Initial move from Spirit CVS

[SVN r34896]

include/boost/fusion/support/is_associative.hpp

@@ -0,0 +1,36 @@
+/*=============================================================================
+    Copyright (c) 2001-2006 Joel de Guzman
+    Copyright (c) 2006 Dan Marsden
+
+    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_ASSOCIATIVE_09242005_1018)
+#define FUSION_IS_ASSOCIATIVE_09242005_1018
+
+#include <boost/mpl/bool.hpp>
+#include <boost/fusion/support/tag_of.hpp>
+
+namespace boost { namespace fusion {
+    namespace extension
+    {
+      template<typename Tag>
+      struct is_associative_impl
+      {
+        template<typename Seq>
+        struct apply
+          : mpl::false_
+        {};
+      };
+    }
+
+    namespace traits
+    {
+      template <typename Seq>
+      struct is_associative
+        : extension::is_associative_impl<typename detail::tag_of<Seq>::type>::template apply<Seq>
+      {};
+}}}
+
+#endif