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