On Sun, Nov 8, 2009 at 12:11 PM, Stuart Malin <stu...@zhameesha.com> wrote:
> On Nov 8, 2009, at 2:56 PM, Adam R. Maxwel wrote:
>
>> On Nov 8, 2009, at 3:03 AM, Ken Tozier wrote:
>>
>>> "Control reaches end of non-void function"
>>>
>>> I Googled for "Objective-C accessors and @synchrinized" which seemed to
>>> indicate that the following was the correct way to handle it
>>>
>>> - (id) someMethod
>>> {
>>> �...@synchronized(self)
>>> {
>>> return [somevalue autoreleae];
>>> }
>>> }
>>>
>>> But I get the above error whenever I try to do it that way. Here's one of
>>> the actual methods with and without the @synchronized directive
>>
>> http://lists.apple.com/archives/Xcode-users/2009/Aug/msg00230.html
>>
>> More info can be found using google:
>>
>>
>> http://www.google.com/search?hl=en&q=site%3Alists.apple.com+%40synchronized+Control+reaches+end+of+non-void+function&aq=f&oq=&aqi=
>
> Whether this warning is a bug (as suggested by the 00230 post referenced
> above) or not, I don't know (I'm way at the extreme end of my programmer's
> union card on this one).
The warning is a bug, and can be safely ignored. The compiler isn't
able to do the proper flow analysis to see that all ways out of the
function return a valid value. If you don't like ignoring warnings,
you can adjust your code to work around it:
- (id) someMethod
{
id result = nil;
@synchronized(self)
{
result = [somevalue autoreleae];
}
return result;
}
> But I suspect that from the posters comments in the
> post I reference below, it isn't a bug. The problem is, you can't return up
> the calling chain while being synchronized. Do whatever work it is that
> needs to be performed in a synchronized way, then return whatever result
> needs to be returned.
That is not true. @synchronized (as well as @try/@catch/@finally)
behave properly in the presence of returns. The problem here is in the
compiler's diagnostics, not in the code generated
--
Clark S. Cox III
clarkc...@gmail.com
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