Add an extra layer of comonadic context to a comonadic value.Given a value already in a comonadic context, duplicate wraps this value with an additional layer of comonadic context. This can be seen as the dual operation to flatten from the Monad concept. 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)
