Karen Etheridge > Moose-2.1604 > Moose::Meta::TypeConstraint



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Moose::Meta::TypeConstraint - The Moose Type Constraint metaclass


version 2.1604


This class represents a single type constraint. Moose's built-in type constraints, as well as constraints you define, are all stored in a Moose::Meta::TypeConstraint::Registry object as objects of this class.


Moose::Meta::TypeConstraint is a subclass of Class::MOP::Object.



This creates a new type constraint based on the provided %options:


Returns true if the supplied name or type object is the same as the current type.


Returns true if the supplied name or type object is a parent of the current type.


Returns true if the given type is the same as the current type, or is a parent of the current type. This is a shortcut for checking equals and is_subtype_of.


This will attempt to coerce the value to the type. If the type does not have any defined coercions this will throw an error.

If no coercion can produce a value matching $constraint, the original value is returned.


This method behaves just like coerce, but if the result is not valid according to $constraint, an error is thrown.


Returns true if the given value passes the constraint for the type.


This is similar to check. However, if the type is valid then the method returns an explicit undef. If the type is not valid, we call $self->get_message($value) internally to generate an error message.


Like check and validate, this method checks whether $value is valid under the constraint. If it is, it will return true. If it is not, an exception will be thrown with the results of $self->get_message($value).


Returns the type's name, as provided to the constructor.


Returns the type's parent, as provided to the constructor, if any.


Returns true if the type has a parent type.


Returns all of the types parents as an list of type constraint objects.


Returns the type's constraint, as provided to the constructor.


This generates a method for the given value. If the type does not have an explicit message, we generate a default message.


Returns true if the type has a message.


Returns the type's message as a subroutine reference.


Returns the type's Moose::Meta::TypeCoercion object, if one exists.


Returns true if the type has a coercion.


Returns true if this type constraint can be inlined. A type constraint which subtypes an inlinable constraint and does not add an additional constraint "inherits" its parent type's inlining.


This returns a new type constraint of the same class using the provided %options. The parent option will be the current type.

This method exists so that subclasses of this class can override this behavior and change how child types are created.


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



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.

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