Added thirdparty: boost library

thirdparty/include/boost/multiprecision/detail/hash.hpp

@@ -0,0 +1,56 @@
+///////////////////////////////////////////////////////////////////////////////
+//  Copyright 2021 Matt Borland. 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_MP_DETAIL_HASH_HPP
+#define BOOST_MP_DETAIL_HASH_HPP
+
+#include <cstddef>
+#include <functional>
+#include <boost/multiprecision/detail/standalone_config.hpp>
+
+namespace boost { namespace multiprecision { namespace detail {
+
+template <typename T>
+inline std::size_t hash_value(const T& v)
+{
+    std::hash<T> hasher;
+    return hasher(v);
+}
+
+#if defined(BOOST_HAS_INT128)
+
+std::size_t hash_value(const uint128_type& val);
+
+inline std::size_t hash_value(const int128_type& val)
+{
+   return hash_value(static_cast<uint128_type>(val));
+}
+
+#endif
+
+inline void hash_combine(std::size_t&) {}
+
+template <typename T, typename... Args>
+inline void hash_combine(std::size_t& seed, const T& v, Args... args) 
+{
+    constexpr std::size_t adder = 0x9e3779b9;
+    seed = seed ^ (hash_value(v) + adder + (seed<<6) + (seed>>2));
+    hash_combine(seed, args...);
+}
+
+#if defined(BOOST_HAS_INT128)
+
+inline std::size_t hash_value(const uint128_type& val)
+{
+   std::size_t result = static_cast<std::size_t>(val);
+   hash_combine(result, static_cast<std::size_t>(val >> 64));
+   return result;
+}
+
+#endif
+
+}}} // Namespaces
+
+#endif // BOOST_MP_DETAIL_HASH_HPP