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This is the Class::Singleton module. A Singleton describes an object class that can have only one instance in any system. An example of a Singleton might be a print spooler or system registry. This module implements a Singleton class from which other classes can be derived. By itself, the Class::Singleton module does very little other than manage the instantiation of a single object. In deriving a class from Class::Singleton, your module will inherit the Singleton instantiation method and can implement whatever specific functionality is required.

This is a base class that is inherited by the Class::Measure classes. This distribution comes with the class Class::Measure::Length.

This perl module provides a clone() method which makes recursive copies of nested hash, array, scalar and reference types, including tied variables and objects.

The "mix_class" function provided by this module dynamically generates `anonymous' classes with specified inheritance.

This module is an alternative to Class::Singleton and Class::WeakSingleton, and provides a more secure Singleton class in that it takes steps to prevent the possibility of accidental creation of multiple instances and/or the overwriting of existing Singleton instances.

This distribution facilitates the run-time generation of classes which inherit from a base class and some optional selection of mixin classes. A factory is provided to generate the mixed classes with multiple inheritance. A NEXT method allows method redispatch up the inheritance chain.

The Class:Multimethod module exports a subroutine (&multimethod) that can be used to declare other subroutines that are dispatched using a algorithm different from the normal Perl subroutine or method dispatch mechanism. Normal Perl subroutines are dispatched by finding the appropriately-named subroutine in the current (or specified) package and calling that. Normal Perl methods are dispatched by attempting to find the appropriately-named subroutine in the package into which the invoking object is blessed or, failing that, recursively searching for it in the packages listed in the appropriate @ISA arrays. Class::Multimethods multimethods are dispatched quite differently. The dispatch mechanism looks at the classes or types of each argument to the multimethod (by calling ref on each) and determines the "closest" matching variant of the multimethod, according to the argument types specified in the variants' definitions (see "Finding the "nearest" multimethod" for a definition of "closest").

This module offers a minimalist class construction kit in around 120 lines of code.

Class::NamedParms Provides standard get/set/clear accessors for a class via named parameter with forced lexical checking of named parameters for validity and initialization validation. Lightweight and simple to use. Designed as a base class for inheritance by other modules.

Perl module which implements the Null Class design pattern