experimental segmented Fusion support

[SVN r35493]

include/boost/fusion/sequence/intrinsic/ext_/segments.hpp

@@ -0,0 +1,57 @@
+/*=============================================================================
+    Copyright (c) 2006 Eric Niebler
+
+    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_SEGMENTS_04052005_1141)
+#define FUSION_SEGMENTS_04052005_1141
+
+#include <boost/fusion/support/tag_of.hpp>
+
+namespace boost { namespace fusion
+{
+    // segments: returns a sequence of sequences
+    namespace extension
+    {
+        template <typename Tag>
+        struct segments_impl
+        {
+            template <typename Sequence>
+            struct apply {};
+        };
+    }
+
+    namespace result_of
+    {
+        template <typename Sequence>
+        struct segments
+        {
+            typedef typename
+                extension::segments_impl<typename traits::tag_of<Sequence>::type>::
+                    template apply<Sequence>::type
+            type;
+        };
+    }
+
+    template <typename Sequence>
+    typename result_of::segments<Sequence>::type
+    segments(Sequence & seq)
+    {
+        return
+            extension::segments_impl<typename traits::tag_of<Sequence>::type>::
+                template apply<Sequence>::call(seq);
+    }
+
+    template <typename Sequence>
+    typename result_of::segments<Sequence const>::type
+    segments(Sequence const& seq)
+    {
+        return
+            extension::segments_impl<typename traits::tag_of<Sequence>::type>::
+                template apply<Sequence const>::call(seq);
+    }
+}}
+
+#endif