Added boost header

test/external/boost/fusion/sequence/intrinsic/at.hpp

@@ -0,0 +1,111 @@
+/*=============================================================================
+    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_AT_05042005_0722)
+#define FUSION_AT_05042005_0722
+
+#include <boost/mpl/int.hpp>
+#include <boost/type_traits/is_const.hpp>
+#include <boost/fusion/sequence/intrinsic_fwd.hpp>
+#include <boost/fusion/support/tag_of.hpp>
+#include <boost/fusion/support/detail/access.hpp>
+
+namespace boost { namespace fusion
+{
+    // Special tags:
+    struct sequence_facade_tag;
+    struct boost_tuple_tag; // boost::tuples::tuple tag
+    struct boost_array_tag; // boost::array tag
+    struct mpl_sequence_tag; // mpl sequence tag
+    struct std_pair_tag; // std::pair tag
+    struct std_tuple_tag; // std::tuple tag
+
+    namespace extension
+    {
+        template <typename Tag>
+        struct at_impl
+        {
+            template <typename Sequence, typename N>
+            struct apply;
+        };
+
+        template <>
+        struct at_impl<sequence_facade_tag>
+        {
+            template <typename Sequence, typename N>
+            struct apply : Sequence::template at<Sequence, N> {};
+        };
+
+        template <>
+        struct at_impl<boost_tuple_tag>;
+
+        template <>
+        struct at_impl<boost_array_tag>;
+
+        template <>
+        struct at_impl<mpl_sequence_tag>;
+
+        template <>
+        struct at_impl<std_pair_tag>;
+
+        template <>
+        struct at_impl<std_tuple_tag>;
+    }
+
+    namespace result_of
+    {
+        template <typename Sequence, typename N>
+        struct at
+            : extension::at_impl<typename detail::tag_of<Sequence>::type>::
+                template apply<Sequence, N>
+        {};
+
+        template <typename Sequence, int N>
+        struct at_c
+            : at<Sequence, mpl::int_<N> >
+        {};
+    }
+
+
+    template <typename N, typename Sequence>
+    inline typename
+        lazy_disable_if<
+            is_const<Sequence>
+          , result_of::at<Sequence, N>
+        >::type
+    at(Sequence& seq)
+    {
+        return result_of::at<Sequence, N>::call(seq);
+    }
+
+    template <typename N, typename Sequence>
+    inline typename result_of::at<Sequence const, N>::type
+    at(Sequence const& seq)
+    {
+        return result_of::at<Sequence const, N>::call(seq);
+    }
+
+    template <int N, typename Sequence>
+    inline typename
+        lazy_disable_if<
+            is_const<Sequence>
+          , result_of::at_c<Sequence, N>
+        >::type
+    at_c(Sequence& seq)
+    {
+        return fusion::at<mpl::int_<N> >(seq);
+    }
+
+    template <int N, typename Sequence>
+    inline typename result_of::at_c<Sequence const, N>::type
+    at_c(Sequence const& seq)
+    {
+        return fusion::at<mpl::int_<N> >(seq);
+    }
+}}
+
+#endif
+