---
name: "Moose::Meta::TypeConstraint::Class"
section: "3pm"
platform: "linux"
package: "perl-moose"
version: "2.4001-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/Moose::Meta::TypeConstraint::Class"
---

# Moose::Meta::TypeConstraint::Class(3pm)

Class/TypeConstraint parallel hierarchy

## NAME

Moose::Meta::TypeConstraint::Class - Class/TypeConstraint parallel hierarchy

## VERSION

version 2.4001

## DESCRIPTION

This class represents type constraints for a class.

## INHERITANCE

`"Moose::Meta::TypeConstraint::Class"` is a subclass of Moose::Meta::TypeConstraint.

## METHODS

### Moose::Meta::TypeConstraint::Class-\>new(%options)

This creates a new class type constraint based on the given `%options`.

It takes the same options as its parent, with two exceptions. First, it requires an additional option, `"class"`, which is name of the constraint's class.  Second, it automatically sets the parent to the `"Object"` type.

The constructor also overrides the hand optimized type constraint with one it creates internally.

### $constraint-\>class

Returns the class name associated with the constraint.

### $constraint-\>parents

Returns all the type's parent types, corresponding to its parent classes.

### $constraint-\>is\_subtype\_of($type\_name\_or\_object)

If the given type is also a class type, then this checks that the type's class is a subclass of the other type's class.

Otherwise it falls back to the implementation in Moose::Meta::TypeConstraint.

### $constraint-\>create\_child\_type(%options)

This returns a new Moose::Meta::TypeConstraint object with the type as its parent.

Note that it does *not* return a `"Moose::Meta::TypeConstraint::Class"` object!

### $constraint-\>get\_message($value)

This is the same as "get\_message" in Moose::Meta::TypeConstraint except that it explicitly says `"isa"` was checked. This is to help users deal with accidentally autovivified type constraints.

## BUGS

See "BUGS" in Moose for details on reporting bugs.

## AUTHORS

- •

  Stevan Little \<stevan@cpan.org\>

- •

  Dave Rolsky \<autarch@urth.org\>

- •

  Jesse Luehrs \<doy@cpan.org\>

- •

  Shawn M Moore \<sartak@cpan.org\>

- •

  יובל קוג'מן (Yuval Kogman) \<nothingmuch@woobling.org\>

- •

  Karen Etheridge \<ether@cpan.org\>

- •

  Florian Ragwitz \<rafl@debian.org\>

- •

  Hans Dieter Pearcey \<hdp@cpan.org\>

- •

  Chris Prather \<chris@prather.org\>

- •

  Matt S Trout \<mstrout@cpan.org\>

## COPYRIGHT AND LICENSE

This software is copyright (c) 2006 by Infinity Interactive, Inc.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.