1 files changed, 42 insertions, 0 deletions
diff --git a/boost/fusion/sequence/hash.hpp b/boost/fusion/sequence/hash.hpp
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+++ b/boost/fusion/sequence/hash.hpp
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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