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: Greg Parker <email@hidden>
- Date: Mon, 22 Dec 2008 13:54:19 -0800
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).
I can observe all this with logging and debugging.
Does anybody know, if this is normal behavior, or what else? It
looks like there is an annoying difference: With zombies enabled,
dealloc methods of Objective-C are invoked, but destructors of C++
are not called.
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.
--
Greg Parker email@hidden Runtime Wrangler
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