Summary
This homework assignment focuses on inheritance and polymorphism
Skills Expected
All previous skills up to now
Abstract classes
Inheritance/Polymorphism
Friend keyword
Assignment Description
Design and create an abstract “Parent” class, two non-abstract “Child” classes (each inherits from the Parent), and one non-abstract “Grandchild” class. In other words, attempt the “Hybrid” (or “Diamond”) inheritance scheme1.
For example, you could have a “Creature” abstract class that are inherited by “Robot” and “Bear” classes and subsequently a “RoboBear2” class.
Grading Criteria
One abstract “Parent” object (e.g. “Creature”) o [1 Point] All instance variables private
o [1 Point] Getters/setters as appropriate (enforce invariants)
o [1 Point] At least one overloaded constructor (call setter to enforce invariants)
o [1 Point] At least one “pure virtual” function
o [1 Point] At least one virtual function that is implemented in “Parent”
Two separate non-abstract “Child” objects (e.g. “Robot” and “Bear”)
[1 Point] All instance variables private
[1 Point] Getters/setters as appropriate (enforce invariants)
[2 Point] Properly pass data to parent constructor(s)
[2 Point] Make one Child a “friend class” of the other Child and have a function that makes use of the friend class’ private instance variables
[2 Point] At least one Child must have at least one “friend function”
[1 Point] Proper use of override
One non-abstract “Grandchild” Object (e.g. “Robobear”)
[1 Point] All instance variables private
[1 Point] Getters/setters as appropriate (enforce invariants)
[2 Point] Properly pass data to parent constructor(s)
[2 Point] Override at least one function
[2 Point] Have at least one function that calls a specific parent’s function
Driver
[1 Point] Functional Positive Testing: Create an instance of each Child and Grandchild objects given valid values (passes invariant check)
[1 Point] Functional Negative Testing: Attempt to create an instance of each Child and Grandchild objects given invalid values (does not pass invariant check – what should it do?)
[6 Points] Driver should call each public method (including any public getter/setter)
