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




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';


HISTORY

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


CAVEATS


SEE ALSO

       base(3)


AUTHORS AND CONTRIBUTORS

       Rafaeel 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.



perl v5.24.0                      2016-03-01                       parent(3pm)

perl 5.24 - Generated Fri Nov 18 19:23:58 CST 2016
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