（十三）C++之智能指针的实现

参考：

1. 《STL源码剖析》
2. C++智能指针及其简单实现

1. autpptr简易实现

template<class T>
class AutoPtr
{
public:
    AutoPtr(T *p = nullptr) :pointer(p){}
    ~AutoPtr(){ delete pointer; }

    AutoPtr(AutoPtr<T> &rhs) : pointer(rhs.release()){
    }

    AutoPtr<T>& operator=(AutoPtr<T>& rhs){
        if (&rhs != this){
            reset(rhs.release());
        }
        return *this;
    }

    T* get(){ return pointer; }
    T& operator*()const{ return *pointer; }
    T* operator->()const{ return pointer; }
private:
    T* release(){
        T *result = pointer;
        pointer = nullptr;
        return result;
    }

    void reset(T *p){
        delete pointer;
        pointer = nullptr;
        pointer = p;
    }
private:
    T *pointer;
};

测试

int main()
{
    AutoPtr<int> ap(new int);
    *ap = 5;
    cout << *(ap.get()) << endl;

    AutoPtr<int> ap2(new int);
    *ap2 = 25;
    cout << *(ap2.get()) << endl;

    ap = ap2;
    cout << *(ap.get()) << endl;

    return 0;
}