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- [/
- Copyright 2010 John Maddock.
- Distributed under 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).
- ]
- [/===================================================================]
- [section:conditional conditional]
- [/===================================================================]
- __header ` #include <boost/type_traits/conditional.hpp>` or ` #include <boost/type_traits.hpp>`
- namespace boost {
- template <bool B, class T, class U> struct __conditional;
- template <bool B, class T, class U> using conditional_t = typename conditional<B, T, U>::type; // C++11 and above
- }
- If B is true, the member typedef type shall equal T. If B is false, the member typedef type shall equal U.
- [endsect]
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