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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