Singleton pattern
In software engineering, the singleton pattern is a software design pattern that restricts the instantiation of a class to a singular instance. One of the well-known "Gang of Four" design patterns, which describes how to solve recurring problems in object-oriented software, the pattern is useful when exactly one object is needed to coordinate actions across a system.
More specifically, the singleton pattern allows objects to:
- Ensure they only have one instance
- Provide easy access to that instance
- Control their instantiation (for example, hiding the constructors of a class)
The term comes from the mathematical concept of a singleton.
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