| template<class T> | |
| class enable_shared_from_this | |
| { | |
| protected: | |
| enable_shared_from_this() | |
| {} | |
| enable_shared_from_this(enable_shared_from_this const &) | |
| {} | |
| enable_shared_from_this & operator=(enable_shared_from_this const &) | |
| { | |
| return *this; | |
| } | |
| ~enable_shared_from_this() | |
| {} | |
| public: | |
| shared_ptr<T> shared_from_this() | |
| { | |
| return weak_this_.lock(); | |
| } | |
| weak_ptr<T> weak_from_this() | |
| { | |
| return weak_this_; | |
| } | |
| private: | |
| mutable weak_ptr<T> weak_this_; | |
}; 項目中使用： class A : public enable_shared_from_this<A> { public: A():mptr(new int) { cout << "A()" << endl; } ~A() { cout << "~A()" << endl; delete mptr; mptr = nullptr; } shared_ptr<A> getSharedPtr() { return shared_from_this(); } private: int *mptr; }; // Ptr: 普通共享指針// ConstPtr: 不可修改內容的共享指針// PtrConst: 不可修改指針的共享指針，內容可以修改// ConstPtrConst: 只能初始化的指針，不能做任何的修改動(dòng)作#define SHARED_PTR_DEFINE(X) public: typedef std::shared_ptrPtr; typedef std::shared_ptrConstPtr; typedef const std::shared_ptrPtrConst; typedef const std::shared_ptrConstPtrConst; class testA : public std::enable_shared_from_this{ SHARED_PTR_DEFINE(testA);}外部調用方法；testA::Ptr 表示智能指針 |
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