f1207.cpp

来自「it is a usefull thing」· C++ 代码 · 共 25 行

//=====================================
// f1207.cpp
// Virtual Function Misuse
//=====================================
#include <iostream>
using namespace std;
//-------------------------------------
class Base{
public:
  virtual void fn(int x){ cout<<"In Base class, int x = "<<x<<"\n"; }
};//-----------------------------------
class Sub : public Base{
public:
  virtual void fn(double x){ cout<<"In Sub class, double x = "<<x<<"\n"; }
};//-----------------------------------
void test(Base& b){
  b.fn(2);
  b.fn(3.5);
}//------------------------------------
int main(){
  test(Base());
  test(Sub());
}//====================================