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Objective-C 2.0 Runtime Programming Guide
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Objective-C 2.0 Runtime Programming Guide
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Objective-C 2.0 Runtime Programming Guide
Cocoa > Objective-C Language
2009-02-04
Apple Inc.
© 2009 Apple Inc.
All rights reserved.
No part of this publication may be reproduced,
stored in a retrieval system, or transmitted, in
any form or by any means, mechanical,
electronic, photocopying, recording, or
otherwise, without prior written permission of
Apple Inc., with the following exceptions: Any
person is hereby authorized to store
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documentation for personal use provided that
the documentation contains Apple’s copyright
notice.
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Use of the “keyboard” Apple logo
(Option-Shift-K) for commercial purposes
without the prior written consent of Apple may
constitute trademark infringement and unfair
competition in violation of federal and state
laws.
No licenses, express or implied, are granted
with respect to any of the technology described
in this document. Apple retains all intellectual
property rights associated with the technology
described in this document. This document is
intended to assist application developers to
develop applications only for Apple-labeled
computers.
Every effort has been made to ensure that the
information in this document is accurate. Apple
is not responsible for typographical errors.
Apple Inc.
1 Infinite Loop
Cupertino, CA 95014
408-996-1010
Apple, the Apple logo, Cocoa, Mac, Mac OS,
and Objective-C are trademarks of Apple Inc.,
registered in the United States and other
countries.
iPhone is a trademark of Apple Inc.
Simultaneously published in the United States
and Canada.
Even though Apple has reviewed this document,
APPLE MAKES NO WARRANTY OR REPRESENTATION,
EITHER EXPRESS OR IMPLIED, WITH RESPECT TO
THIS DOCUMENT, ITS QUALITY, ACCURACY,
MERCHANTABILITY, OR FITNESS FOR A PARTICULAR
PURPOSE. AS A RESULT, THIS DOCUMENT IS
PROVIDED “AS IS,” AND YOU, THE READER, ARE
ASSUMING THE ENTIRE RISK AS TO ITS QUALITY
AND ACCURACY.
IN NO EVENT WILL APPLE BE LIABLE FOR DIRECT,
INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES RESULTING FROM ANY
DEFECT OR INACCURACY IN THIS DOCUMENT, even
if advised of the possibility of such damages.
THE WARRANTY AND REMEDIES SET FORTH ABOVE
ARE EXCLUSIVE AND IN LIEU OF ALL OTHERS, ORAL
OR WRITTEN, EXPRESS OR IMPLIED. No Apple
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any modification, extension, or addition to this
warranty.
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of implied warranties or liability for incidental or
consequential damages, so the above limitation or
exclusion may not apply to you. This warranty gives
you specific legal rights, and you may also have
other rights which vary from state to state.
Contents
Introduction
Introduction 7
Organization of This Document 7
See Also 7
Chapter 1
Runtime Versions and Platforms 9
Legacy and Modern Versions 9
Platforms 9
Chapter 2
Interacting with the Runtime 11
Objective-C Source Code 11
NSObject Methods 11
Runtime Functions 12
Chapter 3
Messaging 13
The objc_msgSend Function 13
Using Hidden Arguments 15
Getting a Method Address 16
Chapter 4
Dynamic Method Resolution 17
Dynamic Method Resolution 17
Dynamic Loading 18
Chapter 5
Message Forwarding 19
Forwarding 19
Forwarding and Multiple Inheritance 20
Surrogate Objects 21
Forwarding and Inheritance 22
Chapter 6
Type Encodings 25
Chapter 7
Declared Properties 29
Property Type and Functions 29
Property Type String 30
Property Attribute Description Examples 30
3
2009-02-04 | © 2009 Apple Inc. All Rights Reserved.
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