Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+/*=============================================================================
+    Copyright (c) 2014 Kohei Takahashi
+
+    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)
+==============================================================================*/
+#ifndef FUSION_VALUE_AT_IMPL_16122014_1641
+#define FUSION_VALUE_AT_IMPL_16122014_1641
+
+#include <boost/config.hpp>
+#include <boost/fusion/support/config.hpp>
+#include <boost/fusion/container/vector/detail/config.hpp>
+
+///////////////////////////////////////////////////////////////////////////////
+// Without variadics, we will use the PP version
+///////////////////////////////////////////////////////////////////////////////
+#if !defined(BOOST_FUSION_HAS_VARIADIC_VECTOR)
+# include <boost/fusion/container/vector/detail/cpp03/value_at_impl.hpp>
+#else
+
+///////////////////////////////////////////////////////////////////////////////
+// C++11 interface
+///////////////////////////////////////////////////////////////////////////////
+#include <boost/fusion/container/vector/vector_fwd.hpp>
+#include <boost/type_traits/declval.hpp>
+#include <boost/type_traits/remove_cv.hpp>
+
+namespace boost { namespace fusion
+{
+    struct vector_tag;
+
+    namespace vector_detail
+    {
+        template <typename I, typename ...T>
+        struct vector_data;
+    }
+
+    namespace extension
+    {
+        template <typename Tag>
+        struct value_at_impl;
+
+        template <>
+        struct value_at_impl<vector_tag>
+        {
+            template <typename Sequence, typename N>
+            struct apply
+            {
+                typedef typename boost::remove_cv<Sequence>::type seq;
+                typedef typename mpl::identity<decltype(seq::template value_at_impl<N::value>(boost::declval<seq*>()))>::type::type type;
+            };
+        };
+    }
+}}
+
+#endif
+#endif
+