comment on

Another problem I have encountered whilst creating my set of modules. Say I have my set of modules that are named as follows:

Module::Main
Module::Section1
Module::Section2

Now, let's say that I have the following code in index.pl:

#!/usr/bin/perl -w
use strict;

use Module::Main;
my $REQ = new Module::Main;
$REQ->init();
$REQ->start_it();
[download]

This is the start of it. Now, a couple of other modules are added to the mix...

Module::Main contains something like the following:

package Module::Main;

sub new {
  my $class = shift;
  my $self = {};
  bless ($self, $class);
  return $self;
}

sub init {
  my $self = shift;

  $self->{SEC1} = new Module::Section1;
  $self->{SEC2} = new Module::Section2;
  return 1;
}

sub start_it {
  my $self = shift;

  $self->{SEC1}->do_something();
  return 1;
}
[download]

And now, let's say that Module::Section1 contains something like this:

package Module::Section1;

sub new {
  my $class = shift;
  my $self = {};
  bless ($self, $class);
  return $self;
}

sub do_something {
  my $self = shift;

  =cut
    HERE! Now I need to access $REQ->{SEC2}->method();
    The problem? $self now contains the object specific
    to Module::Section1 (ie: $REQ->{SEC1}, not to $REQ.
    So I can't do $self->{SEC2}->method(). I could always
    change the my() declaration in index.pl to an our() and
    then use $::REQ->{SEC2}->method(), but this just
    defeats the purpose of using OO programming! Besides,
    this would require that the variable be named $REQ and
    not anything else. I could always pass a reference to
    $REQ to everything subroutine/method, but that just
    seems extremely messy and bad programming style.

    So how can I accomplish this?
  =cut

}
[download]

In reply to Accessing Methods of Another Package by mt2k

Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
Want more info? How to link or How to display code and escape characters are good places to start.


There's more than one way to do things
	PerlMonks