C/C++自能指针 测试和手动实现

#include <iostream>
#include <memory>

using namespace std;
class  A
{
public:
    A(int a)
    {
        cout << "A()...." << endl;
        this->a = a;
    }
    void func()
    {
        cout << "a=" << this->a << endl;
    }
    ~A()
    {
        cout << "~A()...." << endl;
    }
private:
    int a;
};
//auto_ptr<A> ptr(new A(10));

class MyAutoPtr
{
public:
    MyAutoPtr(A* ptr)
    {
        this->ptr = ptr; //new A(10)
    }
    ~MyAutoPtr()
    {
        if (this->ptr != NULL)
        {
            delete ptr;
            this->ptr = NULL;
        }
    }
    A* operator->()
    {
        return this->ptr;
    }
    A& operator*()
    {
        return *(this->ptr);
    }
private:
    A* ptr;
};

void test01()
{
#if 0
    A * ap = new A(10);
    ap->func();
    (*ap).func();
    delete ap;
#endif
    auto_ptr<A> ptr(new A(10));
    ptr->func();
    (*ptr).func();
}
void test02()
{
    MyAutoPtr my_p(new A(10));

    my_p->func();     //my_p.ptr -> func()
    (*my_p).func();   //  *ptr.func()
}

int main()
{
    //test01();
    test02();
    cout << endl;
    cout << "结束" << endl;
    system("pause");
    return 0;
}