1parent(3)             User Contributed Perl Documentation            parent(3)
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NAME

6       parent - Establish an ISA relationship with base classes at compile
7       time
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SYNOPSIS

10           package Baz;
11           use parent qw(Foo Bar);
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DESCRIPTION

14       Allows you to both load one or more modules, while setting up
15       inheritance from those modules at the same time.  Mostly similar in
16       effect to
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18           package Baz;
19           BEGIN {
20               require Foo;
21               require Bar;
22               push @ISA, qw(Foo Bar);
23           }
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25       By default, every base class needs to live in a file of its own.  If
26       you want to have a subclass and its parent class in the same file, you
27       can tell "parent" not to load any modules by using the "-norequire"
28       switch:
29
30         package Foo;
31         sub exclaim { "I CAN HAS PERL" }
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33         package DoesNotLoadFooBar;
34         use parent -norequire, 'Foo', 'Bar';
35         # will not go looking for Foo.pm or Bar.pm
36
37       This is equivalent to the following code:
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39         package Foo;
40         sub exclaim { "I CAN HAS PERL" }
41
42         package DoesNotLoadFooBar;
43         push @DoesNotLoadFooBar::ISA, 'Foo', 'Bar';
44
45       This is also helpful for the case where a package lives within a
46       differently named file:
47
48         package MyHash;
49         use Tie::Hash;
50         use parent -norequire, 'Tie::StdHash';
51
52       This is equivalent to the following code:
53
54         package MyHash;
55         require Tie::Hash;
56         push @ISA, 'Tie::StdHash';
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58       If you want to load a subclass from a file that "require" would not
59       consider an eligible filename (that is, it does not end in either ".pm"
60       or ".pmc"), use the following code:
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62         package MySecondPlugin;
63         require './plugins/custom.plugin'; # contains Plugin::Custom
64         use parent -norequire, 'Plugin::Custom';
65

HISTORY

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

SEE ALSO

72       base
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AUTHORS AND CONTRIBUTORS

75       Rafaël Garcia-Suarez, Bart Lateur, Max Maischein, Anno Siegel, Michael
76       Schwern
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MAINTAINER

79       Max Maischein " corion@cpan.org "
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81       Copyright (c) 2007-2017 Max Maischein "<corion@cpan.org>" Based on the
82       idea of "base.pm", which was introduced with Perl 5.004_04.
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LICENSE

85       This module is released under the same terms as Perl itself.
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89perl v5.30.0                      2019-07-26                         parent(3)