MyOperation is a subclass of NSOperation:

#import "MyOperation.h"

@interface MyOperation()        
@property (assign)      NSUInteger  start;              
@end

@implementation MyOperation

- initWithStart:(NSUInteger)s ;
{
        self = [ super init ];
        if ( self == nil ) return nil;
        _start = s;
        return self;
}

- (void)main
{
        NSLog(@"%s start %lu",__FUNCTION__,  self.start );
}

@end

Then I created one instance of MyOperation and added it to an NSOperationQueue 
and nothing happened - no NSLog to be seen.

When I changed the property from "start" to "stArt" then all became fine. 
Obviously "start" is a word one should not use with NSOperations (no idea why).

But: should there not be some compiler warning?  Using Xcode 5.0.2.

Gerriet.


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