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

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Tue Jul 14 03:43:44 PDT 2009


           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

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

Code snippets:


#import "ModelPolicies.h"

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

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


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


-(Class<CounterPolicy>) currentCounterPolicy {
        return [[Model availableCounters] objectAtIndex:


@protocol CounterPolicy

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

@interface CurrentListCounter : NSObject <CounterPolicy> 

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


@interface NullCounter : NSObject <CounterPolicy> 

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


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