On Jan 29, 2013, at 1:22 AM, Quincey Morris
<[email protected]> wrote:
> ** Here's an example that will crash with an early return:
>
> if (self) {
> if (foo == nil)
> return nil;
> _foo = foo;
> _bar = malloc (100);
> .....
> }
> …..
> - (void) dealloc {
> free (_bar);
> }
Actually this is fine, because free(NULL) is legal. A better example would be a
dealloc that calls CFRelease, because [for some reason] CFRelease does crash if
passed NULL.
I would argue that the bug here is in the dealloc method. Dealloc methods
should be written to run correctly if the init method was not called or had to
back out partway through. (And this is, I think, one of the reasons why +alloc
zeroes out the bytes of an object.)
—Jens
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