parent(3p) Perl Programmers Reference Guide parent(3p)

parent(3p) Perl Programmers Reference Guide parent(3p) #

parent(3p) Perl Programmers Reference Guide parent(3p)

NNAAMMEE #

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

SSYYNNOOPPSSIISS #

     package Baz;
     use parent qw(Foo Bar);

DDEESSCCRRIIPPTTIIOONN #

 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';

HHIISSTTOORRYY #

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

CCAAVVEEAATTSS #

SSEEEE AALLSSOO #

 base
 parent::versioned
     A fork of parent that provides version checking in parent class
     modules.

AAUUTTHHOORRSS AANNDD CCOONNTTRRIIBBUUTTOORRSS #

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

MMAAIINNTTAAIINNEERR #

 Max Maischein " corion@cpan.org "

 Copyright (c) 2007-2017 Max Maischein "<corion@cpan.org>" Based on the
 idea of "base.pm", which was introduced with Perl 5.004_04.

LLIICCEENNSSEE #

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

perl v5.36.3 2021-03-02 parent(3p)