Returns the value associated to the given key in a structure, or fail.Given a key and a Searchable structure, at_key returns the first value whose key is equal to the given key, and fails at compile-time if no such key exists. This requires the key to be compile-time Comparable, exactly like for find. at_key satisfies the following: 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)
