1 2 #ifndef BOOST_MPL_SET_AUX_AT_IMPL_HPP_INCLUDED 3 #define BOOST_MPL_SET_AUX_AT_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/at_fwd.hpp> 18 #include <boost/mpl/set/aux_/has_key_impl.hpp> 19 #include <boost/mpl/set/aux_/tag.hpp> 20 #include <boost/mpl/if.hpp> 21 #include <boost/mpl/void.hpp> 22 23 namespace boost { namespace mpl { 24 25 template<> 26 struct at_impl< aux::set_tag > 27 { 28 template< typename Set, typename T > struct apply 29 { 30 typedef typename if_< 31 has_key_impl<aux::set_tag>::apply<Set,T> 32 , T 33 , void_ 34 >::type type; 35 }; 36 }; 37 38 }} 39 40 #endif // BOOST_MPL_SET_AUX_AT_IMPL_HPP_INCLUDED 41