1 2 #ifndef BOOST_MPL_KEY_TYPE_HPP_INCLUDED 3 #define BOOST_MPL_KEY_TYPE_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/key_type_fwd.hpp> 19 #include <boost/mpl/sequence_tag.hpp> 20 #include <boost/mpl/apply_wrap.hpp> 21 #include <boost/mpl/aux_/na_spec.hpp> 22 #include <boost/mpl/aux_/lambda_support.hpp> 23 24 namespace boost { namespace mpl { 25 26 template< 27 typename BOOST_MPL_AUX_NA_PARAM(AssociativeSequence) 28 , typename BOOST_MPL_AUX_NA_PARAM(T) 29 > 30 struct key_type 31 : apply_wrap2< 32 key_type_impl< typename sequence_tag<AssociativeSequence>::type > 33 , AssociativeSequence, T> 34 { 35 BOOST_MPL_AUX_LAMBDA_SUPPORT(2,key_type,(AssociativeSequence,T)) 36 }; 37 38 BOOST_MPL_AUX_NA_SPEC(2, key_type) 39 40 }} 41 42 #endif // BOOST_MPL_KEY_TYPE_HPP_INCLUDED 43