1 files changed, 88 insertions, 0 deletions
diff --git a/boost/fusion/sequence/intrinsic/size.hpp b/boost/fusion/sequence/intrinsic/size.hpp
new file mode 100644
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+++ b/boost/fusion/sequence/intrinsic/size.hpp
@@ -0,0 +1,88 @@
+/*=============================================================================
+    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_SIZE_05052005_0214)
+#define FUSION_SIZE_05052005_0214
+
+#include <boost/utility/enable_if.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/int.hpp>
+#include <boost/fusion/sequence/intrinsic_fwd.hpp>
+#include <boost/fusion/support/tag_of.hpp>
+#include <boost/fusion/support/is_segmented.hpp>
+#include <boost/fusion/sequence/intrinsic/detail/segmented_size.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
+
+    namespace extension
+    {
+        template <typename Tag>
+        struct size_impl
+        {
+            template<typename Sequence>
+            struct unsegmented_size : Sequence::size {};
+
+            template <typename Sequence>
+            struct apply
+              : mpl::if_<
+                    traits::is_segmented<Sequence>
+                  , detail::segmented_size<Sequence>
+                  , unsegmented_size<Sequence>
+                >::type
+            {};
+        };
+
+        template <>
+        struct size_impl<sequence_facade_tag>
+        {
+            template <typename Sequence>
+            struct apply : Sequence::template size<Sequence> {};
+        };
+ 
+        template <>
+        struct size_impl<boost_tuple_tag>;
+ 
+        template <>
+        struct size_impl<boost_array_tag>;
+
+        template <>
+        struct size_impl<mpl_sequence_tag>;
+
+        template <>
+        struct size_impl<std_pair_tag>;
+    }
+
+    namespace result_of
+    {
+        template <typename Sequence>
+        struct size
+            : extension::size_impl<typename detail::tag_of<Sequence>::type>::
+        template apply<Sequence>
+
+        {
+            typedef typename extension::size_impl<typename detail::tag_of<Sequence>::type>::
+            template apply<Sequence>::type size_application;
+            BOOST_STATIC_CONSTANT(int, value = size_application::value);
+        };
+    }
+
+    template <typename Sequence>
+    inline typename result_of::size<Sequence>::type
+    size(Sequence const&)
+    {
+        typedef typename result_of::size<Sequence>::type result;
+        return result();
+    }
+}}
+
+#endif