update boost on linux

linx64/include/boost/gil/extension/toolbox/metafunctions/is_similar.hpp

@@ -0,0 +1,32 @@
+//
+// Copyright 2012 Christian Henning, Andreas Pokorny, Lubomir Bourdev
+//
+// 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
+//
+#ifndef BOOST_GIL_EXTENSION_TOOLBOX_METAFUNCTIONS_IS_SIMILAR_HPP
+#define BOOST_GIL_EXTENSION_TOOLBOX_METAFUNCTIONS_IS_SIMILAR_HPP
+
+#include <boost/gil/channel.hpp>
+
+namespace boost{ namespace gil {
+
+/// is_similar metafunctions
+/// \brief Determines if two pixel types are similar.
+
+template< typename A, typename B >
+struct is_similar : mpl::false_ {};
+
+template<typename A>
+struct is_similar< A, A > : mpl::true_ {};
+
+template<typename B,int I, int S, bool M, int I2>
+struct is_similar< packed_channel_reference< B,  I, S, M >
+                 , packed_channel_reference< B, I2, S, M >
+                 > : mpl::true_ {};
+
+} // namespace gil
+} // namespace boost
+
+#endif