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Manual Reference Pages  -  CLASS::MAKEMETHODS::EMULATOR::SINGLETON (3)

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NAME

Class::MakeMethods::Emulator::Singleton - Emulate Class::Singleton

CONTENTS

SYNOPSIS



  use Class::MakeMethods::Emulator::Singleton;
 
  # returns a new instance
  my $one = Class::MakeMethods::Emulator::Singleton->instance();

  # returns same instance
  my $two = Class::MakeMethods::Emulator::Singleton->instance();



COMPATIBILITY

This module emulates the functionality of Class::Singleton, using Class::MakeMethods to generate similar methods.

You may use it directly, as shown in the SYNOPSIS above,

Furthermore, you may call use Class::MakeMethods::Emulator::Singleton -take_namespace; to alias the Class::Singleton namespace to this package, and subsequent calls to the original package will be transparently handled by this emulator. To remove the emulation aliasing, call use Class::MakeMethods::Emulator::Singleton -release_namespace.

<B>Caution:B> This affects <B>allB> subsequent uses of Class::Singleton in your program, including those in other modules, and might cause unexpected effects.

DESCRIPTION

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.

SEE ALSO

See Class::MakeMethods for general information about this distribution.

See Class::MakeMethods::Emulator for more about this family of subclasses.

See Class::Singleton for documentation of the original module.

For a description and discussion of the Singleton class, see Design Patterns, Gamma et al, Addison-Wesley, 1995, ISBN 0-201-63361-2.

See new in Class::MakeMethods::Hash and instance in Class::MakeMethods::ClassVar for documentation of the created methods.

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perl v5.20.3 MAKEMETHODS::EMULATOR::SINGLETON (3) 2004-09-06

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