[swift-evolution] Adding Result to the Standard Library

Dave DeLong swift at davedelong.com
Thu Nov 2 13:12:57 CDT 2017

I think I’d personally rather see this done with a generic error as well, like:

enum GenericResult<T, E: Error> {
	case success(T)
	case failure(E)

And a typealias:

typealias Result<T> = GenericResult<T, AnyError>

This would require an “AnyError” type to type-erase a specific Error, but I’ve come across many situations where a strongly-typed error is incredibly useful, and I’d be reluctant to see that thrown away.


> On Nov 2, 2017, at 12:08 PM, 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 <https://github.com/jshier/swift-evolution/blob/master/proposals/0187-add-result-to-the-standard-library.md>
> Thanks, 
> Jon Shier
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