Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+/*=============================================================================
+    Copyright (c) 2005-2012 Joel de Guzman
+    Copyright (c) 2005-2006 Dan Marsden
+
+    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_DEQUE_VALUE_AT_IMPL_08122006_0756)
+#define BOOST_FUSION_DEQUE_VALUE_AT_IMPL_08122006_0756
+
+#include <boost/fusion/support/config.hpp>
+#include <boost/fusion/container/deque/detail/keyed_element.hpp>
+
+#include <boost/mpl/equal_to.hpp>
+#include <boost/mpl/assert.hpp>
+
+namespace boost { namespace fusion
+{
+    struct deque_tag;
+
+    namespace extension
+    {
+        template<typename T>
+        struct value_at_impl;
+
+        template<>
+        struct value_at_impl<deque_tag>
+        {
+            template<typename Sequence, typename N>
+            struct apply
+            {
+                typedef typename Sequence::next_up next_up;
+                typedef typename Sequence::next_down next_down;
+                BOOST_MPL_ASSERT_RELATION(next_down::value, !=, next_up::value);
+
+                static int const offset = next_down::value + 1;
+                typedef mpl::int_<(N::value + offset)> adjusted_index;
+                typedef typename
+                    detail::keyed_element_value_at<Sequence, adjusted_index>::type
+                type;
+            };
+        };
+    }
+}}
+
+#endif