学步园

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

输出结果：

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

输出结果：