Add helpers `success_if_valued()`

ned14 / outcome

Provides very lightweight outcome<T> and result<T> (non-Boost edition)

https://ned14.github.io/outcome

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Closed ned14 closed 3 years ago

ned14 commented 3 years ago

Add:

basic_result<void, E1> success_if_valued<E1 = E2>(value_or_error<T, E2>). E2 must be constructible to E1.

value_or_error<T, E> is the Outcome concept already in there.

Make sure these work for outcome::outcome<T> inputs as well.

ned14 commented 3 years ago

After investigation, this cannot be easily done currently without using macros, so closing.