| // (C) Copyright John Maddock 2010. |
| // Use, modification and distribution are subject to the Boost Software License, |
| // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt). |
| // |
| // See http://www.boost.org/libs/type_traits for most recent version including documentation. |
| |
| |
| #ifndef BOOST_TT_CONDITIONAL_HPP_INCLUDED |
| #define BOOST_TT_CONDITIONAL_HPP_INCLUDED |
| |
| #include <boost/config.hpp> |
| |
| namespace boost { |
| |
| template <bool b, class T, class U> struct conditional { typedef T type; }; |
| template <class T, class U> struct conditional<false, T, U> { typedef U type; }; |
| |
| #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES) |
| |
| template <bool b, class T, class U> using conditional_t = typename conditional<b, T, U>::type; |
| |
| #endif |
| |
| } // namespace boost |
| |
| |
| #endif // BOOST_TT_CONDITIONAL_HPP_INCLUDED |
