47 C++ - 继承中的静态成员特性

class Base{
public:
  static int getNum(){ return sNum; }
  static int getNum(int param){
    return sNum + param;
  }
public:
  static int sNum;
};
int Base::sNum = 10;
class Derived : public Base{
public:
  static int sNum; //基类静态成员属性将被隐藏
#if 0
  //重定义一个函数，基类中重载的函数被隐藏
  static int getNum(int param1, int param2){
    return sNum + param1 + param2;
  }
#else
  //改变基类函数的某个特征，返回值或者参数个数，将会隐藏基类重载的函数
  static void getNum(int param1, int param2){
    cout <<  sNum + param1 + param2 << endl;
  }
#endif
};
int Derived::sNum = 20;