Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
> Regarding the allocation, in this case, we're talking pointer to an array.

yes, reference to an array (pointers are in C memory addresses but references are more complicated).

But it doesn't matter @array and $array_ref=\@array are just two different ways to represent the same array.

> Normally, I wouldn't create an empty array, but was pretty sure that I had to have the reference in place before the push, yes?

As I told you: No!

You are pushing to a variable starting with @. If the array doesn't exist already it will be allocated. If it exists but it's incompatible to push (like a hash) you,'ll get an error.

DB<107> ref $a => "" DB<108> push @$a,1..3 => 3 DB<109> ref $a => "ARRAY" DB<110> $b={} => {} DB<111> push @$b,1..3 Not an ARRAY reference at (eval 44)[multi_perl5db.pl:644] line 2. DB<112> ref $b => "HASH"
In newer versions of Perl you are even allowed to push directly to $array_refs.

Cheers Rolf


In reply to Re^3: Avoiding memory loss... by LanX
in thread Avoiding memory loss... by J.Perl.Man

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others having an uproarious good time at the Monastery: (9)
    As of 2015-07-29 06:26 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (260 votes), past polls