experimental segmented Fusion support

[SVN r35493]

include/boost/fusion/support/ext_/is_segmented.hpp

@@ -0,0 +1,49 @@
+/*=============================================================================
+    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_IS_SEGMENTED_03202006_0015)
+#define FUSION_IS_SEGMENTED_03202006_0015
+
+#include <boost/fusion/support/tag_of.hpp>
+
+namespace boost { namespace fusion 
+{
+    // Special tags:
+    struct sequence_facade_tag;
+    struct boost_tuple_tag; // boost::tuples::tuple tag
+    struct array_tag; // boost::array tag
+    struct mpl_sequence_tag; // mpl sequence tag
+    struct std_pair_tag; // std::pair tag
+    struct iterator_range_tag;
+
+    namespace extension
+    {
+        template<typename Tag>
+        struct is_segmented_impl
+        {
+            template<typename Sequence>
+            struct apply
+              : mpl::false_
+            {};
+        };
+
+        template<>
+        struct is_segmented_impl<iterator_range_tag>;
+    }
+
+    namespace traits
+    {
+        template <typename Sequence>
+        struct is_segmented
+          : extension::is_segmented_impl<typename traits::tag_of<Sequence>::type>::
+                template apply<Sequence>
+        {
+        };
+    }
+}}
+
+#endif