Ambiguity Resolution in Inheritance

We May face a problem using the multiple Inheritance , When a function name appear in more then one base class Class M { public : void display() { cout<< “Class M” } }; Class N { Public: Void Display() { cout <<“ Class N “} }; Which Display() function is used by the Derived class when we inherit these two class .

 The problem can be solved by defining a named Instance within the derived class resolution operator with the function. class P : public M , Public N { void Display() M :: display(); } }; Void main() { P p; P.display(); }

The Ambiguity may also Arise in a single Inheritance . Example Class A { Public : void Display() { cout<<“A”; }}; Class B : public A { cout<<“B”; }}; The Function in the Derived class overrides the inherited function So a simple call to display() function by B type object will invoke function defined in B Only But We may Invoke the function Display () defined in Class A by using the Scope Resolution operator to Specify the class

Int main() { B b ; b. display(); // invoke display() in B b Int main() { B b ; b.display(); // invoke display() in B b.A::display() // invoke display() in A b.B::display() // Invoke display() In B }

Nesting of classes Inheritance is the mechanism of deriving certain properties of one class into another . When a class contains objects of another class or its members, this kind of relationship is called containership or nesting . The class which contains objects of another class as its members is called as container class.

Class alpha {…… }; Class beta {……}; Class gamma { alpha a; // a is an object of alpha class beta b; // b is an object of beta class }; All the objects of gamma class will contain the object and b . This kind of relationship is called containership or nesting Creation of an object that contains another object is different then the creation of an independent object.

#include<iostream.h> class A                {            int a;                               public:                               void get();        }; class B                {            int b;                               A t;         // object t of class A is declare in class B                               void getdata();      }; void A :: get() {            cin>>a;                cout<<a; } void B :: getdata() {              cin>>b;                cout<<b;                t.get(); }                  //calling of get() of class A in getdata() of class B

void main() {              Clrscr();                B ab;                ab.getdata();                getch(); }