Closures are great. Very convenient for quickly defining a function to factor out some logic. Especially how they infer types.

Until I want to factor out some code when I'm starting a handful of threads. Then the twin facts that every closure is its own type, and that we apparently don't have generic closures yet rear their ugly heads.

If I want to pass closures as parameters to closures, are these my only options?

1. Upgrade the outer closure to a function, and have to explicitly write out all the trait bounds, which are potentially long and ugly (because apparently functions don't have type inference like closures)
2. Change the outer closure to a macro. (probably the easier of the two options, but feels like giving up)

5 posts - 3 participants

Read full topic