1// (C) Copyright John Maddock 2005.
2// Use, modification and distribution are subject to the
3// Boost Software License, Version 1.0. (See accompanying file
4// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
5
6#ifndef BOOST_TYPE_TRAITS_INTEGRAL_CONSTANT_HPP
7#define BOOST_TYPE_TRAITS_INTEGRAL_CONSTANT_HPP
8
9#include <boost/config.hpp>
10#include <boost/mpl/bool.hpp>
11#include <boost/mpl/integral_c.hpp>
12
13namespace boost{
14
15#if defined(BOOST_NO_DEPENDENT_TYPES_IN_TEMPLATE_VALUE_PARAMETERS) || defined(__BORLANDC__)
16template <class T, int val>
17#else
18template <class T, T val>
19#endif
20struct integral_constant : public mpl::integral_c<T, val>
21{
22 typedef integral_constant<T,val> type;
23};
24
25template<> struct integral_constant<bool,true> : public mpl::true_
26{
27 typedef integral_constant<bool,true> type;
28};
29template<> struct integral_constant<bool,false> : public mpl::false_
30{
31 typedef integral_constant<bool,false> type;
32};
33
34typedef integral_constant<bool,true> true_type;
35typedef integral_constant<bool,false> false_type;
36
37}
38
39#endif
40