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멀티스레드 개발에서 일관성을 보장해주는 방식

  • 생성자 막기
  • 소멸자 막기
  • getter
  • multithread

// C++ Foo* Foo::Instance() { if(pinstance == nullptr) { lock_guard lock(m_); if(pinstance == nullptr) { pinstance = new Foo(); } } return pinstance; } </source>

// JAVA public static synchronized singleton getInstance () { if (instance == null) instance = new ThreadSafeInitalization(); return instance; } </source>

접기 1. 주소 값을 이용한 방식 class yh_singleton { public: static yh_singleton& getInstanse(){ static yh_singleton instance; return instance; }; int num; private: yh_singleton(){}; yh_singleton(const yh_singleton& other); yh_singleton& operator=(yh_singleton& cls); ~yh_singleton(){}; }; yh_singleton& yh= yh_singleton::getInstanse(); yh.num= 4; </source> 2. 포인터를 이용한 방식 class yh_singleton { public: static yh_singleton* getInstanse(){ static yh_singleton instance; return &instance; }; int num; private: yh_singleton(){}; yh_singleton(const yh_singleton& other); yh_singleton& operator=(yh_singleton& cls); ~yh_singleton(){}; }; yh_singleton* yh= yh_singleton::getInstanse(); yh->;num= 4; </source> 3. 템플릿 싱글톤 template <typename T> class yh_singleton { public: static T* getInstance() { if (instance == NULL) instance = new T; return instance; }; static void destroyInstance() { if (instance) { delete instance; instance = NULL; } }; private: static T* instance; protected: yh_singleton(const yh_singleton& other); yh_singleton& operator=(yh_singleton& cls); yh_singleton(); virtual ~yh_singleton(){}; }; template <typename T>T * yh_singleton<T>::instance = NULL; class ojectA : public yh_singleton<ojectA> { public: ojectA(); ~ojectA(); int a; }; </source>