Initial move from Spirit CVS

[SVN r34896]

include/boost/fusion/sequence/intrinsic/begin.hpp

@@ -0,0 +1,51 @@
+/*=============================================================================
+    Copyright (c) 2001-2006 Joel de Guzman
+
+    Use, modification and distribution is subject to 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_BEGIN_04052005_1132)
+#define FUSION_BEGIN_04052005_1132
+
+#include <boost/fusion/support/tag_of.hpp>
+
+namespace boost { namespace fusion
+{
+    struct fusion_sequence_tag;
+
+    namespace extension
+    {
+        template <typename Tag>
+        struct begin_impl
+        {
+            template <typename Sequence>
+            struct apply;
+        };
+    }
+
+    namespace result_of
+    {
+        template <typename Sequence>
+        struct begin
+            : extension::begin_impl<typename detail::tag_of<Sequence>::type>::
+                template apply<Sequence>
+        {};
+    }
+
+    template <typename Sequence>
+    inline typename result_of::begin<Sequence>::type
+    begin(Sequence& seq)
+    {
+        return result_of::begin<Sequence>::call(seq);
+    }
+
+    template <typename Sequence>
+    inline typename result_of::begin<Sequence const>::type
+    begin(Sequence const& seq)
+    {
+        return result_of::begin<Sequence const>::call(seq);
+    }
+}}
+
+#endif