boost/mpl/always.hpp

0001
0002 #ifndef BOOST_MPL_ALWAYS_HPP_INCLUDED
0003 #define BOOST_MPL_ALWAYS_HPP_INCLUDED
0004
0005 // Copyright Aleksey Gurtovoy 2001-2004
0006 //
0007 // Distributed under the Boost Software License, Version 1.0.
0008 // (See accompanying file LICENSE_1_0.txt or copy at
0009 // http://www.boost.org/LICENSE_1_0.txt)
0010 //
0011 // See http://www.boost.org/libs/mpl for documentation.
0012
0013 // $Id$
0014 // $Date$
0015 // $Revision$
0016
0017 #include <boost/mpl/aux_/preprocessor/default_params.hpp>
0018 #include <boost/mpl/aux_/na.hpp>
0019 #include <boost/mpl/aux_/arity_spec.hpp>
0020
0021 namespace boost { namespace mpl {
0022
0023 template< typename Value > struct always
0024 {
0025     template<
0026         BOOST_MPL_PP_DEFAULT_PARAMS(BOOST_MPL_LIMIT_METAFUNCTION_ARITY, typename T, na)
0027         >
0028     struct apply
0029     {
0030         typedef Value type;
0031     };
0032 };
0033
0034 BOOST_MPL_AUX_ARITY_SPEC(0, always)
0035
0036 }}
0037
0038 #endif // BOOST_MPL_ALWAYS_HPP_INCLUDED