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Effective C++ .33 子类的名称覆盖

#include <iostream>#include <cstdlib>using namespace std;class Base {    public:        int add(int a, int b) {            return a + b;        }};class Derived : public Base {    public:        using Base::add;        int add(int a, int b, int c) {            return a + b + c;        }};int main() {    Derived d;    cout<<d.add(1, 2)<<endl;    return 0;}

如果不在Derived中加入using命令,那么在main中就不能调用两个参数的add

Effective C++ .33 子类的名称覆盖