使用命名空间和类中原本有的函数同时出现时的调用次序

#include <iostream>
using namespace std;
class father
{
public: 
void F(void)
{cout<<"fathre"<<endl;
}
};
class derived :public father
{
public:
using father::F;


void F()
{
cout<<"derived"<<endl;}


};


void main()
{
derived D;
D.F();
}