1 2 #ifndef BOOST_MPL_MAP_AUX_CONTAINS_IMPL_HPP_INCLUDED 3 #define BOOST_MPL_MAP_AUX_CONTAINS_IMPL_HPP_INCLUDED 4 5 // Copyright Aleksey Gurtovoy 2003-2004 6 // 7 // Distributed under the Boost Software License, Version 1.0. 8 // (See accompanying file LICENSE_1_0.txt or copy at 9 // http://www.boost.org/LICENSE_1_0.txt) 10 // 11 // See http://www.boost.org/libs/mpl for documentation. 12 13 // $Id$ 14 // $Date$ 15 // $Revision$ 16 17 #include <boost/mpl/contains_fwd.hpp> 18 #include <boost/mpl/if.hpp> 19 #include <boost/mpl/map/aux_/at_impl.hpp> 20 #include <boost/mpl/map/aux_/tag.hpp> 21 22 #include <boost/type_traits/is_same.hpp> 23 24 namespace boost { namespace mpl { 25 26 template<> 27 struct contains_impl< aux::map_tag > 28 { 29 template< typename Map, typename Pair > struct apply 30 : is_same< 31 typename at_impl<aux::map_tag>::apply< 32 Map 33 , typename Pair::first 34 >::type 35 , typename Pair::second 36 > 37 { 38 }; 39 }; 40 41 }} 42 43 #endif // BOOST_MPL_MAP_AUX_CONTAINS_IMPL_HPP_INCLUDED 44