[3408] | 1 | // (C) Copyright John Maddock 2005. |
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| 2 | // Use, modification and distribution are subject to the |
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| 3 | // Boost Software License, Version 1.0. (See accompanying file |
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| 4 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 5 | |
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| 6 | #ifndef BOOST_TYPE_TRAITS_INTEGRAL_CONSTANT_HPP |
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| 7 | #define BOOST_TYPE_TRAITS_INTEGRAL_CONSTANT_HPP |
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| 8 | |
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| 9 | #include <boost/config.hpp> |
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| 10 | #include <boost/mpl/bool.hpp> |
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| 11 | #include <boost/mpl/integral_c.hpp> |
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| 12 | |
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| 13 | namespace boost{ |
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| 14 | |
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| 15 | #if defined(BOOST_NO_DEPENDENT_TYPES_IN_TEMPLATE_VALUE_PARAMETERS) || defined(__BORLANDC__) |
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| 16 | template <class T, int val> |
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| 17 | #else |
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| 18 | template <class T, T val> |
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| 19 | #endif |
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| 20 | struct integral_constant : public mpl::integral_c<T, val> |
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| 21 | { |
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| 22 | typedef integral_constant<T,val> type; |
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| 23 | }; |
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| 24 | |
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| 25 | template<> struct integral_constant<bool,true> : public mpl::true_ |
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| 26 | { |
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| 27 | #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) |
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| 28 | # pragma warning(push) |
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| 29 | # pragma warning(disable:4097) |
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| 30 | typedef mpl::true_ base_; |
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| 31 | using base_::value; |
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| 32 | # pragma warning(pop) |
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| 33 | #endif |
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| 34 | typedef integral_constant<bool,true> type; |
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| 35 | }; |
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| 36 | template<> struct integral_constant<bool,false> : public mpl::false_ |
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| 37 | { |
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| 38 | #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) |
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| 39 | # pragma warning(push) |
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| 40 | # pragma warning(disable:4097) |
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| 41 | typedef mpl::false_ base_; |
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| 42 | using base_::value; |
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| 43 | # pragma warning(pop) |
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| 44 | #endif |
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| 45 | typedef integral_constant<bool,false> type; |
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| 46 | }; |
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| 47 | |
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| 48 | typedef integral_constant<bool,true> true_type; |
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| 49 | typedef integral_constant<bool,false> false_type; |
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| 50 | |
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| 51 | } |
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| 52 | |
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| 53 | #endif |
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