Returns whether a structure contains a subset of the keys of another structure.Given two Searchables xs and ys, is_subset returns a Logical representing whether xs is a subset of ys. In other words, it returns whether all the keys of xs are also present in ys. This method does not return whether xs is a strict subset of ys; if xs and ys are equal, all the keys of xs are also present in ys, and is_subset returns true. 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)
