// (C) Copyright John Maddock 2015.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_TYPE_TRAITS_INTEGRAL_CONSTANT_HPP
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#define BOOST_TYPE_TRAITS_INTEGRAL_CONSTANT_HPP
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#include <boost/config.hpp>
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#include <boost/detail/workaround.hpp>
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#if (BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1400)) \
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|| BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x610)) \
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|| BOOST_WORKAROUND(__DMC__, BOOST_TESTED_AT(0x840)) \
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|| BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3202)) \
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|| BOOST_WORKAROUND(BOOST_INTEL_CXX_VERSION, BOOST_TESTED_AT(810)) )\
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|| defined(BOOST_MPL_CFG_NO_ADL_BARRIER_NAMESPACE)
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namespace boost{
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namespace mpl
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{
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template <bool B> struct bool_;
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template <class I, I val> struct integral_c;
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struct integral_c_tag;
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}
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}
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#else
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namespace mpl_{
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template <bool B> struct bool_;
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template <class I, I val> struct integral_c;
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struct integral_c_tag;
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}
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namespace boost
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{
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namespace mpl
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{
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using ::mpl_::bool_;
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using ::mpl_::integral_c;
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using ::mpl_::integral_c_tag;
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}
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}
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#endif
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namespace boost{
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template <class T, T val>
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struct integral_constant
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{
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typedef mpl::integral_c_tag tag;
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typedef T value_type;
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typedef integral_constant<T, val> type;
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static const T value = val;
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operator const mpl::integral_c<T, val>& ()const
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{
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static const char data[sizeof(long)] = { 0 };
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static const void* pdata = data;
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return *(reinterpret_cast<const mpl::integral_c<T, val>*>(pdata));
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}
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BOOST_CONSTEXPR operator T()const { return val; }
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};
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template <class T, T val>
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T const integral_constant<T, val>::value;
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template <bool val>
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struct integral_constant<bool, val>
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{
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typedef mpl::integral_c_tag tag;
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typedef bool value_type;
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typedef integral_constant<bool, val> type;
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static const bool value = val;
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operator const mpl::bool_<val>& ()const
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{
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static const char data[sizeof(long)] = { 0 };
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static const void* pdata = data;
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return *(reinterpret_cast<const mpl::bool_<val>*>(pdata));
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}
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BOOST_CONSTEXPR operator bool()const { return val; }
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};
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template <bool val>
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bool const integral_constant<bool, val>::value;
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typedef integral_constant<bool, true> true_type;
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typedef integral_constant<bool, false> false_type;
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}
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#endif
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