The MacApp Interim Manual Draft 4

, •® Macintosh® The MacApp® Interim Manual (:' Working Draft 4 (APDA) June 14, 1988 ©Apple Computer, Inc. 1988 S APPLE COMPUTER, INC. This manual and the software described in it are copyrighted, with all rights reserved. Under the copyright laws, this manual or the software may not be copied, in whole or in part, without written consent of Apple, except in the normal use of the software or to make a backup copy of the software. The same proprietary and copyright notices must be affixed to any permitted copies as were affixed to the original. This exception does not allow copies to be made for others, whether or not sold, but all of the material purchased (with all backup copies) may be sold, given, or loaned to another person. Under the law, copying includes translating into another language or format. You may use the software on any computer owned by you, but extra copies cannot be made for this purpose. ©Apple Computer, Inc., 1988 20525 Mariani Avenue Cupertino, CA 95014 (408) 996-1010 Apple, the Apple logo, LaserWriter, Lisa, MacApp, and Macintosh are registered trademarks of Apple Computer, Inc. APDA, MPW, MultiFinder, RESEDIT are trademarks of Apple Computer, Inc. ITC Avant Garde Gothic, ITC Garamond, and ITC Zapf Dingbats are registered trademarks of International Typeface Corporation. Microsoft is a registered trademark of Microsoft Corporation. POSTSCRIPT is a registered trademarlc of Adobe Systems Incorporated. Varityper is a registered trademark, and VT600 is a trademarlc, of AM International, Inc. Simultaneously published in the United States and Canada. 6/14/88 Table of Contents Preface About This Manual ix Prerequisites x Hardware x Software x What you should already know x1 What this manual contains xii How to use this manual xii Notation xiii Conventions in the MacApp code xiv Other books you should have xiv 0 Chapter 1 Why MacApp? 1 What is MacApp? 2 Programming without MacApp 3 Programming with MacApp 4 The division of labor 5 The benefits of MacApp 7 Chopter2 An Introduction to Object-Oriented Programming 9 The big picture 10 Record types and record variables 12 Object classes and object instances 13 Flow of control in object-oriented programs 18 Working Draft 4 (APDA) 6/14/88 MacApp 2.0 Tutorial Object classes 30 Inheritance 31 Method definitions 35 Override methods 36 Object instances 39 An instance method 40 Override methods 43 Override methods that don't call their inherited method 43 Override methods that do call their inherited method 44 Privacy between instances 47 Ramifications of object-oriented programming 47 Chapter3: Object Pascal 49 Object Pascal file organization 50 Object class definitions 55 Field declarations 56 Method declarations 56 Override method declarations 58 Object Instances 59 Record handles and record instantiations 59 Instantiation through record variables 59 Instantiation through record pointers 60 Instantiation through record handles 60 Object references and object insta…