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

[Aidan Steele]

Well don't I look silly!

Thank you very much for your quick answer to my dumb question. :)

On Wed, Apr 4, 2012 at 11:05 AM, Fariborz Jahanian <fjahanian at apple.com> wrote:
>
> 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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>