Niall Douglas wrote:
The idea, since we no longer have variant storage, is to see if we'd like to implement
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0262r0.html (except with the parameter order reversed).
I'm not particularly enthusiastic about status_value (and the argument given in the paper is unconvincing.) Neither am I thrilled by the idea of result<R, void> (an optional) or result<void, void> (something like a glorified pair<bool, bool>.) result<T, EC> in its original form represented a very clear concept: the type of a function that must either return a value, or a reason for the lack of value. All of the above do not fit this concept and to me ring hollow. The fact that for outcome<T, EC, exception_ptr> we may want to have both an EC and an exception_ptr does not necessarily mean that we need to give up on the Either( Value, Reason ). In outcome's case, the reason is just more elaborate.