63e88f80
 Hu Chunming
提交三方库
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///////////////////////////////////////////////////////////////////////////////
// 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
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