1 2 #ifndef BOOST_MPL_ALWAYS_HPP_INCLUDED 3 #define BOOST_MPL_ALWAYS_HPP_INCLUDED 4 5 // Copyright Aleksey Gurtovoy 2001-2004 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/aux_/preprocessor/default_params.hpp> 18 #include <boost/mpl/aux_/na.hpp> 19 #include <boost/mpl/aux_/arity_spec.hpp> 20 21 namespace boost { namespace mpl { 22 23 template< typename Value > struct always 24 { 25 template< 26 BOOST_MPL_PP_DEFAULT_PARAMS(BOOST_MPL_LIMIT_METAFUNCTION_ARITY, typename T, na) 27 > 28 struct apply 29 { 30 typedef Value type; 31 }; 32 }; 33 34 BOOST_MPL_AUX_ARITY_SPEC(0, always) 35 36 }} 37 38 #endif // BOOST_MPL_ALWAYS_HPP_INCLUDED 39