[C++ 总结记录] 构造函数与析构函数调用时机

class Student {public:	Student();// 无参构造	Student(int age); //有参构造函数	Student(Student &stu);// 拷贝构造	~Student();	void show();private:	int m_age;};// 有参构造函数Student::Student(int age) {	this->m_age = age; 	cout << "有参构造" << endl;}// 无参构造函数Student::Student() {	this->m_age = 1000;	cout << "无参构造" << endl;}// 有参构造函数Student::Student(Student &stu) {	this->m_age = stu.m_age;	cout << "拷贝构造函数" << endl;}Student::~Student() {	cout << "析构函数" << endl;}void Student::show() {	cout <<this->m_age << endl;}

  Student stu;//调用无参构造函数  Student stu1(stu);//调用拷贝构造函数

void func1(Student p1) {    cout << "传值" << endl;}
Student stu1(10);func1(stu1);//这里发生个赋值操作，会调用拷贝构造函数

 Student func2(){ //以局部方式返回对象会发生拷贝构造     Student stu(20);//调用有参构造函数     return stu; }

class Dog {public:  Dog(string name){      this->name = name;  }  string name;}
// 调用Dog d1;//错误，没有与之对应的无参构造，用户定义了有参构造，系统不再提供无参构造Dog d1(10);//正确Dog(d1);//正确，系统默认提供拷贝构造函数