well I found some information in the NSObject's retainCount method
documentation:
"You rarely send a retainCount message; however, you might implement
this method in a class to implement your own reference-counting
scheme. For objects that never get released (that is, theirrelease
method does nothing), this method should return UINT_MAX, as defined
in <limits.h>"
but UINT_MAX is 4294967295 (0xFFFFFFFF)
so what does 0x7FFFFFFF mean?
thanks
Dmitry,
I don't think this is explicitly spelled out anywhere, but for CF
"constants", such as CFSTR("blah"), kCFBooleanFalse, and other
constant 'things' like this, there is no real meaning to releasing
them, but depending on your program's abstraction classes or whatever,
you may retain/release these CF constants. I believe CF special-cases
this specific retaincount as a do-nothing operation.
And 0x7FFFFFFF would be INT_MAX or SINT_MAX (which is the maximum for
a signed long (which is what a CFIndex is, which is the return type
for CFGetRetainCount()) [at least for 32-bit architecture, probably
for 64-bit architecture].
Technically, you could retain any given CF object enough to hit this
value, but you're program probably would have other problems before
you hit this limit.
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