Re: Unclear on -initWithBytesNoCopy:
Re: Unclear on -initWithBytesNoCopy:
- Subject: Re: Unclear on -initWithBytesNoCopy:
- From: Charles Srstka <email@hidden>
- Date: Mon, 05 Mar 2012 22:36:24 -0600
On Mar 3, 2012, at 3:03 PM, Eli Bach2 wrote:
>
> On Mar 3, 2012, at 12:15 PM, Jens Alfke wrote:
>
>> I filed a bug report* saying that this substring optimization shouldn’t be used if the source string uses an external buffer, just as it shouldn’t if the source string is mutable. They fixed it, but some people there argue that their original implementation was correct (even if not compatible with Apple’s.) I’m curious, so I’m asking here to see if anyone knows for sure what’s intended.
>
> Well, you can argue that the substring can't just reference the original string and bump it's retaincount to make sure the underlying data stays around because the original string doesn't own the data buffer. For it to be 'correct', there would at least need to be some mechanism to notify the data buffer owner that another object was using it.
I’m not sure I’d want that either, though. If the original string was a 200-page dissertation and you took a one-word substring from it, it doesn’t seem reasonable to keep the whole 200-page dissertation all in RAM just to keep the one-word substring around.
Charles
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