Conditionally return one of two values based on a condition.Specifically, then is returned iff cond is true-valued, and else_ is returned otherwise. Note that some Logical models may allow then and else_ to have different types, while others may require both values to have the same type. More...
Louis Dionne 2013-2016 Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
