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
23namespace boost { namespace mpl { namespace aux {
24
25typedef char (&no_tag)[1];
26typedef char (&yes_tag)[2];
27
28template< bool C_ > struct yes_no_tag
29{
30 typedef no_tag type;
31};
32
33template<> struct yes_no_tag<true>
34{
35 typedef yes_tag type;
36};
37
38
39template< 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)
50template<> 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

source code of boost/boost/mpl/aux_/yes_no.hpp