42ambiguityres.cpp

#include <iostream>
using namespace std;

class base1
{
public:
    void greet()
    {
        cout << "Good Morning, my greetings!" << endl;
    }
};
class base2
{
public:
    void greet() // Here we created a function with similar name as a previous base class
    {
        cout << "Good Evening, my greetings to you sir!" << endl;
    }
};
class derived : public base1, public base2
{
    // This derived class doesn't know whose greet function to fetch
    // To tell it we need to mention or address whose greet it needs to favour
public:
    void greet()
    {
        base1 ::greet();
    }
};
class derived_base1 : public base1
{
    /*
    IN CASE OF AMBIGUITY BETWEEN A BASE AND DERIVED CLASS :-

        The compiler favours the derived class function with same name as it has higher priority
        so no need for ambiguity resolution here
    */
public:
    void greet()
    {
        cout << "Good Afternoon, this is the favoured greeting !!" << endl;
    }
};
int main()
{
    base1 obj1;
    base2 obj2;
    derived obj3;
    obj1.greet();
    obj2.greet();
    obj3.greet();
    // This causes Ambiguity, where the derived class object can't determine whose greet function to call between base1 and base2

    /*
    TO RESOLVE AMBIGUITY :-

    1) CREATE A FUNCTION WITH SIMILAR NAME IN THE DERIVED CLASS
    2) USE THIS SYNTAX AS THE AMBIGUITY RESOLUTION
        {{base class}} :: {{function call/ name()}};
    */
    derived_base1 obj4;
    obj4.greet(); // this runs without any problem
    return 0;
}