- NAME
- SYNOPSIS
- DESCRIPTION
- DIAGNOSTICS
- HISTORY
- CAVEATS
- SEE ALSO
- AUTHORS AND CONTRIBUTORS
- MAINTAINER
- LICENSE
NAME
parent - Establish an ISA relationship with base classes at compile time
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';
DIAGNOSTICS
-
Class 'Foo' tried to inherit from itself
Attempting to inherit from yourself generates a warning.
package Foo; use parent 'Foo';
HISTORY
This module was forked from base to remove the cruft that had accumulated in it.
CAVEATS
SEE ALSO
AUTHORS AND CONTRIBUTORS
Rafa 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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