餓漢模式（執行緒安全）
class mycas
; mycas(const mycas &other) = delete;
mycas& operator=(const mycas &other) = delete;
private:
static mycas *m_instance;
public:
static mycas *getinstance()
class cdelete//用來釋放物件
}};};
mycas *mycas::m_instance = new mycas;
std::mutex resource_mutex;
class mycas
; mycas(const mycas &other) = delete;
mycas& operator=(const mycas &other) = delete;
private:
static mycas *m_instance;
public:
static mycas *getinstance()
}return m_instance;
} class cdelete//用來釋放物件
}}; void func() };
mycas *mycas::m_instance = nullptr;
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