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Postings from October 2015
Ricardo Signes wrote:
>On the other hand, a future &num could provide a faster magic value that ~~'s
>implementation can know to directly resolve to a numeric comparison. I'd doubt
>it would ever match custom when:num syntax in speed,
It totally could, without any real difficulty. XS code that knows
specifically about the objects returned by num() could hook checking of
the smartmatch op, recognise a num()-generated const value on the rhs,
and replace the smartmatch with a numeric comparison op. Also, num()
call expressions with const parameter expression can be constant-folded.
Putting them together, "when(num(3))" would compile to the same ops as
"when { $_ == 3 }".
-zefram
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