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I want to define one protocol with few properties and need to use those properties in another NSObject subclass. Please give me link or example code. I need that to work with 10.5. Thanks PLEASE CHECK THE FOLLOWING SAMPLE CODE @protocol MyProtocol @property (nonatomic, readonly) id someObject; @property (nonatomic, getter=isAlive) BOOL alive; @end #import "MyProtocol.h" @interface MyCustomClass : NSObject <MyProtocol>{ } @end #import "MyCustomClass.h" @implementation MyCustomClass @synthesize someObject,alive; /* - (id)someObject { return nil; } - (BOOL)isAlive { return YES; } - (void)setAlive:(BOOL)aBOOL { } */ @end **Added: Compling code with x86_64 architecture works fine. But error if i'll change the architecture to i386, then i am getting following warnings: MyCustomClass.m:13: error: synthesized property 'someObject' must either be named the same as a compatible ivar or must explicitly name an ivar error: synthesized property 'alive' must either be named the same as a compatible ivar or must explicitly name an ivar I just want to know why it is working in x86_64 with @synthesize and not in i386.**

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