Warning when a function in a derived class fails to override a virtual function in a base class

Question

Consider the following little program:

#include <iostream>

class Base {
public:
    virtual void MyFunction() const {
        std::cout << "This is Base" << std::endl;
    }
};

class Derived : public Base {
public:
    virtual void MyFuntcion() {
        std::cout << "This is Derived" << std::endl;
    }
};

int main() {
    Base *p = new Derived();
    p->MyFunction();
    return 0;
}

it compiles cleanly with g++ -Wall -Wextra with nary a peep from the compiler, but when you run it, it prints "This is Base", due to the typo in the function name in Derived.

Now in java or C#, if you put an @override tag on the function, you'll get a warning from the compiler about the typo. Is there any way to do something similar with gcc? Perhaps a magic __attribute__ or some such?

http://en.cppreference.com/w/cpp/language/override – Pradhan Sep 03 '15 at 01:26 — Pradhan, Sep 03 '15 at 01:26

score 1 · Accepted Answer · answered Sep 03 '15 at 01:27

C++11 introduced override as well

class Derived : public Base {
public:
    void MyFuntcion() override {
        std::cout << "This is Derived" << std::endl;
    }
};

test.cpp:12:10: error: 'void Derived::MyFuntcion()' marked 'override', but does not override
     void MyFuntcion() override {

Warning when a function in a derived class fails to override a virtual function in a base class

1 Answers1