拷贝构造

#include <iostream>
using namespace std;
class Monster
{
public:
    Monster();
    Monster(char * name,int hp,float speed);
    ~Monster();
    Monster(Monster &obj);
    Monster(Monster &obj1, int val);

public:
    string m_name;
    int m_hp;
    float m_speed;
};
Monster::Monster()
{
    m_name="name";
    m_hp=100;
    m_speed=10.0f;
    cout << "无参构造" << endl;
};
Monster::Monster(char * name,int hp,float speed)
{
    m_name=name;
    m_hp=hp;
    m_speed=speed;
    cout << "带参构造" << endl;
};
Monster::~Monster()
{
    cout << "析构函数" << endl;
}
// 拷贝构造
Monster::Monster(Monster &obj)
{
    m_name = obj.m_name;
    m_hp = obj.m_hp;
    m_speed = obj.m_speed;
    cout << "拷贝构造1" << endl;
};
Monster::Monster(Monster &obj, int val){
    m_name = obj.m_name;
    m_hp =val;
    m_speed = obj.m_speed;
    cout << "拷贝构造2" << endl;
};
void test_func_2(Monster monster){}

Monster test_func_1(){
    Monster l1;
    l1.m_hp=20;
    l1.m_speed=10.0f;
    return l1;
}
int main()
{
    
    Monster m0;
    m0=test_func_1();
    //test_func_2(m0);
    //Monster m1("皮卡丘", 10,1.0f);
    //test_func_1(m0);
    //Monster m3 = m0; //同类对象初始化
    //Monster m3(m0); // 使用一个对象构造另一个对象
    //  Monster *p = new Monster;
    //  delete p;
    //  p=nullptr;
}

　　拷贝构造函数调用：

　　1、使用一个已经创建完毕的对象来初始化一个新对象

       2、值传递的方式给函数参数传值

       3、 值方式返回局部对象