branch for creating branch for fusion 2.1

[SVN r40237]

include/boost/fusion/adapted/struct/extension.hpp

@@ -0,0 +1,68 @@
+/*=============================================================================
+    Copyright (c) 2001-2007 Joel de Guzman
+    Copyright (c) 2005-2006 Dan Marsden
+
+    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_STRUCT_EXTENSION_APRIL_2_2007_1008AM)
+#define FUSION_STRUCT_EXTENSION_APRIL_2_2007_1008AM
+
+#include <boost/type_traits/add_const.hpp>
+
+namespace boost { namespace fusion { namespace extension
+{
+    template <typename Struct, int N>
+    struct struct_member;
+
+    template <typename Struct>
+    struct struct_size;
+
+    template <typename Struct, int N>
+    struct struct_member<Struct const, N>
+    {
+        typedef typename
+            add_const<typename struct_member<Struct, N>::type>::type
+        type;
+
+        static type&
+        call(Struct const& struct_)
+        {
+            return struct_member<Struct, N>::call(
+                const_cast<Struct&>(struct_));
+        }
+    };
+
+    template <typename Struct>
+    struct struct_size<Struct const>
+        : struct_size<Struct>
+    {};
+
+    struct no_such_member;
+
+    template<typename Struct, typename Key>
+    struct struct_assoc_member
+    {
+        typedef no_such_member type;
+    };
+
+    template<typename Struct, typename Key>
+    struct struct_assoc_member<Struct const, Key>
+    {
+        typedef typename
+        add_const<typename struct_assoc_member<Struct, Key>::type>::type
+        type;
+
+        static type&
+        call(Struct const& struct_)
+        {
+            return struct_assoc_member<Struct, Key>::call(
+                const_cast<Struct&>(struct_));
+        }
+    };
+
+}}}
+
+#endif
+
+