[swift-evolution] Request to add middle dot (U+00B7) as operator character?

[Andrew Bennett]

I've definitely wanted to use some unavailable characters. I've also wanted
to add a postfix Greek question mark operator to my friend's code, but
that's a different issue.

On Friday, 18 December 2015, Chris Lattner via swift-evolution <
swift-evolution at swift.org> wrote:

>
> On Dec 17, 2015, at 2:35 PM, Radosław Pietruszewski via swift-evolution <
> swift-evolution at swift.org
> <javascript:_e(%7B%7D,'cvml','swift-evolution at swift.org');>> wrote:
>
> Although I would personally never, ever want to do this, I see no reason
> why this character shouldn’t be allowed for an operator.
>
> The question is: if we are to touch this are and extend the Unicode ranges
> of characters allowed for operators, what else is missing? A wider proposal
> to fill in the blanks would probably make sense.
>
>
> Right.  I also agree that adding this specific character makes sense, and
> it is trivial to extend the set of characters supported:
>
> https://github.com/apple/swift/blob/master/include/swift/AST/Identifier.h#L90
>
> The question is: what is the right set of characters?  It would be great
> for someone familiar with this space to dive in and try to rationalize it.
>
> -Chris
>
>
>
> — Radek
>
> On 17 Dec 2015, at 21:14, Ethan Tira-Thompson via swift-evolution <
> swift-evolution at swift.org
> <javascript:_e(%7B%7D,'cvml','swift-evolution at swift.org');>> wrote:
>
> Hi swift-evolution,
>
> I wanted to use ‘·’ as a dot-product operator, but it’s not currently
> defined as an operator character. (rdar://problem/23930008 suggested I
> come here for comment.)
>
> Note that dot operator (⋅, U+22C5) is already available for operators and
> semantically appropriate, but Mac users can conveniently type
> option-shift-9 to get the middle dot which is a nice feature and
> consequently it’s more well-known.  FWIW, we have U+00B6 (¶) already
> defined as an operator, this would extend its range by one.
>
> Thoughts?
>
> Thanks,
>  -Ethan
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