creating branch for fusion 2.1

[SVN r40232]

include/boost/fusion/mpl/at.hpp

@@ -0,0 +1,33 @@
+/*=============================================================================
+    Copyright (c) 2001-2006 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_10022005_1616)
+#define FUSION_AT_10022005_1616
+
+#include <boost/mpl/at.hpp>
+#include <boost/fusion/sequence/intrinsic/value_at.hpp>
+
+namespace boost { 
+namespace fusion
+{
+    struct fusion_sequence_tag;
+}
+
+namespace mpl
+{
+    template <typename Tag>
+    struct at_impl;
+
+    template <>
+    struct at_impl<fusion::fusion_sequence_tag>
+    {
+        template <typename Sequence, typename N>
+        struct apply : fusion::result_of::value_at<Sequence, N> {};
+    };
+}}
+
+#endif
+