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16 lines
737 B
Markdown
16 lines
737 B
Markdown
## Singleton
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Ensure a class only has one instance, and provide a global point of access to it.
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Pattern has creational purpose and deals with object relationships, which are more
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dynamic. The Singleton is often used as a part another design patterns (see [Façade]
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and [Flyweight]).
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### When to use
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* there must be exactly one instance of a class, and it must be accessible to clients from a well-known access point
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* when the sole instance should be extensible by subclassing, and clients should be able to use an extended instance without modifying their code
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[Façade]: https://github.com/JakubVojvoda/design-patterns-cpp/tree/master/facade
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[Flyweight]: https://github.com/JakubVojvoda/design-patterns-cpp/tree/master/flyweight
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