[swift-evolution] Optional comparison operators

[Chris Lattner]

> On Jul 12, 2016, at 10:26 AM, Jacob Bandes-Storch <jtbandes at gmail.com> wrote:
> 
> I've submitted a PR for my proposal to remove these versions of </<=/>/>=  at  https://github.com/apple/swift-evolution/pull/425 <https://github.com/apple/swift-evolution/pull/425>.

Thanks, LGTM, I merged and kicked it off.

-Chris

> 
> On Tue, Jul 12, 2016 at 12:03 AM, Jacob Bandes-Storch <jtbandes at gmail.com <mailto:jtbandes at gmail.com>> wrote:
> On Mon, Jul 11, 2016 at 9:54 PM, Chris Lattner <clattner at apple.com <mailto:clattner at apple.com>> wrote:
> 
>> On Jul 11, 2016, at 9:35 PM, Mark Lacey <mark.lacey at apple.com <mailto:mark.lacey at apple.com>> wrote:
>> 
>> 
>>> On Jul 11, 2016, at 9:12 PM, Chris Lattner via swift-evolution <swift-evolution at swift.org <mailto: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.
> 
> I think it makes sense to keep removal of the non-equality comparisons a separate proposal.
> 
> Here's a draft. Feedback welcome:
> 
> https://github.com/jtbandes/swift-evolution/blob/master/proposals/0122-remove-optional-comparison-operators.md <https://github.com/jtbandes/swift-evolution/blob/master/proposals/0122-remove-optional-comparison-operators.md>
> 
> 

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