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43 lines
1.3 KiB
C++
43 lines
1.3 KiB
C++
/*=============================================================================
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Copyright (c) 2014 Christoph Weiss
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(FUSION_HASH_23072014_1017)
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#define FUSION_HASH_23072014_1017
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#include <boost/functional/hash.hpp>
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#include <boost/fusion/algorithm/iteration/fold.hpp>
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#include <boost/fusion/support/is_sequence.hpp>
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#include <boost/utility/enable_if.hpp>
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namespace boost { namespace fusion
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{
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namespace hashing
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{
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struct hash_combine_fold
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{
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typedef std::size_t result_type;
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template<typename T>
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inline std::size_t operator()(std::size_t seed, T const& v)
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{
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boost::hash_combine(seed, v);
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return seed;
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}
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};
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template <typename Seq>
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inline typename
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boost::enable_if<traits::is_sequence<Seq>, std::size_t>::type
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hash_value(Seq const& seq)
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{
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return fold(seq, 0, hash_combine_fold());
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}
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}
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using hashing::hash_value;
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}}
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#endif
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