Singleton Pattern
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This document discusses several creational design patterns in software engineering including the Singleton pattern. The Singleton pattern ensures that only one instance of a class is created while providing a global access point to that instance. It defines an Instance operation that allows clients to access its unique instance, which is a class operation. The instance is typically responsible for creating itself and clients access the Singleton instance solely through the Singleton's Instance operation, such as through a static Instance() method that returns the sole instance.
Singleton Pattern
- 2. Abstract Factory √ Builder √ Factory Method √ Prototype √ Singleton
- 8. • Defines an Instance operation that lets clients access its unique instance. Instance is a class operation. • May be responsible for creating its own unique instance. Clients access a Singleton instance solely through Singleton's Instance operation.
- 12. class Singleton { public: static Singleton* Instance(); protected: Singleton(); private: static Singleton* _instance; }; //The corresponding implementation is Singleton* Singleton::_instance = 0; Singleton* Singleton::Instance () { if (_instance == 0) { _instance = new Singleton; } return _instance; }