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


more useful options
	PerlMonks

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

by LanX (Saint)

on Jun 02, 2012 at 13:50 UTC ( [id://974016]=note: print w/replies, xml )

Need Help??

in reply to What operator should perl5porters use for safe dereferencing?

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?)

Replies are listed 'Best First'.

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]

In Section Past Polls