T, class VoidPtr> struct node_map_types
+        {
+          using key_type = Key;
+          using mapped_type = T;
+          using raw_key_type = typename std::remove_const<Key>::type;
+          using raw_mapped_type = typename std::remove_const<T>::type;
+
+          using init_type = std::pair<raw_key_type, raw_mapped_type>;
+          using value_type = std::pair<Key const, T>;
+          using moved_type = std::pair<raw_key_type&&, raw_mapped_type&&>;
+
+          using element_type = foa::element_type<value_type, VoidPtr>;
+
+          static value_type& value_from(element_type const& x)
+          {
+            return *(x.p);
+          }
+
+          template <class K, class V>
+          static raw_key_type const& extract(std::pair<K, V> const& kv)
+          {
+            return kv.first;
+          }
+
+          static raw_key_type const& extract(element_type const& kv)
+          {
+            return kv.p->first;
+          }
+
+          static element_type&& move(element_type& x) { return std::move(x); }
+          static moved_type move(init_type& x)
+          {
+            return {std::move(x.first), std::move(x.second)};
+          }
+
+          static moved_type move(value_type& x)
+          {
+            return {std::move(const_cast<raw_key_type&>(x.first)),
+              std::move(const_cast<raw_mapped_type&>(x.second))};
+          }
+
+          template <class A>
+          static void construct(A&, element_type* p, element_type&& x) noexcept
+          {
+            p->p = x.p;
+            x.p = nullptr;
+          }
+
+          template <class A>
+          static void construct(
+            A& al, element_type* p, element_type const& copy)
+          {
+            construct(al, p, *copy.p);
+          }
+
+          template <class A, class... Args>
+          static void construct(A& al, init_type* p, Args&&... args)
+          {
+            boost::allocator_construct(al, p, std::forward<Args>(args)...);
+          }
+
+          template <class A, class... Args>
+          static void construct(A& al, value_type* p, Args&&... args)
+          {
+            boost::allocator_construct(al, p, std::forward<Args>(args)...);
+          }
+
+          template <class A, class... Args>
+          static void construct(A& al, element_type* p, Args&&... args)
+          {
+            p->p = boost::allocator_allocate(al, 1);
+            BOOST_TRY
+            {
+              boost::allocator_construct(
+                al, boost::to_address(p->p), std::forward<Args>(args)...);
+            }
+            BOOST_CATCH(...)
+            {
+              boost::allocator_deallocate(al, p->p, 1);
+              BOOST_RETHROW
+            }
+            BOOST_CATCH_END
+          }
+
+          template <class A> static void destroy(A& al, value_type* p) noexcept
+          {
+            boost::allocator_destroy(al, p);
+          }
+
+          template <class A> static void destroy(A& al, init_type* p) noexcept
+          {
+            boost::allocator_destroy(al, p);
+          }
+
+          template <class A>
+          static void destroy(A& al, element_type* p) noexcept
+          {
+            if (p->p) {
+              destroy(al, boost::to_address(p->p));
+              boost::allocator_deallocate(al, p->p, 1);
+            }
+          }
+        };
+
+      } // namespace foa
+    }   // namespace detail
+  }     // namespace unordered
+} // namespace boost
+
+#endif // BOOST_UNORDERED_DETAIL_FOA_NODE_MAP_TYPES_HPP

thirdparty/include/boost/unordered/detail/foa/node_set_types.hpp

@@ -0,0 +1,92 @@
+// Copyright (C) 2023 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_DETAIL_FOA_NODE_SET_TYPES_HPP
+#define BOOST_UNORDERED_DETAIL_FOA_NODE_SET_TYPES_HPP
+
+#include <boost/unordered/detail/foa/element_type.hpp>
+
+#include <boost/core/allocator_access.hpp>
+#include <boost/core/no_exceptions_support.hpp>
+#include <boost/core/pointer_traits.hpp>
+
+namespace boost {
+  namespace unordered {
+    namespace detail {
+      namespace foa {
+
+        template <class Key, class VoidPtr> struct node_set_types
+        {
+          using key_type = Key;
+          using init_type = Key;
+          using value_type = Key;
+
+          static Key const& extract(value_type const& key) { return key; }
+
+          using element_type = foa::element_type<value_type, VoidPtr>;
+
+          static value_type& value_from(element_type const& x) { return *x.p; }
+          static Key const& extract(element_type const& k) { return *k.p; }
+          static element_type&& move(element_type& x) { return std::move(x); }
+          static value_type&& move(value_type& x) { return std::move(x); }
+
+          template <class A>
+          static void construct(
+            A& al, element_type* p, element_type const& copy)
+          {
+            construct(al, p, *copy.p);
+          }
+
+          template <typename Allocator>
+          static void construct(
+            Allocator&, element_type* p, element_type&& x) noexcept
+          {
+            p->p = x.p;
+            x.p = nullptr;
+          }
+
+          template <class A, class... Args>
+          static void construct(A& al, value_type* p, Args&&... args)
+          {
+            boost::allocator_construct(al, p, std::forward<Args>(args)...);
+          }
+
+          template <class A, class... Args>
+          static void construct(A& al, element_type* p, Args&&... args)
+          {
+            p->p = boost::allocator_allocate(al, 1);
+            BOOST_TRY
+            {
+              boost::allocator_construct(
+                al, boost::to_address(p->p), std::forward<Args>(args)...);
+            }
+            BOOST_CATCH(...)
+            {
+              boost::allocator_deallocate(al, p->p, 1);
+              BOOST_RETHROW
+            }
+            BOOST_CATCH_END
+          }
+
+          template <class A> static void destroy(A& al, value_type* p) noexcept
+          {
+            boost::allocator_destroy(al, p);
+          }
+
+          template <class A>
+          static void destroy(A& al, element_type* p) noexcept
+          {
+            if (p->p) {
+              destroy(al, boost::to_address(p->p));
+              boost::allocator_deallocate(al, p->p, 1);
+            }
+          }
+        };
+
+      } // namespace foa
+    }   // namespace detail
+  }     // namespace unordered
+} // namespace boost
+
+#endif // BOOST_UNORDERED_DETAIL_FOA_NODE_SET_TYPES_HPP

thirdparty/include/boost/unordered/detail/foa/reentrancy_check.hpp

@@ -0,0 +1,138 @@
+/* Copyright 2023 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_DETAIL_FOA_REENTRANCY_CHECK_HPP
+#define BOOST_UNORDERED_DETAIL_FOA_REENTRANCY_CHECK_HPP
+
+#include <boost/assert.hpp>
+#include <utility>
+
+#if !defined(BOOST_UNORDERED_DISABLE_REENTRANCY_CHECK)&& \
+    !defined(BOOST_ASSERT_IS_VOID)
+#define BOOST_UNORDERED_REENTRANCY_CHECK
+#endif
+
+namespace boost{
+namespace unordered{
+namespace detail{
+namespace foa{
+
+#if defined(BOOST_UNORDERED_REENTRANCY_CHECK)
+
+class entry_trace
+{
+public:
+  entry_trace(const void* px_):px{px_}
+  {
+    if(px){
+      BOOST_ASSERT_MSG(!find(px),"reentrancy not allowed");
+      header()=this;
+    }
+  }
+
+  /* not used but VS in pre-C++17 mode needs to see it for RVO */
+  entry_trace(const entry_trace&);
+
+  ~entry_trace(){clear();}
+
+  void clear()
+  {
+    if(px){
+      header()=next;
+      px=nullptr;
+    }
+  }
+  
+private:
+  static entry_trace*& header()
+  {
+    thread_local entry_trace *pe=nullptr;
+    return pe;
+  }
+
+  static bool find(const void* px)
+  {
+    for(auto pe=header();pe;pe=pe->next){
+      if(pe->px==px)return true;
+    }
+    return false;
+  }
+
+  const void  *px;
+  entry_trace *next=header();
+};
+
+template<typename LockGuard>
+struct reentrancy_checked
+{
+  template<typename... Args>
+  reentrancy_checked(const void* px,Args&&... args):
+    tr{px},lck{std::forward<Args>(args)...}{}
+
+  void unlock()
+  {
+    lck.unlock();
+    tr.clear();
+  }
+
+  entry_trace tr;
+  LockGuard   lck;
+};
+
+template<typename LockGuard>
+struct reentrancy_bichecked
+{
+  template<typename... Args>
+  reentrancy_bichecked(const void* px,const void* py,Args&&... args):
+    tr1{px},tr2{py!=px?py:nullptr},lck{std::forward<Args>(args)...}{}
+
+  void unlock()
+  {
+    lck.unlock();
+    tr2.clear();
+    tr1.clear();
+  }
+
+  entry_trace tr1,tr2;
+  LockGuard   lck;
+};
+
+#else
+
+template<typename LockGuard>
+struct reentrancy_checked
+{
+  template<typename... Args>
+  reentrancy_checked(const void*,Args&&... args):
+    lck{std::forward<Args>(args)...}{}
+
+  void unlock(){lck.unlock();}
+
+  LockGuard lck;
+};
+
+template<typename LockGuard>
+struct reentrancy_bichecked
+{
+  template<typename... Args>
+  reentrancy_bichecked(const void*,const void*,Args&&... args):
+    lck{std::forward<Args>(args)...}{}
+
+  void unlock(){lck.unlock();}
+
+  LockGuard lck;
+};
+
+#endif
+
+} /* namespace foa */
+} /* namespace detail */
+} /* namespace unordered */
+} /* namespace boost */
+
+#endif

thirdparty/include/boost/unordered/detail/foa/restore_wshadow.hpp

@@ -0,0 +1,11 @@
+/* Copyright 2023 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#define BOOST_UNORDERED_DETAIL_RESTORE_WSHADOW
+#include <boost/unordered/detail/foa/ignore_wshadow.hpp>
+#undef BOOST_UNORDERED_DETAIL_RESTORE_WSHADOW

thirdparty/include/boost/unordered/detail/foa/rw_spinlock.hpp

@@ -0,0 +1,179 @@
+#ifndef BOOST_UNORDERED_DETAIL_FOA_RW_SPINLOCK_HPP_INCLUDED
+#define BOOST_UNORDERED_DETAIL_FOA_RW_SPINLOCK_HPP_INCLUDED
+
+// Copyright 2023 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/core/yield_primitives.hpp>
+#include <atomic>
+#include <cstdint>
+
+namespace boost{
+namespace unordered{
+namespace detail{
+namespace foa{
+
+class rw_spinlock
+{
+private:
+
+    // bit 31: locked exclusive
+    // bit 30: writer pending
+    // bit 29..0: reader lock count
+
+    static constexpr std::uint32_t locked_exclusive_mask = 1u << 31; // 0x8000'0000
+    static constexpr std::uint32_t writer_pending_mask = 1u << 30; // 0x4000'0000
+    static constexpr std::uint32_t reader_lock_count_mask = writer_pending_mask - 1; // 0x3FFF'FFFF
+
+    std::atomic<std::uint32_t> state_ = {};
+
+private:
+
+    // Effects: Provides a hint to the implementation that the current thread
+    //          has been unable to make progress for k+1 iterations.
+
+    static void yield( unsigned k ) noexcept
+    {
+        unsigned const sleep_every = 1024; // see below
+
+        k %= sleep_every;
+
+        if( k < 5 )
+        {
+            // Intel recommendation from the Optimization Reference Manual
+            // Exponentially increase number of PAUSE instructions each
+            // iteration until reaching a maximum which is approximately
+            // one timeslice long (2^4 == 16 in our case)
+
+            unsigned const pause_count = 1u << k;
+
+            for( unsigned i = 0; i < pause_count; ++i )
+            {
+                boost::core::sp_thread_pause();
+            }
+        }
+        else if( k < sleep_every - 1 )
+        {
+            // Once the maximum number of PAUSE instructions is reached,
+            // we switch to yielding the timeslice immediately
+
+            boost::core::sp_thread_yield();
+        }
+        else
+        {
+            // After `sleep_every` iterations of no progress, we sleep,
+            // to avoid a deadlock if a lower priority thread has the lock
+
+            boost::core::sp_thread_sleep();
+        }
+    }
+
+public:
+
+    bool try_lock_shared() noexcept
+    {
+        std::uint32_t st = state_.load( std::memory_order_relaxed );
+
+        if( st >= reader_lock_count_mask )
+        {
+            // either bit 31 set, bit 30 set, or reader count is max
+            return false;
+        }
+
+        std::uint32_t newst = st + 1;
+        return state_.compare_exchange_strong( st, newst, std::memory_order_acquire, std::memory_order_relaxed );
+    }
+
+    void lock_shared() noexcept
+    {
+        for( unsigned k = 0; ; ++k )
+        {
+            std::uint32_t st = state_.load( std::memory_order_relaxed );
+
+            if( st < reader_lock_count_mask )
+            {
+                std::uint32_t newst = st + 1;
+                if( state_.compare_exchange_weak( st, newst, std::memory_order_acquire, std::memory_order_relaxed ) ) return;
+            }
+
+            yield( k );
+        }
+    }
+
+    void unlock_shared() noexcept
+    {
+        // pre: locked shared, not locked exclusive
+
+        state_.fetch_sub( 1, std::memory_order_release );
+
+        // if the writer pending bit is set, there's a writer waiting
+        // let it acquire the lock; it will clear the bit on unlock
+    }
+
+    bool try_lock() noexcept
+    {
+        std::uint32_t st = state_.load( std::memory_order_relaxed );
+
+        if( st & locked_exclusive_mask )
+        {
+            // locked exclusive
+            return false;
+        }
+
+        if( st & reader_lock_count_mask )
+        {
+            // locked shared
+            return false;
+        }
+
+        std::uint32_t newst = locked_exclusive_mask;
+        return state_.compare_exchange_strong( st, newst, std::memory_order_acquire, std::memory_order_relaxed );
+    }
+
+    void lock() noexcept
+    {
+        for( unsigned k = 0; ; ++k )
+        {
+            std::uint32_t st = state_.load( std::memory_order_relaxed );
+
+            if( st & locked_exclusive_mask )
+            {
+                // locked exclusive, spin
+            }
+            else if( ( st & reader_lock_count_mask ) == 0 )
+            {
+                // not locked exclusive, not locked shared, try to lock
+
+                std::uint32_t newst = locked_exclusive_mask;
+                if( state_.compare_exchange_weak( st, newst, std::memory_order_acquire, std::memory_order_relaxed ) ) return;
+            }
+            else if( st & writer_pending_mask )
+            {
+                // writer pending bit already set, nothing to do
+            }
+            else
+            {
+                // locked shared, set writer pending bit
+
+                std::uint32_t newst = st | writer_pending_mask;
+                state_.compare_exchange_weak( st, newst, std::memory_order_relaxed, std::memory_order_relaxed );
+            }
+
+            yield( k );
+        }
+    }
+
+    void unlock() noexcept
+    {
+        // pre: locked exclusive, not locked shared
+        state_.store( 0, std::memory_order_release );
+    }
+};
+
+} /* namespace foa */
+} /* namespace detail */
+} /* namespace unordered */
+} /* namespace boost */
+
+#endif // BOOST_UNORDERED_DETAIL_FOA_RW_SPINLOCK_HPP_INCLUDED

