The Haskell Unfolder Episode 10: generalBracket

(Will be streamed today, 2023-08-30, at 1830 UTC.)


Even for bare IO, I find generalBracket's ExitCode type useful. When you have to perform a different action in case of exception than in case of normal exit, it’s much more convenient to pattern match on the ExitCode than to do the mask / unmask / onException dance.

I’ve build a small helper on top of generalBracket called lazyGeneralBracket. The idea is not to perform the actual allocation until the resource is accessed for the first time. And if the resource is never accessed, no allocation will take place!

1 Like

I think you mean ExitCase

1 Like