对象死亡的时候会调用析构函数 

#include<iostream>
using namespace std;

class MM
{
public:
	
	~MM()
	{
		cout << "调用析构函数" << endl << endl;
	}

};

int main()
{
	{
		
		MM mm;
		//动态申请的内存需要手动释放
		MM* p = new MM();

		cout << "1........" << endl;
		delete p;
		cout << "2........" << endl;
		p = nullptr;
	}

	cout << "对象死亡" << endl;
	return 0;
}