thirdparty/include/boost/unordered/detail/foa/table.hpp

@@ -0,0 +1,626 @@
+/* Fast open-addressing hash table.
+ *
+ * Copyright 2022-2023 Joaquin M Lopez Munoz.
+ * Copyright 2023 Christian Mazakas.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_DETAIL_FOA_TABLE_HPP
+#define BOOST_UNORDERED_DETAIL_FOA_TABLE_HPP
+
+#include <boost/assert.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+#include <boost/core/serialization.hpp>
+#include <boost/unordered/detail/foa/core.hpp>
+#include <boost/unordered/detail/serialize_tracked_address.hpp>
+#include <cstddef>
+#include <iterator>
+#include <memory>
+#include <type_traits>
+#include <utility>
+
+namespace boost{
+namespace unordered{
+namespace detail{
+namespace foa{
+
+/* use plain integrals for group metadata storage */
+
+template<typename Integral>
+struct plain_integral
+{
+  operator Integral()const{return n;}
+  void operator=(Integral m){n=m;}
+
+#if BOOST_WORKAROUND(BOOST_GCC,>=50000 && BOOST_GCC<60000)
+  void operator|=(Integral m){n=static_cast<Integral>(n|m);}
+  void operator&=(Integral m){n=static_cast<Integral>(n&m);}
+#else
+  void operator|=(Integral m){n|=m;}
+  void operator&=(Integral m){n&=m;}
+#endif
+
+  Integral n;
+};
+
+struct plain_size_control
+{
+  std::size_t ml;
+  std::size_t size;
+};
+
+template<typename,typename,typename,typename>
+class table;
+
+/* table_iterator keeps two pointers:
+ * 
+ *   - A pointer p to the element slot.
+ *   - A pointer pc to the n-th byte of the associated group metadata, where n
+ *     is the position of the element in the group.
+ *
+ * A simpler solution would have been to keep a pointer p to the element, a
+ * pointer pg to the group, and the position n, but that would increase
+ * sizeof(table_iterator) by 4/8 bytes. In order to make this compact
+ * representation feasible, it is required that group objects are aligned
+ * to their size, so that we can recover pg and n as
+ * 
+ *   - n = pc%sizeof(group)
+ *   - pg = pc-n
+ * 
+ * (for explanatory purposes pg and pc are treated above as if they were memory
+ * addresses rather than pointers).
+ * 
+ * p = nullptr is conventionally used to mark end() iterators.
+ */
+
+/* internal conversion from const_iterator to iterator */
+struct const_iterator_cast_tag{}; 
+
+template<typename TypePolicy,typename GroupPtr,bool Const>
+class table_iterator
+{
+  using group_pointer_traits=boost::pointer_traits<GroupPtr>;
+  using type_policy=TypePolicy;
+  using table_element_type=typename type_policy::element_type;
+  using group_type=typename group_pointer_traits::element_type;
+  using table_element_pointer=
+    typename group_pointer_traits::template rebind<table_element_type>;
+  using char_pointer=
+    typename group_pointer_traits::template rebind<unsigned char>;
+  static constexpr auto N=group_type::N;
+  static constexpr auto regular_layout=group_type::regular_layout;
+
+public:
+  using difference_type=std::ptrdiff_t;
+  using value_type=typename type_policy::value_type;
+  using pointer=
+    typename std::conditional<Const,value_type const*,value_type*>::type;
+  using reference=
+    typename std::conditional<Const,value_type const&,value_type&>::type;
+  using iterator_category=std::forward_iterator_tag;
+  using element_type=
+    typename std::conditional<Const,value_type const,value_type>::type;
+
+  table_iterator():pc_{nullptr},p_{nullptr}{};
+  template<bool Const2,typename std::enable_if<!Const2>::type* =nullptr>
+  table_iterator(const table_iterator<TypePolicy,GroupPtr,Const2>& x):
+    pc_{x.pc_},p_{x.p_}{}
+  table_iterator(
+    const_iterator_cast_tag, const table_iterator<TypePolicy,GroupPtr,true>& x):
+    pc_{x.pc_},p_{x.p_}{}
+
+  inline reference operator*()const noexcept
+    {return type_policy::value_from(*p());}
+  inline pointer operator->()const noexcept
+    {return std::addressof(type_policy::value_from(*p()));}
+  inline table_iterator& operator++()noexcept{increment();return *this;}
+  inline table_iterator operator++(int)noexcept
+    {auto x=*this;increment();return x;}
+  friend inline bool operator==(
+    const table_iterator& x,const table_iterator& y)
+    {return x.p()==y.p();}
+  friend inline bool operator!=(
+    const table_iterator& x,const table_iterator& y)
+    {return !(x==y);}
+
+private:
+  template<typename,typename,bool> friend class table_iterator;
+  template<typename> friend class table_erase_return_type;
+  template<typename,typename,typename,typename> friend class table;
+
+  table_iterator(group_type* pg,std::size_t n,const table_element_type* ptet):
+    pc_{to_pointer<char_pointer>(
+      reinterpret_cast<unsigned char*>(const_cast<group_type*>(pg))+n)},
+    p_{to_pointer<table_element_pointer>(const_cast<table_element_type*>(ptet))}
+  {}
+
+  unsigned char* pc()const noexcept{return boost::to_address(pc_);}
+  table_element_type* p()const noexcept{return boost::to_address(p_);}
+
+  inline void increment()noexcept
+  {
+    BOOST_ASSERT(p()!=nullptr);
+    increment(std::integral_constant<bool,regular_layout>{});
+  }
+
+  inline void increment(std::true_type /* regular layout */)noexcept
+  {
+    using diff_type=
+      typename boost::pointer_traits<char_pointer>::difference_type;
+
+    for(;;){
+      ++p_;
+      if(reinterpret_cast<uintptr_t>(pc())%sizeof(group_type)==N-1){
+        pc_+=static_cast<diff_type>(sizeof(group_type)-(N-1));
+        break;
+      }
+      ++pc_;
+      if(!group_type::is_occupied(pc()))continue;
+      if(BOOST_UNLIKELY(group_type::is_sentinel(pc())))p_=nullptr;
+      return;
+    }
+
+    for(;;){
+      int mask=reinterpret_cast<group_type*>(pc())->match_occupied();
+      if(mask!=0){
+        auto n=unchecked_countr_zero(mask);
+        if(BOOST_UNLIKELY(reinterpret_cast<group_type*>(pc())->is_sentinel(n))){
+          p_=nullptr;
+        }
+        else{
+          pc_+=static_cast<diff_type>(n);
+          p_+=static_cast<diff_type>(n);
+        }
+        return;
+      }
+      pc_+=static_cast<diff_type>(sizeof(group_type));
+      p_+=static_cast<diff_type>(N);
+    }
+  }
+
+  inline void increment(std::false_type /* interleaved */)noexcept
+  {
+    using diff_type=
+      typename boost::pointer_traits<char_pointer>::difference_type;
+
+    std::size_t n0=reinterpret_cast<uintptr_t>(pc())%sizeof(group_type);
+    pc_-=static_cast<diff_type>(n0);
+
+    int mask=(
+      reinterpret_cast<group_type*>(pc())->match_occupied()>>(n0+1))<<(n0+1);
+    if(!mask){
+      do{
+        pc_+=sizeof(group_type);
+        p_+=N;
+      }
+      while((mask=reinterpret_cast<group_type*>(pc())->match_occupied())==0);
+    }
+
+    auto n=unchecked_countr_zero(mask);
+    if(BOOST_UNLIKELY(reinterpret_cast<group_type*>(pc())->is_sentinel(n))){
+      p_=nullptr;
+    }
+    else{
+      pc_+=static_cast<diff_type>(n);
+      p_-=static_cast<diff_type>(n0);
+      p_+=static_cast<diff_type>(n);
+    }
+  }
+
+  template<typename Archive>
+  friend void serialization_track(Archive& ar,const table_iterator& x)
+  {
+    if(x.p()){
+      track_address(ar,x.pc_);
+      track_address(ar,x.p_);
+    }
+  }
+
+  friend class boost::serialization::access;
+
+  template<typename Archive>
+  void serialize(Archive& ar,unsigned int)
+  {
+    if(!p())pc_=nullptr;
+    serialize_tracked_address(ar,pc_);
+    serialize_tracked_address(ar,p_);
+  }
+
+  char_pointer          pc_=nullptr;
+  table_element_pointer  p_=nullptr;
+};
+
+/* Returned by table::erase([const_]iterator) to avoid iterator increment
+ * if discarded.
+ */
+
+template<typename Iterator>
+class table_erase_return_type; 
+
+template<typename TypePolicy,typename GroupPtr,bool Const>
+class table_erase_return_type<table_iterator<TypePolicy,GroupPtr,Const>>
+{
+  using iterator=table_iterator<TypePolicy,GroupPtr,Const>;
+  using const_iterator=table_iterator<TypePolicy,GroupPtr,true>;
+
+public:
+  /* can't delete it because VS in pre-C++17 mode needs to see it for RVO */
+  table_erase_return_type(const table_erase_return_type&);
+
+  operator iterator()const noexcept
+  {
+    auto it=pos;
+    it.increment(); /* valid even if *it was erased */
+    return iterator(const_iterator_cast_tag{},it);
+  }
+
+  template<
+    bool dependent_value=false,
+    typename std::enable_if<!Const||dependent_value>::type* =nullptr
+  >
+  operator const_iterator()const noexcept{return this->operator iterator();}
+
+private:
+  template<typename,typename,typename,typename> friend class table;
+
+  table_erase_return_type(const_iterator pos_):pos{pos_}{}
+  table_erase_return_type& operator=(const table_erase_return_type&)=delete;
+
+  const_iterator pos;
+};
+
+/* foa::table interface departs in a number of ways from that of C++ unordered
+ * associative containers because it's not for end-user consumption
+ * (boost::unordered_(flat|node)_(map|set) wrappers complete it as
+ * appropriate).
+ *
+ * The table supports two main modes of operation: flat and node-based. In the
+ * flat case, buckets directly store elements. For node-based, buckets store
+ * pointers to individually heap-allocated elements.
+ *
+ * For both flat and node-based:
+ *
+ *   - begin() is not O(1).
+ *   - No bucket API.
+ *   - Load factor is fixed and can't be set by the user.
+ * 
+ * For flat only:
+ *
+ *   - value_type must be moveable.
+ *   - Pointer stability is not kept under rehashing.
+ *   - No extract API.
+ *
+ * try_emplace, erase and find support heterogeneous lookup by default,
+ * that is, without checking for any ::is_transparent typedefs --the
+ * checking is done by boost::unordered_(flat|node)_(map|set).
+ */
+
+template<typename,typename,typename,typename>
+class concurrent_table; /* concurrent/non-concurrent interop */
+
+template <typename TypePolicy,typename Hash,typename Pred,typename Allocator>
+using table_core_impl=
+  table_core<TypePolicy,group15<plain_integral>,table_arrays,
+  plain_size_control,Hash,Pred,Allocator>;
+
+#include <boost/unordered/detail/foa/ignore_wshadow.hpp>
+
+#if defined(BOOST_MSVC)
+#pragma warning(push)
+#pragma warning(disable:4714) /* marked as __forceinline not inlined */
+#endif
+
+template<typename TypePolicy,typename Hash,typename Pred,typename Allocator>
+class table:table_core_impl<TypePolicy,Hash,Pred,Allocator>
+{
+  using super=table_core_impl<TypePolicy,Hash,Pred,Allocator>;
+  using type_policy=typename super::type_policy;
+  using group_type=typename super::group_type;
+  using super::N;
+  using prober=typename super::prober;
+  using arrays_type=typename super::arrays_type;
+  using size_ctrl_type=typename super::size_ctrl_type;
+  using locator=typename super::locator;
+  using compatible_concurrent_table=
+    concurrent_table<TypePolicy,Hash,Pred,Allocator>;
+  using group_type_pointer=typename boost::pointer_traits<
+    typename boost::allocator_pointer<Allocator>::type
+  >::template rebind<group_type>;
+  friend compatible_concurrent_table;
+
+public:
+  using key_type=typename super::key_type;
+  using init_type=typename super::init_type;
+  using value_type=typename super::value_type;
+  using element_type=typename super::element_type;
+
+private:
+  static constexpr bool has_mutable_iterator=
+    !std::is_same<key_type,value_type>::value;
+public:
+  using hasher=typename super::hasher;
+  using key_equal=typename super::key_equal;
+  using allocator_type=typename super::allocator_type;
+  using pointer=typename super::pointer;
+  using const_pointer=typename super::const_pointer;
+  using reference=typename super::reference;
+  using const_reference=typename super::const_reference;
+  using size_type=typename super::size_type;
+  using difference_type=typename super::difference_type;
+  using const_iterator=table_iterator<type_policy,group_type_pointer,true>;
+  using iterator=typename std::conditional<
+    has_mutable_iterator,
+    table_iterator<type_policy,group_type_pointer,false>,
+    const_iterator>::type;
+  using erase_return_type=table_erase_return_type<iterator>;
+
+  table(
+    std::size_t n=default_bucket_count,const Hash& h_=Hash(),
+    const Pred& pred_=Pred(),const Allocator& al_=Allocator()):
+    super{n,h_,pred_,al_}
+    {}
+
+  table(const table& x)=default;
+  table(table&& x)=default;
+  table(const table& x,const Allocator& al_):super{x,al_}{}
+  table(table&& x,const Allocator& al_):super{std::move(x),al_}{}
+  table(compatible_concurrent_table&& x):
+    table(std::move(x),x.exclusive_access()){}
+  ~table()=default;
+
+  table& operator=(const table& x)=default;
+  table& operator=(table&& x)=default;
+
+  using super::get_allocator;
+
+  iterator begin()noexcept
+  {
+    iterator it{this->arrays.groups(),0,this->arrays.elements()};
+    if(this->arrays.elements()&&
+       !(this->arrays.groups()[0].match_occupied()&0x1))++it;
+    return it;
+  }
+
+  const_iterator begin()const noexcept
+                   {return const_cast<table*>(this)->begin();}
+  iterator       end()noexcept{return {};}
+  const_iterator end()const noexcept{return const_cast<table*>(this)->end();}
+  const_iterator cbegin()const noexcept{return begin();}
+  const_iterator cend()const noexcept{return end();}
+
+  using super::empty;
+  using super::size;
+  using super::max_size;
+
+  template<typename... Args>
+  BOOST_FORCEINLINE std::pair<iterator,bool> emplace(Args&&... args)
+  {
+    auto x=alloc_make_insert_type<type_policy>(
+      this->al(),std::forward<Args>(args)...);
+    return emplace_impl(type_policy::move(x.value()));
+  }
+
+  template<typename Key,typename... Args>
+  BOOST_FORCEINLINE std::pair<iterator,bool> try_emplace(
+    Key&& x,Args&&... args)
+  {
+    return emplace_impl(
+      try_emplace_args_t{},std::forward<Key>(x),std::forward<Args>(args)...);
+  }
+
+  BOOST_FORCEINLINE std::pair<iterator,bool>
+  insert(const init_type& x){return emplace_impl(x);}
+
+  BOOST_FORCEINLINE std::pair<iterator,bool>
+  insert(init_type&& x){return emplace_impl(std::move(x));}
+
+  /* template<typename=void> tilts call ambiguities in favor of init_type */
+
+  template<typename=void>
+  BOOST_FORCEINLINE std::pair<iterator,bool>
+  insert(const value_type& x){return emplace_impl(x);}
+
+  template<typename=void>
+  BOOST_FORCEINLINE std::pair<iterator,bool>
+  insert(value_type&& x){return emplace_impl(std::move(x));}
+
+  template<typename T=element_type>
+  BOOST_FORCEINLINE
+  typename std::enable_if<
+    !std::is_same<T,value_type>::value,
+    std::pair<iterator,bool>
+  >::type
+  insert(element_type&& x){return emplace_impl(std::move(x));}
+
+  template<
+    bool dependent_value=false,
+    typename std::enable_if<
+      has_mutable_iterator||dependent_value>::type* =nullptr
+  >
+  erase_return_type erase(iterator pos)noexcept
+  {return erase(const_iterator(pos));}
+
+  BOOST_FORCEINLINE
+  erase_return_type erase(const_iterator pos)noexcept
+  {
+    super::erase(pos.pc(),pos.p());
+    return {pos};
+  }
+
+  template<typename Key>
+  BOOST_FORCEINLINE
+  auto erase(Key&& x) -> typename std::enable_if<
+    !std::is_convertible<Key,iterator>::value&&
+    !std::is_convertible<Key,const_iterator>::value, std::size_t>::type
+  {
+    auto it=find(x);
+    if(it!=end()){
+      erase(it);
+      return 1;
+    }
+    else return 0;
+  }
+
+  void swap(table& x)
+    noexcept(noexcept(std::declval<super&>().swap(std::declval<super&>())))
+  {
+    super::swap(x);
+  }
+
+  using super::clear;
+
+  element_type extract(const_iterator pos)
+  {
+    BOOST_ASSERT(pos!=end());
+    erase_on_exit e{*this,pos};
+    (void)e;
+    return std::move(*pos.p());
+  }
+
+  // TODO: should we accept different allocator too?
+  template<typename Hash2,typename Pred2>
+  void merge(table<TypePolicy,Hash2,Pred2,Allocator>& x)
+  {
+    x.for_all_elements([&,this](group_type* pg,unsigned int n,element_type* p){
+      erase_on_exit e{x,{pg,n,p}};
+      if(!emplace_impl(type_policy::move(*p)).second)e.rollback();
+    });
+  }
+
+  template<typename Hash2,typename Pred2>
+  void merge(table<TypePolicy,Hash2,Pred2,Allocator>&& x){merge(x);}
+
+  using super::hash_function;
+  using super::key_eq;
+
+  template<typename Key>
+  BOOST_FORCEINLINE iterator find(const Key& x)
+  {
+    return make_iterator(super::find(x));
+  }
+
+  template<typename Key>
+  BOOST_FORCEINLINE const_iterator find(const Key& x)const
+  {
+    return const_cast<table*>(this)->find(x);
+  }
+
+  using super::capacity;
+  using super::load_factor;
+  using super::max_load_factor;
+  using super::max_load;
+  using super::rehash;
+  using super::reserve;
+
+  template<typename Predicate>
+  friend std::size_t erase_if(table& x,Predicate& pr)
+  {
+    using value_reference=typename std::conditional<
+      std::is_same<key_type,value_type>::value,
+      const_reference,
+      reference
+    >::type;
+
+    std::size_t s=x.size();
+    x.for_all_elements(
+      [&](group_type* pg,unsigned int n,element_type* p){
+        if(pr(const_cast<value_reference>(type_policy::value_from(*p)))){
+          x.super::erase(pg,n,p);
+        }
+      });
+    return std::size_t(s-x.size());
+  }
+
+  friend bool operator==(const table& x,const table& y)
+  {
+    return static_cast<const super&>(x)==static_cast<const super&>(y);
+  }
+
+  friend bool operator!=(const table& x,const table& y){return !(x==y);}
+
+private:
+  template<typename ArraysType>
+  table(compatible_concurrent_table&& x,arrays_holder<ArraysType,Allocator>&& ah):
+    super{
+      std::move(x.h()),std::move(x.pred()),std::move(x.al()),
+      [&x]{return arrays_type{
+        x.arrays.groups_size_index,x.arrays.groups_size_mask,
+        to_pointer<group_type_pointer>(
+          reinterpret_cast<group_type*>(x.arrays.groups())),
+        x.arrays.elements_};},
+      size_ctrl_type{x.size_ctrl.ml,x.size_ctrl.size}}
+  {
+    compatible_concurrent_table::arrays_type::delete_group_access(x.al(),x.arrays);
+    x.arrays=ah.release();
+    x.size_ctrl.ml=x.initial_max_load();
+    x.size_ctrl.size=0;
+  }
+
+  template<typename ExclusiveLockGuard>
+  table(compatible_concurrent_table&& x,ExclusiveLockGuard):
+    table(std::move(x),x.make_empty_arrays())
+  {}
+
+  struct erase_on_exit
+  {
+    erase_on_exit(table& x_,const_iterator it_):x(x_),it(it_){}
+    ~erase_on_exit(){if(!rollback_)x.erase(it);}
+
+    void rollback(){rollback_=true;}
+
+    table&         x;
+    const_iterator it;
+    bool           rollback_=false;
+  };
+
+  static inline iterator make_iterator(const locator& l)noexcept
+  {
+    return {l.pg,l.n,l.p};
+  }
+
+  template<typename... Args>
+  BOOST_FORCEINLINE std::pair<iterator,bool> emplace_impl(Args&&... args)
+  {
+    const auto &k=this->key_from(std::forward<Args>(args)...);
+    auto        hash=this->hash_for(k);
+    auto        pos0=this->position_for(hash);
+    auto        loc=super::find(k,pos0,hash);
+
+    if(loc){
+      return {make_iterator(loc),false};
+    }
+    if(BOOST_LIKELY(this->size_ctrl.size<this->size_ctrl.ml)){
+      return {
+        make_iterator(
+          this->unchecked_emplace_at(pos0,hash,std::forward<Args>(args)...)),
+        true
+      };  
+    }
+    else{
+      return {
+        make_iterator(
+          this->unchecked_emplace_with_rehash(
+            hash,std::forward<Args>(args)...)),
+        true
+      };  
+    }
+  }
+};
+
+#if defined(BOOST_MSVC)
+#pragma warning(pop) /* C4714 */
+#endif
+
+#include <boost/unordered/detail/foa/restore_wshadow.hpp>
+
+} /* namespace foa */
+} /* namespace detail */
+} /* namespace unordered */
+} /* namespace boost */
+
+#endif

thirdparty/include/boost/unordered/detail/foa/tuple_rotate_right.hpp

@@ -0,0 +1,52 @@
+/* Copyright 2023 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_DETAIL_FOA_TUPLE_ROTATE_RIGHT_HPP
+#define BOOST_UNORDERED_DETAIL_FOA_TUPLE_ROTATE_RIGHT_HPP
+
+#include <boost/mp11/algorithm.hpp>
+#include <boost/mp11/integer_sequence.hpp>
+#include <tuple>
+#include <utility>
+
+namespace boost{
+namespace unordered{
+namespace detail{
+namespace foa{
+
+template<typename Tuple>
+using tuple_rotate_right_return_type=mp11::mp_rotate_right_c<
+  typename std::remove_cv<typename std::remove_reference<Tuple>::type>::type,
+  1
+>;
+
+template<std::size_t... Is,typename Tuple>
+tuple_rotate_right_return_type<Tuple>
+tuple_rotate_right_aux(mp11::index_sequence<Is...>,Tuple&& x)
+{
+  return tuple_rotate_right_return_type<Tuple>{
+    std::get<(Is+sizeof...(Is)-1)%sizeof...(Is)>(std::forward<Tuple>(x))...};
+}
+
+template<typename Tuple>
+tuple_rotate_right_return_type<Tuple> tuple_rotate_right(Tuple&& x)
+{
+  using RawTuple=typename std::remove_cv<
+    typename std::remove_reference<Tuple>::type>::type;
+
+  return tuple_rotate_right_aux(
+    mp11::make_index_sequence<std::tuple_size<RawTuple>::value>{},
+    std::forward<Tuple>(x));
+}
+
+} /* namespace foa */
+} /* namespace detail */
+} /* namespace unordered */
+} /* namespace boost */
+
+#endif

thirdparty/include/boost/unordered/detail/map.hpp

@@ -0,0 +1,61 @@
+
+// Copyright (C) 2005-2016 Daniel James
+// Copyright (C) 2022 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/unordered/detail/implementation.hpp>
+#include <boost/unordered/unordered_map_fwd.hpp>
+
+namespace boost {
+  namespace unordered {
+    namespace detail {
+      template <typename A, typename K, typename M, typename H, typename P>
+      struct map
+      {
+        typedef boost::unordered::detail::map<A, K, M, H, P> types;
+
+        typedef std::pair<K const, M> value_type;
+        typedef H hasher;
+        typedef P key_equal;
+        typedef K const const_key_type;
+
+        typedef
+          typename ::boost::unordered::detail::rebind_wrap<A, value_type>::type
+            value_allocator;
+        typedef boost::unordered::detail::allocator_traits<value_allocator>
+          value_allocator_traits;
+
+        typedef boost::unordered::detail::table<types> table;
+        typedef boost::unordered::detail::map_extractor<value_type> extractor;
+
+        typedef typename boost::allocator_void_pointer<value_allocator>::type
+          void_pointer;
+
+        typedef boost::unordered::node_handle_map<
+          node<value_type, void_pointer>, K, M, A>
+          node_type;
+
+        typedef typename table::iterator iterator;
+        typedef boost::unordered::insert_return_type_map<iterator, node_type> insert_return_type;
+      };
+
+      template <typename K, typename M, typename H, typename P, typename A>
+      class instantiate_map
+      {
+        typedef boost::unordered_map<K, M, H, P, A> container;
+        container x;
+        typename container::node_type node_type;
+        typename container::insert_return_type insert_return_type;
+      };
+
+      template <typename K, typename M, typename H, typename P, typename A>
+      class instantiate_multimap
+      {
+        typedef boost::unordered_multimap<K, M, H, P, A> container;
+        container x;
+        typename container::node_type node_type;
+      };
+    }
+  }
+}

thirdparty/include/boost/unordered/detail/mulx.hpp

@@ -0,0 +1,129 @@
+#ifndef BOOST_UNORDERED_DETAIL_MULX_HPP
+#define BOOST_UNORDERED_DETAIL_MULX_HPP
+
+// Copyright 2022 Peter Dimov.
+// Copyright 2022 Joaquin M Lopez Munoz.
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/cstdint.hpp>
+#include <climits>
+#include <cstddef>
+
+#if defined(_MSC_VER) && !defined(__clang__)
+# include <intrin.h>
+#endif
+
+namespace boost {
+namespace unordered {
+namespace detail {
+
+// Bit mixer based on the mulx primitive
+
+#if defined(_MSC_VER) && defined(_M_X64) && !defined(__clang__)
+
+__forceinline boost::uint64_t mulx64( boost::uint64_t x, boost::uint64_t y )
+{
+    boost::uint64_t r2;
+    boost::uint64_t r = _umul128( x, y, &r2 );
+    return r ^ r2;
+}
+
+#elif defined(_MSC_VER) && defined(_M_ARM64) && !defined(__clang__)
+
+__forceinline boost::uint64_t mulx64( boost::uint64_t x, boost::uint64_t y )
+{
+    boost::uint64_t r = x * y;
+    boost::uint64_t r2 = __umulh( x, y );
+    return r ^ r2;
+}
+
+#elif defined(__SIZEOF_INT128__)
+
+inline boost::uint64_t mulx64( boost::uint64_t x, boost::uint64_t y )
+{
+    __uint128_t r = (__uint128_t)x * y;
+    return (boost::uint64_t)r ^ (boost::uint64_t)( r >> 64 );
+}
+
+#else
+
+inline boost::uint64_t mulx64( boost::uint64_t x, boost::uint64_t y )
+{
+    boost::uint64_t x1 = (boost::uint32_t)x;
+    boost::uint64_t x2 = x >> 32;
+
+    boost::uint64_t y1 = (boost::uint32_t)y;
+    boost::uint64_t y2 = y >> 32;
+
+    boost::uint64_t r3 = x2 * y2;
+
+    boost::uint64_t r2a = x1 * y2;
+
+    r3 += r2a >> 32;
+
+    boost::uint64_t r2b = x2 * y1;
+
+    r3 += r2b >> 32;
+
+    boost::uint64_t r1 = x1 * y1;
+
+    boost::uint64_t r2 = (r1 >> 32) + (boost::uint32_t)r2a + (boost::uint32_t)r2b;
+
+    r1 = (r2 << 32) + (boost::uint32_t)r1;
+    r3 += r2 >> 32;
+
+    return r1 ^ r3;
+}
+
+#endif
+
+inline boost::uint32_t mulx32( boost::uint32_t x, boost::uint32_t y )
+{
+    boost::uint64_t r = (boost::uint64_t)x * y;
+
+#if defined(__MSVC_RUNTIME_CHECKS)
+
+    return (boost::uint32_t)(r & UINT32_MAX) ^ (boost::uint32_t)(r >> 32);
+
+#else
+
+    return (boost::uint32_t)r ^ (boost::uint32_t)(r >> 32);
+
+#endif
+}
+
+#if defined(SIZE_MAX)
+#if ((((SIZE_MAX >> 16) >> 16) >> 16) >> 15) != 0
+#define BOOST_UNORDERED_64B_ARCHITECTURE /* >64 bits assumed as 64 bits */
+#endif
+#elif defined(UINTPTR_MAX) /* used as proxy for std::size_t */
+#if ((((UINTPTR_MAX >> 16) >> 16) >> 16) >> 15) != 0
+#define BOOST_UNORDERED_64B_ARCHITECTURE
+#endif
+#endif
+
+inline std::size_t mulx( std::size_t x ) noexcept
+{
+#if defined(BOOST_UNORDERED_64B_ARCHITECTURE)
+
+    // multiplier is phi
+    return (std::size_t)mulx64( (boost::uint64_t)x, 0x9E3779B97F4A7C15ull );
+
+#else /* 32 bits assumed */
+
+    // multiplier from https://arxiv.org/abs/2001.05304
+    return mulx32( x, 0xE817FB2Du );
+
+#endif
+}
+
+#ifdef BOOST_UNORDERED_64B_ARCHITECTURE
+#undef BOOST_UNORDERED_64B_ARCHITECTURE
+#endif
+
+} // namespace detail
+} // namespace unordered
+} // namespace boost
+
+#endif // #ifndef BOOST_UNORDERED_DETAIL_MULX_HPP

