Re: [boost] [outcome] How to drop the formal empty state

Let me just clarify the nomenclature here. I understand that the only thing you *need* to have is the *moved-form* state. There is no strong need to provide a default constructor. Sure if you have a moved-from state, you might as well use it in default constructor, but it is not the only option. You could allow the moved-from state only as the result of a move.

You don't need a moved-from state. If expected<T, E> is moved from and it had state T, it retains a state T, the value is whatever type T's move constructor left it in. No need to be complex when simple will do. Niall -- ned Productions Limited Consulting http://www.nedproductions.biz/ http://ie.linkedin.com/in/nialldouglas/