Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses

Re: Testing for definition of references

by jsprat (Curate)
on Jun 26, 2003 at 18:10 UTC ( #269342=note: print w/ replies, xml ) Need Help??

in reply to Testing for definition of references

Straight from the horse's mouth (perldoc -f defined):

Use of "defined" on aggregates (hashes and arrays) is deprecated. It used to report whether memory for that aggregate has ever been allocated. This behavior may disappear in future versions of Perl. You should instead use a simple test for size


Comment on Re: Testing for definition of references
Replies are listed 'Best First'.
Re: Re: Testing for definition of references
by DBX (Pilgrim) on Jun 26, 2003 at 18:18 UTC
    Yes, but if you follow what the perldoc says to do for regular arrays and hashes, but use it on a reference like:
    and it is not defined, Perl will crash. This is what I'm trying to avoid.
      I'm missing something here. You want to know if it is a reference, but you want to avoid using ref. Is there a reason why (besides not being a fan)? That's exactly what ref was designed to do.

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://269342]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others making s'mores by the fire in the courtyard of the Monastery: (8)
As of 2016-05-28 19:25 GMT
Find Nodes?
    Voting Booth?