[cfe-dev] Objective-C: Protocol method implemented in class is not recognised by category conforming to protocol

[Fariborz Jahanian]

On Apr 3, 2012, at 6:00 PM, Aidan Steele wrote:

> Hi all,
> 
> Sorry for the mouthful of a subject line, but I wanted it to be
> descriptive. :) I have the following code:
> 
> 	#import <Foundation/Foundation.h>
> 	
> 	@interface Test : NSObject
> 	- (id)testMethod;
> 	@end
> 	
> 	@implementation Test
> 	
> 	- (id)testMethod;
> 	{
> 	  return nil;
> 	}
> 	
> 	@end
> 	
> 	@protocol TestProtocol <NSObject>
> 	- (id)testMethod;
> 	- (id)secondMethod;
> 	@end
> 	
> 	@interface Test (TestCategory) <TestProtocol>
> 	@end
> 	
> 	@implementation Test (TestCategory)
> 	
> 	- (id)secondMethod;
> 	{
> 	  return nil;
> 	}
> 	
> 	@end
> 
> It generates the following warnings:
> 
> 
> 	$ clang test.m
> 	test.m:24:17: warning: incomplete implementation [-Wincomplete-implementation]
> 	@implementation Test (TestCategory)
> 					^
> 	test.m:24:17: warning: method in protocol not implemented [-Wprotocol]
> 	test.m:17:1: note: method declared here
> 	- (id)testMethod;
> 	^
> 	test.m:21:12: note: required for direct or indirect protocol 'TestProtocol'
> 	@interface Test (TestCategory) <TestProtocol>
> 			   ^
> 	2 warnings generated
> 	
> 
> As you can see, the method declared in the protocol is defined in the
> original class implementation and not the category that declares its
> conformance to the protocol. I can't re-define the method in the
> category and call through to "super" as that would go through to
> NSObject.
> 
> My question is this: is this (a) a bug in clang, (b) a bug in my
> understanding or (c) a combination of the above?

(d) bug has already been fixed in TOT.

- fariborz

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