深拷贝与浅拷贝/初始化列表/类对象作为类成员

1、深拷贝与浅拷贝

#include<iostream>
using namespace std;


class Person
{
public:
	//构造函数
	Person()
	{
		cout << "Person的默认构造函数调用" << endl;
	}

	Person(int age, int height)
	{
		m_Age = age;
		m_Height = new int(height);
		cout << "Person的有参构造函数调用" << endl;
	}

	拷贝构造函数
	Person(const Person &p)
	{
		//将传入的人身上的所有属性，拷贝到我身上
		m_Age = p.m_Age;
		cout << "Person的拷贝构造函数调用" << endl;

		m_Height = new int(*p.m_Height);
	}

	~Person()
	{
		//析构代码，将堆区开辟数据做释放操作
		if (m_Height != NULL)
		{
			delete m_Height;
			m_Height = NULL;
		}
		cout << "Person的构析构函数调用" << endl;
	}

	int m_Age;//年龄
	int *m_Height;//身高


};

void test01()
{
	Person p1(18,160);
	cout << "p1的年龄为： " << p1.m_Age << "身高为： " <<*p1.m_Height<< endl;

	Person p2(p1);
	cout << "p2的年龄为： " << p2.m_Age << "身高为： " << *p2.m_Height << endl;

}



int main()
{
	test01();

	system("pause");
	return 0;
}

2、初始化列表

#include<iostream>
using namespace std;

//初始化列表

class Person
{
public:

	//传统初始化操作
	//Person(int a, int b, int c)
	//{
	//	m_A = a;
	//	m_B = b;
	//	m_C = c;
	//}

	//初始化列表初始化属性
	Person(int a, int b, int c) :m_A(a), m_B(b), m_C(c)
	{

	}

	int m_A;
	int m_B;
	int m_C;


};

void test01()
{
	Person p(1, 2, 3);

	//Person p;

	cout << "m_A=  " << p.m_A << endl;
	cout << "m_B=  " << p.m_B << endl;
	cout << "m_C=  " << p.m_C << endl;

}



int main()
{
	test01();

	system("pause");
	return 0;
}

3、类对象作为类成员

#include<iostream>
using namespace std;
#include<string>

//类对象作为类成员

//手机类
class Phone
{
public:

	Phone(string pName)
	{
		m_PName = pName;
		cout << "Phone的构造函数调用" << endl;
	}

	~Phone()
	{
		cout << "Phone的析构函数调用" << endl;
	}

	//手机品牌名称
	string m_PName;
};


//人类
class Person
{
public:

	Person(string name, string pName) :m_Name(name), m_Phone(pName)   //m_Phone = pName
	{
		cout << "Person的构造函数调用" << endl;
	}

	~Person()
	{
		cout << "Person的析构函数调用" << endl;
	}


	//姓名
	string m_Name;

	//手机
	Phone m_Phone;

};

//当其他类对象作为本类成员，构造时候先构造类对象，再构造自身
//析构函数时，自身对象先，类对象后释放
//析构和构造顺序相反

void test01()
{
	Person p("张三", "苹果Max");

	cout << p.m_Name << "拿着：" << p.m_Phone.m_PName << endl;

}



int main()
{
	test01();

	system("pause");
	return 0;
}