20_类与对象_对象特征_05.cpp

#include <iostream>
using namespace std;

// 深拷贝与浅拷贝
// 浅拷贝：简单的赋值拷贝操作
// 深拷贝：在堆区重新申请空间，进行拷贝操作

class Person
{
public:
    int m_Age;
    int *m_Height;

    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;
    }

    // 自己实现拷贝构造函数，解决浅拷贝带来的问题
    Person(const Person &p)
    {
        cout << "Person拷贝构造函数调用" << endl;
        m_Age = p.m_Age;
        // m_Height = p.m_Height; // 编译器默认实现
        // 深拷贝操作
        m_Height = new int(*p.m_Height);
    }

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

void test01()
{
    Person p1(18, 170);
    cout << "p1年龄为 " << p1.m_Age << " 身高为 " << *p1.m_Height << endl;
    Person p2(p1);
    cout << "p2年龄为 " << p2.m_Age << " 身高为 " << *p2.m_Height << endl;
}

int main()
{
    test01();
    return 0;
}