adding fusion docs and tests

[SVN r34920]

example/extension/detail/is_view_impl.hpp

@@ -0,0 +1,30 @@
+/*=============================================================================
+    Copyright (c) 2001-2006 Joel de Guzman
+    Copyright (c) 2005-2006 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(BOOST_FUSION_IS_VIEW_IMPL_200604227_2150)
+#define BOOST_FUSION_IS_VIEW_IMPL_200604227_2150
+
+#include <boost/mpl/bool.hpp>
+
+namespace boost { namespace fusion 
+{
+  struct example_sequence_tag;
+
+  namespace extension
+  {
+    template<typename Tag>
+    struct is_view_impl;
+
+    template<>
+    struct is_view_impl<example_sequence_tag>
+      : boost::mpl::false_
+    {};
+  }
+}}
+
+#endif