| 1 | // (C) Copyright John Maddock 2010. |
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| 2 | // Use, modification and distribution are subject to the Boost Software License, |
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| 3 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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| 4 | // http://www.boost.org/LICENSE_1_0.txt). |
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| 5 | // |
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| 6 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. |
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| 7 | |
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| 8 | |
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| 9 | #ifndef BOOST_TT_CONDITIONAL_HPP_INCLUDED |
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| 10 | #define BOOST_TT_CONDITIONAL_HPP_INCLUDED |
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| 11 | |
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| 12 | #include <boost/config.hpp> |
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| 13 | |
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| 14 | namespace boost { |
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| 15 | |
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| 16 | template <bool b, class T, class U> struct conditional { typedef T type; }; |
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| 17 | template <class T, class U> struct conditional<false, T, U> { typedef U type; }; |
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| 18 | |
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| 19 | #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES) |
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| 20 | |
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| 21 | template <bool b, class T, class U> using conditional_t = typename conditional<b, T, U>::type; |
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| 22 | |
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| 23 | #endif |
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| 24 | |
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| 25 | } // namespace boost |
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| 26 | |
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| 27 | |
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| 28 | #endif // BOOST_TT_CONDITIONAL_HPP_INCLUDED |
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| 29 | |
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