Beefy Boxes and Bandwidth Generously Provided by pair Networks
good chemistry is complicated,
and a little bit messy -LW
 
PerlMonks  

having difficulty getting $self back from an _init() function

( #36523=categorized question: print w/ replies, xml ) Need Help??
Contributed by Anonymous Monk on Oct 13, 2000 at 02:07 UTC
Q&A  > object-oriented programming


Description:

I'm working on an object that is complex enough (using XML::Parser to initialize the object) that I broke the initialization into a separate function from the constructor. I've put the initialization function into a block with some package variables and private functions something like this:
sub new
{
  my $self = {};
  bless $self, shift;
  $self->_init();

  return $self;
}

{
  my(%registry,%regattrs)
  ...

  sub _parseStart
  sub _parseEnd
  ...

  sub _init()
  {
    $self = shift;

    parse file....

    $self = { 'modules' => { %registry },
              'site'    => $regattrs{site}
            };
  }

}
The problem is that upon returning from init back in the constructor, $self doesn't seem to be referring to anything anymore, even though i know it's been assigned properly (tested to see if the content was there before exiting _init - it was). Am i having scoping issues? This isn't the first time I've done something like this, but I had no difficulties last time. Thanks much, Stephen

Answer: having difficulty getting $self back from an _init() function
contributed by Fastolfe

In your init function, you are changing $self, creating a new hash reference. This destroys the associations it's had before. If you want to add some items to $self, set them individually:

sub _init { ... $self->{modules} = { %registry }; $self->{site} = $regattrs{site}; ... }
Answer: having difficulty getting $self back from an _init() function
contributed by Anonymous Monk

Thanks. It works fine now. -Stephen

Please (register and) log in if you wish to add an answer



  • 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
  • Outside of code tags, you may need to use entities for some characters:
            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 about the Monastery: (7)
    As of 2014-12-29 12:35 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      Is guessing a good strategy for surviving in the IT business?





      Results (187 votes), past polls