thirdparty/include/boost/unordered/detail/narrow_cast.hpp

@@ -0,0 +1,44 @@
+/* Copyright 2022 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_DETAIL_NARROW_CAST_HPP
+#define BOOST_UNORDERED_DETAIL_NARROW_CAST_HPP
+
+#include <boost/unordered/detail/static_assert.hpp>
+
+#include <boost/config.hpp>
+#include <type_traits>
+
+namespace boost{
+namespace unordered{
+namespace detail{
+
+template<typename To,typename From>
+constexpr To narrow_cast(From x) noexcept
+{
+  BOOST_UNORDERED_STATIC_ASSERT(std::is_integral<From>::value);
+  BOOST_UNORDERED_STATIC_ASSERT(std::is_integral<To>::value);
+  BOOST_UNORDERED_STATIC_ASSERT(sizeof(From)>=sizeof(To));
+
+  return static_cast<To>(
+    x
+
+#if defined(__MSVC_RUNTIME_CHECKS)
+    /* Avoids VS's "Run-Time Check Failure #1 - A cast to a smaller data type
+     * has caused a loss of data."
+     */
+    &static_cast<typename std::make_unsigned<To>::type>(~static_cast<To>(0))
+#endif
+  );
+}
+
+} /* namespace detail */
+} /* namespace unordered */
+} /* namespace boost */
+
+#endif

thirdparty/include/boost/unordered/detail/opt_storage.hpp

@@ -0,0 +1,30 @@
+// Copyright (C) 2023 Christian Mazakas
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_DETAIL_OPT_STORAGE_HPP
+#define BOOST_UNORDERED_DETAIL_OPT_STORAGE_HPP
+
+#include <boost/config.hpp>
+
+#include <memory>
+
+namespace boost {
+  namespace unordered {
+    namespace detail {
+      template <class T> union opt_storage
+      {
+        BOOST_ATTRIBUTE_NO_UNIQUE_ADDRESS T t_;
+
+        opt_storage() {}
+        ~opt_storage() {}
+
+        T* address() noexcept { return std::addressof(t_); }
+        T const* address() const noexcept { return std::addressof(t_); }
+      };
+    } // namespace detail
+  } // namespace unordered
+} // namespace boost
+
+#endif // BOOST_UNORDERED_DETAIL_OPT_STORAGE_HPP

thirdparty/include/boost/unordered/detail/prime_fmod.hpp

@@ -0,0 +1,214 @@
+// Copyright (C) 2022 Joaquin M Lopez Munoz.
+// Copyright (C) 2022-2023 Christian Mazakas
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_DETAIL_PRIME_FMOD_HPP
+#define BOOST_UNORDERED_DETAIL_PRIME_FMOD_HPP
+
+#include <boost/unordered/detail/narrow_cast.hpp>
+
+#include <boost/config.hpp>
+#include <boost/cstdint.hpp>
+
+#include <climits>
+#include <cstddef>
+
+#if defined(SIZE_MAX)
+#if ((((SIZE_MAX >> 16) >> 16) >> 16) >> 15) != 0
+#define BOOST_UNORDERED_FCA_HAS_64B_SIZE_T
+#endif
+#elif defined(UINTPTR_MAX) /* used as proxy for std::size_t */
+#if ((((UINTPTR_MAX >> 16) >> 16) >> 16) >> 15) != 0
+#define BOOST_UNORDERED_FCA_HAS_64B_SIZE_T
+#endif
+#endif
+
+#if defined(BOOST_UNORDERED_FCA_HAS_64B_SIZE_T) && defined(_MSC_VER)
+#include <intrin.h>
+#endif
+
+namespace boost {
+  namespace unordered {
+    namespace detail {
+      template <class = void> struct prime_fmod_size
+      {
+        constexpr static std::size_t const sizes[] = {13ul, 29ul, 53ul, 97ul,
+          193ul, 389ul, 769ul, 1543ul, 3079ul, 6151ul, 12289ul, 24593ul,
+          49157ul, 98317ul, 196613ul, 393241ul, 786433ul, 1572869ul, 3145739ul,
+          6291469ul, 12582917ul, 25165843ul, 50331653ul, 100663319ul,
+          201326611ul, 402653189ul, 805306457ul, 1610612741ul, 3221225473ul,
+#if !defined(BOOST_UNORDERED_FCA_HAS_64B_SIZE_T)
+          4294967291ul
+#else
+          6442450939ull, 12884901893ull, 25769803751ull, 51539607551ull,
+          103079215111ull, 206158430209ull, 412316860441ull, 824633720831ull,
+          1649267441651ull
+#endif
+        };
+
+        constexpr static std::size_t const sizes_len =
+          sizeof(sizes) / sizeof(sizes[0]);
+
+#if defined(BOOST_UNORDERED_FCA_HAS_64B_SIZE_T)
+        constexpr static boost::uint64_t const inv_sizes32[] = {
+          1418980313362273202ull, 636094623231363849ull, 348051774975651918ull,
+          190172619316593316ull, 95578984837873325ull, 47420935922132524ull,
+          23987963684927896ull, 11955116055547344ull, 5991147799191151ull,
+          2998982941588287ull, 1501077717772769ull, 750081082979285ull,
+          375261795343686ull, 187625172388393ull, 93822606204624ull,
+          46909513691883ull, 23456218233098ull, 11728086747027ull,
+          5864041509391ull, 2932024948977ull, 1466014921160ull, 733007198436ull,
+          366503839517ull, 183251896093ull, 91625960335ull, 45812983922ull,
+          22906489714ull, 11453246088ull, 5726623060ull};
+
+        constexpr static std::size_t const inv_sizes32_len =
+          sizeof(inv_sizes32) / sizeof(inv_sizes32[0]);
+#endif /* defined(BOOST_UNORDERED_FCA_HAS_64B_SIZE_T) */
+
+        template <std::size_t SizeIndex, std::size_t Size = sizes[SizeIndex]>
+        static std::size_t position(std::size_t hash)
+        {
+          return hash % Size;
+        }
+
+        constexpr static std::size_t (*positions[])(std::size_t) = {
+#if !defined(BOOST_UNORDERED_FCA_HAS_64B_SIZE_T)
+          position<0, sizes[0]>,
+          position<1, sizes[1]>,
+          position<2, sizes[2]>,
+          position<3, sizes[3]>,
+          position<4, sizes[4]>,
+          position<5, sizes[5]>,
+          position<6, sizes[6]>,
+          position<7, sizes[7]>,
+          position<8, sizes[8]>,
+          position<9, sizes[9]>,
+          position<10, sizes[10]>,
+          position<11, sizes[11]>,
+          position<12, sizes[12]>,
+          position<13, sizes[13]>,
+          position<14, sizes[14]>,
+          position<15, sizes[15]>,
+          position<16, sizes[16]>,
+          position<17, sizes[17]>,
+          position<18, sizes[18]>,
+          position<19, sizes[19]>,
+          position<20, sizes[20]>,
+          position<21, sizes[21]>,
+          position<22, sizes[22]>,
+          position<23, sizes[23]>,
+          position<24, sizes[24]>,
+          position<25, sizes[25]>,
+          position<26, sizes[26]>,
+          position<27, sizes[27]>,
+          position<28, sizes[28]>,
+          position<29, sizes[29]>,
+#else
+          position<29, sizes[29]>,
+          position<30, sizes[30]>,
+          position<31, sizes[31]>,
+          position<32, sizes[32]>,
+          position<33, sizes[33]>,
+          position<34, sizes[34]>,
+          position<35, sizes[35]>,
+          position<36, sizes[36]>,
+          position<37, sizes[37]>,
+#endif
+        };
+
+        static inline std::size_t size_index(std::size_t n)
+        {
+          std::size_t i = 0;
+          for (; i < (sizes_len - 1); ++i) {
+            if (sizes[i] >= n) {
+              break;
+            }
+          }
+          return i;
+        }
+
+        static inline std::size_t size(std::size_t size_index)
+        {
+          return sizes[size_index];
+        }
+
+#if defined(BOOST_UNORDERED_FCA_HAS_64B_SIZE_T)
+        // We emulate the techniques taken from:
+        // Faster Remainder by Direct Computation: Applications to Compilers and
+        // Software Libraries
+        // https://arxiv.org/abs/1902.01961
+        //
+        // In essence, use fancy math to directly calculate the remainder (aka
+        // modulo) exploiting how compilers transform division
+        //
+
+        static inline boost::uint64_t get_remainder(
+          boost::uint64_t fractional, boost::uint32_t d)
+        {
+#if defined(_MSC_VER)
+          // use MSVC intrinsics when available to avoid promotion to 128 bits
+
+          return __umulh(fractional, d);
+#elif defined(BOOST_HAS_INT128)
+          return static_cast<boost::uint64_t>(
+            ((boost::uint128_type)fractional * d) >> 64);
+#else
+          // portable implementation in the absence of boost::uint128_type on 64
+          // bits, which happens at least in GCC 4.5 and prior
+
+          boost::uint64_t r1 = (fractional & UINT32_MAX) * d;
+          boost::uint64_t r2 = (fractional >> 32) * d;
+          r2 += r1 >> 32;
+          return r2 >> 32;
+#endif /* defined(_MSC_VER) */
+        }
+
+        static inline boost::uint32_t fast_modulo(
+          boost::uint32_t a, boost::uint64_t M, boost::uint32_t d)
+        {
+          boost::uint64_t fractional = M * a;
+          return (boost::uint32_t)(get_remainder(fractional, d));
+        }
+#endif /* defined(BOOST_UNORDERED_FCA_HAS_64B_SIZE_T) */
+
+        static inline std::size_t position(
+          std::size_t hash, std::size_t size_index)
+        {
+#if defined(BOOST_UNORDERED_FCA_HAS_64B_SIZE_T)
+          std::size_t sizes_under_32bit = inv_sizes32_len;
+          if (BOOST_LIKELY(size_index < sizes_under_32bit)) {
+            return fast_modulo(narrow_cast<boost::uint32_t>(hash) +
+                                 narrow_cast<boost::uint32_t>(hash >> 32),
+              inv_sizes32[size_index], boost::uint32_t(sizes[size_index]));
+          } else {
+            return positions[size_index - sizes_under_32bit](hash);
+          }
+#else
+          return positions[size_index](hash);
+#endif /* defined(BOOST_UNORDERED_FCA_HAS_64B_SIZE_T) */
+        }
+      }; // prime_fmod_size
+
+#if defined(BOOST_NO_CXX17_INLINE_VARIABLES)
+      // https://en.cppreference.com/w/cpp/language/static#Constant_static_members
+      // If a const non-inline (since C++17) static data member or a constexpr
+      // static data member (since C++11)(until C++17) is odr-used, a definition
+      // at namespace scope is still required, but it cannot have an
+      // initializer.
+      template <class T> constexpr std::size_t prime_fmod_size<T>::sizes[];
+
+#if defined(BOOST_UNORDERED_FCA_HAS_64B_SIZE_T)
+      template <class T>
+      constexpr boost::uint64_t prime_fmod_size<T>::inv_sizes32[];
+#endif
+
+      template <class T>
+      constexpr std::size_t (*prime_fmod_size<T>::positions[])(std::size_t);
+#endif
+    } // namespace detail
+  } // namespace unordered
+} // namespace boost
+
+#endif // BOOST_UNORDERED_DETAIL_PRIME_FMOD_HPP

thirdparty/include/boost/unordered/detail/serialization_version.hpp

@@ -0,0 +1,74 @@
+/* Copyright 2023 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_DETAIL_SERIALIZATION_VERSION_HPP
+#define BOOST_UNORDERED_DETAIL_SERIALIZATION_VERSION_HPP
+
+#include <boost/config.hpp>
+#include <boost/core/serialization.hpp>
+
+namespace boost{
+namespace unordered{
+namespace detail{
+
+/* boost::serialization::load_construct_adl(ar,t,version) requires user code
+ * to pass the serialization version for t, when this information is really
+ * stored in the archive. serialization_version<T> circumvents this design
+ * error by acting as a regular serializable type with the same serialization
+ * version as T; loading/saving serialization_version<T> does nothing with
+ * the archive data itself but captures the stored serialization version
+ * at load() time.
+ */
+
+template<typename T>
+struct serialization_version
+{
+  serialization_version():
+    value(boost::serialization::version<serialization_version>::value){}
+
+  serialization_version& operator=(unsigned int x){value=x;return *this;};
+
+  operator unsigned int()const{return value;}
+
+private:
+  friend class boost::serialization::access;
+
+  template<class Archive>
+  void serialize(Archive& ar,unsigned int version)
+  {
+    core::split_member(ar,*this,version);
+  }
+
+  template<class Archive>
+  void save(Archive&,unsigned int)const{}
+
+  template<class Archive>
+  void load(Archive&,unsigned int version)
+  {
+    this->value=version;
+  }
+
+  unsigned int value;
+};
+
+} /* namespace detail */
+} /* namespace unordered */
+
+namespace serialization{
+
+template<typename T>
+struct version<boost::unordered::detail::serialization_version<T> >
+{
+  BOOST_STATIC_CONSTANT(int,value=version<T>::value);
+};
+
+} /* namespace serialization */
+
+} /* namespace boost */
+
+#endif

thirdparty/include/boost/unordered/detail/serialize_container.hpp

@@ -0,0 +1,204 @@
+/* Copyright 2023 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_DETAIL_SERIALIZE_CONTAINER_HPP
+#define BOOST_UNORDERED_DETAIL_SERIALIZE_CONTAINER_HPP
+
+#include <boost/core/serialization.hpp>
+#include <boost/throw_exception.hpp>
+#include <boost/unordered/detail/archive_constructed.hpp>
+#include <boost/unordered/detail/bad_archive_exception.hpp>
+#include <boost/unordered/detail/serialization_version.hpp>
+#include <cstddef>
+
+namespace boost{
+namespace unordered{
+namespace detail{
+
+/* serialize_container(ar,x,v) serializes any of the unordered associative
+ * containers in Boost.Unordered. Iterator serialization is also supported
+ * through the following protocol: 
+ *  - At saving time, for each iterator it in [x.begin(),x.end()),
+ *    serialization_track(ar,it) is ADL-called to instruct the archive to
+ *    track the positions internally pointed to by the iterator via
+ *    track_address().
+ *  - At loading time, these addresses are mapped to those of the equivalent
+ *    reconstructed positions using again serialization_track(ar,it).
+ *  - Serializing an iterator reduces to serializing pointers to previously
+ *    tracked addresses via serialize_address().
+ */
+
+template<typename Iterator>
+std::pair<Iterator,bool> adapt_insert_return_type(Iterator it)
+{
+  return std::pair<Iterator,bool>(it,true);
+}
+
+template<typename Iterator>
+std::pair<Iterator,bool> adapt_insert_return_type(std::pair<Iterator,bool> p)
+{
+  return p;
+}
+
+template<typename Set,bool IsSaving> struct load_or_save_unordered_set;
+
+template<typename Set> struct load_or_save_unordered_set<Set,true> /* save */
+{
+  template<typename Archive>
+  void operator()(Archive& ar,const Set& x,unsigned int)const
+  {
+    typedef typename Set::value_type     value_type;
+    typedef typename Set::const_iterator const_iterator;
+
+    const std::size_t                       s=x.size();
+    const serialization_version<value_type> value_version;
+
+    ar<<core::make_nvp("count",s);
+    ar<<core::make_nvp("value_version",value_version);
+
+    for(const_iterator first=x.begin(),last=x.end();first!=last;++first){
+      core::save_construct_data_adl(ar,std::addressof(*first),value_version);
+      ar<<core::make_nvp("item",*first);
+      serialization_track(ar,first);
+    }
+  }
+};
+
+template<typename Set> struct load_or_save_unordered_set<Set,false> /* load */
+{
+  template<typename Archive>
+  void operator()(Archive& ar,Set& x,unsigned int)const
+  {
+    typedef typename Set::value_type value_type;
+    typedef typename Set::iterator   iterator;
+
+    std::size_t                       s;
+    serialization_version<value_type> value_version;
+
+    ar>>core::make_nvp("count",s);
+    ar>>core::make_nvp("value_version",value_version);
+
+    x.clear();
+    x.reserve(s); /* critical so that iterator tracking is stable */
+
+    for(std::size_t n=0;n<s;++n){
+      archive_constructed<value_type> value("item",ar,value_version);
+
+      std::pair<iterator,bool> p=adapt_insert_return_type(
+        x.insert(std::move(value.get())));
+      if(!p.second)throw_exception(bad_archive_exception());
+      ar.reset_object_address(
+        std::addressof(*p.first),std::addressof(value.get()));
+      serialization_track(ar,p.first);
+    }
+  }
+};
+
+template<typename Map,bool IsSaving> struct load_or_save_unordered_map;
+
+template<typename Map> struct load_or_save_unordered_map<Map,true> /* save */
+{
+  template<typename Archive>
+  void operator()(Archive& ar,const Map& x,unsigned int)const
+  {
+    typedef typename std::remove_const<
+      typename Map::key_type>::type       key_type;
+    typedef typename std::remove_const<
+      typename Map::mapped_type>::type    mapped_type;
+    typedef typename Map::const_iterator  const_iterator;
+
+    const std::size_t                        s=x.size();
+    const serialization_version<key_type>    key_version;
+    const serialization_version<mapped_type> mapped_version;
+
+    ar<<core::make_nvp("count",s);
+    ar<<core::make_nvp("key_version",key_version);
+    ar<<core::make_nvp("mapped_version",mapped_version);
+
+    for(const_iterator first=x.begin(),last=x.end();first!=last;++first){
+      /* To remain lib-independent from Boost.Serialization and not rely on
+       * the user having included the serialization code for std::pair
+       * (boost/serialization/utility.hpp), we serialize the key and the
+       * mapped value separately.
+       */
+
+      core::save_construct_data_adl(
+        ar,std::addressof(first->first),key_version);
+      ar<<core::make_nvp("key",first->first);
+      core::save_construct_data_adl(
+        ar,std::addressof(first->second),mapped_version);
+      ar<<core::make_nvp("mapped",first->second);
+      serialization_track(ar,first);
+    }
+  }
+};
+
+template<typename Map> struct load_or_save_unordered_map<Map,false> /* load */
+{
+  template<typename Archive>
+  void operator()(Archive& ar,Map& x,unsigned int)const
+  {
+    typedef typename std::remove_const<
+      typename Map::key_type>::type       key_type;
+    typedef typename std::remove_const<
+      typename Map::mapped_type>::type    mapped_type;
+    typedef typename Map::iterator        iterator;
+
+    std::size_t                        s;
+    serialization_version<key_type>    key_version;
+    serialization_version<mapped_type> mapped_version;
+
+    ar>>core::make_nvp("count",s);
+    ar>>core::make_nvp("key_version",key_version);
+    ar>>core::make_nvp("mapped_version",mapped_version);
+
+    x.clear();
+    x.reserve(s); /* critical so that iterator tracking is stable */
+
+    for(std::size_t n=0;n<s;++n){
+      archive_constructed<key_type>    key("key",ar,key_version);
+      archive_constructed<mapped_type> mapped("mapped",ar,mapped_version);
+
+      std::pair<iterator,bool> p=adapt_insert_return_type(
+        x.emplace(std::move(key.get()),std::move(mapped.get())));
+      if(!p.second)throw_exception(bad_archive_exception());
+      ar.reset_object_address(
+        std::addressof(p.first->first),std::addressof(key.get()));
+      ar.reset_object_address(
+        std::addressof(p.first->second),std::addressof(mapped.get()));
+      serialization_track(ar,p.first);
+    }
+  }
+};
+
+template<typename Container,bool IsSet,bool IsSaving>
+struct load_or_save_container;
+  
+template<typename Set,bool IsSaving>
+struct load_or_save_container<Set,true,IsSaving>:
+  load_or_save_unordered_set<Set,IsSaving>{};
+
+template<typename Map,bool IsSaving>
+struct load_or_save_container<Map,false,IsSaving>:
+  load_or_save_unordered_map<Map,IsSaving>{};
+
+template<typename Archive,typename Container>
+void serialize_container(Archive& ar,Container& x,unsigned int version)
+{
+  load_or_save_container<
+    Container,
+    std::is_same<
+      typename Container::key_type,typename Container::value_type>::value,
+    Archive::is_saving::value>()(ar,x,version);
+}
+
+} /* namespace detail */
+} /* namespace unordered */
+} /* namespace boost */
+
+#endif

