31-C/C++ - 黑马课程笔记 - 《技术学习笔记》

深拷贝与浅拷贝
加号运算符重载
赋值运算符重载
函数提高
面向对象
- 三大特性
- 对象初始化和清理

深拷贝与浅拷贝

/*
    浅拷贝：简单的赋值操作
    深拷贝：在堆区重新申请空间，进行拷贝操作
*/
#include<iostream>
using namespace std;
class Person
{
public:
    Person() {
        cout << "无参构造函数" << endl;
    }
    Person(int age, int height) {
        cout << "有参构造函数" << endl;
        m_age = age;
        m_height = new int(height);
    }
    Person(const Person&p) {
        cout << "拷贝构造函数！" << endl;
        //如果不利用深拷贝在堆区创建新内存，会导致浅拷贝带来的重复释放堆区问题
        m_age = p.m_age;
        m_height = new int(*p.m_height); //深拷贝操作
    }
    ~Person() {
        cout << "析构函数" << endl;
        if (m_height != NULL)
        {
            delete m_height;
        }
    }
public:
    int m_age;
    int * m_height;
};
void test01()
{
    Person p1(18, 180);
    Person p2(p1);
    cout << "p1的年龄：" << p1.m_age << "身高：" << *p1.m_height << endl;
    cout << "p2的年龄：" << p2.m_age << "身高：" << *p2.m_height << endl;
}
int main() {
    test01();
    system("pause");
    return 0;
}