Singleton - 3axap-4/Patterns GitHub Wiki
Singleton pattern
The singleton pattern is a software design pattern that restricts the instantiation of a class to one. This is useful when exactly one object is needed to coordinate actions across the system. The term comes from the mathematical concept of a singleton. Critics consider the singleton to be an anti-pattern in that it is frequently used in scenarios where it is not beneficial, introduces unnecessary restrictions in situations where a sole instance of a class is not actually required, and introduces global state into an application.
Implementation details
