C override inherited methods

0 votes

The following are my two classes. Because Child inherits from Father, I believe Child::init() takes precedence over Father::init() (). Why do I receive "I'm the Father" instead of "I'm the Child" when I run the programme? What is the procedure for calling Child::init()?

#include <iostream>

using namespace std;

class Father {
    public:
        void start () {
            this->init();
        };

        void init () {
            cout << "I'm the father" << endl;
        };
};

class Child: public Father {
    void init () {
        cout << "I'm the child" << endl;
    };
};

int main (int argc, char** argv) {
    Child child;
    child.start();
}


Jun 15, 2022 in C++ by Nicholas
• 7,760 points
302 views

1 answer to this question.

0 votes

Child::init is now concealing Father::init and not overriding it. 

In order to receive dynamic dispatch, your init member function must be virtual:

virtual void init () {
    cout << "I'm the father" << endl;
};

Optionally, you could mark Child::init as override to be explicit that you want to override a virtual function (requires C++11):

void init () override {
    cout << "I'm the child" << endl;
};

answered Jun 20, 2022 by Damon
• 4,960 points

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