// (C) Copyright Daniel James 2005.
// Use, modification and distribution are subject to 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)
//
// Based on Peter Dimov's proposal
// http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2005/n1756.pdf
// issue 6.18.
#if !defined(BOOST_FUNCTIONAL_HASH_PAIR_HPP)
#define BOOST_FUNCTIONAL_HASH_PAIR_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <boost/config.hpp>
#include <utility>
#include <boost/functional/hash/hash.hpp>
namespace boost
{
template <class A, class B>
std::size_t hash_value(std::pair<A, B> const& v)
{
std::size_t seed = 0;
hash_combine(seed, v.first);
hash_combine(seed, v.second);
return seed;
}
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
namespace hash_detail
{
template <class A, class B>
struct call_hash<std::pair<A, B> >
{
static std::size_t call(std::pair<A, B> const& val)
{
return boost::hash_value(val);
}
};
}
#endif
}
#endif