singleton pattern
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design pattern in object-oriented software development
~6 min read
Encyclopedic overview
A class diagram exemplifying the singleton pattern.
In object-oriented programming, the singleton pattern is a software design pattern that restricts the instantiation of a class to a singular instance. It is one of the well-known "Gang of Four" design patterns, which describe 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.
Excerpted from Wikipedia’s “singleton pattern” article, available under the CC BY-SA 4.0 licence.