1 2 #ifndef BOOST_MPL_MAP_AUX_HAS_KEY_IMPL_HPP_INCLUDED 3 #define BOOST_MPL_MAP_AUX_HAS_KEY_IMPL_HPP_INCLUDED 4 5 // Copyright Aleksey Gurtovoy 2003-2004 6 // Copyright David Abrahams 2003-2004 7 // 8 // Distributed under the Boost Software License, Version 1.0. 9 // (See accompanying file LICENSE_1_0.txt or copy at 10 // http://www.boost.org/LICENSE_1_0.txt) 11 // 12 // See http://www.boost.org/libs/mpl for documentation. 13 14 // $Id$ 15 // $Date$ 16 // $Revision$ 17 18 #include <boost/mpl/has_key_fwd.hpp> 19 #include <boost/mpl/map/aux_/tag.hpp> 20 #include <boost/mpl/map/aux_/at_impl.hpp> 21 #include <boost/mpl/void.hpp> 22 #include <boost/mpl/aux_/config/typeof.hpp> 23 24 namespace boost { namespace mpl { 25 26 template<> 27 struct has_key_impl< aux::map_tag > 28 { 29 template< typename Map, typename Key > struct apply 30 #if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES) 31 : is_not_void_< 32 typename at_impl<aux::map_tag> 33 ::apply<Map,Key>::type 34 > 35 #else 36 : bool_< ( x_order_impl<Map,Key>::value > 1 ) > 37 #endif 38 { 39 }; 40 }; 41 42 }} 43 44 #endif // BOOST_MPL_MAP_AUX_HAS_KEY_IMPL_HPP_INCLUDED 45