On 12/07/2009, at 23:23 , Ben Cox wrote:
NSString +stringByAppendingString:(NSString*) returns an autoreleased
string. If you release it explicitly, your application will crash.
On 13/07/2009, at 0:02 , Bill Bumgarner wrote:
After the second assignment, htmlString is no longer a literal
string, but will be a reference to whatever is returned by -
stringByAppendingString:.
That would be an autoreleased string so, no, the -release isn't
necessary.
I know you guys probably know this, but to be technically accurate,
there is no guarantee the return value of stringByAppendingString
returns an autoreleased string.
All you know is that it returns a string *you do not own*. You are
not responsible for releasing it, and you are responsible for
retaining it if you want it to stick around.
For example, [immutablestr stringByAppendingString:@""] quite possibly
just returns. [immutablestr stringByAppendingString:@"Fred"] called
twice in a row might return the same string both times. You don't
know, and you should not care.
The memory management rules say nothing about "autoreleased" or
"retain count".
This is largely irrelevant and trivial if you know the rules - but if
you don't know the rules it is important not to misunderstand the
distinction.
Enjoy,
Peter.
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