thirdparty/include/boost/unordered/detail/serialize_fca_container.hpp

@@ -0,0 +1,156 @@
+/* Copyright 2023 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_DETAIL_SERIALIZE_FCA_CONTAINER_HPP
+#define BOOST_UNORDERED_DETAIL_SERIALIZE_FCA_CONTAINER_HPP
+
+#include <boost/unordered/detail/serialize_container.hpp>
+
+#if defined(BOOST_UNORDERED_ENABLE_SERIALIZATION_COMPATIBILITY_V0)
+
+#define BOOST_UNORDERED_BLOCK_BOOSTDEP_HEADER \
+  <boost/serialization/archive_input_unordered_map.hpp>
+#include BOOST_UNORDERED_BLOCK_BOOSTDEP_HEADER
+#undef BOOST_UNORDERED_BLOCK_BOOSTDEP_HEADER
+#define BOOST_UNORDERED_BLOCK_BOOSTDEP_HEADER \
+  <boost/serialization/archive_input_unordered_set.hpp>
+#include BOOST_UNORDERED_BLOCK_BOOSTDEP_HEADER
+#undef BOOST_UNORDERED_BLOCK_BOOSTDEP_HEADER
+#define BOOST_UNORDERED_BLOCK_BOOSTDEP_HEADER \
+  <boost/serialization/unordered_collections_load_imp.hpp>
+#include BOOST_UNORDERED_BLOCK_BOOSTDEP_HEADER
+#undef BOOST_UNORDERED_BLOCK_BOOSTDEP_HEADER
+#define BOOST_UNORDERED_BLOCK_BOOSTDEP_HEADER \
+  <boost/serialization/utility.hpp>
+#include BOOST_UNORDERED_BLOCK_BOOSTDEP_HEADER
+#undef BOOST_UNORDERED_BLOCK_BOOSTDEP_HEADER
+
+#include <boost/unordered/unordered_map_fwd.hpp>
+#include <boost/unordered/unordered_set_fwd.hpp>
+
+#else
+
+#include <boost/throw_exception.hpp>
+#include <stdexcept>
+
+#endif
+
+namespace boost{
+namespace unordered{
+namespace detail{
+
+/* Support for boost::unordered_[multi](map|set) loading from legacy archives.
+ * Until Boost 1.84, serialization of these containers was provided from
+ * Boost.Serialization via boost/serialization/boost_unordered_(map|set).hpp,
+ * from that release on support is native in Boost.Unordered. To enable legacy
+ * archive loading, BOOST_UNORDERED_ENABLE_SERIALIZATION_COMPATIBILITY_V0
+ * must be defined (it implies header dependency from Boost.Serialization).
+ */
+
+#if defined(BOOST_UNORDERED_ENABLE_SERIALIZATION_COMPATIBILITY_V0)
+
+template<typename Archive,typename Container>
+struct archive_input;
+
+template<
+  typename Archive,typename K,typename T,typename H,typename P,typename A
+>
+struct archive_input<Archive,boost::unordered_map<K,T,H,P,A> >:
+  boost::serialization::stl::archive_input_unordered_map<
+    Archive,
+    boost::unordered_map<K,T,H,P,A>
+  >
+{};
+
+template<
+  typename Archive,typename K,typename T,typename H,typename P,typename A
+>
+struct archive_input<Archive,boost::unordered_multimap<K,T,H,P,A> >:
+  boost::serialization::stl::archive_input_unordered_multimap<
+    Archive,
+    boost::unordered_multimap<K,T,H,P,A>
+  >
+{};
+
+template<
+  typename Archive,typename K,typename H,typename P,typename A
+>
+struct archive_input<Archive,boost::unordered_set<K,H,P,A> >:
+  boost::serialization::stl::archive_input_unordered_set<
+    Archive,
+    boost::unordered_set<K,H,P,A>
+  >
+{};
+
+template<
+  typename Archive,typename K,typename H,typename P,typename A
+>
+struct archive_input<Archive,boost::unordered_multiset<K,H,P,A> >:
+  boost::serialization::stl::archive_input_unordered_multiset<
+    Archive,
+    boost::unordered_multiset<K,H,P,A>
+  >
+{};
+
+#else
+
+struct legacy_archive_exception:std::runtime_error
+{
+  legacy_archive_exception():std::runtime_error(
+    "Legacy archive detected, define "
+    "BOOST_UNORDERED_ENABLE_SERIALIZATION_COMPATIBILITY_V0 to load"){}
+};
+
+#endif
+
+template<typename Container,bool IsSaving>
+struct load_or_save_fca_container;
+
+template<typename Container>
+struct load_or_save_fca_container<Container,true> /* save */
+{
+  template<typename Archive>
+  void operator()(Archive& ar,Container& x,unsigned int version)const
+  {
+    serialize_container(ar,x,version);
+  }
+};
+
+template<typename Container>
+struct load_or_save_fca_container<Container,false> /* load */
+{
+  template<typename Archive>
+  void operator()(Archive& ar,Container& x,unsigned int version)const
+  {
+    if(version==0){
+#if defined(BOOST_UNORDERED_ENABLE_SERIALIZATION_COMPATIBILITY_V0)
+      boost::serialization::stl::load_unordered_collection<
+        Archive,Container,archive_input<Archive,Container>
+      >(ar,x);
+#else
+      throw_exception(legacy_archive_exception());
+#endif
+    }
+    else{
+      serialize_container(ar,x,version);
+    }
+  }
+};
+
+template<typename Archive,typename Container>
+void serialize_fca_container(Archive& ar,Container& x,unsigned int version)
+{
+  load_or_save_fca_container<Container,Archive::is_saving::value>()(
+    ar,x,version);
+}
+
+} /* namespace detail */
+} /* namespace unordered */
+} /* namespace boost */
+
+#endif

thirdparty/include/boost/unordered/detail/serialize_tracked_address.hpp

@@ -0,0 +1,104 @@
+/* Copyright 2023 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_DETAIL_SERIALIZE_TRACKED_ADDRESS_HPP
+#define BOOST_UNORDERED_DETAIL_SERIALIZE_TRACKED_ADDRESS_HPP
+
+#include <boost/unordered/detail/bad_archive_exception.hpp>
+
+#include <boost/core/pointer_traits.hpp>
+#include <boost/core/serialization.hpp>
+#include <boost/throw_exception.hpp>
+
+#include <type_traits>
+
+namespace boost{
+namespace unordered{
+namespace detail{
+
+/* Tracked address serialization to support iterator serialization as described
+ * in serialize_container.hpp. The underlying technique is to reinterpret_cast
+ * T pointers to serialization_tracker<T> pointers, which, when dereferenced
+ * and serialized, do not emit any serialization payload to the
+ * archive, but activate object tracking on the relevant addresses for later
+ * use with serialize_tracked_address().
+ */
+
+template<typename T>
+struct serialization_tracker
+{
+  /* An attempt to construct a serialization_tracker means a stray address
+   * in the archive, that is, one without a previously tracked address.
+   */
+  serialization_tracker(){throw_exception(bad_archive_exception());}
+
+  template<typename Archive>
+  void serialize(Archive&,unsigned int){} /* no data emitted */
+};
+
+template<typename Archive,typename Ptr>
+void track_address(Archive& ar,Ptr p)
+{
+  typedef typename boost::pointer_traits<Ptr> ptr_traits;
+  typedef typename std::remove_const<
+    typename ptr_traits::element_type>::type  element_type;
+
+  if(p){
+    ar&core::make_nvp(
+      "address",
+      *reinterpret_cast<serialization_tracker<element_type>*>(
+        const_cast<element_type*>(
+          boost::to_address(p))));
+  }
+}
+
+template<typename Archive,typename Ptr>
+void serialize_tracked_address(Archive& ar,Ptr& p,std::true_type /* save */)
+{
+  typedef typename boost::pointer_traits<Ptr> ptr_traits;
+  typedef typename std::remove_const<
+    typename ptr_traits::element_type>::type  element_type;
+  typedef serialization_tracker<element_type> tracker;
+
+  tracker* pt=
+    const_cast<tracker*>(
+      reinterpret_cast<const tracker*>(
+        const_cast<const element_type*>(
+          boost::to_address(p))));
+  ar<<core::make_nvp("pointer",pt);
+}
+
+template<typename Archive,typename Ptr>
+void serialize_tracked_address(Archive& ar,Ptr& p,std::false_type /* load */)
+{
+  typedef typename boost::pointer_traits<Ptr> ptr_traits;
+  typedef typename std::remove_const<
+    typename ptr_traits::element_type>::type  element_type;
+  typedef serialization_tracker<element_type> tracker;
+
+  tracker* pt;
+  ar>>core::make_nvp("pointer",pt);
+  element_type* pn=const_cast<element_type*>(
+    reinterpret_cast<const element_type*>(
+      const_cast<const tracker*>(pt)));
+  p=pn?ptr_traits::pointer_to(*pn):0;
+}
+
+template<typename Archive,typename Ptr>
+void serialize_tracked_address(Archive& ar,Ptr& p)
+{
+  serialize_tracked_address(
+    ar,p,
+    std::integral_constant<bool,Archive::is_saving::value>());
+}
+
+} /* namespace detail */
+} /* namespace unordered */
+} /* namespace boost */
+
+#endif

thirdparty/include/boost/unordered/detail/set.hpp

@@ -0,0 +1,61 @@
+
+// Copyright (C) 2005-2016 Daniel James
+// Copyright (C) 2022 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/unordered/detail/implementation.hpp>
+#include <boost/unordered/unordered_set_fwd.hpp>
+
+namespace boost {
+  namespace unordered {
+    namespace detail {
+      template <typename A, typename T, typename H, typename P> struct set
+      {
+        typedef boost::unordered::detail::set<A, T, H, P> types;
+
+        typedef T value_type;
+        typedef H hasher;
+        typedef P key_equal;
+        typedef T const const_key_type;
+
+        typedef
+          typename ::boost::unordered::detail::rebind_wrap<A, value_type>::type
+            value_allocator;
+        typedef boost::unordered::detail::allocator_traits<value_allocator>
+          value_allocator_traits;
+
+        typedef boost::unordered::detail::table<types> table;
+        typedef boost::unordered::detail::set_extractor<value_type> extractor;
+
+        typedef typename boost::allocator_void_pointer<value_allocator>::type
+          void_pointer;
+
+        typedef boost::unordered::node_handle_set<
+          node<value_type, void_pointer>, T, A>
+          node_type;
+
+        typedef typename table::c_iterator iterator;
+        typedef boost::unordered::insert_return_type_set<iterator, node_type>
+          insert_return_type;
+      };
+
+      template <typename T, typename H, typename P, typename A>
+      class instantiate_set
+      {
+        typedef boost::unordered_set<T, H, P, A> container;
+        container x;
+        typename container::node_type node_type;
+        typename container::insert_return_type insert_return_type;
+      };
+
+      template <typename T, typename H, typename P, typename A>
+      class instantiate_multiset
+      {
+        typedef boost::unordered_multiset<T, H, P, A> container;
+        container x;
+        typename container::node_type node_type;
+      };
+    }
+  }
+}

thirdparty/include/boost/unordered/detail/static_assert.hpp

@@ -0,0 +1,16 @@
+// Copyright 2023 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_DETAIL_STATIC_ASSERT_HPP
+#define BOOST_UNORDERED_DETAIL_STATIC_ASSERT_HPP
+
+#include <boost/config.hpp>
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#define BOOST_UNORDERED_STATIC_ASSERT(...)                                     \
+  static_assert(__VA_ARGS__, #__VA_ARGS__)
+
+#endif // BOOST_UNORDERED_DETAIL_STATIC_ASSERT_HPP

thirdparty/include/boost/unordered/detail/type_traits.hpp

@@ -0,0 +1,194 @@
+// Copyright (C) 2022-2023 Christian Mazakas
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_DETAIL_TYPE_TRAITS_HPP
+#define BOOST_UNORDERED_DETAIL_TYPE_TRAITS_HPP
+
+#include <boost/config.hpp>
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <boost/config/workaround.hpp>
+
+#if !defined(BOOST_NO_CXX17_DEDUCTION_GUIDES)
+#include <iterator>
+#endif
+
+#include <type_traits>
+#include <utility>
+
+// BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
+
+#if !defined(BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES)
+#if !defined(BOOST_NO_CXX17_DEDUCTION_GUIDES)
+#define BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES 1
+#endif
+#endif
+
+#if !defined(BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES)
+#define BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES 0
+#endif
+
+namespace boost {
+  namespace unordered {
+    namespace detail {
+
+      template <class T> struct type_identity
+      {
+        using type = T;
+      };
+
+      template <typename... Ts> struct make_void
+      {
+        typedef void type;
+      };
+
+      template <typename... Ts> using void_t = typename make_void<Ts...>::type;
+
+#if BOOST_WORKAROUND(BOOST_LIBSTDCXX_VERSION, < 50000)
+      /* std::is_trivially_default_constructible not provided */
+      template <class T>
+      struct is_trivially_default_constructible
+          : public std::integral_constant<bool,
+              std::is_default_constructible<T>::value &&
+                std::has_trivial_default_constructor<T>::value>
+      {
+      };
+#else
+      using std::is_trivially_default_constructible;
+#endif
+
+#if BOOST_WORKAROUND(BOOST_LIBSTDCXX_VERSION, < 50000)
+      /* std::is_trivially_copy_constructible not provided */
+      template <class T>
+      struct is_trivially_copy_constructible
+          : public std::integral_constant<bool,
+              std::is_copy_constructible<T>::value &&
+                std::has_trivial_copy_constructor<T>::value>
+      {
+      };
+#else
+      using std::is_trivially_copy_constructible;
+#endif
+
+#if BOOST_WORKAROUND(BOOST_LIBSTDCXX_VERSION, < 50000)
+      /* std::is_trivially_copy_assignable not provided */
+      template <class T>
+      struct is_trivially_copy_assignable
+          : public std::integral_constant<bool,
+              std::is_copy_assignable<T>::value &&
+                std::has_trivial_copy_assign<T>::value>
+      {
+      };
+#else
+      using std::is_trivially_copy_assignable;
+#endif
+
+      namespace type_traits_detail {
+        using std::swap;
+
+        template <class T, class = void> struct is_nothrow_swappable_helper
+        {
+          constexpr static bool const value = false;
+        };
+
+        template <class T>
+        struct is_nothrow_swappable_helper<T,
+          void_t<decltype(swap(std::declval<T&>(), std::declval<T&>()))> >
+        {
+          constexpr static bool const value =
+            noexcept(swap(std::declval<T&>(), std::declval<T&>()));
+        };
+
+      } // namespace type_traits_detail
+
+      template <class T>
+      struct is_nothrow_swappable
+          : public std::integral_constant<bool,
+              type_traits_detail::is_nothrow_swappable_helper<T>::value>
+      {
+      };
+
+      ////////////////////////////////////////////////////////////////////////////
+      // Type checkers used for the transparent member functions added by C++20
+      // and up
+
+      template <class, class = void>
+      struct is_transparent : public std::false_type
+      {
+      };
+
+      template <class T>
+      struct is_transparent<T,
+        boost::unordered::detail::void_t<typename T::is_transparent> >
+          : public std::true_type
+      {
+      };
+
+      template <class, class Hash, class KeyEqual> struct are_transparent
+      {
+        static bool const value =
+          is_transparent<Hash>::value && is_transparent<KeyEqual>::value;
+      };
+
+      template <class Key, class UnorderedMap> struct transparent_non_iterable
+      {
+        typedef typename UnorderedMap::hasher hash;
+        typedef typename UnorderedMap::key_equal key_equal;
+        typedef typename UnorderedMap::iterator iterator;
+        typedef typename UnorderedMap::const_iterator const_iterator;
+
+        static bool const value =
+          are_transparent<Key, hash, key_equal>::value &&
+          !std::is_convertible<Key, iterator>::value &&
+          !std::is_convertible<Key, const_iterator>::value;
+      };
+
+#if BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
+      // https://eel.is/c++draft/container.requirements#container.alloc.reqmts-34
+      // https://eel.is/c++draft/container.requirements#unord.req.general-243
+
+      template <class InputIterator>
+      constexpr bool const is_input_iterator_v =
+        !std::is_integral<InputIterator>::value;
+
+      template <class A, class = void> struct is_allocator
+      {
+        constexpr static bool const value = false;
+      };
+
+      template <class A>
+      struct is_allocator<A,
+        boost::unordered::detail::void_t<typename A::value_type,
+          decltype(std::declval<A&>().allocate(std::size_t{}))> >
+      {
+        constexpr static bool const value = true;
+      };
+
+      template <class A>
+      constexpr bool const is_allocator_v = is_allocator<A>::value;
+
+      template <class H>
+      constexpr bool const is_hash_v =
+        !std::is_integral<H>::value && !is_allocator_v<H>;
+
+      template <class P> constexpr bool const is_pred_v = !is_allocator_v<P>;
+
+      template <typename T>
+      using iter_key_t =
+        typename std::iterator_traits<T>::value_type::first_type;
+      template <typename T>
+      using iter_val_t =
+        typename std::iterator_traits<T>::value_type::second_type;
+      template <typename T>
+      using iter_to_alloc_t =
+        typename std::pair<iter_key_t<T> const, iter_val_t<T> >;
+#endif
+    } // namespace detail
+  } // namespace unordered
+} // namespace boost
+
+#endif // BOOST_UNORDERED_DETAIL_TYPE_TRAITS_HPP

thirdparty/include/boost/unordered/detail/xmx.hpp

@@ -0,0 +1,75 @@
+/* 32b/64b xmx mix function.
+ *
+ * Copyright 2022 Peter Dimov.
+ * Copyright 2022 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_DETAIL_XMX_HPP
+#define BOOST_UNORDERED_DETAIL_XMX_HPP
+
+#include <boost/cstdint.hpp>
+#include <climits>
+#include <cstddef>
+
+namespace boost{
+namespace unordered{
+namespace detail{
+
+/* Bit mixer for improvement of statistical properties of hash functions.
+ * The implementation is different on 64bit and 32bit architectures:
+ * 
+ *   - 64bit: same as xmx function in
+ *     http://jonkagstrom.com/bit-mixer-construction/index.html
+ *   - 32bit: generated by Hash Function Prospector
+ *     (https://github.com/skeeto/hash-prospector) and selected as the
+ *     best overall performer in benchmarks of Boost.Unordered flat containers.
+ *     Score assigned by Hash Prospector: 333.7934929677524
+ */
+
+#if defined(SIZE_MAX)
+#if ((((SIZE_MAX >> 16) >> 16) >> 16) >> 15) != 0
+#define BOOST_UNORDERED_64B_ARCHITECTURE /* >64 bits assumed as 64 bits */
+#endif
+#elif defined(UINTPTR_MAX) /* used as proxy for std::size_t */
+#if ((((UINTPTR_MAX >> 16) >> 16) >> 16) >> 15) != 0
+#define BOOST_UNORDERED_64B_ARCHITECTURE
+#endif
+#endif
+
+static inline std::size_t xmx(std::size_t x)noexcept
+{
+#if defined(BOOST_UNORDERED_64B_ARCHITECTURE)
+
+  boost::uint64_t z=(boost::uint64_t)x;
+
+  z^=z>>23;
+  z*=0xff51afd7ed558ccdull;
+  z^=z>>23;
+
+  return (std::size_t)z;
+
+#else /* 32 bits assumed */
+
+  x^=x>>18;
+  x*=0x56b5aaadu;
+  x^=x>>16;
+
+  return x;
+
+#endif
+}
+
+#ifdef BOOST_UNORDERED_64B_ARCHITECTURE
+#undef BOOST_UNORDERED_64B_ARCHITECTURE
+#endif
+
+} /* namespace detail */
+} /* namespace unordered */
+} /* namespace boost */
+
+#endif

thirdparty/include/boost/unordered/hash_traits.hpp

@@ -0,0 +1,44 @@
+/* Hash function characterization.
+ *
+ * Copyright 2022 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See https://www.boost.org/libs/unordered for library home page.
+ */
+
+#ifndef BOOST_UNORDERED_HASH_TRAITS_HPP
+#define BOOST_UNORDERED_HASH_TRAITS_HPP
+
+#include <boost/unordered/detail/type_traits.hpp>
+
+namespace boost{
+namespace unordered{
+
+namespace detail{
+
+template<typename Hash,typename=void>
+struct hash_is_avalanching_impl: std::false_type{};
+
+template<typename Hash>
+struct hash_is_avalanching_impl<Hash,
+  boost::unordered::detail::void_t<typename Hash::is_avalanching> >:
+    std::true_type{};
+
+} /* namespace detail */
+
+/* Each trait can be partially specialized by users for concrete hash functions
+ * when actual characterization differs from default.
+ */
+
+/* hash_is_avalanching<Hash>::value is true when the type Hash::is_avalanching
+ * is present, false otherwise.
+ */
+template<typename Hash>
+struct hash_is_avalanching: detail::hash_is_avalanching_impl<Hash>::type{};
+
+} /* namespace unordered */
+} /* namespace boost */
+
+#endif

