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Man Pages


Manual Reference Pages  -  PARENT (3)

.ds Aq ’

NAME

parent - Establish an ISA relationship with base classes at compile time

CONTENTS

SYNOPSIS



    package Baz;
    use parent qw(Foo Bar);



DESCRIPTION

Allows you to both load one or more modules, while setting up inheritance from those modules at the same time. Mostly similar in effect to



    package Baz;
    BEGIN {
        require Foo;
        require Bar;
        push @ISA, qw(Foo Bar);
    }



By default, every base class needs to live in a file of its own. If you want to have a subclass and its parent class in the same file, you can tell parent not to load any modules by using the -norequire switch:



  package Foo;
  sub exclaim { "I CAN HAS PERL" }

  package DoesNotLoadFooBar;
  use parent -norequire, Foo, Bar;
  # will not go looking for Foo.pm or Bar.pm



This is equivalent to the following code:



  package Foo;
  sub exclaim { "I CAN HAS PERL" }

  package DoesNotLoadFooBar;
  push @DoesNotLoadFooBar::ISA, Foo, Bar;



This is also helpful for the case where a package lives within a differently named file:



  package MyHash;
  use Tie::Hash;
  use parent -norequire, Tie::StdHash;



This is equivalent to the following code:



  package MyHash;
  require Tie::Hash;
  push @ISA, Tie::StdHash;



If you want to load a subclass from a file that require would not consider an eligible filename (that is, it does not end in either .pm or .pmc), use the following code:



  package MySecondPlugin;
  require ./plugins/custom.plugin; # contains Plugin::Custom
  use parent -norequire, Plugin::Custom;



HISTORY

This module was forked from base to remove the cruft that had accumulated in it.

CAVEATS

SEE ALSO

base

AUTHORS AND CONTRIBUTORS

Rafaeel Garcia-Suarez, Bart Lateur, Max Maischein, Anno Siegel, Michael Schwern

MAINTAINER

Max Maischein corion@cpan.org

Copyright (c) 2007-10 Max Maischein <corion@cpan.org> Based on the idea of base.pm, which was introduced with Perl 5.004_04.

LICENSE

This module is released under the same terms as Perl itself.
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