指针运算符重载，智能指针

#include<iostream>
using namespace std;
class person 
{
public:
	person() { cout << "无参构造的调用" << endl; }
	void show()
	{
		cout << "年龄为："<<18 << endl;
	  }
	~person()
	{
		cout << "析构函数的调用" << endl;
	}
};
void test()
{
	person* p=new person;
	p->show();
}
int main()
{
	test();
	system("pause");
	return 0;
}

#include<iostream>
using namespace std;
class person 
{
public:
	person() { cout << "无参构造的调用" << endl; }
	void show()
	{
		cout << "年龄为："<<18 << endl;
	  }
	~person()
	{
		cout << "析构函数的调用" << endl;
	}
};
//智能指针
class smartpoint 
{
public:
	smartpoint(person* person)
	{
		this->p = person;//指向在堆区开辟空间的地址
	}
	//重载->运算符号
	person* operator->()
	{
		return this->p;
	}
	//重载*运算符号
	person& operator*()
	{
		return *(this->p);
	}
	~smartpoint()
	{
		if (p != NULL)
		{
			delete p;
			p = NULL;
		}
	}
private:
	person* p;
};
void test()
{
	/*person* p=new person;
	p->show();*/
	/*delete p;*/

	//智能指针：托管new出来的对象的释放
	smartpoint sp(new person());
	//重载->运算符
	//这里sp->返回的是person*
	sp->show();//本质sp->->show(); 编译器简化为sp->show()        sp.operator->()返回值是*person
	
	(*sp).show();//*sp相当于-----sp.operator*(),返回值是(*person)
}
int main()
{
	test();
	system("pause");
	return 0;
}