深浅拷贝及其现代写法

#include<iostream>
using namespace std;
class Person
{
public:
	//默认构造
	Person()
	{
		cout << "Person()" << endl;
	}
	//有参构造函数
	Person(int age,int height)
	{
		m_age = age;
		m_height = new int(height);
		cout << "Person(int age, int height)" << endl;
	}
	Person(const Person& p)
	{
		cout << "Person(const Person& p)" << endl;
		m_age = p.m_age;
		//this->m_height = p.m_height;
		this->m_height = new int(*p.m_height);
	}
	~Person()
	{

		m_age = 0;
		if (m_height)
		{
			delete m_height;
			m_height = NULL;
		}
		delete m_height;
		cout << "~Person()" << endl;
	}

	int m_age;
	int* m_height;
};
int main()
{
	
	Person p1(20,180);
	Person p2 (p1);
	cout <<"age:" << p1.m_age << "      " << "height:"<< * p1.m_height << endl;
	cout <<"age:" << p2.m_age << "      " << "height:"<< *p2.m_height << endl;
	return 0;
}

同一块空间不能连续释放两次。 

现代写法则需要通过swap()来实现。

通过string来展示。