Manpages - parent.3perl

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 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;

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

base

parent::versioned

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

Rafae\k:.l Garcia-Suarez, Bart Lateur, Max Maischein, Anno Siegel, Michael Schwern

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.

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