[swift-evolution] Optional comparison operators

Jacob Bandes-Storch jtbandes at gmail.com
Tue Jul 12 12:26:26 CDT 2016


I've submitted a PR for my proposal to remove these versions of </<=/>/>=
 at  https://github.com/apple/swift-evolution/pull/425.

On Tue, Jul 12, 2016 at 12:03 AM, Jacob Bandes-Storch <jtbandes at gmail.com>
wrote:

> On Mon, Jul 11, 2016 at 9:54 PM, Chris Lattner <clattner at apple.com> wrote:
>
>>
>> On Jul 11, 2016, at 9:35 PM, Mark Lacey <mark.lacey at apple.com> wrote:
>>
>>
>> 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> wrote:
>>
>> You'd have to unwrap it, or use the ??/==/!= operators:
>> 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
>>
>> 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
>
>
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