thirdparty/include/boost/unordered/unordered_flat_map.hpp

@@ -0,0 +1,800 @@
+// Copyright (C) 2022-2023 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_UNORDERED_FLAT_MAP_HPP_INCLUDED
+#define BOOST_UNORDERED_UNORDERED_FLAT_MAP_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <boost/unordered/concurrent_flat_map_fwd.hpp>
+#include <boost/unordered/detail/foa/flat_map_types.hpp>
+#include <boost/unordered/detail/foa/table.hpp>
+#include <boost/unordered/detail/serialize_container.hpp>
+#include <boost/unordered/detail/type_traits.hpp>
+#include <boost/unordered/unordered_flat_map_fwd.hpp>
+
+#include <boost/core/allocator_access.hpp>
+#include <boost/container_hash/hash.hpp>
+#include <boost/throw_exception.hpp>
+
+#include <initializer_list>
+#include <iterator>
+#include <stdexcept>
+#include <type_traits>
+#include <utility>
+
+namespace boost {
+  namespace unordered {
+
+#if defined(BOOST_MSVC)
+#pragma warning(push)
+#pragma warning(disable : 4714) /* marked as __forceinline not inlined */
+#endif
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    class unordered_flat_map
+    {
+      template <class Key2, class T2, class Hash2, class Pred2,
+        class Allocator2>
+      friend class concurrent_flat_map;
+
+      using map_types = detail::foa::flat_map_types<Key, T>;
+
+      using table_type = detail::foa::table<map_types, Hash, KeyEqual,
+        typename boost::allocator_rebind<Allocator,
+          typename map_types::value_type>::type>;
+
+      table_type table_;
+
+      template <class K, class V, class H, class KE, class A>
+      bool friend operator==(unordered_flat_map<K, V, H, KE, A> const& lhs,
+        unordered_flat_map<K, V, H, KE, A> const& rhs);
+
+      template <class K, class V, class H, class KE, class A, class Pred>
+      typename unordered_flat_map<K, V, H, KE, A>::size_type friend erase_if(
+        unordered_flat_map<K, V, H, KE, A>& set, Pred pred);
+
+    public:
+      using key_type = Key;
+      using mapped_type = T;
+      using value_type = typename map_types::value_type;
+      using init_type = typename map_types::init_type;
+      using size_type = std::size_t;
+      using difference_type = std::ptrdiff_t;
+      using hasher = typename boost::unordered::detail::type_identity<Hash>::type;
+      using key_equal = typename boost::unordered::detail::type_identity<KeyEqual>::type;
+      using allocator_type = typename boost::unordered::detail::type_identity<Allocator>::type;
+      using reference = value_type&;
+      using const_reference = value_type const&;
+      using pointer = typename boost::allocator_pointer<allocator_type>::type;
+      using const_pointer =
+        typename boost::allocator_const_pointer<allocator_type>::type;
+      using iterator = typename table_type::iterator;
+      using const_iterator = typename table_type::const_iterator;
+
+      unordered_flat_map() : unordered_flat_map(0) {}
+
+      explicit unordered_flat_map(size_type n, hasher const& h = hasher(),
+        key_equal const& pred = key_equal(),
+        allocator_type const& a = allocator_type())
+          : table_(n, h, pred, a)
+      {
+      }
+
+      unordered_flat_map(size_type n, allocator_type const& a)
+          : unordered_flat_map(n, hasher(), key_equal(), a)
+      {
+      }
+
+      unordered_flat_map(size_type n, hasher const& h, allocator_type const& a)
+          : unordered_flat_map(n, h, key_equal(), a)
+      {
+      }
+
+      template <class InputIterator>
+      unordered_flat_map(
+        InputIterator f, InputIterator l, allocator_type const& a)
+          : unordered_flat_map(f, l, size_type(0), hasher(), key_equal(), a)
+      {
+      }
+
+      explicit unordered_flat_map(allocator_type const& a)
+          : unordered_flat_map(0, a)
+      {
+      }
+
+      template <class Iterator>
+      unordered_flat_map(Iterator first, Iterator last, size_type n = 0,
+        hasher const& h = hasher(), key_equal const& pred = key_equal(),
+        allocator_type const& a = allocator_type())
+          : unordered_flat_map(n, h, pred, a)
+      {
+        this->insert(first, last);
+      }
+
+      template <class Iterator>
+      unordered_flat_map(
+        Iterator first, Iterator last, size_type n, allocator_type const& a)
+          : unordered_flat_map(first, last, n, hasher(), key_equal(), a)
+      {
+      }
+
+      template <class Iterator>
+      unordered_flat_map(Iterator first, Iterator last, size_type n,
+        hasher const& h, allocator_type const& a)
+          : unordered_flat_map(first, last, n, h, key_equal(), a)
+      {
+      }
+
+      unordered_flat_map(unordered_flat_map const& other) : table_(other.table_)
+      {
+      }
+
+      unordered_flat_map(
+        unordered_flat_map const& other, allocator_type const& a)
+          : table_(other.table_, a)
+      {
+      }
+
+      unordered_flat_map(unordered_flat_map&& other)
+        noexcept(std::is_nothrow_move_constructible<table_type>::value)
+          : table_(std::move(other.table_))
+      {
+      }
+
+      unordered_flat_map(unordered_flat_map&& other, allocator_type const& al)
+          : table_(std::move(other.table_), al)
+      {
+      }
+
+      unordered_flat_map(std::initializer_list<value_type> ilist,
+        size_type n = 0, hasher const& h = hasher(),
+        key_equal const& pred = key_equal(),
+        allocator_type const& a = allocator_type())
+          : unordered_flat_map(ilist.begin(), ilist.end(), n, h, pred, a)
+      {
+      }
+
+      unordered_flat_map(
+        std::initializer_list<value_type> il, allocator_type const& a)
+          : unordered_flat_map(il, size_type(0), hasher(), key_equal(), a)
+      {
+      }
+
+      unordered_flat_map(std::initializer_list<value_type> init, size_type n,
+        allocator_type const& a)
+          : unordered_flat_map(init, n, hasher(), key_equal(), a)
+      {
+      }
+
+      unordered_flat_map(std::initializer_list<value_type> init, size_type n,
+        hasher const& h, allocator_type const& a)
+          : unordered_flat_map(init, n, h, key_equal(), a)
+      {
+      }
+
+      unordered_flat_map(
+        concurrent_flat_map<Key, T, Hash, KeyEqual, Allocator>&& other)
+          : table_(std::move(other.table_))
+      {
+      }
+
+      ~unordered_flat_map() = default;
+
+      unordered_flat_map& operator=(unordered_flat_map const& other)
+      {
+        table_ = other.table_;
+        return *this;
+      }
+
+      unordered_flat_map& operator=(unordered_flat_map&& other) noexcept(
+        noexcept(std::declval<table_type&>() = std::declval<table_type&&>()))
+      {
+        table_ = std::move(other.table_);
+        return *this;
+      }
+
+      allocator_type get_allocator() const noexcept
+      {
+        return table_.get_allocator();
+      }
+
+      /// Iterators
+      ///
+
+      iterator begin() noexcept { return table_.begin(); }
+      const_iterator begin() const noexcept { return table_.begin(); }
+      const_iterator cbegin() const noexcept { return table_.cbegin(); }
+
+      iterator end() noexcept { return table_.end(); }
+      const_iterator end() const noexcept { return table_.end(); }
+      const_iterator cend() const noexcept { return table_.cend(); }
+
+      /// Capacity
+      ///
+
+      BOOST_ATTRIBUTE_NODISCARD bool empty() const noexcept
+      {
+        return table_.empty();
+      }
+
+      size_type size() const noexcept { return table_.size(); }
+
+      size_type max_size() const noexcept { return table_.max_size(); }
+
+      /// Modifiers
+      ///
+
+      void clear() noexcept { table_.clear(); }
+
+      template <class Ty>
+      BOOST_FORCEINLINE auto insert(Ty&& value)
+        -> decltype(table_.insert(std::forward<Ty>(value)))
+      {
+        return table_.insert(std::forward<Ty>(value));
+      }
+
+      BOOST_FORCEINLINE std::pair<iterator, bool> insert(init_type&& value)
+      {
+        return table_.insert(std::move(value));
+      }
+
+      template <class Ty>
+      BOOST_FORCEINLINE auto insert(const_iterator, Ty&& value)
+        -> decltype(table_.insert(std::forward<Ty>(value)).first)
+      {
+        return table_.insert(std::forward<Ty>(value)).first;
+      }
+
+      BOOST_FORCEINLINE iterator insert(const_iterator, init_type&& value)
+      {
+        return table_.insert(std::move(value)).first;
+      }
+
+      template <class InputIterator>
+      BOOST_FORCEINLINE void insert(InputIterator first, InputIterator last)
+      {
+        for (auto pos = first; pos != last; ++pos) {
+          table_.emplace(*pos);
+        }
+      }
+
+      void insert(std::initializer_list<value_type> ilist)
+      {
+        this->insert(ilist.begin(), ilist.end());
+      }
+
+      template <class M>
+      std::pair<iterator, bool> insert_or_assign(key_type const& key, M&& obj)
+      {
+        auto ibp = table_.try_emplace(key, std::forward<M>(obj));
+        if (ibp.second) {
+          return ibp;
+        }
+        ibp.first->second = std::forward<M>(obj);
+        return ibp;
+      }
+
+      template <class M>
+      std::pair<iterator, bool> insert_or_assign(key_type&& key, M&& obj)
+      {
+        auto ibp = table_.try_emplace(std::move(key), std::forward<M>(obj));
+        if (ibp.second) {
+          return ibp;
+        }
+        ibp.first->second = std::forward<M>(obj);
+        return ibp;
+      }
+
+      template <class K, class M>
+      typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        std::pair<iterator, bool> >::type
+      insert_or_assign(K&& k, M&& obj)
+      {
+        auto ibp = table_.try_emplace(std::forward<K>(k), std::forward<M>(obj));
+        if (ibp.second) {
+          return ibp;
+        }
+        ibp.first->second = std::forward<M>(obj);
+        return ibp;
+      }
+
+      template <class M>
+      iterator insert_or_assign(const_iterator, key_type const& key, M&& obj)
+      {
+        return this->insert_or_assign(key, std::forward<M>(obj)).first;
+      }
+
+      template <class M>
+      iterator insert_or_assign(const_iterator, key_type&& key, M&& obj)
+      {
+        return this->insert_or_assign(std::move(key), std::forward<M>(obj))
+          .first;
+      }
+
+      template <class K, class M>
+      typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        iterator>::type
+      insert_or_assign(const_iterator, K&& k, M&& obj)
+      {
+        return this->insert_or_assign(std::forward<K>(k), std::forward<M>(obj))
+          .first;
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE std::pair<iterator, bool> emplace(Args&&... args)
+      {
+        return table_.emplace(std::forward<Args>(args)...);
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE iterator emplace_hint(const_iterator, Args&&... args)
+      {
+        return table_.emplace(std::forward<Args>(args)...).first;
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE std::pair<iterator, bool> try_emplace(
+        key_type const& key, Args&&... args)
+      {
+        return table_.try_emplace(key, std::forward<Args>(args)...);
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE std::pair<iterator, bool> try_emplace(
+        key_type&& key, Args&&... args)
+      {
+        return table_.try_emplace(std::move(key), std::forward<Args>(args)...);
+      }
+
+      template <class K, class... Args>
+      BOOST_FORCEINLINE typename std::enable_if<
+        boost::unordered::detail::transparent_non_iterable<K,
+          unordered_flat_map>::value,
+        std::pair<iterator, bool> >::type
+      try_emplace(K&& key, Args&&... args)
+      {
+        return table_.try_emplace(
+          std::forward<K>(key), std::forward<Args>(args)...);
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE iterator try_emplace(
+        const_iterator, key_type const& key, Args&&... args)
+      {
+        return table_.try_emplace(key, std::forward<Args>(args)...).first;
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE iterator try_emplace(
+        const_iterator, key_type&& key, Args&&... args)
+      {
+        return table_.try_emplace(std::move(key), std::forward<Args>(args)...)
+          .first;
+      }
+
+      template <class K, class... Args>
+      BOOST_FORCEINLINE typename std::enable_if<
+        boost::unordered::detail::transparent_non_iterable<K,
+          unordered_flat_map>::value,
+        iterator>::type
+      try_emplace(const_iterator, K&& key, Args&&... args)
+      {
+        return table_
+          .try_emplace(std::forward<K>(key), std::forward<Args>(args)...)
+          .first;
+      }
+
+      BOOST_FORCEINLINE typename table_type::erase_return_type erase(
+        iterator pos)
+      {
+        return table_.erase(pos);
+      }
+
+      BOOST_FORCEINLINE typename table_type::erase_return_type erase(
+        const_iterator pos)
+      {
+        return table_.erase(pos);
+      }
+
+      iterator erase(const_iterator first, const_iterator last)
+      {
+        while (first != last) {
+          this->erase(first++);
+        }
+        return iterator{detail::foa::const_iterator_cast_tag{}, last};
+      }
+
+      BOOST_FORCEINLINE size_type erase(key_type const& key)
+      {
+        return table_.erase(key);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::transparent_non_iterable<K, unordered_flat_map>::value,
+        size_type>::type
+      erase(K const& key)
+      {
+        return table_.erase(key);
+      }
+
+      void swap(unordered_flat_map& rhs) noexcept(
+        noexcept(std::declval<table_type&>().swap(std::declval<table_type&>())))
+      {
+        table_.swap(rhs.table_);
+      }
+
+      template <class H2, class P2>
+      void merge(
+        unordered_flat_map<key_type, mapped_type, H2, P2, allocator_type>&
+          source)
+      {
+        table_.merge(source.table_);
+      }
+
+      template <class H2, class P2>
+      void merge(
+        unordered_flat_map<key_type, mapped_type, H2, P2, allocator_type>&&
+          source)
+      {
+        table_.merge(std::move(source.table_));
+      }
+
+      /// Lookup
+      ///
+
+      mapped_type& at(key_type const& key)
+      {
+        auto pos = table_.find(key);
+        if (pos != table_.end()) {
+          return pos->second;
+        }
+        // TODO: someday refactor this to conditionally serialize the key and
+        // include it in the error message
+        //
+        boost::throw_exception(
+          std::out_of_range("key was not found in unordered_flat_map"));
+      }
+
+      mapped_type const& at(key_type const& key) const
+      {
+        auto pos = table_.find(key);
+        if (pos != table_.end()) {
+          return pos->second;
+        }
+        boost::throw_exception(
+          std::out_of_range("key was not found in unordered_flat_map"));
+      }
+
+      template <class K>
+      typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        mapped_type&>::type
+      at(K&& key)
+      {
+        auto pos = table_.find(std::forward<K>(key));
+        if (pos != table_.end()) {
+          return pos->second;
+        }
+        boost::throw_exception(
+          std::out_of_range("key was not found in unordered_flat_map"));
+      }
+
+      template <class K>
+      typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        mapped_type const&>::type
+      at(K&& key) const
+      {
+        auto pos = table_.find(std::forward<K>(key));
+        if (pos != table_.end()) {
+          return pos->second;
+        }
+        boost::throw_exception(
+          std::out_of_range("key was not found in unordered_flat_map"));
+      }
+
+      BOOST_FORCEINLINE mapped_type& operator[](key_type const& key)
+      {
+        return table_.try_emplace(key).first->second;
+      }
+
+      BOOST_FORCEINLINE mapped_type& operator[](key_type&& key)
+      {
+        return table_.try_emplace(std::move(key)).first->second;
+      }
+
+      template <class K>
+      typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        mapped_type&>::type
+      operator[](K&& key)
+      {
+        return table_.try_emplace(std::forward<K>(key)).first->second;
+      }
+
+      BOOST_FORCEINLINE size_type count(key_type const& key) const
+      {
+        auto pos = table_.find(key);
+        return pos != table_.end() ? 1 : 0;
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value, size_type>::type
+      count(K const& key) const
+      {
+        auto pos = table_.find(key);
+        return pos != table_.end() ? 1 : 0;
+      }
+
+      BOOST_FORCEINLINE iterator find(key_type const& key)
+      {
+        return table_.find(key);
+      }
+
+      BOOST_FORCEINLINE const_iterator find(key_type const& key) const
+      {
+        return table_.find(key);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        iterator>::type
+      find(K const& key)
+      {
+        return table_.find(key);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        const_iterator>::type
+      find(K const& key) const
+      {
+        return table_.find(key);
+      }
+
+      BOOST_FORCEINLINE bool contains(key_type const& key) const
+      {
+        return this->find(key) != this->end();
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        bool>::type
+      contains(K const& key) const
+      {
+        return this->find(key) != this->end();
+      }
+
+      std::pair<iterator, iterator> equal_range(key_type const& key)
+      {
+        auto pos = table_.find(key);
+        if (pos == table_.end()) {
+          return {pos, pos};
+        }
+
+        auto next = pos;
+        ++next;
+        return {pos, next};
+      }
+
+      std::pair<const_iterator, const_iterator> equal_range(
+        key_type const& key) const
+      {
+        auto pos = table_.find(key);
+        if (pos == table_.end()) {
+          return {pos, pos};
+        }
+
+        auto next = pos;
+        ++next;
+        return {pos, next};
+      }
+
+      template <class K>
+      typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value,
+        std::pair<iterator, iterator> >::type
+      equal_range(K const& key)
+      {
+        auto pos = table_.find(key);
+        if (pos == table_.end()) {
+          return {pos, pos};
+        }
+
+        auto next = pos;
+        ++next;
+        return {pos, next};
+      }
+
+      template <class K>
+      typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value,
+        std::pair<const_iterator, const_iterator> >::type
+      equal_range(K const& key) const
+      {
+        auto pos = table_.find(key);
+        if (pos == table_.end()) {
+          return {pos, pos};
+        }
+
+        auto next = pos;
+        ++next;
+        return {pos, next};
+      }
+
+      /// Hash Policy
+      ///
+
+      size_type bucket_count() const noexcept { return table_.capacity(); }
+
+      float load_factor() const noexcept { return table_.load_factor(); }
+
+      float max_load_factor() const noexcept
+      {
+        return table_.max_load_factor();
+      }
+
+      void max_load_factor(float) {}
+
+      size_type max_load() const noexcept { return table_.max_load(); }
+
+      void rehash(size_type n) { table_.rehash(n); }
+
+      void reserve(size_type n) { table_.reserve(n); }
+
+      /// Observers
+      ///
+
+      hasher hash_function() const { return table_.hash_function(); }
+
+      key_equal key_eq() const { return table_.key_eq(); }
+    };
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    bool operator==(
+      unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
+      unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& rhs)
+    {
+      return lhs.table_ == rhs.table_;
+    }
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    bool operator!=(
+      unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
+      unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& rhs)
+    {
+      return !(lhs == rhs);
+    }
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    void swap(unordered_flat_map<Key, T, Hash, KeyEqual, Allocator>& lhs,
+      unordered_flat_map<Key, T, Hash, KeyEqual, Allocator>& rhs)
+      noexcept(noexcept(lhs.swap(rhs)))
+    {
+      lhs.swap(rhs);
+    }
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator,
+      class Pred>
+    typename unordered_flat_map<Key, T, Hash, KeyEqual, Allocator>::size_type
+    erase_if(
+      unordered_flat_map<Key, T, Hash, KeyEqual, Allocator>& map, Pred pred)
+    {
+      return erase_if(map.table_, pred);
+    }
+
+    template <class Archive, class Key, class T, class Hash, class KeyEqual,
+      class Allocator>
+    void serialize(Archive& ar,
+      unordered_flat_map<Key, T, Hash, KeyEqual, Allocator>& map,
+      unsigned int version)
+    {
+      detail::serialize_container(ar, map, version);
+    }
+
+#if defined(BOOST_MSVC)
+#pragma warning(pop) /* C4714 */
+#endif
+
+#if BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
+
+    template <class InputIterator,
+      class Hash =
+        boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
+      class Pred =
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+      class Allocator = std::allocator<
+        boost::unordered::detail::iter_to_alloc_t<InputIterator> >,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_map(InputIterator, InputIterator,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> unordered_flat_map<boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>, Hash, Pred,
+        Allocator>;
+
+    template <class Key, class T,
+      class Hash = boost::hash<std::remove_const_t<Key> >,
+      class Pred = std::equal_to<std::remove_const_t<Key> >,
+      class Allocator = std::allocator<std::pair<const Key, T> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_map(std::initializer_list<std::pair<Key, T> >,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> unordered_flat_map<std::remove_const_t<Key>, T, Hash, Pred,
+        Allocator>;
+
+    template <class InputIterator, class Allocator,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_map(InputIterator, InputIterator, std::size_t, Allocator)
+      -> unordered_flat_map<boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>,
+        boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+        Allocator>;
+
+    template <class InputIterator, class Allocator,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_map(InputIterator, InputIterator, Allocator)
+      -> unordered_flat_map<boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>,
+        boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+        Allocator>;
+
+    template <class InputIterator, class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_map(
+      InputIterator, InputIterator, std::size_t, Hash, Allocator)
+      -> unordered_flat_map<boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>, Hash,
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+        Allocator>;
+
+    template <class Key, class T, class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_map(std::initializer_list<std::pair<Key, T> >, std::size_t,
+      Allocator) -> unordered_flat_map<std::remove_const_t<Key>, T,
+      boost::hash<std::remove_const_t<Key> >,
+      std::equal_to<std::remove_const_t<Key> >, Allocator>;
+
+    template <class Key, class T, class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_map(std::initializer_list<std::pair<Key, T> >, Allocator)
+      -> unordered_flat_map<std::remove_const_t<Key>, T,
+        boost::hash<std::remove_const_t<Key> >,
+        std::equal_to<std::remove_const_t<Key> >, Allocator>;
+
+    template <class Key, class T, class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_map(std::initializer_list<std::pair<Key, T> >, std::size_t,
+      Hash, Allocator) -> unordered_flat_map<std::remove_const_t<Key>, T,
+      Hash, std::equal_to<std::remove_const_t<Key> >, Allocator>;
+#endif
+
+  } // namespace unordered
+} // namespace boost
+
+#endif

thirdparty/include/boost/unordered/unordered_flat_map_fwd.hpp

@@ -0,0 +1,44 @@
+
+// Copyright (C) 2022 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_FLAT_MAP_FWD_HPP_INCLUDED
+#define BOOST_UNORDERED_FLAT_MAP_FWD_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <boost/container_hash/hash_fwd.hpp>
+#include <functional>
+#include <memory>
+
+namespace boost {
+  namespace unordered {
+    template <class Key, class T, class Hash = boost::hash<Key>,
+      class KeyEqual = std::equal_to<Key>,
+      class Allocator = std::allocator<std::pair<const Key, T> > >
+    class unordered_flat_map;
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    bool operator==(
+      unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
+      unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& rhs);
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    bool operator!=(
+      unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
+      unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& rhs);
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    void swap(unordered_flat_map<Key, T, Hash, KeyEqual, Allocator>& lhs,
+      unordered_flat_map<Key, T, Hash, KeyEqual, Allocator>& rhs)
+      noexcept(noexcept(lhs.swap(rhs)));
+  } // namespace unordered
+
+  using boost::unordered::unordered_flat_map;
+} // namespace boost
+
+#endif

