[cfe-dev] ObjC++ and MyObjCClass.class syntax

[Jean-Daniel Dupas]

You can't use class as a property name or as an ivar name in objc++

This extension is just to be able to write for example:

[obj isKindOfClass:NSString.class] 

instead of 

[obj isKindOfClass:[NSString class]]


As the +(Class)class method is defined on NSObject, this syntax may virtually be used by any ObjC class.

I know this syntax is "abusing" the new property syntax as it uses it to call a standard accessor method (not defined as a property), but this kind of "abuse" is supported for all other accessors name and g++ support it for 'class', so it may be worth supporting it too.

Here is a test case accepted by g++ but rejected by clang:
---------------------------------
@interface I {
 int cls;
}

+ (int)class;

@end

@implementation  I
- (int) Meth { return I.class; }
@end
---------------------------------

Le 11 août 2010 à 19:57, Fariborz Jahanian a écrit :

> Can you provide a test case. I see that in this case 'class' is supported as property name in objective-c mode (but not objective-c++).
> g++ ObjC++  does not support it either.
> 
> @interface I
> {
>  int class;
> }
> @property int class;
> @end
> 
> @implementation  I
> - (int) Meth { I* Foo; return Foo.class; }
> @end
> 
> 
> % gcc -ObjC++ t.m
> t.m:3: error: expected identifier before ';' token
> t.m:5: error: expected identifier before ';' token
> t.m: In function 'int -[I Meth](I*, objc_selector*)':
> t.m:9: error: expected unqualified-id before 'class'
> t.m:9: error: expected ';' before 'class'
> - Fariborz
> 
> 
> On Aug 11, 2010, at 9:40 AM, Jean-Daniel Dupas wrote:
> 
>> Hello,
>> 
>> I would like to know if it is acceptable to add a special case in the parser to support the Foo.class syntax in ObjC++ (where Foo is an ObjC class).
>> This syntax already works in classic ObjC, and is supported by GCC in both ObjC and ObjC++. But actually, clang does not support it.
>> 
>> Thanks
>> <Class.class.patch>
>> 
>> 
>> -- Jean-Daniel
>> 
>> 
>> 
>> 
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> 

-- Jean-Daniel