Return the number of elements in a foldable structure.Given a Foldablexs, length(xs) must return an object of an unsigned integral type, or an IntegralConstant holding such an object, which represents the number of elements in the structure. 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)