thirdparty/include/boost/unordered/unordered_flat_set.hpp

@@ -0,0 +1,610 @@
+// Copyright (C) 2022-2023 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_UNORDERED_FLAT_SET_HPP_INCLUDED
+#define BOOST_UNORDERED_UNORDERED_FLAT_SET_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <boost/unordered/concurrent_flat_set_fwd.hpp>
+#include <boost/unordered/detail/foa/flat_set_types.hpp>
+#include <boost/unordered/detail/foa/table.hpp>
+#include <boost/unordered/detail/serialize_container.hpp>
+#include <boost/unordered/detail/type_traits.hpp>
+#include <boost/unordered/unordered_flat_set_fwd.hpp>
+
+#include <boost/core/allocator_access.hpp>
+#include <boost/container_hash/hash.hpp>
+
+#include <initializer_list>
+#include <iterator>
+#include <type_traits>
+#include <utility>
+
+namespace boost {
+  namespace unordered {
+
+#if defined(BOOST_MSVC)
+#pragma warning(push)
+#pragma warning(disable : 4714) /* marked as __forceinline not inlined */
+#endif
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    class unordered_flat_set
+    {
+      template <class Key2, class Hash2, class KeyEqual2, class Allocator2>
+      friend class concurrent_flat_set;
+
+      using set_types = detail::foa::flat_set_types<Key>;
+
+      using table_type = detail::foa::table<set_types, Hash, KeyEqual,
+        typename boost::allocator_rebind<Allocator,
+          typename set_types::value_type>::type>;
+
+      table_type table_;
+
+      template <class K, class H, class KE, class A>
+      bool friend operator==(unordered_flat_set<K, H, KE, A> const& lhs,
+        unordered_flat_set<K, H, KE, A> const& rhs);
+
+      template <class K, class H, class KE, class A, class Pred>
+      typename unordered_flat_set<K, H, KE, A>::size_type friend erase_if(
+        unordered_flat_set<K, H, KE, A>& set, Pred pred);
+
+    public:
+      using key_type = Key;
+      using value_type = typename set_types::value_type;
+      using init_type = typename set_types::init_type;
+      using size_type = std::size_t;
+      using difference_type = std::ptrdiff_t;
+      using hasher = Hash;
+      using key_equal = KeyEqual;
+      using allocator_type = Allocator;
+      using reference = value_type&;
+      using const_reference = value_type const&;
+      using pointer = typename boost::allocator_pointer<allocator_type>::type;
+      using const_pointer =
+        typename boost::allocator_const_pointer<allocator_type>::type;
+      using iterator = typename table_type::iterator;
+      using const_iterator = typename table_type::const_iterator;
+
+      unordered_flat_set() : unordered_flat_set(0) {}
+
+      explicit unordered_flat_set(size_type n, hasher const& h = hasher(),
+        key_equal const& pred = key_equal(),
+        allocator_type const& a = allocator_type())
+          : table_(n, h, pred, a)
+      {
+      }
+
+      unordered_flat_set(size_type n, allocator_type const& a)
+          : unordered_flat_set(n, hasher(), key_equal(), a)
+      {
+      }
+
+      unordered_flat_set(size_type n, hasher const& h, allocator_type const& a)
+          : unordered_flat_set(n, h, key_equal(), a)
+      {
+      }
+
+      template <class InputIterator>
+      unordered_flat_set(
+        InputIterator f, InputIterator l, allocator_type const& a)
+          : unordered_flat_set(f, l, size_type(0), hasher(), key_equal(), a)
+      {
+      }
+
+      explicit unordered_flat_set(allocator_type const& a)
+          : unordered_flat_set(0, a)
+      {
+      }
+
+      template <class Iterator>
+      unordered_flat_set(Iterator first, Iterator last, size_type n = 0,
+        hasher const& h = hasher(), key_equal const& pred = key_equal(),
+        allocator_type const& a = allocator_type())
+          : unordered_flat_set(n, h, pred, a)
+      {
+        this->insert(first, last);
+      }
+
+      template <class InputIt>
+      unordered_flat_set(
+        InputIt first, InputIt last, size_type n, allocator_type const& a)
+          : unordered_flat_set(first, last, n, hasher(), key_equal(), a)
+      {
+      }
+
+      template <class Iterator>
+      unordered_flat_set(Iterator first, Iterator last, size_type n,
+        hasher const& h, allocator_type const& a)
+          : unordered_flat_set(first, last, n, h, key_equal(), a)
+      {
+      }
+
+      unordered_flat_set(unordered_flat_set const& other) : table_(other.table_)
+      {
+      }
+
+      unordered_flat_set(
+        unordered_flat_set const& other, allocator_type const& a)
+          : table_(other.table_, a)
+      {
+      }
+
+      unordered_flat_set(unordered_flat_set&& other)
+        noexcept(std::is_nothrow_move_constructible<table_type>::value)
+          : table_(std::move(other.table_))
+      {
+      }
+
+      unordered_flat_set(unordered_flat_set&& other, allocator_type const& al)
+          : table_(std::move(other.table_), al)
+      {
+      }
+
+      unordered_flat_set(std::initializer_list<value_type> ilist,
+        size_type n = 0, hasher const& h = hasher(),
+        key_equal const& pred = key_equal(),
+        allocator_type const& a = allocator_type())
+          : unordered_flat_set(ilist.begin(), ilist.end(), n, h, pred, a)
+      {
+      }
+
+      unordered_flat_set(
+        std::initializer_list<value_type> il, allocator_type const& a)
+          : unordered_flat_set(il, size_type(0), hasher(), key_equal(), a)
+      {
+      }
+
+      unordered_flat_set(std::initializer_list<value_type> init, size_type n,
+        allocator_type const& a)
+          : unordered_flat_set(init, n, hasher(), key_equal(), a)
+      {
+      }
+
+      unordered_flat_set(std::initializer_list<value_type> init, size_type n,
+        hasher const& h, allocator_type const& a)
+          : unordered_flat_set(init, n, h, key_equal(), a)
+      {
+      }
+
+      unordered_flat_set(
+        concurrent_flat_set<Key, Hash, KeyEqual, Allocator>&& other)
+          : table_(std::move(other.table_))
+      {
+      }
+
+      ~unordered_flat_set() = default;
+
+      unordered_flat_set& operator=(unordered_flat_set const& other)
+      {
+        table_ = other.table_;
+        return *this;
+      }
+
+      unordered_flat_set& operator=(unordered_flat_set&& other) noexcept(
+        noexcept(std::declval<table_type&>() = std::declval<table_type&&>()))
+      {
+        table_ = std::move(other.table_);
+        return *this;
+      }
+
+      allocator_type get_allocator() const noexcept
+      {
+        return table_.get_allocator();
+      }
+
+      /// Iterators
+      ///
+
+      iterator begin() noexcept { return table_.begin(); }
+      const_iterator begin() const noexcept { return table_.begin(); }
+      const_iterator cbegin() const noexcept { return table_.cbegin(); }
+
+      iterator end() noexcept { return table_.end(); }
+      const_iterator end() const noexcept { return table_.end(); }
+      const_iterator cend() const noexcept { return table_.cend(); }
+
+      /// Capacity
+      ///
+
+      BOOST_ATTRIBUTE_NODISCARD bool empty() const noexcept
+      {
+        return table_.empty();
+      }
+
+      size_type size() const noexcept { return table_.size(); }
+
+      size_type max_size() const noexcept { return table_.max_size(); }
+
+      /// Modifiers
+      ///
+
+      void clear() noexcept { table_.clear(); }
+
+      BOOST_FORCEINLINE std::pair<iterator, bool> insert(
+        value_type const& value)
+      {
+        return table_.insert(value);
+      }
+
+      BOOST_FORCEINLINE std::pair<iterator, bool> insert(value_type&& value)
+      {
+        return table_.insert(std::move(value));
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::transparent_non_iterable<K, unordered_flat_set>::value,
+        std::pair<iterator, bool> >::type
+      insert(K&& k)
+      {
+        return table_.try_emplace(std::forward<K>(k));
+      }
+
+      BOOST_FORCEINLINE iterator insert(const_iterator, value_type const& value)
+      {
+        return table_.insert(value).first;
+      }
+
+      BOOST_FORCEINLINE iterator insert(const_iterator, value_type&& value)
+      {
+        return table_.insert(std::move(value)).first;
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::transparent_non_iterable<K, unordered_flat_set>::value,
+        iterator>::type
+      insert(const_iterator, K&& k)
+      {
+        return table_.try_emplace(std::forward<K>(k)).first;
+      }
+
+      template <class InputIterator>
+      void insert(InputIterator first, InputIterator last)
+      {
+        for (auto pos = first; pos != last; ++pos) {
+          table_.emplace(*pos);
+        }
+      }
+
+      void insert(std::initializer_list<value_type> ilist)
+      {
+        this->insert(ilist.begin(), ilist.end());
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE std::pair<iterator, bool> emplace(Args&&... args)
+      {
+        return table_.emplace(std::forward<Args>(args)...);
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE iterator emplace_hint(const_iterator, Args&&... args)
+      {
+        return table_.emplace(std::forward<Args>(args)...).first;
+      }
+
+      BOOST_FORCEINLINE typename table_type::erase_return_type erase(
+        const_iterator pos)
+      {
+        return table_.erase(pos);
+      }
+
+      iterator erase(const_iterator first, const_iterator last)
+      {
+        while (first != last) {
+          this->erase(first++);
+        }
+        return iterator{detail::foa::const_iterator_cast_tag{}, last};
+      }
+
+      BOOST_FORCEINLINE size_type erase(key_type const& key)
+      {
+        return table_.erase(key);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::transparent_non_iterable<K, unordered_flat_set>::value,
+        size_type>::type
+      erase(K const& key)
+      {
+        return table_.erase(key);
+      }
+
+      void swap(unordered_flat_set& rhs) noexcept(
+        noexcept(std::declval<table_type&>().swap(std::declval<table_type&>())))
+      {
+        table_.swap(rhs.table_);
+      }
+
+      template <class H2, class P2>
+      void merge(unordered_flat_set<key_type, H2, P2, allocator_type>& source)
+      {
+        table_.merge(source.table_);
+      }
+
+      template <class H2, class P2>
+      void merge(unordered_flat_set<key_type, H2, P2, allocator_type>&& source)
+      {
+        table_.merge(std::move(source.table_));
+      }
+
+      /// Lookup
+      ///
+
+      BOOST_FORCEINLINE size_type count(key_type const& key) const
+      {
+        auto pos = table_.find(key);
+        return pos != table_.end() ? 1 : 0;
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value, size_type>::type
+      count(K const& key) const
+      {
+        auto pos = table_.find(key);
+        return pos != table_.end() ? 1 : 0;
+      }
+
+      BOOST_FORCEINLINE iterator find(key_type const& key)
+      {
+        return table_.find(key);
+      }
+
+      BOOST_FORCEINLINE const_iterator find(key_type const& key) const
+      {
+        return table_.find(key);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        iterator>::type
+      find(K const& key)
+      {
+        return table_.find(key);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        const_iterator>::type
+      find(K const& key) const
+      {
+        return table_.find(key);
+      }
+
+      BOOST_FORCEINLINE bool contains(key_type const& key) const
+      {
+        return this->find(key) != this->end();
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        bool>::type
+      contains(K const& key) const
+      {
+        return this->find(key) != this->end();
+      }
+
+      std::pair<iterator, iterator> equal_range(key_type const& key)
+      {
+        auto pos = table_.find(key);
+        if (pos == table_.end()) {
+          return {pos, pos};
+        }
+
+        auto next = pos;
+        ++next;
+        return {pos, next};
+      }
+
+      std::pair<const_iterator, const_iterator> equal_range(
+        key_type const& key) const
+      {
+        auto pos = table_.find(key);
+        if (pos == table_.end()) {
+          return {pos, pos};
+        }
+
+        auto next = pos;
+        ++next;
+        return {pos, next};
+      }
+
+      template <class K>
+      typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value,
+        std::pair<iterator, iterator> >::type
+      equal_range(K const& key)
+      {
+        auto pos = table_.find(key);
+        if (pos == table_.end()) {
+          return {pos, pos};
+        }
+
+        auto next = pos;
+        ++next;
+        return {pos, next};
+      }
+
+      template <class K>
+      typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value,
+        std::pair<const_iterator, const_iterator> >::type
+      equal_range(K const& key) const
+      {
+        auto pos = table_.find(key);
+        if (pos == table_.end()) {
+          return {pos, pos};
+        }
+
+        auto next = pos;
+        ++next;
+        return {pos, next};
+      }
+
+      /// Hash Policy
+      ///
+
+      size_type bucket_count() const noexcept { return table_.capacity(); }
+
+      float load_factor() const noexcept { return table_.load_factor(); }
+
+      float max_load_factor() const noexcept
+      {
+        return table_.max_load_factor();
+      }
+
+      void max_load_factor(float) {}
+
+      size_type max_load() const noexcept { return table_.max_load(); }
+
+      void rehash(size_type n) { table_.rehash(n); }
+
+      void reserve(size_type n) { table_.reserve(n); }
+
+      /// Observers
+      ///
+
+      hasher hash_function() const { return table_.hash_function(); }
+
+      key_equal key_eq() const { return table_.key_eq(); }
+    };
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    bool operator==(
+      unordered_flat_set<Key, Hash, KeyEqual, Allocator> const& lhs,
+      unordered_flat_set<Key, Hash, KeyEqual, Allocator> const& rhs)
+    {
+      return lhs.table_ == rhs.table_;
+    }
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    bool operator!=(
+      unordered_flat_set<Key, Hash, KeyEqual, Allocator> const& lhs,
+      unordered_flat_set<Key, Hash, KeyEqual, Allocator> const& rhs)
+    {
+      return !(lhs == rhs);
+    }
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    void swap(unordered_flat_set<Key, Hash, KeyEqual, Allocator>& lhs,
+      unordered_flat_set<Key, Hash, KeyEqual, Allocator>& rhs)
+      noexcept(noexcept(lhs.swap(rhs)))
+    {
+      lhs.swap(rhs);
+    }
+
+    template <class Key, class Hash, class KeyEqual, class Allocator,
+      class Pred>
+    typename unordered_flat_set<Key, Hash, KeyEqual, Allocator>::size_type
+    erase_if(unordered_flat_set<Key, Hash, KeyEqual, Allocator>& set, Pred pred)
+    {
+      return erase_if(set.table_, pred);
+    }
+
+    template <class Archive, class Key, class Hash, class KeyEqual,
+      class Allocator>
+    void serialize(Archive& ar,
+      unordered_flat_set<Key, Hash, KeyEqual, Allocator>& set,
+      unsigned int version)
+    {
+      detail::serialize_container(ar, set, version);
+    }
+
+#if defined(BOOST_MSVC)
+#pragma warning(pop) /* C4714 */
+#endif
+
+#if BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
+    template <class InputIterator,
+      class Hash =
+        boost::hash<typename std::iterator_traits<InputIterator>::value_type>,
+      class Pred =
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+      class Allocator = std::allocator<
+        typename std::iterator_traits<InputIterator>::value_type>,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_set(InputIterator, InputIterator,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> unordered_flat_set<
+        typename std::iterator_traits<InputIterator>::value_type, Hash, Pred,
+        Allocator>;
+
+    template <class T, class Hash = boost::hash<T>,
+      class Pred = std::equal_to<T>, class Allocator = std::allocator<T>,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_set(std::initializer_list<T>,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> unordered_flat_set<T, Hash, Pred, Allocator>;
+
+    template <class InputIterator, class Allocator,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_set(InputIterator, InputIterator, std::size_t, Allocator)
+      -> unordered_flat_set<
+        typename std::iterator_traits<InputIterator>::value_type,
+        boost::hash<typename std::iterator_traits<InputIterator>::value_type>,
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+        Allocator>;
+
+    template <class InputIterator, class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_set(
+      InputIterator, InputIterator, std::size_t, Hash, Allocator)
+      -> unordered_flat_set<
+        typename std::iterator_traits<InputIterator>::value_type, Hash,
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+        Allocator>;
+
+    template <class T, class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_set(std::initializer_list<T>, std::size_t, Allocator)
+      -> unordered_flat_set<T, boost::hash<T>, std::equal_to<T>, Allocator>;
+
+    template <class T, class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_set(std::initializer_list<T>, std::size_t, Hash, Allocator)
+      -> unordered_flat_set<T, Hash, std::equal_to<T>, Allocator>;
+
+    template <class InputIterator, class Allocator,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_set(InputIterator, InputIterator, Allocator)
+      -> unordered_flat_set<
+        typename std::iterator_traits<InputIterator>::value_type,
+        boost::hash<typename std::iterator_traits<InputIterator>::value_type>,
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+        Allocator>;
+
+    template <class T, class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_flat_set(std::initializer_list<T>, Allocator)
+      -> unordered_flat_set<T, boost::hash<T>, std::equal_to<T>, Allocator>;
+#endif
+
+  } // namespace unordered
+} // namespace boost
+
+#endif

thirdparty/include/boost/unordered/unordered_flat_set_fwd.hpp

@@ -0,0 +1,44 @@
+
+// Copyright (C) 2022 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_FLAT_SET_FWD_HPP_INCLUDED
+#define BOOST_UNORDERED_FLAT_SET_FWD_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <boost/container_hash/hash_fwd.hpp>
+#include <functional>
+#include <memory>
+
+namespace boost {
+  namespace unordered {
+    template <class Key, class Hash = boost::hash<Key>,
+      class KeyEqual = std::equal_to<Key>,
+      class Allocator = std::allocator<Key> >
+    class unordered_flat_set;
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    bool operator==(
+      unordered_flat_set<Key, Hash, KeyEqual, Allocator> const& lhs,
+      unordered_flat_set<Key, Hash, KeyEqual, Allocator> const& rhs);
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    bool operator!=(
+      unordered_flat_set<Key, Hash, KeyEqual, Allocator> const& lhs,
+      unordered_flat_set<Key, Hash, KeyEqual, Allocator> const& rhs);
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    void swap(unordered_flat_set<Key, Hash, KeyEqual, Allocator>& lhs,
+      unordered_flat_set<Key, Hash, KeyEqual, Allocator>& rhs)
+      noexcept(noexcept(lhs.swap(rhs)));
+  } // namespace unordered
+
+  using boost::unordered::unordered_flat_set;
+} // namespace boost
+
+#endif

thirdparty/include/boost/unordered/unordered_map_fwd.hpp

@@ -0,0 +1,67 @@
+
+// Copyright (C) 2008-2011 Daniel James.
+// Copyright (C) 2022-2023 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_MAP_FWD_HPP_INCLUDED
+#define BOOST_UNORDERED_MAP_FWD_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <boost/container_hash/hash_fwd.hpp>
+#include <functional>
+#include <memory>
+
+namespace boost {
+  namespace unordered {
+    template <class K, class T, class H = boost::hash<K>,
+      class P = std::equal_to<K>,
+      class A = std::allocator<std::pair<const K, T> > >
+    class unordered_map;
+
+    template <class K, class T, class H, class P, class A>
+    inline bool operator==(
+      unordered_map<K, T, H, P, A> const&, unordered_map<K, T, H, P, A> const&);
+    template <class K, class T, class H, class P, class A>
+    inline bool operator!=(
+      unordered_map<K, T, H, P, A> const&, unordered_map<K, T, H, P, A> const&);
+    template <class K, class T, class H, class P, class A>
+    inline void swap(unordered_map<K, T, H, P, A>& m1,
+      unordered_map<K, T, H, P, A>& m2) noexcept(noexcept(m1.swap(m2)));
+
+    template <class K, class T, class H, class P, class A, class Predicate>
+    typename unordered_map<K, T, H, P, A>::size_type erase_if(
+      unordered_map<K, T, H, P, A>& c, Predicate pred);
+
+    template <class K, class T, class H = boost::hash<K>,
+      class P = std::equal_to<K>,
+      class A = std::allocator<std::pair<const K, T> > >
+    class unordered_multimap;
+
+    template <class K, class T, class H, class P, class A>
+    inline bool operator==(unordered_multimap<K, T, H, P, A> const&,
+      unordered_multimap<K, T, H, P, A> const&);
+    template <class K, class T, class H, class P, class A>
+    inline bool operator!=(unordered_multimap<K, T, H, P, A> const&,
+      unordered_multimap<K, T, H, P, A> const&);
+    template <class K, class T, class H, class P, class A>
+    inline void swap(unordered_multimap<K, T, H, P, A>& m1,
+      unordered_multimap<K, T, H, P, A>& m2) noexcept(noexcept(m1.swap(m2)));
+
+    template <class K, class T, class H, class P, class A, class Predicate>
+    typename unordered_multimap<K, T, H, P, A>::size_type erase_if(
+      unordered_multimap<K, T, H, P, A>& c, Predicate pred);
+
+    template <class N, class K, class T, class A> class node_handle_map;
+    template <class Iter, class NodeType> struct insert_return_type_map;
+  } // namespace unordered
+
+  using boost::unordered::unordered_map;
+  using boost::unordered::unordered_multimap;
+} // namespace boost
+
+#endif

