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MakeMethods::Emulator::Singleton(3) User Contributed Perl Documentation MakeMethods::Emulator::Singleton(3)

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

  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();

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'".
Caution: This affects all subsequent uses of Class::Singleton in your program, including those in other modules, and might cause unexpected effects.

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 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.
2004-09-06 perl v5.28.1

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