C++单例

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template<typename T> class Singleton { public:     static T& GetInstance() {         static T instance;         return instance;     }       virtual ~Singleton() {     }       Singleton(const Singleton&) = delete;     Singleton& operator =(const Singleton&) = delete;   protected:     Singleton() {     } };

用法

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class Config : public Singleton<Config> {     friend class Singleton<Config>; public:     Config();     ~Config(); };