thirdparty/include/boost/unordered/unordered_node_map.hpp

@@ -0,0 +1,895 @@
+// Copyright (C) 2022-2023 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_UNORDERED_NODE_MAP_HPP_INCLUDED
+#define BOOST_UNORDERED_UNORDERED_NODE_MAP_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <boost/unordered/detail/foa/element_type.hpp>
+#include <boost/unordered/detail/foa/node_handle.hpp>
+#include <boost/unordered/detail/foa/node_map_types.hpp>
+#include <boost/unordered/detail/foa/table.hpp>
+#include <boost/unordered/detail/serialize_container.hpp>
+#include <boost/unordered/detail/type_traits.hpp>
+#include <boost/unordered/unordered_node_map_fwd.hpp>
+
+#include <boost/core/allocator_access.hpp>
+#include <boost/container_hash/hash.hpp>
+#include <boost/throw_exception.hpp>
+
+#include <initializer_list>
+#include <iterator>
+#include <stdexcept>
+#include <type_traits>
+#include <utility>
+
+namespace boost {
+  namespace unordered {
+
+#if defined(BOOST_MSVC)
+#pragma warning(push)
+#pragma warning(disable : 4714) /* marked as __forceinline not inlined */
+#endif
+
+    namespace detail {
+      template <class TypePolicy, class Allocator>
+      struct node_map_handle
+          : public detail::foa::node_handle_base<TypePolicy, Allocator>
+      {
+      private:
+        using base_type = detail::foa::node_handle_base<TypePolicy, Allocator>;
+
+        using typename base_type::type_policy;
+
+        template <class Key, class T, class Hash, class Pred, class Alloc>
+        friend class boost::unordered::unordered_node_map;
+
+      public:
+        using key_type = typename TypePolicy::key_type;
+        using mapped_type = typename TypePolicy::mapped_type;
+
+        constexpr node_map_handle() noexcept = default;
+        node_map_handle(node_map_handle&& nh) noexcept = default;
+
+        node_map_handle& operator=(node_map_handle&&) noexcept = default;
+
+        key_type& key() const
+        {
+          BOOST_ASSERT(!this->empty());
+          return const_cast<key_type&>(this->data().first);
+        }
+
+        mapped_type& mapped() const
+        {
+          BOOST_ASSERT(!this->empty());
+          return const_cast<mapped_type&>(this->data().second);
+        }
+      };
+    } // namespace detail
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    class unordered_node_map
+    {
+      using map_types = detail::foa::node_map_types<Key, T,
+        typename boost::allocator_void_pointer<Allocator>::type>;
+
+      using table_type = detail::foa::table<map_types, Hash, KeyEqual,
+        typename boost::allocator_rebind<Allocator,
+          std::pair<Key const, T> >::type>;
+
+      table_type table_;
+
+      template <class K, class V, class H, class KE, class A>
+      bool friend operator==(unordered_node_map<K, V, H, KE, A> const& lhs,
+        unordered_node_map<K, V, H, KE, A> const& rhs);
+
+      template <class K, class V, class H, class KE, class A, class Pred>
+      typename unordered_node_map<K, V, H, KE, A>::size_type friend erase_if(
+        unordered_node_map<K, V, H, KE, A>& set, Pred pred);
+
+    public:
+      using key_type = Key;
+      using mapped_type = T;
+      using value_type = typename map_types::value_type;
+      using init_type = typename map_types::init_type;
+      using size_type = std::size_t;
+      using difference_type = std::ptrdiff_t;
+      using hasher = typename boost::unordered::detail::type_identity<Hash>::type;
+      using key_equal = typename boost::unordered::detail::type_identity<KeyEqual>::type;
+      using allocator_type = typename boost::unordered::detail::type_identity<Allocator>::type;
+      using reference = value_type&;
+      using const_reference = value_type const&;
+      using pointer = typename boost::allocator_pointer<allocator_type>::type;
+      using const_pointer =
+        typename boost::allocator_const_pointer<allocator_type>::type;
+      using iterator = typename table_type::iterator;
+      using const_iterator = typename table_type::const_iterator;
+      using node_type = detail::node_map_handle<map_types,
+        typename boost::allocator_rebind<Allocator,
+          typename map_types::value_type>::type>;
+      using insert_return_type =
+        detail::foa::insert_return_type<iterator, node_type>;
+
+      unordered_node_map() : unordered_node_map(0) {}
+
+      explicit unordered_node_map(size_type n, hasher const& h = hasher(),
+        key_equal const& pred = key_equal(),
+        allocator_type const& a = allocator_type())
+          : table_(n, h, pred, a)
+      {
+      }
+
+      unordered_node_map(size_type n, allocator_type const& a)
+          : unordered_node_map(n, hasher(), key_equal(), a)
+      {
+      }
+
+      unordered_node_map(size_type n, hasher const& h, allocator_type const& a)
+          : unordered_node_map(n, h, key_equal(), a)
+      {
+      }
+
+      template <class InputIterator>
+      unordered_node_map(
+        InputIterator f, InputIterator l, allocator_type const& a)
+          : unordered_node_map(f, l, size_type(0), hasher(), key_equal(), a)
+      {
+      }
+
+      explicit unordered_node_map(allocator_type const& a)
+          : unordered_node_map(0, a)
+      {
+      }
+
+      template <class Iterator>
+      unordered_node_map(Iterator first, Iterator last, size_type n = 0,
+        hasher const& h = hasher(), key_equal const& pred = key_equal(),
+        allocator_type const& a = allocator_type())
+          : unordered_node_map(n, h, pred, a)
+      {
+        this->insert(first, last);
+      }
+
+      template <class Iterator>
+      unordered_node_map(
+        Iterator first, Iterator last, size_type n, allocator_type const& a)
+          : unordered_node_map(first, last, n, hasher(), key_equal(), a)
+      {
+      }
+
+      template <class Iterator>
+      unordered_node_map(Iterator first, Iterator last, size_type n,
+        hasher const& h, allocator_type const& a)
+          : unordered_node_map(first, last, n, h, key_equal(), a)
+      {
+      }
+
+      unordered_node_map(unordered_node_map const& other) : table_(other.table_)
+      {
+      }
+
+      unordered_node_map(
+        unordered_node_map const& other, allocator_type const& a)
+          : table_(other.table_, a)
+      {
+      }
+
+      unordered_node_map(unordered_node_map&& other)
+        noexcept(std::is_nothrow_move_constructible<table_type>::value)
+          : table_(std::move(other.table_))
+      {
+      }
+
+      unordered_node_map(unordered_node_map&& other, allocator_type const& al)
+          : table_(std::move(other.table_), al)
+      {
+      }
+
+      unordered_node_map(std::initializer_list<value_type> ilist,
+        size_type n = 0, hasher const& h = hasher(),
+        key_equal const& pred = key_equal(),
+        allocator_type const& a = allocator_type())
+          : unordered_node_map(ilist.begin(), ilist.end(), n, h, pred, a)
+      {
+      }
+
+      unordered_node_map(
+        std::initializer_list<value_type> il, allocator_type const& a)
+          : unordered_node_map(il, size_type(0), hasher(), key_equal(), a)
+      {
+      }
+
+      unordered_node_map(std::initializer_list<value_type> init, size_type n,
+        allocator_type const& a)
+          : unordered_node_map(init, n, hasher(), key_equal(), a)
+      {
+      }
+
+      unordered_node_map(std::initializer_list<value_type> init, size_type n,
+        hasher const& h, allocator_type const& a)
+          : unordered_node_map(init, n, h, key_equal(), a)
+      {
+      }
+
+      ~unordered_node_map() = default;
+
+      unordered_node_map& operator=(unordered_node_map const& other)
+      {
+        table_ = other.table_;
+        return *this;
+      }
+
+      unordered_node_map& operator=(unordered_node_map&& other) noexcept(
+        noexcept(std::declval<table_type&>() = std::declval<table_type&&>()))
+      {
+        table_ = std::move(other.table_);
+        return *this;
+      }
+
+      allocator_type get_allocator() const noexcept
+      {
+        return table_.get_allocator();
+      }
+
+      /// Iterators
+      ///
+
+      iterator begin() noexcept { return table_.begin(); }
+      const_iterator begin() const noexcept { return table_.begin(); }
+      const_iterator cbegin() const noexcept { return table_.cbegin(); }
+
+      iterator end() noexcept { return table_.end(); }
+      const_iterator end() const noexcept { return table_.end(); }
+      const_iterator cend() const noexcept { return table_.cend(); }
+
+      /// Capacity
+      ///
+
+      BOOST_ATTRIBUTE_NODISCARD bool empty() const noexcept
+      {
+        return table_.empty();
+      }
+
+      size_type size() const noexcept { return table_.size(); }
+
+      size_type max_size() const noexcept { return table_.max_size(); }
+
+      /// Modifiers
+      ///
+
+      void clear() noexcept { table_.clear(); }
+
+      template <class Ty>
+      BOOST_FORCEINLINE auto insert(Ty&& value)
+        -> decltype(table_.insert(std::forward<Ty>(value)))
+      {
+        return table_.insert(std::forward<Ty>(value));
+      }
+
+      BOOST_FORCEINLINE std::pair<iterator, bool> insert(init_type&& value)
+      {
+        return table_.insert(std::move(value));
+      }
+
+      template <class Ty>
+      BOOST_FORCEINLINE auto insert(const_iterator, Ty&& value)
+        -> decltype(table_.insert(std::forward<Ty>(value)).first)
+      {
+        return table_.insert(std::forward<Ty>(value)).first;
+      }
+
+      BOOST_FORCEINLINE iterator insert(const_iterator, init_type&& value)
+      {
+        return table_.insert(std::move(value)).first;
+      }
+
+      template <class InputIterator>
+      BOOST_FORCEINLINE void insert(InputIterator first, InputIterator last)
+      {
+        for (auto pos = first; pos != last; ++pos) {
+          table_.emplace(*pos);
+        }
+      }
+
+      void insert(std::initializer_list<value_type> ilist)
+      {
+        this->insert(ilist.begin(), ilist.end());
+      }
+
+      insert_return_type insert(node_type&& nh)
+      {
+        if (nh.empty()) {
+          return {end(), false, node_type{}};
+        }
+
+        BOOST_ASSERT(get_allocator() == nh.get_allocator());
+
+        auto itp = table_.insert(std::move(nh.element()));
+        if (itp.second) {
+          nh.reset();
+          return {itp.first, true, node_type{}};
+        } else {
+          return {itp.first, false, std::move(nh)};
+        }
+      }
+
+      iterator insert(const_iterator, node_type&& nh)
+      {
+        if (nh.empty()) {
+          return end();
+        }
+
+        BOOST_ASSERT(get_allocator() == nh.get_allocator());
+
+        auto itp = table_.insert(std::move(nh.element()));
+        if (itp.second) {
+          nh.reset();
+          return itp.first;
+        } else {
+          return itp.first;
+        }
+      }
+
+      template <class M>
+      std::pair<iterator, bool> insert_or_assign(key_type const& key, M&& obj)
+      {
+        auto ibp = table_.try_emplace(key, std::forward<M>(obj));
+        if (ibp.second) {
+          return ibp;
+        }
+        ibp.first->second = std::forward<M>(obj);
+        return ibp;
+      }
+
+      template <class M>
+      std::pair<iterator, bool> insert_or_assign(key_type&& key, M&& obj)
+      {
+        auto ibp = table_.try_emplace(std::move(key), std::forward<M>(obj));
+        if (ibp.second) {
+          return ibp;
+        }
+        ibp.first->second = std::forward<M>(obj);
+        return ibp;
+      }
+
+      template <class K, class M>
+      typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        std::pair<iterator, bool> >::type
+      insert_or_assign(K&& k, M&& obj)
+      {
+        auto ibp = table_.try_emplace(std::forward<K>(k), std::forward<M>(obj));
+        if (ibp.second) {
+          return ibp;
+        }
+        ibp.first->second = std::forward<M>(obj);
+        return ibp;
+      }
+
+      template <class M>
+      iterator insert_or_assign(const_iterator, key_type const& key, M&& obj)
+      {
+        return this->insert_or_assign(key, std::forward<M>(obj)).first;
+      }
+
+      template <class M>
+      iterator insert_or_assign(const_iterator, key_type&& key, M&& obj)
+      {
+        return this->insert_or_assign(std::move(key), std::forward<M>(obj))
+          .first;
+      }
+
+      template <class K, class M>
+      typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        iterator>::type
+      insert_or_assign(const_iterator, K&& k, M&& obj)
+      {
+        return this->insert_or_assign(std::forward<K>(k), std::forward<M>(obj))
+          .first;
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE std::pair<iterator, bool> emplace(Args&&... args)
+      {
+        return table_.emplace(std::forward<Args>(args)...);
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE iterator emplace_hint(const_iterator, Args&&... args)
+      {
+        return table_.emplace(std::forward<Args>(args)...).first;
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE std::pair<iterator, bool> try_emplace(
+        key_type const& key, Args&&... args)
+      {
+        return table_.try_emplace(key, std::forward<Args>(args)...);
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE std::pair<iterator, bool> try_emplace(
+        key_type&& key, Args&&... args)
+      {
+        return table_.try_emplace(std::move(key), std::forward<Args>(args)...);
+      }
+
+      template <class K, class... Args>
+      BOOST_FORCEINLINE typename std::enable_if<
+        boost::unordered::detail::transparent_non_iterable<K,
+          unordered_node_map>::value,
+        std::pair<iterator, bool> >::type
+      try_emplace(K&& key, Args&&... args)
+      {
+        return table_.try_emplace(
+          std::forward<K>(key), std::forward<Args>(args)...);
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE iterator try_emplace(
+        const_iterator, key_type const& key, Args&&... args)
+      {
+        return table_.try_emplace(key, std::forward<Args>(args)...).first;
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE iterator try_emplace(
+        const_iterator, key_type&& key, Args&&... args)
+      {
+        return table_.try_emplace(std::move(key), std::forward<Args>(args)...)
+          .first;
+      }
+
+      template <class K, class... Args>
+      BOOST_FORCEINLINE typename std::enable_if<
+        boost::unordered::detail::transparent_non_iterable<K,
+          unordered_node_map>::value,
+        iterator>::type
+      try_emplace(const_iterator, K&& key, Args&&... args)
+      {
+        return table_
+          .try_emplace(std::forward<K>(key), std::forward<Args>(args)...)
+          .first;
+      }
+
+      BOOST_FORCEINLINE typename table_type::erase_return_type erase(
+        iterator pos)
+      {
+        return table_.erase(pos);
+      }
+
+      BOOST_FORCEINLINE typename table_type::erase_return_type erase(
+        const_iterator pos)
+      {
+        return table_.erase(pos);
+      }
+
+      iterator erase(const_iterator first, const_iterator last)
+      {
+        while (first != last) {
+          this->erase(first++);
+        }
+        return iterator{detail::foa::const_iterator_cast_tag{}, last};
+      }
+
+      BOOST_FORCEINLINE size_type erase(key_type const& key)
+      {
+        return table_.erase(key);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::transparent_non_iterable<K, unordered_node_map>::value,
+        size_type>::type
+      erase(K const& key)
+      {
+        return table_.erase(key);
+      }
+
+      void swap(unordered_node_map& rhs) noexcept(
+        noexcept(std::declval<table_type&>().swap(std::declval<table_type&>())))
+      {
+        table_.swap(rhs.table_);
+      }
+
+      node_type extract(const_iterator pos)
+      {
+        BOOST_ASSERT(pos != end());
+        node_type nh;
+        auto elem = table_.extract(pos);
+        nh.emplace(std::move(elem), get_allocator());
+        return nh;
+      }
+
+      node_type extract(key_type const& key)
+      {
+        auto pos = find(key);
+        return pos != end() ? extract(pos) : node_type();
+      }
+
+      template <class K>
+      typename std::enable_if<
+        boost::unordered::detail::transparent_non_iterable<K,
+          unordered_node_map>::value,
+        node_type>::type
+      extract(K const& key)
+      {
+        auto pos = find(key);
+        return pos != end() ? extract(pos) : node_type();
+      }
+
+      template <class H2, class P2>
+      void merge(
+        unordered_node_map<key_type, mapped_type, H2, P2, allocator_type>&
+          source)
+      {
+        BOOST_ASSERT(get_allocator() == source.get_allocator());
+        table_.merge(source.table_);
+      }
+
+      template <class H2, class P2>
+      void merge(
+        unordered_node_map<key_type, mapped_type, H2, P2, allocator_type>&&
+          source)
+      {
+        BOOST_ASSERT(get_allocator() == source.get_allocator());
+        table_.merge(std::move(source.table_));
+      }
+
+      /// Lookup
+      ///
+
+      mapped_type& at(key_type const& key)
+      {
+        auto pos = table_.find(key);
+        if (pos != table_.end()) {
+          return pos->second;
+        }
+        // TODO: someday refactor this to conditionally serialize the key and
+        // include it in the error message
+        //
+        boost::throw_exception(
+          std::out_of_range("key was not found in unordered_node_map"));
+      }
+
+      mapped_type const& at(key_type const& key) const
+      {
+        auto pos = table_.find(key);
+        if (pos != table_.end()) {
+          return pos->second;
+        }
+        boost::throw_exception(
+          std::out_of_range("key was not found in unordered_node_map"));
+      }
+
+      template <class K>
+      typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        mapped_type&>::type
+      at(K&& key)
+      {
+        auto pos = table_.find(std::forward<K>(key));
+        if (pos != table_.end()) {
+          return pos->second;
+        }
+        boost::throw_exception(
+          std::out_of_range("key was not found in unordered_node_map"));
+      }
+
+      template <class K>
+      typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        mapped_type const&>::type
+      at(K&& key) const
+      {
+        auto pos = table_.find(std::forward<K>(key));
+        if (pos != table_.end()) {
+          return pos->second;
+        }
+        boost::throw_exception(
+          std::out_of_range("key was not found in unordered_node_map"));
+      }
+
+      BOOST_FORCEINLINE mapped_type& operator[](key_type const& key)
+      {
+        return table_.try_emplace(key).first->second;
+      }
+
+      BOOST_FORCEINLINE mapped_type& operator[](key_type&& key)
+      {
+        return table_.try_emplace(std::move(key)).first->second;
+      }
+
+      template <class K>
+      typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        mapped_type&>::type
+      operator[](K&& key)
+      {
+        return table_.try_emplace(std::forward<K>(key)).first->second;
+      }
+
+      BOOST_FORCEINLINE size_type count(key_type const& key) const
+      {
+        auto pos = table_.find(key);
+        return pos != table_.end() ? 1 : 0;
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value, size_type>::type
+      count(K const& key) const
+      {
+        auto pos = table_.find(key);
+        return pos != table_.end() ? 1 : 0;
+      }
+
+      BOOST_FORCEINLINE iterator find(key_type const& key)
+      {
+        return table_.find(key);
+      }
+
+      BOOST_FORCEINLINE const_iterator find(key_type const& key) const
+      {
+        return table_.find(key);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        iterator>::type
+      find(K const& key)
+      {
+        return table_.find(key);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        const_iterator>::type
+      find(K const& key) const
+      {
+        return table_.find(key);
+      }
+
+      BOOST_FORCEINLINE bool contains(key_type const& key) const
+      {
+        return this->find(key) != this->end();
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        bool>::type
+      contains(K const& key) const
+      {
+        return this->find(key) != this->end();
+      }
+
+      std::pair<iterator, iterator> equal_range(key_type const& key)
+      {
+        auto pos = table_.find(key);
+        if (pos == table_.end()) {
+          return {pos, pos};
+        }
+
+        auto next = pos;
+        ++next;
+        return {pos, next};
+      }
+
+      std::pair<const_iterator, const_iterator> equal_range(
+        key_type const& key) const
+      {
+        auto pos = table_.find(key);
+        if (pos == table_.end()) {
+          return {pos, pos};
+        }
+
+        auto next = pos;
+        ++next;
+        return {pos, next};
+      }
+
+      template <class K>
+      typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value,
+        std::pair<iterator, iterator> >::type
+      equal_range(K const& key)
+      {
+        auto pos = table_.find(key);
+        if (pos == table_.end()) {
+          return {pos, pos};
+        }
+
+        auto next = pos;
+        ++next;
+        return {pos, next};
+      }
+
+      template <class K>
+      typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value,
+        std::pair<const_iterator, const_iterator> >::type
+      equal_range(K const& key) const
+      {
+        auto pos = table_.find(key);
+        if (pos == table_.end()) {
+          return {pos, pos};
+        }
+
+        auto next = pos;
+        ++next;
+        return {pos, next};
+      }
+
+      /// Hash Policy
+      ///
+
+      size_type bucket_count() const noexcept { return table_.capacity(); }
+
+      float load_factor() const noexcept { return table_.load_factor(); }
+
+      float max_load_factor() const noexcept
+      {
+        return table_.max_load_factor();
+      }
+
+      void max_load_factor(float) {}
+
+      size_type max_load() const noexcept { return table_.max_load(); }
+
+      void rehash(size_type n) { table_.rehash(n); }
+
+      void reserve(size_type n) { table_.reserve(n); }
+
+      /// Observers
+      ///
+
+      hasher hash_function() const { return table_.hash_function(); }
+
+      key_equal key_eq() const { return table_.key_eq(); }
+    };
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    bool operator==(
+      unordered_node_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
+      unordered_node_map<Key, T, Hash, KeyEqual, Allocator> const& rhs)
+    {
+      return lhs.table_ == rhs.table_;
+    }
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    bool operator!=(
+      unordered_node_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
+      unordered_node_map<Key, T, Hash, KeyEqual, Allocator> const& rhs)
+    {
+      return !(lhs == rhs);
+    }
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    void swap(unordered_node_map<Key, T, Hash, KeyEqual, Allocator>& lhs,
+      unordered_node_map<Key, T, Hash, KeyEqual, Allocator>& rhs)
+      noexcept(noexcept(lhs.swap(rhs)))
+    {
+      lhs.swap(rhs);
+    }
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator,
+      class Pred>
+    typename unordered_node_map<Key, T, Hash, KeyEqual, Allocator>::size_type
+    erase_if(
+      unordered_node_map<Key, T, Hash, KeyEqual, Allocator>& map, Pred pred)
+    {
+      return erase_if(map.table_, pred);
+    }
+
+    template <class Archive, class Key, class T, class Hash, class KeyEqual,
+      class Allocator>
+    void serialize(Archive& ar,
+      unordered_node_map<Key, T, Hash, KeyEqual, Allocator>& map,
+      unsigned int version)
+    {
+      detail::serialize_container(ar, map, version);
+    }
+
+#if defined(BOOST_MSVC)
+#pragma warning(pop) /* C4714 */
+#endif
+
+#if BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
+
+    template <class InputIterator,
+      class Hash =
+        boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
+      class Pred =
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+      class Allocator = std::allocator<
+        boost::unordered::detail::iter_to_alloc_t<InputIterator> >,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_map(InputIterator, InputIterator,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> unordered_node_map<boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>, Hash, Pred,
+        Allocator>;
+
+    template <class Key, class T,
+      class Hash = boost::hash<std::remove_const_t<Key> >,
+      class Pred = std::equal_to<std::remove_const_t<Key> >,
+      class Allocator = std::allocator<std::pair<const Key, T> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_map(std::initializer_list<std::pair<Key, T> >,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> unordered_node_map<std::remove_const_t<Key>, T, Hash, Pred,
+        Allocator>;
+
+    template <class InputIterator, class Allocator,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_map(InputIterator, InputIterator, std::size_t, Allocator)
+      -> unordered_node_map<boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>,
+        boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+        Allocator>;
+
+    template <class InputIterator, class Allocator,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_map(InputIterator, InputIterator, Allocator)
+      -> unordered_node_map<boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>,
+        boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+        Allocator>;
+
+    template <class InputIterator, class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_map(
+      InputIterator, InputIterator, std::size_t, Hash, Allocator)
+      -> unordered_node_map<boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>, Hash,
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+        Allocator>;
+
+    template <class Key, class T, class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_map(std::initializer_list<std::pair<Key, T> >, std::size_t,
+      Allocator) -> unordered_node_map<std::remove_const_t<Key>, T,
+      boost::hash<std::remove_const_t<Key> >,
+      std::equal_to<std::remove_const_t<Key> >, Allocator>;
+
+    template <class Key, class T, class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_map(std::initializer_list<std::pair<Key, T> >, Allocator)
+      -> unordered_node_map<std::remove_const_t<Key>, T,
+        boost::hash<std::remove_const_t<Key> >,
+        std::equal_to<std::remove_const_t<Key> >, Allocator>;
+
+    template <class Key, class T, class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_map(std::initializer_list<std::pair<Key, T> >, std::size_t,
+      Hash, Allocator) -> unordered_node_map<std::remove_const_t<Key>, T,
+      Hash, std::equal_to<std::remove_const_t<Key> >, Allocator>;
+#endif
+
+  } // namespace unordered
+} // namespace boost
+
+#endif

thirdparty/include/boost/unordered/unordered_node_map_fwd.hpp

@@ -0,0 +1,44 @@
+
+// Copyright (C) 2022 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_NODE_MAP_FWD_HPP_INCLUDED
+#define BOOST_UNORDERED_NODE_MAP_FWD_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <boost/container_hash/hash_fwd.hpp>
+#include <functional>
+#include <memory>
+
+namespace boost {
+  namespace unordered {
+    template <class Key, class T, class Hash = boost::hash<Key>,
+      class KeyEqual = std::equal_to<Key>,
+      class Allocator = std::allocator<std::pair<const Key, T> > >
+    class unordered_node_map;
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    bool operator==(
+      unordered_node_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
+      unordered_node_map<Key, T, Hash, KeyEqual, Allocator> const& rhs);
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    bool operator!=(
+      unordered_node_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
+      unordered_node_map<Key, T, Hash, KeyEqual, Allocator> const& rhs);
+
+    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+    void swap(unordered_node_map<Key, T, Hash, KeyEqual, Allocator>& lhs,
+      unordered_node_map<Key, T, Hash, KeyEqual, Allocator>& rhs)
+      noexcept(noexcept(lhs.swap(rhs)));
+  } // namespace unordered
+
+  using boost::unordered::unordered_node_map;
+} // namespace boost
+
+#endif

