Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+/*=============================================================================
+    Copyright (c) 2001-2013 Joel de Guzman
+
+    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(BOOST_FUSION_MAP_DETAIL_VALUE_AT_IMPL_02042013_0821)
+#define BOOST_FUSION_MAP_DETAIL_VALUE_AT_IMPL_02042013_0821
+
+#include <boost/fusion/support/config.hpp>
+#include <boost/mpl/at.hpp>
+#include <boost/utility/declval.hpp>
+
+namespace boost { namespace fusion
+{
+    struct map_tag;
+
+    namespace extension
+    {
+        template <typename Tag>
+        struct value_at_impl;
+
+        template <>
+        struct value_at_impl<map_tag>
+        {
+            template <typename Sequence, typename N>
+            struct apply
+            {
+                typedef mpl::int_<N::value> index;
+                typedef
+                    decltype(boost::declval<Sequence>().get_val(index()))
+                type;
+            };
+        };
+    }
+}}
+
+#endif
+