C++ virtual Function complie Error

Asked Dec 09 '15 at 04:43

Active Dec 09 '15 at 04:51

Viewed 31 times

#include <iostream>
using namespace std;

class A {
public:
 virtual void f4() { cerr << "A::f4()" << endl; }
}

class B : public A {
public:
 virtual void f4(int n) { cerr << "B::f4(" << n << ")" << endl; }
}

class C : public B {
public:
 virtual void f4(int n = 1) { cerr << "C::f4(" << n << ")" << endl; }
}

int main() {
    A a;
    B b;
    C c;

    A& rab = b;     
    A& rac = c;     
    B& rbc = c;     

    rab.f4(); rac.f4(); rbc.f4(); 
}

When i run try to compile this code using rab.f4(); rac.f4(); rbc.f4(); in the main method. rbc.f4() gives me a compiling error and it wont let me. can someone tell me the reason why?

edited Dec 09 '15 at 04:51

asked Dec 09 '15 at 04:43

Mebighobo

When posting questions about build errors, always include the actual (complete and unedited) errors in the question body. Please edit your question to include your build log. – Some programmer dude Dec 09 '15 at 04:45
Separate those into three different lines. That will help you clearly see which call is problematic. – R Sahu Dec 09 '15 at 04:46
Though one problem might be that you don't actually override the *same* function. Remember that function arguments are part of the unique function signature. – Some programmer dude Dec 09 '15 at 04:47
And trying to call `B::f4` without any arguments won't work very well either. – Some programmer dude Dec 09 '15 at 04:47

C++ virtual Function complie Error

0 Answers0