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```{index} single: parent (pragma)
```

# parent

Establish an ISA relationship with base classes at compile time

## SYNOPSIS

```perl
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

```perl
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:

```perl
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:

```perl
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:

```perl
package MyHash;
use Tie::Hash;
use parent -norequire, 'Tie::StdHash';
```

This is equivalent to the following code:

```perl
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:

```perl
package MySecondPlugin;
require './plugins/custom.plugin'; # contains Plugin::Custom
use parent -norequire, 'Plugin::Custom';
```

## HISTORY

This module was forked from [base](base.md) to remove the cruft
that had accumulated in it.

## CAVEATS

## SEE ALSO

- [base](base.md)
- [parent::versioned](https://metacpan.org/pod/parent::versioned)

    A fork of [parent](parent.md) that provides version checking in parent class modules.

## AUTHORS AND CONTRIBUTORS

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

## MAINTAINER

Max Maischein ` corion@cpan.org `

Copyright (c) 2007-2017 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.