phase3: refactoring for v2.1

[SVN r40211]

include/boost/fusion/mpl/clear.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_CLEAR_10022005_1817)
+#define FUSION_CLEAR_10022005_1817
+
+#include <boost/mpl/clear.hpp>
+#include <boost/fusion/support/tag_of.hpp>
+#include <boost/fusion/mpl/detail/clear.hpp>
+
+namespace boost { namespace mpl
+{
+    template <typename Tag>
+    struct clear_impl;
+
+    template <>
+    struct clear_impl<fusion::fusion_sequence_tag>
+    {
+        template <typename Sequence>
+        struct apply
+        {            
+            typedef typename 
+                fusion::detail::clear<typename fusion::detail::tag_of<Sequence>::type>::type 
+            type;
+        };
+    };
+}}
+
+#endif
+