c++ 派生类 复制构造函数、赋值函数 小例子
class Base
{
public:
Base(int n):num(n){}
Base(const Base& rhs):num (rhs.num){}
Base& operator = (const Base& rhs)
{
if (this != &rhs)
{
num = rhs.num;
}
return *this;
}
virtual ~Base(){}
virtual void print() { cout<<num<<endl; }
void print(int i) { cout<<i<<endl;}
int getnum(){ return num;}
private:
int num;
};
class Dervied:public Base
{
public:
Dervied(int n,const string & str):Base(n),name(str){}
Dervied(const Dervied& rhs):Base(rhs),name(rhs.name){}
Dervied& operator =(const Dervied& rhs)
{
if (this != &rhs)
{
Base::operator =(rhs);
name = rhs.name;
}
return *this;
}
~Dervied(){}
void print(void) { cout<< name <<getnum() << endl;}
private:
string name;
};
void main( void )
{
Base item(5);
Dervied iDerv(2,"hi");
item.print();
iDerv.print();
cout<<"--------------------"<<endl;
Base* iter=new Dervied( 3,"hello");
iter->print(100);
}