我想知道为什么以下功能出错:
#include<iostream>
using namespace std;
class Saba
{
public:
Saba(){ cout << "Saba Ctor" << endl; }
Saba(const Saba& a){ cout << "Saba Copy Ctor" << endl; }
~Saba(){ cout << "Saba Dtor" << endl; }
virtual void f(){ cout << "Saba f()" << endl; }
virtual void g(){ cout << "Saba g()" << endl; }
void h(){ cout << "Saba h()" << endl; }
};
class Aba : public Saba
{
public:
Aba(){ cout << "Aba Ctor" << endl; }
Aba(const Aba& a){ cout << "Aba Copy Ctor" << endl; }
~Aba(){ cout << "Aba Dtor" << endl; }
virtual void g(){ cout << "Aba g()" << endl; }
virtual void f(int){ cout << "Aba f(int)" << endl; }
virtual void h(){ cout << "Aba h()" << endl; }
};
class Son : public Aba
{
public:
Son(){ cout << "Son Ctor" << endl; }
Son(const Son& a){ cout << "Son Copy Ctor" << endl; }
~Son(){ cout << "Son Dtor" << endl; }
void f(){ cout << "Son f()" << endl; }
void h(){ cout << "Son h()" << endl; }
};
int main()
{
Saba* sabaPtr = new Son();
Aba* abaPtr =dynamic_cast<Aba*>(sabaPtr);
abaPtr->f();
abaPtr->g();
abaPtr->h();
delete sabaPtr;
return 0;
}
我收到一个错误“错误C2660:'Aba :: f':函数未采用0个参数”。但是“ aba”是从“ saba”继承的,因此他可以使用“ saba”的f()
最佳答案
带有1个参数的Aba::f
隐藏Saba::f
。这就是为什么当您不带任何参数调用Aba::f
时,编译器会抱怨的原因。仅供参考,叮当声给了我这些警告:
main.cpp:38:18:警告:“ Aba :: f”隐藏了重载的虚拟函数[-Woverloaded-virtual]
virtual void f(int){ cout << "Aba f(int)" << endl; }
^
main.cpp:38:18:注意:此处声明了隐藏的重载虚拟函数'Aba :: f':参数数量不同(1 vs 0)
virtual void f(int){ cout << "Aba f(int)" << endl; }