Lecture 4 - Page 14 : 24

Notes about C++ Abstraction Mechanisms, Part 2 Inheritance in C++ Inheritance: Constructors and destructors Inheritance: Copying and slicing Member access control: private, public and protected Virtual Functions Destructors and Inheritance - Virtual Destructors Hiding inherited names Abstract Classes What about interfaces in C++? What about nested classes in C++? What about prevention of derivation in C++ Pointer to members Multiple inheritance - issues and C++ solutions Multiple inheritance - issues and C++ solutions Multiple inheritance: Ambiguities Replicated base class Is repeated inheritance possible? Is repeated inheritance possible? No! Shared base class: Virtual base Base class access Base class access Base class access - the C++ rules Base class access - Examples Discussion: No single most general class in C++

General problems The name clash problem: Does x in C refer to the x in A or the x in B? The programmer decides. Use the scope operator: A::x or B::x The selection problem: Do we have means in C to select either x in A or x in B? Yes - as already seen The combination problem: Can x in A and x in B be combined to a single x in C? No - but some control is possible via virtual bases The replication problem: Is there one or two x pieces in C? There are two x variables in a C object