Boost Software License Version 1.0. See LICENSE_BOOST.txt for details. Alternatively, this file may be distributed under the terms of the Tango 3-Clause BSD License (see LICENSE_BSD.txt for details).
Copyright (c) 2016 dunnhumby Germany GmbH. All rights reserved.
Implementation of buffer which contains elements with indirections within them. Such elements can't be implicitly converted between const and mutable and thus API must be conservatively mutable.