MakeMethods::Emulator:UsergContributed PerlMakeMethods::Emulator::Singleton(3)NAMEClass::MakeMethods::Emulator::Singleton - Emulate Class::Singleton
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'".
Caution: This affects all 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.
perl v5.14.22004-09-0MakeMethods::Emulator::Singleton(3)
