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1 | /*============================================================================= |
2 | Copyright (c) 2014 Christoph Weiss | |
3 | ||
4 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
6 | ==============================================================================*/ | |
7 | #if !defined(FUSION_HASH_23072014_1017) | |
8 | #define FUSION_HASH_23072014_1017 | |
9 | ||
10 | #include <boost/functional/hash.hpp> | |
11 | #include <boost/fusion/algorithm/iteration/fold.hpp> | |
12 | #include <boost/fusion/support/is_sequence.hpp> | |
13 | #include <boost/utility/enable_if.hpp> | |
14 | ||
15 | namespace boost { namespace fusion | |
16 | { | |
17 | namespace hashing | |
18 | { | |
19 | struct hash_combine_fold | |
20 | { | |
21 | typedef std::size_t result_type; | |
22 | template<typename T> | |
23 | inline std::size_t operator()(std::size_t seed, T const& v) | |
24 | { | |
25 | boost::hash_combine(seed, v); | |
26 | return seed; | |
27 | } | |
28 | }; | |
29 | ||
30 | template <typename Seq> | |
31 | inline typename | |
32 | boost::enable_if<traits::is_sequence<Seq>, std::size_t>::type | |
33 | hash_value(Seq const& seq) | |
34 | { | |
35 | return fold(seq, 0, hash_combine_fold()); | |
36 | } | |
37 | } | |
38 | ||
39 | using hashing::hash_value; | |
40 | }} | |
41 | ||
42 | #endif |