Re: What operator should perl5porters use for safe dereferencing? (Specification?)

I'm confused!

The poll is bout calling methods on undef instead of a blesses ref, the linked p5p discussions I read so far are about avoiding autovivication when dereferencing nested var-refs.

So which cases are covered?

Cheers Rolf

Comment on Re: What operator should perl5porters use for safe dereferencing? (Specification?)

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Re^2: What operator should perl5porters use for safe dereferencing? (Specification?) by ambrus (Abbot) on Jun 03, 2012 at 09:06 UTC
Both of those! `$r&->f` would behave something like `$r && $r->f` so it would call method `f` on the object `$r` if it's set, or do nothing and return undef if `$r` is undefined. `$h{$w}&->()` would look the word `$w` up in the hooks table `%h`, and if there's an entry, call it as a subref, but if there's no entry, it would just nop silently. Finally, `$t{$x}&->{$y}` would be like `$t{$x}{$y}` only it doesn't autovivify `$t{$x}` as a hashref if it doesn't exist.	[reply] [d/l] [select]

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Re^2: What operator should perl5porters use for safe dereferencing? (Specification?)
by ambrus (Abbot) on Jun 03, 2012 at 09:06 UTC

Both of those!

$r&->f would behave something like $r && $r->f so it would call method f on the object $r if it's set, or do nothing and return undef if $r is undefined.

$h{$w}&->() would look the word $w up in the hooks table %h, and if there's an entry, call it as a subref, but if there's no entry, it would just nop silently.

Finally, $t{$x}&->{$y} would be like $t{$x}{$y} only it doesn't autovivify $t{$x} as a hashref if it doesn't exist.

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