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Function's default values are corrupted (Nasty bug)
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Function's default values are corrupted (Nasty bug)


  • Subject: Function's default values are corrupted (Nasty bug)
  • From: Dave Thorup <email@hidden>
  • Date: Wed, 30 Mar 2005 15:49:23 -0500

I've got the following function whose default values are being corrupted when it is called:

IError * SetSize( unsigned long nWd, unsigned long nHt,
	long nEx1 = -1, long nEx2 = -1, long nEx3 = -1, long nEx4 = -1 );

When this is called like this:

//	nWd=4028, nHt=1324, nExtra=20
SetSize( nWd, nHt, nExtra );

Then the actual values that I see inside the function are as follows:

nWd=4028, nHt=1324, nEx1=20, nEx2=0, nEx3=0, nEx4=0

But nEx2, nEx3 and nEx4 should all be set to -1.

I have no idea why this is happening. The same code works fine from CodeWarrior and on Windows using Visual Studio. Why are GCC (3.3) & Xcode (1.5) getting messed up?

Has anyone else seen anything like this? I tried creating a simple test case but I cannot reproduce the problem with it. I expect it's something really nasty so I'm hoping someone else has seen this and can point me in the right direction.

Thanks!
_____________________________

Dave Thorup
Software Engineer
email@hidden

http://www.kuwan.net
Defaults Manager - The premier editor for Mac OS X's User Defaults / Preferences database.


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