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: 2008-10-10 23:19:02 -0700 (Fri, 10 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
40