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    <p>In the current (OS X 10.5/GCC 4.0.1) compiler, you cannot directly access the runtime-synthesized ivars. Greg Parker, one of the OS X runtime engineers put it <a href="http://www.mail-archive.com/cocoa-dev@lists.apple.com/msg31266.html" rel="nofollow noreferrer">this</a> way on the cocoa-dev list (March 12, 2009):</p> <blockquote> <p>You can't in the current compiler. A future compiler should fix that. Use explicit @private ivars in the meantime. An @private ivar should not be considered part of the contract - that's what @private means, enforced by compiler warnings and linker errors.</p> <p>And why isn't there a way to explicitly declare instance variables in the .m file for the new runtime?</p> <p>Three reasons: (1) there are some non-trivial design details to work out, (2) compiler-engineer-hours are limited, and (3) @private ivars are generally good enough.</p> </blockquote> <p>So, for now you must use dot-notation to access properties, even in <code>init</code> and <code>dealloc</code>. This goes against the best practice of using ivars directly in these cases, but there's no way around it. I find that the ease of using runtime-synthesized ivars (and the performance benefits) outweigh this in most cases. Where you do need to access the ivar directly, you can use a @private ivar as Greg Parker suggests (there's nothing that prevents you from mixing explicitly declared and runtime-synthesized ivars).</p> <p><strong>Update</strong> With OS X 10.6, the 64-bit runtime does allow direct access to the synthesized ivars via <code>self-&gt;ivar</code>. </p>
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    1. POUsing instance variables with Modern Runtime
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    1. USBarry Wark
    1. USBarry Wark
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    1. COThanks Barry, this is what I thought and was hoping to confirm. As I mention in a comment below, I'm going to give this a test before really marking as answered.
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      1. USScott Little
    2. COOkay, I just confirmed that this actually works as described here. See edit above for results.
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    3. COIt appears that you can leave out the "self->" part and just use the ivar name directly as well. This doesn't seem to work for the iPhone runtime at present though.
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      1. USbriankc
 

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