parent 0.225

parent is a Perl module that 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';

SYNOPSIS

 package Baz;
 use parent qw(Foo Bar);


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· Perl