[swift-evolution] Adding Result to the Standard Library

Rod Brown rodney.brown6 at icloud.com
Sun Nov 5 05:40:43 CST 2017

I was thinking the same thing. Typed throws vs `Error` throws are the two major differences between different Result implementations, and they seem somewhat tied from a discussion perspective.

I agree with others here, I would like to see this added to the library, and I think it’s a generally valuable type that has broad uses beyond the completion handler solution that it’s commonly been used for. But if we add things to do the standard library, they need to be consistent, with the direction of Swift, and that’s a big call at this stage to either write in or out typed throws...


> On 3 Nov 2017, at 2:41 pm, Chris Lattner via swift-evolution <swift-evolution at swift.org> wrote:
>> On Nov 2, 2017, at 11:08 AM, Jon Shier via swift-evolution <swift-evolution at swift.org> wrote:
>> Swift-Evolution:
>> 	I’ve written a first draft of a proposal to add Result<T> to the standard library by directly porting the Result<T> type used in Alamofire to the standard library. I’d be happy to implement it (type and tests for free!) if someone could point me to the right place to do so. I’m not including it directly in this email, since it includes the full implementation and is therefore quite long. (Discourse, please!) 
>> https://github.com/jshier/swift-evolution/blob/master/proposals/0187-add-result-to-the-standard-library.md
> I’m generally supportive of this, but the design of such a thing forces another contentious issue: whether the error handling model should be extended to support "typed throws”.  Without result, we can carry on pushing the "typed throws” debate down the road.  Adding it would force that issue to be decided, which is complicated.
> -Chris
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