thirdparty/include/boost/unordered/unordered_node_set.hpp

@@ -0,0 +1,699 @@
+// Copyright (C) 2022-2023 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_UNORDERED_NODE_SET_HPP_INCLUDED
+#define BOOST_UNORDERED_UNORDERED_NODE_SET_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <boost/unordered/detail/foa/element_type.hpp>
+#include <boost/unordered/detail/foa/node_handle.hpp>
+#include <boost/unordered/detail/foa/node_set_types.hpp>
+#include <boost/unordered/detail/foa/table.hpp>
+#include <boost/unordered/detail/serialize_container.hpp>
+#include <boost/unordered/detail/type_traits.hpp>
+#include <boost/unordered/unordered_node_set_fwd.hpp>
+
+#include <boost/core/allocator_access.hpp>
+#include <boost/container_hash/hash.hpp>
+#include <boost/throw_exception.hpp>
+
+#include <initializer_list>
+#include <iterator>
+#include <type_traits>
+#include <utility>
+
+namespace boost {
+  namespace unordered {
+
+#if defined(BOOST_MSVC)
+#pragma warning(push)
+#pragma warning(disable : 4714) /* marked as __forceinline not inlined */
+#endif
+
+    namespace detail {
+      template <class TypePolicy, class Allocator>
+      struct node_set_handle
+          : public detail::foa::node_handle_base<TypePolicy, Allocator>
+      {
+      private:
+        using base_type = detail::foa::node_handle_base<TypePolicy, Allocator>;
+
+        using typename base_type::type_policy;
+
+        template <class Key, class Hash, class Pred, class Alloc>
+        friend class boost::unordered::unordered_node_set;
+
+      public:
+        using value_type = typename TypePolicy::value_type;
+
+        constexpr node_set_handle() noexcept = default;
+        node_set_handle(node_set_handle&& nh) noexcept = default;
+        node_set_handle& operator=(node_set_handle&&) noexcept = default;
+
+        value_type& value() const
+        {
+          BOOST_ASSERT(!this->empty());
+          return const_cast<value_type&>(this->data());
+        }
+      };
+    } // namespace detail
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    class unordered_node_set
+    {
+      using set_types = detail::foa::node_set_types<Key,
+        typename boost::allocator_void_pointer<Allocator>::type>;
+
+      using table_type = detail::foa::table<set_types, Hash, KeyEqual,
+        typename boost::allocator_rebind<Allocator,
+          typename set_types::value_type>::type>;
+
+      table_type table_;
+
+      template <class K, class H, class KE, class A>
+      bool friend operator==(unordered_node_set<K, H, KE, A> const& lhs,
+        unordered_node_set<K, H, KE, A> const& rhs);
+
+      template <class K, class H, class KE, class A, class Pred>
+      typename unordered_node_set<K, H, KE, A>::size_type friend erase_if(
+        unordered_node_set<K, H, KE, A>& set, Pred pred);
+
+    public:
+      using key_type = Key;
+      using value_type = typename set_types::value_type;
+      using init_type = typename set_types::init_type;
+      using size_type = std::size_t;
+      using difference_type = std::ptrdiff_t;
+      using hasher = Hash;
+      using key_equal = KeyEqual;
+      using allocator_type = Allocator;
+      using reference = value_type&;
+      using const_reference = value_type const&;
+      using pointer = typename boost::allocator_pointer<allocator_type>::type;
+      using const_pointer =
+        typename boost::allocator_const_pointer<allocator_type>::type;
+      using iterator = typename table_type::iterator;
+      using const_iterator = typename table_type::const_iterator;
+      using node_type = detail::node_set_handle<set_types,
+        typename boost::allocator_rebind<Allocator,
+          typename set_types::value_type>::type>;
+      using insert_return_type =
+        detail::foa::insert_return_type<iterator, node_type>;
+
+      unordered_node_set() : unordered_node_set(0) {}
+
+      explicit unordered_node_set(size_type n, hasher const& h = hasher(),
+        key_equal const& pred = key_equal(),
+        allocator_type const& a = allocator_type())
+          : table_(n, h, pred, a)
+      {
+      }
+
+      unordered_node_set(size_type n, allocator_type const& a)
+          : unordered_node_set(n, hasher(), key_equal(), a)
+      {
+      }
+
+      unordered_node_set(size_type n, hasher const& h, allocator_type const& a)
+          : unordered_node_set(n, h, key_equal(), a)
+      {
+      }
+
+      template <class InputIterator>
+      unordered_node_set(
+        InputIterator f, InputIterator l, allocator_type const& a)
+          : unordered_node_set(f, l, size_type(0), hasher(), key_equal(), a)
+      {
+      }
+
+      explicit unordered_node_set(allocator_type const& a)
+          : unordered_node_set(0, a)
+      {
+      }
+
+      template <class Iterator>
+      unordered_node_set(Iterator first, Iterator last, size_type n = 0,
+        hasher const& h = hasher(), key_equal const& pred = key_equal(),
+        allocator_type const& a = allocator_type())
+          : unordered_node_set(n, h, pred, a)
+      {
+        this->insert(first, last);
+      }
+
+      template <class InputIt>
+      unordered_node_set(
+        InputIt first, InputIt last, size_type n, allocator_type const& a)
+          : unordered_node_set(first, last, n, hasher(), key_equal(), a)
+      {
+      }
+
+      template <class Iterator>
+      unordered_node_set(Iterator first, Iterator last, size_type n,
+        hasher const& h, allocator_type const& a)
+          : unordered_node_set(first, last, n, h, key_equal(), a)
+      {
+      }
+
+      unordered_node_set(unordered_node_set const& other) : table_(other.table_)
+      {
+      }
+
+      unordered_node_set(
+        unordered_node_set const& other, allocator_type const& a)
+          : table_(other.table_, a)
+      {
+      }
+
+      unordered_node_set(unordered_node_set&& other)
+        noexcept(std::is_nothrow_move_constructible<table_type>::value)
+          : table_(std::move(other.table_))
+      {
+      }
+
+      unordered_node_set(unordered_node_set&& other, allocator_type const& al)
+          : table_(std::move(other.table_), al)
+      {
+      }
+
+      unordered_node_set(std::initializer_list<value_type> ilist,
+        size_type n = 0, hasher const& h = hasher(),
+        key_equal const& pred = key_equal(),
+        allocator_type const& a = allocator_type())
+          : unordered_node_set(ilist.begin(), ilist.end(), n, h, pred, a)
+      {
+      }
+
+      unordered_node_set(
+        std::initializer_list<value_type> il, allocator_type const& a)
+          : unordered_node_set(il, size_type(0), hasher(), key_equal(), a)
+      {
+      }
+
+      unordered_node_set(std::initializer_list<value_type> init, size_type n,
+        allocator_type const& a)
+          : unordered_node_set(init, n, hasher(), key_equal(), a)
+      {
+      }
+
+      unordered_node_set(std::initializer_list<value_type> init, size_type n,
+        hasher const& h, allocator_type const& a)
+          : unordered_node_set(init, n, h, key_equal(), a)
+      {
+      }
+
+      ~unordered_node_set() = default;
+
+      unordered_node_set& operator=(unordered_node_set const& other)
+      {
+        table_ = other.table_;
+        return *this;
+      }
+
+      unordered_node_set& operator=(unordered_node_set&& other) noexcept(
+        noexcept(std::declval<table_type&>() = std::declval<table_type&&>()))
+      {
+        table_ = std::move(other.table_);
+        return *this;
+      }
+
+      allocator_type get_allocator() const noexcept
+      {
+        return table_.get_allocator();
+      }
+
+      /// Iterators
+      ///
+
+      iterator begin() noexcept { return table_.begin(); }
+      const_iterator begin() const noexcept { return table_.begin(); }
+      const_iterator cbegin() const noexcept { return table_.cbegin(); }
+
+      iterator end() noexcept { return table_.end(); }
+      const_iterator end() const noexcept { return table_.end(); }
+      const_iterator cend() const noexcept { return table_.cend(); }
+
+      /// Capacity
+      ///
+
+      BOOST_ATTRIBUTE_NODISCARD bool empty() const noexcept
+      {
+        return table_.empty();
+      }
+
+      size_type size() const noexcept { return table_.size(); }
+
+      size_type max_size() const noexcept { return table_.max_size(); }
+
+      /// Modifiers
+      ///
+
+      void clear() noexcept { table_.clear(); }
+
+      BOOST_FORCEINLINE std::pair<iterator, bool> insert(
+        value_type const& value)
+      {
+        return table_.insert(value);
+      }
+
+      BOOST_FORCEINLINE std::pair<iterator, bool> insert(value_type&& value)
+      {
+        return table_.insert(std::move(value));
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::transparent_non_iterable<K, unordered_node_set>::value,
+        std::pair<iterator, bool> >::type
+      insert(K&& k)
+      {
+        return table_.try_emplace(std::forward<K>(k));
+      }
+
+      BOOST_FORCEINLINE iterator insert(const_iterator, value_type const& value)
+      {
+        return table_.insert(value).first;
+      }
+
+      BOOST_FORCEINLINE iterator insert(const_iterator, value_type&& value)
+      {
+        return table_.insert(std::move(value)).first;
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::transparent_non_iterable<K, unordered_node_set>::value,
+        iterator>::type
+      insert(const_iterator, K&& k)
+      {
+        return table_.try_emplace(std::forward<K>(k)).first;
+      }
+
+      template <class InputIterator>
+      void insert(InputIterator first, InputIterator last)
+      {
+        for (auto pos = first; pos != last; ++pos) {
+          table_.emplace(*pos);
+        }
+      }
+
+      void insert(std::initializer_list<value_type> ilist)
+      {
+        this->insert(ilist.begin(), ilist.end());
+      }
+
+      insert_return_type insert(node_type&& nh)
+      {
+        if (nh.empty()) {
+          return {end(), false, node_type{}};
+        }
+
+        BOOST_ASSERT(get_allocator() == nh.get_allocator());
+
+        auto itp = table_.insert(std::move(nh.element()));
+        if (itp.second) {
+          nh.reset();
+          return {itp.first, true, node_type{}};
+        } else {
+          return {itp.first, false, std::move(nh)};
+        }
+      }
+
+      iterator insert(const_iterator, node_type&& nh)
+      {
+        if (nh.empty()) {
+          return end();
+        }
+
+        BOOST_ASSERT(get_allocator() == nh.get_allocator());
+
+        auto itp = table_.insert(std::move(nh.element()));
+        if (itp.second) {
+          nh.reset();
+          return itp.first;
+        } else {
+          return itp.first;
+        }
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE std::pair<iterator, bool> emplace(Args&&... args)
+      {
+        return table_.emplace(std::forward<Args>(args)...);
+      }
+
+      template <class... Args>
+      BOOST_FORCEINLINE iterator emplace_hint(const_iterator, Args&&... args)
+      {
+        return table_.emplace(std::forward<Args>(args)...).first;
+      }
+
+      BOOST_FORCEINLINE typename table_type::erase_return_type erase(
+        const_iterator pos)
+      {
+        return table_.erase(pos);
+      }
+
+      iterator erase(const_iterator first, const_iterator last)
+      {
+        while (first != last) {
+          this->erase(first++);
+        }
+        return iterator{detail::foa::const_iterator_cast_tag{}, last};
+      }
+
+      BOOST_FORCEINLINE size_type erase(key_type const& key)
+      {
+        return table_.erase(key);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::transparent_non_iterable<K, unordered_node_set>::value,
+        size_type>::type
+      erase(K const& key)
+      {
+        return table_.erase(key);
+      }
+
+      void swap(unordered_node_set& rhs) noexcept(
+        noexcept(std::declval<table_type&>().swap(std::declval<table_type&>())))
+      {
+        table_.swap(rhs.table_);
+      }
+
+      node_type extract(const_iterator pos)
+      {
+        BOOST_ASSERT(pos != end());
+        node_type nh;
+        auto elem = table_.extract(pos);
+        nh.emplace(std::move(elem), get_allocator());
+        return nh;
+      }
+
+      node_type extract(key_type const& key)
+      {
+        auto pos = find(key);
+        return pos != end() ? extract(pos) : node_type();
+      }
+
+      template <class K>
+      typename std::enable_if<
+        boost::unordered::detail::transparent_non_iterable<K,
+          unordered_node_set>::value,
+        node_type>::type
+      extract(K const& key)
+      {
+        auto pos = find(key);
+        return pos != end() ? extract(pos) : node_type();
+      }
+
+      template <class H2, class P2>
+      void merge(unordered_node_set<key_type, H2, P2, allocator_type>& source)
+      {
+        BOOST_ASSERT(get_allocator() == source.get_allocator());
+        table_.merge(source.table_);
+      }
+
+      template <class H2, class P2>
+      void merge(unordered_node_set<key_type, H2, P2, allocator_type>&& source)
+      {
+        BOOST_ASSERT(get_allocator() == source.get_allocator());
+        table_.merge(std::move(source.table_));
+      }
+
+      /// Lookup
+      ///
+
+      BOOST_FORCEINLINE size_type count(key_type const& key) const
+      {
+        auto pos = table_.find(key);
+        return pos != table_.end() ? 1 : 0;
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value, size_type>::type
+      count(K const& key) const
+      {
+        auto pos = table_.find(key);
+        return pos != table_.end() ? 1 : 0;
+      }
+
+      BOOST_FORCEINLINE iterator find(key_type const& key)
+      {
+        return table_.find(key);
+      }
+
+      BOOST_FORCEINLINE const_iterator find(key_type const& key) const
+      {
+        return table_.find(key);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        iterator>::type
+      find(K const& key)
+      {
+        return table_.find(key);
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        const_iterator>::type
+      find(K const& key) const
+      {
+        return table_.find(key);
+      }
+
+      BOOST_FORCEINLINE bool contains(key_type const& key) const
+      {
+        return this->find(key) != this->end();
+      }
+
+      template <class K>
+      BOOST_FORCEINLINE typename std::enable_if<
+        boost::unordered::detail::are_transparent<K, hasher, key_equal>::value,
+        bool>::type
+      contains(K const& key) const
+      {
+        return this->find(key) != this->end();
+      }
+
+      std::pair<iterator, iterator> equal_range(key_type const& key)
+      {
+        auto pos = table_.find(key);
+        if (pos == table_.end()) {
+          return {pos, pos};
+        }
+
+        auto next = pos;
+        ++next;
+        return {pos, next};
+      }
+
+      std::pair<const_iterator, const_iterator> equal_range(
+        key_type const& key) const
+      {
+        auto pos = table_.find(key);
+        if (pos == table_.end()) {
+          return {pos, pos};
+        }
+
+        auto next = pos;
+        ++next;
+        return {pos, next};
+      }
+
+      template <class K>
+      typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value,
+        std::pair<iterator, iterator> >::type
+      equal_range(K const& key)
+      {
+        auto pos = table_.find(key);
+        if (pos == table_.end()) {
+          return {pos, pos};
+        }
+
+        auto next = pos;
+        ++next;
+        return {pos, next};
+      }
+
+      template <class K>
+      typename std::enable_if<
+        detail::are_transparent<K, hasher, key_equal>::value,
+        std::pair<const_iterator, const_iterator> >::type
+      equal_range(K const& key) const
+      {
+        auto pos = table_.find(key);
+        if (pos == table_.end()) {
+          return {pos, pos};
+        }
+
+        auto next = pos;
+        ++next;
+        return {pos, next};
+      }
+
+      /// Hash Policy
+      ///
+
+      size_type bucket_count() const noexcept { return table_.capacity(); }
+
+      float load_factor() const noexcept { return table_.load_factor(); }
+
+      float max_load_factor() const noexcept
+      {
+        return table_.max_load_factor();
+      }
+
+      void max_load_factor(float) {}
+
+      size_type max_load() const noexcept { return table_.max_load(); }
+
+      void rehash(size_type n) { table_.rehash(n); }
+
+      void reserve(size_type n) { table_.reserve(n); }
+
+      /// Observers
+      ///
+
+      hasher hash_function() const { return table_.hash_function(); }
+
+      key_equal key_eq() const { return table_.key_eq(); }
+    };
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    bool operator==(
+      unordered_node_set<Key, Hash, KeyEqual, Allocator> const& lhs,
+      unordered_node_set<Key, Hash, KeyEqual, Allocator> const& rhs)
+    {
+      return lhs.table_ == rhs.table_;
+    }
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    bool operator!=(
+      unordered_node_set<Key, Hash, KeyEqual, Allocator> const& lhs,
+      unordered_node_set<Key, Hash, KeyEqual, Allocator> const& rhs)
+    {
+      return !(lhs == rhs);
+    }
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    void swap(unordered_node_set<Key, Hash, KeyEqual, Allocator>& lhs,
+      unordered_node_set<Key, Hash, KeyEqual, Allocator>& rhs)
+      noexcept(noexcept(lhs.swap(rhs)))
+    {
+      lhs.swap(rhs);
+    }
+
+    template <class Key, class Hash, class KeyEqual, class Allocator,
+      class Pred>
+    typename unordered_node_set<Key, Hash, KeyEqual, Allocator>::size_type
+    erase_if(unordered_node_set<Key, Hash, KeyEqual, Allocator>& set, Pred pred)
+    {
+      return erase_if(set.table_, pred);
+    }
+
+    template <class Archive, class Key, class Hash, class KeyEqual,
+      class Allocator>
+    void serialize(Archive& ar,
+      unordered_node_set<Key, Hash, KeyEqual, Allocator>& set,
+      unsigned int version)
+    {
+      detail::serialize_container(ar, set, version);
+    }
+
+#if defined(BOOST_MSVC)
+#pragma warning(pop) /* C4714 */
+#endif
+
+#if BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
+    template <class InputIterator,
+      class Hash =
+        boost::hash<typename std::iterator_traits<InputIterator>::value_type>,
+      class Pred =
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+      class Allocator = std::allocator<
+        typename std::iterator_traits<InputIterator>::value_type>,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_set(InputIterator, InputIterator,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> unordered_node_set<
+        typename std::iterator_traits<InputIterator>::value_type, Hash, Pred,
+        Allocator>;
+
+    template <class T, class Hash = boost::hash<T>,
+      class Pred = std::equal_to<T>, class Allocator = std::allocator<T>,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_pred_v<Pred> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_set(std::initializer_list<T>,
+      std::size_t = boost::unordered::detail::foa::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> unordered_node_set<T, Hash, Pred, Allocator>;
+
+    template <class InputIterator, class Allocator,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_set(InputIterator, InputIterator, std::size_t, Allocator)
+      -> unordered_node_set<
+        typename std::iterator_traits<InputIterator>::value_type,
+        boost::hash<typename std::iterator_traits<InputIterator>::value_type>,
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+        Allocator>;
+
+    template <class InputIterator, class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_set(
+      InputIterator, InputIterator, std::size_t, Hash, Allocator)
+      -> unordered_node_set<
+        typename std::iterator_traits<InputIterator>::value_type, Hash,
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+        Allocator>;
+
+    template <class T, class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_set(std::initializer_list<T>, std::size_t, Allocator)
+      -> unordered_node_set<T, boost::hash<T>, std::equal_to<T>, Allocator>;
+
+    template <class T, class Hash, class Allocator,
+      class = std::enable_if_t<detail::is_hash_v<Hash> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_set(std::initializer_list<T>, std::size_t, Hash, Allocator)
+      -> unordered_node_set<T, Hash, std::equal_to<T>, Allocator>;
+
+    template <class InputIterator, class Allocator,
+      class = std::enable_if_t<detail::is_input_iterator_v<InputIterator> >,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_set(InputIterator, InputIterator, Allocator)
+      -> unordered_node_set<
+        typename std::iterator_traits<InputIterator>::value_type,
+        boost::hash<typename std::iterator_traits<InputIterator>::value_type>,
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+        Allocator>;
+
+    template <class T, class Allocator,
+      class = std::enable_if_t<detail::is_allocator_v<Allocator> > >
+    unordered_node_set(std::initializer_list<T>, Allocator)
+      -> unordered_node_set<T, boost::hash<T>, std::equal_to<T>, Allocator>;
+#endif
+
+  } // namespace unordered
+} // namespace boost
+
+#endif

thirdparty/include/boost/unordered/unordered_node_set_fwd.hpp

@@ -0,0 +1,44 @@
+
+// Copyright (C) 2023 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_NODE_SET_FWD_HPP_INCLUDED
+#define BOOST_UNORDERED_NODE_SET_FWD_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <boost/container_hash/hash_fwd.hpp>
+#include <functional>
+#include <memory>
+
+namespace boost {
+  namespace unordered {
+    template <class Key, class Hash = boost::hash<Key>,
+      class KeyEqual = std::equal_to<Key>,
+      class Allocator = std::allocator<Key> >
+    class unordered_node_set;
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    bool operator==(
+      unordered_node_set<Key, Hash, KeyEqual, Allocator> const& lhs,
+      unordered_node_set<Key, Hash, KeyEqual, Allocator> const& rhs);
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    bool operator!=(
+      unordered_node_set<Key, Hash, KeyEqual, Allocator> const& lhs,
+      unordered_node_set<Key, Hash, KeyEqual, Allocator> const& rhs);
+
+    template <class Key, class Hash, class KeyEqual, class Allocator>
+    void swap(unordered_node_set<Key, Hash, KeyEqual, Allocator>& lhs,
+      unordered_node_set<Key, Hash, KeyEqual, Allocator>& rhs)
+      noexcept(noexcept(lhs.swap(rhs)));
+  } // namespace unordered
+
+  using boost::unordered::unordered_node_set;
+} // namespace boost
+
+#endif

thirdparty/include/boost/unordered/unordered_set_fwd.hpp

@@ -0,0 +1,65 @@
+
+// Copyright (C) 2008-2011 Daniel James.
+// Copyright (C) 2022 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNORDERED_SET_FWD_HPP_INCLUDED
+#define BOOST_UNORDERED_SET_FWD_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <boost/container_hash/hash_fwd.hpp>
+#include <functional>
+#include <memory>
+
+namespace boost {
+  namespace unordered {
+    template <class T, class H = boost::hash<T>, class P = std::equal_to<T>,
+      class A = std::allocator<T> >
+    class unordered_set;
+
+    template <class T, class H, class P, class A>
+    inline bool operator==(
+      unordered_set<T, H, P, A> const&, unordered_set<T, H, P, A> const&);
+    template <class T, class H, class P, class A>
+    inline bool operator!=(
+      unordered_set<T, H, P, A> const&, unordered_set<T, H, P, A> const&);
+    template <class T, class H, class P, class A>
+    inline void swap(unordered_set<T, H, P, A>& m1,
+      unordered_set<T, H, P, A>& m2) noexcept(noexcept(m1.swap(m2)));
+
+    template <class K, class H, class P, class A, class Predicate>
+    typename unordered_set<K, H, P, A>::size_type erase_if(
+      unordered_set<K, H, P, A>& c, Predicate pred);
+
+    template <class T, class H = boost::hash<T>, class P = std::equal_to<T>,
+      class A = std::allocator<T> >
+    class unordered_multiset;
+
+    template <class T, class H, class P, class A>
+    inline bool operator==(unordered_multiset<T, H, P, A> const&,
+      unordered_multiset<T, H, P, A> const&);
+    template <class T, class H, class P, class A>
+    inline bool operator!=(unordered_multiset<T, H, P, A> const&,
+      unordered_multiset<T, H, P, A> const&);
+    template <class T, class H, class P, class A>
+    inline void swap(unordered_multiset<T, H, P, A>& m1,
+      unordered_multiset<T, H, P, A>& m2) noexcept(noexcept(m1.swap(m2)));
+
+    template <class K, class H, class P, class A, class Predicate>
+    typename unordered_multiset<K, H, P, A>::size_type erase_if(
+      unordered_multiset<K, H, P, A>& c, Predicate pred);
+
+    template <class N, class T, class A> class node_handle_set;
+    template <class Iter, class NodeType> struct insert_return_type_set;
+  } // namespace unordered
+
+  using boost::unordered::unordered_multiset;
+  using boost::unordered::unordered_set;
+} // namespace boost
+
+#endif