Hello folks, Here is a quick and straightforward pitch about @autoclosure. Currently the attribute indicates that the caller has to pass an expression so that the braces can be omitted. This is a convenient behavior only, but it also has it’s shortcomings.
I would like to propose an extension of that behavior. 1. Allow access to arguments and shorthand argument names: // Bug: https://bugs.swift.org/browse/SR-5296 func foo(_ test: @autoclosure (Int) -> Int = { $0 }) { print(test(42)) } // Convenient access using shorthand arguments foo(Int(Double($0) * 3.14))) 2. Make @autoclosure only wrap when necessary: func bar(_ test: @autoclosure () -> Int) { print(test()) } let test = { 42 } // function produces expected type 'Int'; did you mean to call it with '()'? bar(test) 3. Extend @autoclosure to closure types in general (this change is for consistent alignment): // Note how we're using the shorthand argument list for this expression let uppercaseWrapper: @autoclosure (String) -> String = $0.uppercased() -- Adrian Zubarev Sent with Airmail
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