智能指针

#define _CRT_SECURE_NO_WARNINGS
//实现智能指针:
#include<iostream>
#include<string.h>
using namespace std;

class A
{
public:
	A()
	{
		cout << "A的无参构造" << endl;
	}
	~A()
	{
		cout << "A的析构函数" << endl;
	}
	void Print(void)
	{
		cout << "Print" << endl;
	}
};

//智能指针:
class SmartPointer
{
private:
	A* p;
public:
	SmartPointer() 
	{
		cout << "SmartPointer的无参构造" << endl;
	}                            
	SmartPointer(A* p)                                     
	{
		this->p = p;
		cout << "SmartPointer的有参构造" << endl;
	}
	~SmartPointer()                                        
	{
		if (p != NULL)    //p是对象,不能用delete[]释放
		{
			delete p;     //A类对象的释放,此前会调用p的析构函数
			p = NULL;
		}
		cout << "SmartPointer的析构函数" << endl;
	}
	//重载运算符:
	A* operator->()
	{
		return p;
	}
	A& operator*()
	{
		return *p;
	}
};

int main()
{
	SmartPointer pointer(new A);
	pointer->Print();
	(*pointer).Print();
	return 0;
}