In every Objective-C API I've seen that uses blocks, the framework takes care of the "[[... copy] autorelease]" bit. In practice, the code looks something like

In every Objective-C API I've seen that uses blocks, the framework takes care of the "[[... copy] autorelease]" bit. In practice, the code looks something like (to borrow your block with foos and bars): [array transformFoos:^(Foo*) (Foo* bar) { return bar; }]; I'm not sure there is a more succinct way to write a lambda with typed arguments and a typed return value.