[swift-evolution] Optional comparison operators

Mark Lacey mark.lacey at apple.com
Mon Jul 11 23:35:41 CDT 2016

> On Jul 11, 2016, at 9:12 PM, Chris Lattner via swift-evolution <swift-evolution at swift.org> wrote:
>> On Jul 11, 2016, at 8:14 PM, Jacob Bandes-Storch via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> You'd have to unwrap it, or use the ??/==/!= operators: https://gist.github.com/jtbandes/9d88cc83ceceb6c62f38 <https://gist.github.com/jtbandes/9d88cc83ceceb6c62f38>
>> I'd be okay with </<=/>/>= returning Bool?, as I suggested in an older email (which somehow didn't make it to gmane's archive, but it's quoted in some other messages <http://thread.gmane.org/gmane.comp.lang.swift.evolution/10095>). I think it would be more convenient in some cases than unwrapping the individual values before comparing them.
> I’d be strongly opposed to those operator returning “Bool?”.  Doing so would prevent conforming to Comparable and would be extremely surprising.
> -Chris

I just pushed the current draft of the proposal: https://github.com/rudkx/swift-evolution/blob/eliminate-value-to-optional-coercion/proposals/0000-disallow-value-to-optional-coercion-in-operator-arguments.md <https://github.com/rudkx/swift-evolution/blob/eliminate-value-to-optional-coercion/proposals/0000-disallow-value-to-optional-coercion-in-operator-arguments.md>

I haven’t addressed removal of the ordered comparison operators. I suspect this should be a separate proposal, but I can roll that into this one if it’s desired.

I’ll update the proposal as the discussion continues until it’s selected for review.


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