Install libclass-singleton-perl by entering the following commands in the terminal:
sudo apt update sudo apt install libclass-singleton-perl
Description:
implementation of a "Singleton" class
The Class::Singleton module implements a Singleton class from which other classes can be derived. 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. . 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. . For a description and discussion of the Singleton class, see "Design Patterns", Gamma et al, Addison-Wesley, 1995, ISBN 0-201-63361-2.
Homepage: https://metacpan.org/release/Class-Singleton
Version: 1.5-1
Section: universe/perl