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/*=============================================================================
Copyright (c) 2014 Christoph Weiss
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)
==============================================================================*/
#if !defined(FUSION_HASH_23072014_1017)
#define FUSION_HASH_23072014_1017
#include <boost/functional/hash.hpp>
#include <boost/fusion/algorithm/iteration/fold.hpp>
#include <boost/fusion/support/is_sequence.hpp>
#include <boost/utility/enable_if.hpp>
namespace boost { namespace fusion
{
namespace hashing
{
struct hash_combine_fold
{
typedef std::size_t result_type;
template<typename T>
inline std::size_t operator()(std::size_t seed, T const& v)
{
boost::hash_combine(seed, v);
return seed;
}
};
template <typename Seq>
inline typename
boost::enable_if<traits::is_sequence<Seq>, std::size_t>::type
hash_value(Seq const& seq)
{
return fold(seq, 0, hash_combine_fold());
}
}
using hashing::hash_value;
}}
#endif
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