source: NonGTP/Boost/boost/functional/hash/pair.hpp @ 857

Revision 857, 1.2 KB checked in by igarcia, 19 years ago (diff)
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[857]1
2//  (C) Copyright Daniel James 2005.
3//  Use, modification and distribution are subject to the
4//  Boost Software License, Version 1.0. (See accompanying file
5//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6//
7//  Based on Peter Dimov's proposal
8//  http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2005/n1756.pdf
9//  issue 6.18.
10
11#if !defined(BOOST_FUNCTIONAL_HASH_PAIR_HPP)
12#define BOOST_FUNCTIONAL_HASH_PAIR_HPP
13
14#if defined(_MSC_VER) && (_MSC_VER >= 1020)
15# pragma once
16#endif
17
18#include <boost/config.hpp>
19#include <utility>
20#include <boost/functional/hash/hash.hpp>
21
22namespace boost
23{
24    template <class A, class B>
25    std::size_t hash_value(std::pair<A, B> const& v)
26    {
27        std::size_t seed = 0;
28        hash_combine(seed, v.first);
29        hash_combine(seed, v.second);
30        return seed;
31    }
32
33#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
34    namespace hash_detail
35    {
36        template <class A, class B>
37        struct call_hash<std::pair<A, B> >
38        {
39            static std::size_t call(std::pair<A, B> const& val)
40            {
41                return boost::hash_value(val);
42            }
43        };
44    }
45#endif
46}
47
48#endif
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