继承的时候，子类的拷贝构造函数和重载运算符的实现

#include <iostream>using namespace std;class Parent{public:Parent(){}Parent(int a):m_a(a){}Parent(const Parent& other):m_a(other.m_a){cout<<"Parent 拷贝构造函数"<<endl;}Parent& operator= (const Parent& other){cout<<"Parent 重载赋值运算符"<<endl;if(this == &other)return *this;m_a = other.m_a;return *this;}private:int m_a;};class Child : public Parent{public:Child(){}Child(int a, int b):Parent(a), m_b(b){}Child(const Child& other){m_b = other.m_b;cout<<"Child 拷贝构造函数"<<endl;}Child& operator= (const Child& other){cout<<"Child 重载赋值运算符"<<endl;if(this == &other)return *this;m_b = other.m_b;return *this;}private:int m_b;};int main(){Child child1(2, 3);Child child2(child1);Child child3 = child1;return 0;} 

输出结果：

 

 

#include <iostream>using namespace std;class Parent{public:Parent(){}Parent(int a):m_a(a){}Parent(const Parent& other):m_a(other.m_a){cout<<"Parent 拷贝构造函数"<<endl;}Parent& operator= (const Parent& other){cout<<"Parent 重载赋值运算符"<<endl;if(this == &other)return *this;m_a = other.m_a;return *this;}private:int m_a;};class Child : public Parent{public:Child(){}Child(int a, int b):Parent(a), m_b(b){}Child(const Child& other) : Parent(other) //调用父类的拷贝构造函数{ // Parent::Parent(other); //调用父类的拷贝构造函数(同上面的初始化列表)m_b = other.m_b;cout<<"Child 拷贝构造函数"<<endl;}Child& operator= (const Child& other){cout<<"Child 重载赋值运算符"<<endl;Parent::operator=(other); //调用父类的重载赋值运算符if(this == &other)return *this;m_b = other.m_b;return *this;}private:int m_b;};int main(){Child child1(2, 3);Child child2(child1);Child child3 = child1;return 0;} 

输出结果：