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Postings from December 2021
Paul "LeoNerd" Evans skribis 2021-11-29 16:08 (+0000):
>The final part of the "signatures" feature still to be implemented, is
>getting rid of the @_ setup
If I understand correctly, accessing @_ is currently commonly used to determine whether an optional argument was passed:
sub bar($self, $new = "blah") {
$self->{bar} = $new if @_ == 2;
$self->{bar};
}
...
$x->bar(undef); # set bar to undef
Or maybe I'm missing something.
Now, one could hack around that with a constant that is near impossible to accidentally pass as the argument...
use constant NONE => \do { my $x };
sub bar($self, $new = NONE) {
$self->{bar} = $new unless ref($new) and refaddr($new) == refaddr(NONE);
$self->{bar};
}
That would be ugly, but if that's what it takes to finally get signatures out of experimental status after 8 years, I'd take it. However, it seems to me that there should be a better, and officially supported, way to do this.
--
Met vriendelijke groet, // Kind regards, // Korajn salutojn,
Juerd Waalboer <juerd@tnx.nl>
TNX
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