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: always.hpp 49267 2008-10-11 06:19:02Z agurtovoy $

    14 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $

    15 // $Revision: 49267 $

    16 

    17 #include <boost/mpl/aux_/preprocessor/def_params_tail.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           typename T

    27         BOOST_MPL_PP_NESTED_DEF_PARAMS_TAIL(1, typename T, na)

    28         >

    29     struct apply

    30     {

    31         typedef Value type;

    32     };

    33 };

    34 

    35 BOOST_MPL_AUX_ARITY_SPEC(1, always)

    36 

    37 }}

    38 

    39 #endif // BOOST_MPL_ALWAYS_HPP_INCLUDED