1 
2 #ifndef BOOST_MPL_AUX_YES_NO_HPP_INCLUDED
3 #define BOOST_MPL_AUX_YES_NO_HPP_INCLUDED
4 
5 // Copyright Aleksey Gurtovoy 2000-2004
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_/nttp_decl.hpp>
18 #include <boost/mpl/aux_/config/arrays.hpp>
19 #include <boost/mpl/aux_/config/msvc.hpp>
20 #include <boost/mpl/aux_/config/workaround.hpp>
21 
22 
23 namespace boost { namespace mpl { namespace aux {
24 
25 typedef char (&no_tag)[1];
26 typedef char (&yes_tag)[2];
27 
28 template< bool C_ > struct yes_no_tag
29 {
30     typedef no_tag type;
31 };
32 
33 template<> struct yes_no_tag<true>
34 {
35     typedef yes_tag type;
36 };
37 
38 
39 template< BOOST_MPL_AUX_NTTP_DECL(long, n) > struct weighted_tag
40 {
41 #if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
42     typedef char (&type)[n];
43 #else
44     char buf[n];
45     typedef weighted_tag type;
46 #endif
47 };
48 
49 #if defined(BOOST_MPL_CFG_NO_DEPENDENT_ARRAY_TYPES)
50 template<> struct weighted_tag<0>
51 {
52     typedef char (&type)[1];
53 };
54 #endif
55 
56 }}}
57 
58 #endif // BOOST_MPL_AUX_YES_NO_HPP_INCLUDED
59