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Has anyone implemented Futures in Objective-C? I (hopefully not naively) assume that it should be reasonably simple to wrap NSInvocations in a nice API?
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There are a lot of indicators telling us there's still a ton of legacy Objective-C code, both from Apple and from other developers, that's still in use.
Though mature and time-tested, Objective-C is now becoming obsolete and is often replaced by modern Swift. A relatively young open-source language, Swift was specifically developed by Apple for iOS and macOS.
While Objective-C is still supported by Apple and will likely not be deprecated anytime soon, there will be no updates to the language. Objective-C is as good as it's ever going to get.
If you want to get work done, Objective-C is the way to go. Swift is the new kid on the block, but it's still a kid. If you want to get work done, Objective-C is the way to go. At the time of writing, Apple's software development kits are primarily written in C and Objective-C.
Mike Ash has implemented Futures using Blocks:
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