[LLVMbugs] [Bug 4555] New: Doesn't support valid obj-c declaration: -(Class<MyClass>) currentCounterPolicy

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4555

           Summary: Doesn't support valid obj-c declaration: -
                    (Class<MyClass>) currentCounterPolicy
           Product: clang
           Version: unspecified
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: major
          Priority: P2
         Component: parser
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: macta at pobox.com
                CC: llvmbugs at cs.uiuc.edu


XCode 3.1.x correctly compiles the following (only snippets shown - but I think
the idea should be clear. Basically it provides a hierarchy of Policy counter
objects, classes are used as singleton objects - each with a different static
implementation):

Clang gives the following error:
Model.h:38:22: error: protocol qualified 'Class' is unsupported
-(Class<CounterPolicy>) currentCounterPolicy;
  ~~~~~~~~~~~~~~~~~~~^
1 diagnostic generated.


Code snippets:

Model.h

...
#import "ModelPolicies.h"
...

@interface Model : NSObject {
// inst var declarations etc.
...

// The line Clang reports an error on
-(Class<CounterPolicy>) currentCounterPolicy; 


Model.m
....

// Create a static list of counter policy objects
+(NSArray *) availableCounters {
        return [[[NSArray alloc] initWithObjects: [CurrentListCounter class],
[FavouritesCounter class], [AllListsCounter class], [NullCounter class], nil]
autorelease];

}

-(Class<CounterPolicy>) currentCounterPolicy {
        return [[Model availableCounters] objectAtIndex:
self.badgeCounterIndex];
}



ModelPolicies.h

@protocol CounterPolicy

+(NSInteger) countFor: (MyModel *)model;
+(NSString *) description;
@end

@interface CurrentListCounter : NSObject <CounterPolicy> 

+(NSInteger) badgeCountFor: (MyModel *)model;
+(NSString *) description;

@end

@interface NullCounter : NSObject <CounterPolicy> 

+(NSInteger) badgeCountFor: (MyModel *)model;
+(NSString *) description;

@end


-- 
Configure bugmail: http://llvm.org/bugs/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.