Why doesn't this compile?
NSComparisonResult (^comp)( id<DKStorableObject>, id<DKStorableObject>
) = ^( id<DKStorableObject> a, id<DKStorableObject> b )
{
if( a.index < b.index )
return NSOrderedAscending;
else if ( a.index > b.index )
return NSOrderedDescending;
else
return NSOrderedSame;
};
error: incompatible block pointer types initializing 'NSComparisonResult
(^)(id<DKStorableObject>, id<DKStorableObject>)' with an expression of type
'int (^)(id<DKStorableObject>, id<DKStorableObject>)'
Why does it assume that the return type is 'int"? There is nothing here that
appears to suggest it is one. NSComparisonResult is a typedef of NSInteger. If
I attempt to cast the result, I get an equally baffling error:
error: invalid block pointer conversion initializing 'NSComparisonResult
(^)(id<DKStorableObject>, id<DKStorableObject>)' with an expression of type
'NSComparisonResult' (aka 'long')
I see there is a typedef for a generic comparator already, but I want to
declare it as conforming to a protocol.
Could the stupid block syntax be any less intuitive?
--Graham
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