map/aux_/empty_impl.hpp

0001
0002 #ifndef BOOST_MPL_MAP_AUX_EMPTY_IMPL_HPP_INCLUDED
0003 #define BOOST_MPL_MAP_AUX_EMPTY_IMPL_HPP_INCLUDED
0004
0005 // Copyright Aleksey Gurtovoy 2003-2004
0006 //
0007 // Distributed under the Boost Software License, Version 1.0.
0008 // (See accompanying file LICENSE_1_0.txt or copy at
0009 // http://www.boost.org/LICENSE_1_0.txt)
0010 //
0011 // See http://www.boost.org/libs/mpl for documentation.
0012
0013 // $Id$
0014 // $Date$
0015 // $Revision$
0016
0017 #include <boost/mpl/empty_fwd.hpp>
0018 #include <boost/mpl/not.hpp>
0019 #include <boost/mpl/map/aux_/tag.hpp>
0020
0021 namespace boost { namespace mpl {
0022
0023 template<>
0024 struct empty_impl< aux::map_tag >
0025 {
0026     template< typename Map > struct apply
0027         : not_< typename Map::size >
0028     {
0029     };
0030 };
0031
0032 }}
0033
0034 #endif // BOOST_MPL_MAP_AUX_EMPTY_IMPL_HPP_INCLUDED