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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" Class::MakeMethods::Emulator::Singleton \- Emulate Class::Singleton .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& 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(); .Ve .SH "COMPATIBILITY" .IX Header "COMPATIBILITY" This module emulates the functionality of Class::Singleton, using Class::MakeMethods to generate similar methods. .PP You may use it directly, as shown in the \s-1SYNOPSIS\s0 above, .PP Furthermore, you may call \f(CW\*(C`use Class::MakeMethods::Emulator::Singleton \*(Aq\-take_namespace\*(Aq;\*(C'\fR 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 \f(CW\*(C`use Class::MakeMethods::Emulator::Singleton \*(Aq\-release_namespace\*(Aq\*(C'\fR. .PP \&\fBCaution:\fR This affects \fBall\fR subsequent uses of Class::Singleton in your program, including those in other modules, and might cause unexpected effects. .SH "DESCRIPTION" .IX Header "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. .SH "SEE ALSO" .IX Header "SEE ALSO" See Class::MakeMethods for general information about this distribution. .PP See Class::MakeMethods::Emulator for more about this family of subclasses. .PP See Class::Singleton for documentation of the original module. .PP For a description and discussion of the Singleton class, see \&\*(L"Design Patterns\*(R", Gamma et al, Addison-Wesley, 1995, \s-1ISBN\s0 0\-201\-63361\-2. .PP See \*(L"new\*(R" in Class::MakeMethods::Hash and \*(L"instance\*(R" in Class::MakeMethods::ClassVar for documentation of the created methods.