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POClass Composition Error?
 

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  1. POClass Composition Error?
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    <p>I wonder if someone can explain where I am going wrong here, I am creating 2 objects (car &amp; engine) where the car object contains a pointer to the engine object. I know I am missing the obvious or just making some silly mistake, but I can't quite put my finger on it.</p> <p>NB: the code all works, except for the line that is comment ERROR.</p> <pre><code>// INTERFACE ------------------------------------------------------- ** @interface EngineClass : NSObject { } @end @interface CarClass : NSObject { EngineClass *engine; } - (void)setEngine:(EngineClass *)value; @end // IMPLEMENT ------------------------------------------------------- ** @implementation CarClass - (void)setEngine:(EngineClass *)newEngine { if (engine != newEngine) { [engine release]; engine = [newEngine copy]; } } @end @implementation EngineClass @end // MAIN ------------------------------------------------------------ ** #import &lt;Foundation/Foundation.h&gt; int main (int argc, const char * argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; CarClass *newCar_001; EngineClass *newEngine_001; newCar_001 = [[CarClass alloc] init]; newEngine_001 = [[EngineClass alloc] init]; [newCar_001 setEngine: newEngine_001]; // ERROR // Clean up [newCar_001 release]; [newEngine_001 release]; [pool drain]; return 0; } // END ------------------------------------------------------------- ** </code></pre> <p>The ERROR is ....</p> <p>run 2009-09-22 13:41:05.483 cocoa_engine_TEST[8606:a0f] 2009-09-22 13:41:05.485 cocoa_engine_TEST[8606:a0f] 2009-09-22 13:41:05.485 cocoa_engine_TEST[8606:a0f] -[EngineClass copyWithZone:]: unrecognized selector sent to instance 0x10010c8d0 2009-09-22 13:41:05.486 cocoa_engine_TEST[8606:a0f] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[EngineClass copyWithZone:]: unrecognized selector sent to instance 0x10010c8d0'</p> <p>cheers -gary-</p>
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