[swift-evolution] Proposal: Add generator functions to the language

Douglas Gregor dgregor at apple.com
Sat Dec 12 14:35:15 CST 2015

> On Dec 11, 2015, at 10:48 PM, Kevin Ballard via swift-evolution <swift-evolution at swift.org> wrote:
> I'd love to have first-class support for generators like this, but it's a lot of work. It's a lot easier to do this sort of thing in a scripting language like Python than it is to do in a language like Swift, because it requires reifying the stack into a data structure that can be passed around. And I suspect there's a lot of non-trivial questions that have to get answered before you can even propose an implementation for this.
> For context, this sort of thing is something that people have been talking about doing in Rust for quite a while, and it keeps getting punted because of the amount of work and the unanswered questions about how it would actually be implemented.
> So I'll give this a general +1, but I think it should also be deferred until after Swift 3 at the earliest.

Right. This is a major add-on feature that doesn’t fit in with the stated goals for Swift 3 (README of https://github.com/apple/swift-evolution <https://github.com/apple/swift-evolution>), so I think we should proactively defer it.

	- Doug

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