构造函数的使用
/*<span style="font-size:32px;color:#FF0000;">在写一个简单的多态例子的时候总是出错,后来发现是 在构造函数上面有问题 少写了new,结果依旧运行,那 么构造函数返回了什么呢</span>*/ #include "stdafx.h" #include<iostream> #include<string> using namespace std; class person { protected: string name; public: virtual void showinfo(); person(string name) :name(name) { cout << "this is person 构造函数" << endl; } person(person& rhs) { cout << "this is person拷贝构造函数" << endl; } }; void person::showinfo() { cout << name<<endl; } class teacher :public person{ protected: string prefession; public: void showinfo(); teacher(teacher& rhs):person(rhs) { cout << "this is teacher 拷贝构造函数" << endl; } teacher(string name, string prefession) :person(name), prefession(prefession) { cout << "this is teacher 构造函数" << endl; } }; void teacher::showinfo() { cout << name << " " << prefession << endl; } class student :public person { protected: int s_number; public: void showinfo(); student(string name, int nu) :person(name), s_number(nu) { cout << "this is student 构造函数"<<endl; } }; void student::showinfo() { cout << name << " " << s_number << endl; } int main() { person d = teacher("luyu", "jiaoshi");//构造函数这样写 d.showinfo(); person* b = new teacher("luyu", "jiaoshi");//或者这么写 b->showinfo(); delete b; return 0; }
运行结果是这样的,多调用了一个拷贝构造函数,那么构造函数返回的应该是this指针
对汇编无感,知乎上面的朋友给力
版权意识要浓厚
构造函数返回了一个this指针。。。。