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Slide 1: Hierarchy of Inheritance http://ecomputernotes.com
Slide 2: Hierarchy of Inheritance • We represent the classes involved in inheritance relation in tree like hierarchy http://ecomputernotes.com
Slide 3: Example GrandParent Parent1 Parent2 Child1 Child2 http://ecomputernotes.com
Slide 4: Direct Base Class • A direct base class is explicitly listed in a derived class's header with a colon (:) class Child1:public Parent1 http://ecomputernotes.com
Slide 5: Indirect Base Class • An indirect base class is not explicitly listed in a derived class's header with a colon (:) • It is inherited from two or more levels up the hierarchy of inheritance class GrandParent{}; class Parent1: public GrandParent {}; class Child1:public Parent1{}; http://ecomputernotes.com
Slide 6: Base Initialization • The child can only perform the initialization of direct base class through base class initialization list • The child can not perform the initialization of an indirect base class through base class initialization list http://ecomputernotes.com
Slide 7: Example class GrandParent{ int gpData; public: GrandParent() : gpData(0){...} GrandParent(int i) : gpData(i){...} void Print() const; };
Slide 8: Example class Parent1: public GrandParent{ int pData; public: Parent1() : GrandParent(), pData(0) {…} }; http://ecomputernotes.com
Slide 9: Example class Child1 : public Parent1 { public: Child1() : Parent1() {...} Child1(int i) : GrandParent (i) //Error {...} void Print() const; };
Slide 10: Overriding • Child class can override the function of GrandParent class http://ecomputernotes.com
Slide 11: Example GrandParent Print() Parent1 Child1 Print() http://ecomputernotes.com
Slide 12: Example void GrandParent::Print() { cout << “GrandParent::Print” << endl; } void Child1::Print() { cout << “Child1::Print” << endl; } http://ecomputernotes.com
Slide 13: Example int main(){ Child1 obj; obj.Print(); obj.Parent1::Print(); obj.GrandParent::Print(); return 0; } http://ecomputernotes.com
Slide 14: Output • Output is as follows Child1::Print GrandParent::Print GrandParent::Print http://ecomputernotes.com
Slide 15: Types of Inheritance • There are three types of inheritance -Public -Protected -Private • Use keyword public, private or protected to specify the type of inheritance http://ecomputernotes.com
Slide 16: Public Inheritance class Child: public Parent {…}; Member access in Base Class Public Protected Private Derived Class Public Protected Hidden
Slide 17: Protected Inheritance class Child: protected Parent {…}; Member access in Base Class Public Protected Private Derived Class Protected Protected Hidden
Slide 18: Private Inheritance class Child: private Parent {…}; Member access in Base Class Public Protected Private Derived Class Private Private Hidden
Slide 19: Private Inheritance • If the user does not specifies the type of inheritance then the default type is private inheritance class Child: private Parent {…} is equivalent to class Child: Parent {…} http://ecomputernotes.com
Slide 20: Private Inheritance • We use private inheritance when we want to reuse code of some class • Private Inheritance is used to model “Implemented in terms of” relationship http://ecomputernotes.com
Slide 21: Example class Collection { public: void AddElement(int); bool SearchElement(int); bool SearchElementAgain(int); bool DeleteElement(int); }; http://ecomputernotes.com
Slide 22: Example • If element is not found in the Collection the function SearchElement will return false • SearchElementAgain finds the second instance of element in the collection http://ecomputernotes.com
Slide 23: Class Set class Set: private Collection { private: public: void AddMember(int); bool IsMember(int); bool DeleteMember(int); }; http://ecomputernotes.com
Slide 24: Class Set void Set::AddMember(int i){ if (! IsMember(i) ) AddElement(i); } bool Set::IsMember(int i){ return SearchElement(i); } http://ecomputernotes.com