> On May 6, 2016, at 1:35 PM, John McCall <rjmcc...@apple.com> wrote:
>
>> On May 6, 2016, at 1:32 PM, Carl Hoefs <newsli...@autonomy.caltech.edu>
>> wrote:
>> I'm building for iOS 9.3, and am using NSOperationQueue throughout. Once in
>> a while, NSOperationQueue -addOperation: throws an exception. I guess this
>> is a well-known bug going all the way back to 2008. I found Mike Ash's
>> writeup on the issue, and have downloaded his replacement class,
>> RAOperationQueue. However, it was written long ago for GC not ARC. I have
>> one remaining problem in converting the code.
>>
>> - (BOOL)_runOperationFromList: (RAAtomicListRef *)listPtr sourceList:
>> (RAAtomicListRef *)sourceListPtr
>> {
>> RAOperation *op = [self _popOperation: listPtr];
>> if( !op )
>> {
>> *listPtr = RAAtomicListSteal( sourceListPtr );
>> // source lists are in LIFO order, but we want to execute
>> operations in the order they were enqueued
>> // so we reverse the list before we do anything with it
>> RAAtomicListReverse( listPtr );
>> op = [self _popOperation: listPtr];
>> }
>>
>> if( op )
>> [op run]; <-- ERROR HERE
>>
>> return op != nil;
>> }
>>
>> The error I'm getting is: Receiver type 'RAOperation' for instance message
>> is a forward declaration.
>>
>> What does this error mean, and how can I fix it?
>
> It means you haven't #included the header with the @interface declaration for
> RAOperation.
>
Indeed, that silenced the error, thanks!
I would have thought that this earlier line would have been flagged if
RAOperation.h hadn't been included:
RAOperation *op = [self _popOperation: listPtr];
-Carl
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