Inside Macintosh: Programmer's Guide to MacApp / Part 2 - Working With MacApp

Chapter 10 -
Working With Objects

This chapter provides recipes and sample code for performing basic operations with objects. The recipes demonstrate how to

• define a class by providing
  • a class definition
  • runtime type information
  • constructor and destructor methods
  • an initialization method

• create an instance of a class, initialize it, and delete the object when it is no longer needed
• use dynamic casting to convert between class types
• determine whether an object descends from a specified class

Before reading this chapter, you should read Chapter 2, "Basic Operations," which describes MacApp's basic object class, TObject, and MacApp's runtime type information (RTTI) mechanism.

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Chapter Contents

Overview

Choosing an Object Class

Creating Objects

Providing Runtime Type Information for a Class

Recipes--Objects

Recipe--Defining a Class

Provide a Class Definition

Provide Runtime Type Information in the Implementation

Provide Constructor and Destructor Methods

Provide an Initialization Method

Override Additional Methods

Recipe--Creating, Initializing, and Deleting an Object

Create and Initialize an Instance of a Class

Delete the Object When It Is No Longer Needed

Recipe--Dynamic Casting Between Class Types

Recipe--Determining Whether an Object Descends From a Specified Class