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@mikelty
Last active March 5, 2022 03:42
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// 有参构造函数!
// 拷贝构造函数!
// 拷贝构造函数!
// 无参构造函数!
// 析构函数!
// 析构函数!
// 析构函数!
// 析构函数!
#include<iostream>
using namespace std;
class Person {
public:
Person() {
cout << "无参构造函数!" << endl;
mAge = 0;
}
Person(int age) {
cout << "有参构造函数!" << endl;
mAge = age;
}
Person(const Person& p) {
cout << "拷贝构造函数!" << endl;
mAge = p.mAge;
}
//析构函数在释放内存之前调用
~Person() {
cout << "析构函数!" << endl;
}
public:
int mAge;
};
//1. 使用一个已经创建完毕的对象来初始化一个新对象
void test01() {
Person man(100); //p对象已经创建完毕
Person newman(man); //调用拷贝构造函数
Person newman2 = man; //拷贝构造
Person newman3;
newman3 = man; //不是调用拷贝构造函数,赋值操作
}
//2. 值传递的方式给函数参数传值
//相当于Person p1 = p;
void doWork(Person p1) {}
void test02() {
Person p; //无参构造函数
doWork(p);
}
//3. 以值方式返回局部对象
Person doWork2()
{
Person p1;
cout << (int *)&p1 << endl;
return p1;
}
void test03()
{
Person p = doWork2();
cout << (int *)&p << endl;
}
int main() {
test01();
// test02();
// test03();
system("pause");
return 0;
}
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