20. Derived Classes

Do not multiply objects without necessity.

– William Occam

• Introduction

• Derived Classes

Member Functions; Constructors and Destructors

• Class Hierarchies

Type Fields; Virtual Functions; Explicit Qualification; Override Control; using Base Members; Return Type Relaxation

• Abstract Classes

• Access Control

protected Members; Access to Base Classes; using-Declarations and Access Control

• Pointers to Members

Pointers to Function Members; Pointers to Data Members; Base and Derived Members

• Advice

20.1. Introduction

From Simula, C++ borrowed the ideas of classes and class hierarchies. In addition, it borrowed the design idea that classes should be used to model concepts in the programmer’s and the application’s world. C++ ...

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