name hiding in C++

name hiding in C++

#include <iostream>

#include <string>

#include <fstream>

#include <sstream>

#include <stdint.h>

#include <pthread.h>

#include <vector>

#include <map>

#include <set>

using namespace std;

void fun() {

    cout << __PRETTY_FUNCTION__ << endl;

}

namespace {

    void fun(int i) {

        cout << __PRETTY_FUNCTION__ << endl;

        ::fun(); //use fun() will compile error

    }

}

class A {

public:

    void fun() {

        cout << __PRETTY_FUNCTION__ << endl;

    }

    void fun(int x) {

        cout << __PRETTY_FUNCTION__ << endl;

    }

};

class B: public A {

public:

    //using A::fun; //solution 3

    void fun(int x) {

        cout << __PRETTY_FUNCTION__ << endl;

    }

};

int main(int argc, char* argv[]) {

    B b;

    //b.fun();//compile error, name hiding occurs

    b.A::fun(); //solution 1

    A* pa = &b;

    pa->fun();  //solution 2

    fun(3);

    return 0;

}

===================   run result   ===================

$ make name_hiding && ./name_hiding

void A::fun()

void A::fun()

void<unnamed>::fun(int)

void fun()