---
name: "parent"
section: "3pm"
platform: "linux"
package: "libparent-perl"
version: "0.223-1"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/parent/3pm"
---

# parent(3pm)

Establish an ISA relationship with base classes at compile time

## 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.

  ```
      use Foo;
      use parent 'Foo';
  ```

## HISTORY

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

## CAVEATS

## SEE ALSO

base

## AUTHORS AND CONTRIBUTORS

RafaA~Xl Garcia-Suarez, Bart Lateur, Max Maischein, Anno Siegel, Michael Schwern

## MAINTAINER

Max Maischein `" corion@cpan.org "`

Copyright (c) 2007 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.