Effective C++ .37 virtual函数中默认参数的表现

#include <iostream>
#include <cstdlib>

using namespace std;

class Pen {
public:
    virtual void write(int color = 0) {
        cout<<"write with color:"<<color<<endl;
    }
};

class Pencil : public Pen{
public:
    void write(int color = 128) {
        cout<<"write with color:"<<color<<endl;
    }
};

int main() {
    
    Pen* p = new Pencil();
    
    p->write();
    
    return 0;
}