[boost] Why a concrete monad class? (was Re: [next gen futures] Lightweight monad ready for inspection)

Le 29/06/15 12:35, Niall Douglas a écrit : Niall, I don't see why do you need to define a concrete monad class that is used to define other monadic types. The implementation of each specific monadic type has its own trade-offs. We can provide monadic operations for optional/expected/future/.... Why do you need to have a concrete monad class? What is the added value? Best, Vicente