add boost on mac

macx64/include/boost/gil/extension/toolbox/metafunctions/channel_view.hpp

@@ -0,0 +1,64 @@
+//
+// Copyright 2010 Fabien Castan, Christian Henning
+//
+// 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_CHANNEL_VIEW_HPP
+#define BOOST_GIL_EXTENSION_TOOLBOX_CHANNEL_VIEW_HPP
+
+#include <boost/gil/image_view_factory.hpp>
+
+namespace boost {
+namespace gil {
+
+template < typename Channel
+         , typename View
+         >
+struct channel_type_to_index
+{
+    static const int value = detail::type_to_index< typename color_space_type< View >::type // color (mpl::vector)
+                                                  , Channel                                 // channel type
+                                                  >::value;                           //< index of the channel in the color (mpl::vector)
+};
+
+template< typename Channel
+        , typename View
+        >
+struct channel_view_type : public kth_channel_view_type< channel_type_to_index< Channel
+                                                                              , View
+                                                                              >::value
+                                                       , View
+                                                       >
+{
+    static const int index = channel_type_to_index< Channel
+                                                  , View
+                                                  >::value;
+
+    using parent_t = kth_channel_view_type<index, View>;
+    using type = typename parent_t::type;
+
+    static type make( const View& src )
+    {
+        return parent_t::make( src );
+    }
+};
+
+/// \ingroup ImageViewTransformationsKthChannel
+template< typename Channel
+        , typename View
+        >
+typename channel_view_type< Channel
+                          , View
+                          >::type channel_view( const View& src )
+{
+   return channel_view_type< Channel
+                           , View
+                           >::make( src );
+}
+
+} // namespace gil
+} // namespace boost
+
+#endif