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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]
+