# phpman > perldoc > Moose::Meta::TypeConstraint::Class

## NAME
    [Moose::Meta::TypeConstraint::Class](https://www.chedong.com/phpMan.php/perldoc/Moose%3A%3AMeta%3A%3ATypeConstraint%3A%3AClass/markdown) - Class/TypeConstraint parallel hierarchy

## VERSION
    version 2.2200

## DESCRIPTION
    This class represents type constraints for a class.

## INHERITANCE
    "[Moose::Meta::TypeConstraint::Class](https://www.chedong.com/phpMan.php/perldoc/Moose%3A%3AMeta%3A%3ATypeConstraint%3A%3AClass/markdown)" is a subclass of [Moose::Meta::TypeConstraint](https://www.chedong.com/phpMan.php/perldoc/Moose%3A%3AMeta%3A%3ATypeConstraint/markdown).

## METHODS
  [Moose::Meta::TypeConstraint::Class](https://www.chedong.com/phpMan.php/perldoc/Moose%3A%3AMeta%3A%3ATypeConstraint%3A%3AClass/markdown)->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](https://www.chedong.com/phpMan.php/perldoc/Moose%3A%3AMeta%3A%3ATypeConstraint/markdown).

  $constraint->create_child_type(%options)
    This returns a new [Moose::Meta::TypeConstraint](https://www.chedong.com/phpMan.php/perldoc/Moose%3A%3AMeta%3A%3ATypeConstraint/markdown) object with the type as its parent.

    Note that it does *not* return a "[Moose::Meta::TypeConstraint::Class](https://www.chedong.com/phpMan.php/perldoc/Moose%3A%3AMeta%3A%3ATypeConstraint%3A%3AClass/markdown)" object!

  $constraint->get_message($value)
    This is the same as "get_message" in [Moose::Meta::TypeConstraint](https://www.chedong.com/phpMan.php/perldoc/Moose%3A%3AMeta%3A%3ATypeConstraint/markdown) 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.