Re: Instance Variable access
Re: Instance Variable access
- Subject: Re: Instance Variable access
- From: "Louis C. Sacha" <email@hidden>
- Date: Fri, 7 May 2004 20:17:52 -0700
Hello...
If you want to understand what's going on with objc_msgSend and IMPs,
the necessary documentation is the Objective-C Reference, which can
be found at:
http://developer.apple.com/documentation/Cocoa/Conceptual/ObjectiveC/index.html
It is also included in the /Developer/Documentation/ installed with
the developer tools, but its location varies depending on which kind
of fur your system has (or I guess more accurately it depends on
which developer tools install you have used).
It would probably be a good idea to read through the whole thing, at
least once.
The details on objc_msgSend are in this section:
(The Objective-C Language > How Messaging Works)
http://developer.apple.com/documentation/Cocoa/Conceptual/ObjectiveC/3objc_language_overview/chapter_3_section_6.html
IMPs are function pointers that allow you to call methods directly
without using objective-C messaging. For more info on IMPs, you can
read the documentation for the Objective-C language, which are
discussed in that manual, but the description in the class
description for NSObject in the Foundation docs might be more helpful:
http://developer.apple.com/documentation/Cocoa/Reference/Foundation/ObjC_classic/Classes/NSObject.html
Hope that helps,
Louis
While this is an excellent answer, it does not answer the original
question - at least not for me. The response is about why it is good to
use ObjC_msgSend and makes an excellent point. However, the question is
about how to avoid ObjC_msgSend in favor of a more direct route in the
interest of speed. The answer to that question is also of interest to me
(some of us smoke test computers for a living).
Tim
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