[swift-evolution] [proposal] Either in the Swift Standard Library

[Dave Abrahams]

on Thu Jan 28 2016, Craig Cruden <swift-evolution at swift.org> wrote:

> So to summarize….
>
> Either is too specialized and thus not a good add…

I would say the opposite; what most people think of as Either is not
specialized enough, because it has no concrete semantics attached.

> And the general implementation that is not specialized - is likely too complicated to easily add.
>
> :o
>
>> On 2016-01-29, at 1:08:44, Chris Lattner via swift-evolution
>> <swift-evolution at swift.org> wrote:
>> 
>> 
>>> On Jan 27, 2016, at 10:09 PM, Thorsten Seitz via swift-evolution
>>> <swift-evolution at swift.org
>>> <mailto:swift-evolution at swift.org>>
>>> wrote:
>>> 
>>> As an alternative to Either for expressing a sum type I'd like to
>>> throw real union types like Ceylon uses into the discussion.
>>> 
>>> http://ceylon-lang.org/documentation/1.2/tour/types/ <http://ceylon-lang.org/documentation/1.2/tour/types/>
>> FWIW, this has been discussed before on swift-evolution.  Adding
>> them isn’t out of the question, but it is a lot more complicated
>> than it looks for the type checker.
>> 
>> -Chris
>> 
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-- 
-Dave