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Full Discussion: Purpose of empty Class
Top Forums Programming Purpose of empty Class Post 302228560 by manosubsulo on Monday 25th of August 2008 03:55:58 AM
Old 08-25-2008
Check the below link for more detail...

http://www.cantrip.org/emptyopt.html
 

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Moose::Meta::TypeConstraint::Class(3)			User Contributed Perl Documentation		     Moose::Meta::TypeConstraint::Class(3)

NAME
Moose::Meta::TypeConstraint::Class - Class/TypeConstraint parallel hierarchy VERSION
version 2.0604 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. AUTHOR
Moose is maintained by the Moose Cabal, along with the help of many contributors. See "CABAL" in Moose and "CONTRIBUTORS" in Moose for details. COPYRIGHT AND LICENSE
This software is copyright (c) 2012 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. perl v5.16.2 2012-09-19 Moose::Meta::TypeConstraint::Class(3)
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