Re: C++ instance variables not destructed if NSZombieEnabled
Re: C++ instance variables not destructed if NSZombieEnabled
- Subject: Re: C++ instance variables not destructed if NSZombieEnabled
- From: Klaus Backert <email@hidden>
- Date: Tue, 23 Dec 2008 01:43:36 +0100
On 22.12.2008, at 22:54, Greg Parker wrote:
On Dec 22, 2008, at 6:49 AM, Klaus Backert wrote:
In an application of mine I have some Objective-C classes with C++
instance variables (the Objective-C things own the C++ things). I
build with the option GCC_OBJC_CALL_CXX_CDTORS = YES, i.e. run non-
trivial default constructors and destructors on C++ instance
variables of Objective-C classes.
As long as I do *not* set the environment variable NSZombieEnabled
to YES, everything works like this: Constructors of C++ instance
variables have been called when returning from NSObject's init, and
destructors have been called when returning from NSObject's dealloc.
But if I do set NSZombieEnabled to YES, then the destructors are
*not* called anymore (by the way, setting NSDeallocateZombies to
YES or NO does not make a difference).
It's a loophole in the implementation of NSZombie. Sorry. You might
be able to use Guard Malloc instead (man libgmalloc); it doesn't
have that destructor problem.
Thank you for this very useful information.
When debugging with Guard Malloc – and without zombies enabled –, the C
++ destructors are called again indeed. I'm glad.
But, because the slowdown is remarkable – which I expected, because
man libgmalloc tells about it –, I will not use this all the time
during debugging, as I did with zombies enabled previously.
Kind regards
Klaus
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