parent - Establish an ISA relationship with base classes at compile time
package Baz;use parent qw(Foo Bar);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 tellparent 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.pmThis 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 thatrequire 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::Customuse parent -norequire, 'Plugin::Custom';Attempting to inherit from yourself generates a warning.
package Foo;use parent 'Foo';This module was forked frombase to remove the cruft that had accumulated in it.
Rafaël Garcia-Suarez, Bart Lateur, Max Maischein, Anno Siegel, Michael Schwern
Max Maischein corion@cpan.org
Copyright (c) 2007-10 Max Maischein<corion@cpan.org> Based on the idea ofbase.pm, which was introduced with Perl 5.004_04.
This module is released under the same terms as Perl itself.
Perldoc Browser is maintained by Dan Book (DBOOK). Please contact him via theGitHub issue tracker oremail regarding any issues with the site itself, search, or rendering of documentation.
The Perl documentation is maintained by the Perl 5 Porters in the development of Perl. Please contact them via thePerl issue tracker, themailing list, orIRC to report any issues with the contents or format of the documentation.