[swift-evolution] [Proposal] Custom operators

Maximilian Hünenberger m.huenenberger at me.com
Sun Apr 10 05:18:11 CDT 2016

> Am 10.04.2016 um 11:48 schrieb Антон Жилин <antonyzhilin at gmail.com>:
>> 2016-04-10 2:27 GMT+03:00 Maximilian Hünenberger <m.huenenberger at me.com>:
> [...]
>> The only minor syntax issue I have is that it is not immediately clear which operators belong to a precedence group. The former syntax with the "members(+, -)" solved this issue. However this has (currently) an extensibility problem:
>> If you define a new operator and it should belong to a precedencegroup where you have no access to its source (like Additive) then the whole argument about having operators in one place.
> My thoughts went as follows.
> We should be able to add operators to existing groups, for example, defined in the Standard Library.
> If so, then this this statement should belong to operator, not precedence group.
> But we have to declare the operator anyway, so adding `: Additive` or something to the declaration does not cause huge code bloat. Especially considering operators are not defined very often.
> Now, we have two ways to do the same thing. External declaration is necessary and not so bad. So, following a widely known principle, I remove `members`.
> [...]

My issue can be solved by the IDE: It could display all operators which are contained in a precedencegroup with quick look or the new interface view in Xcode. However this excludes other IDEs which don't have such features.

But as I said it is only a minor issue.

Best regards
- Maximilian

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