1 2 #ifndef BOOST_MPL_HAS_KEY_HPP_INCLUDED 3 #define BOOST_MPL_HAS_KEY_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: has_key.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ 15 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ 16 // $Revision: 49267 $ 17 18 #include <boost/mpl/has_key_fwd.hpp> 19 #include <boost/mpl/sequence_tag.hpp> 20 #include <boost/mpl/aux_/has_key_impl.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(Key) 29 > 30 struct has_key 31 : has_key_impl< typename sequence_tag<AssociativeSequence>::type > 32 ::template apply<AssociativeSequence,Key> 33 { 34 BOOST_MPL_AUX_LAMBDA_SUPPORT(2,has_key,(AssociativeSequence,Key)) 35 }; 36 37 BOOST_MPL_AUX_NA_SPEC(2, has_key) 38 39 }} 40 41 #endif // BOOST_MPL_HAS_KEY_HPP_INCLUDED 42