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

[Chris Lattner]

> On Dec 17, 2015, at 2:35 PM, Radosław Pietruszewski via swift-evolution <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 <mailto: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 <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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