Added thirdparty: boost library

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