Updated boost to v1.55.0

[rsem.git] / boost / fusion / container / list / detail / value_at_impl.hpp

diff --git a/boost/fusion/container/list/detail/value_at_impl.hpp b/boost/fusion/container/list/detail/value_at_impl.hpp
new file mode 100644 (file)
index 0000000..353f8d5
--- /dev/null
+++ b/boost/fusion/container/list/detail/value_at_impl.hpp
@@ -0,0 +1,42 @@
+/*=============================================================================
+    Copyright (c) 2001-2011 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(FUSION_VALUE_AT_IMPL_07172005_0952)
+#define FUSION_VALUE_AT_IMPL_07172005_0952
+
+#include <boost/fusion/support/detail/access.hpp>
+#include <boost/type_traits/is_const.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/bool.hpp>
+
+namespace boost { namespace fusion
+{
+    struct cons_tag;
+
+    namespace extension
+    {
+        template <typename Tag>
+        struct value_at_impl;
+
+        template <>
+        struct value_at_impl<cons_tag>
+        {
+            template <typename Sequence, typename N>
+            struct apply 
+            {
+                typedef typename 
+                    mpl::eval_if<
+                        mpl::bool_<N::value == 0>
+                      , mpl::identity<typename Sequence::car_type>
+                      , apply<typename Sequence::cdr_type, mpl::int_<N::value-1> >
+                    >::type
+                type;
+            };
+        };
+    }
+}}
+
+#endif