Subversion Repositories scarts

/* { dg-do run { target *-*-darwin* } } */
 
#include <objc/Object.h>
#include <stdlib.h>
 
typedef struct MyWidget {
  int a;
} MyWidget;
 
MyWidget gWidget = { 17 };
 
@protocol MyProto
- (MyWidget *)widget;
@end
 
@interface Foo: Object
@end
 
@interface Bar: Foo <MyProto>
@end
 
@interface Container: Object
+ (MyWidget *)elementForView:(Foo *)view;
@end
 
@implementation Foo
@end
 
@implementation Bar
- (MyWidget *)widget {
  return &gWidget;
}
@end
 
@implementation Container
+ (MyWidget *)elementForView:(Foo *)view
{
  MyWidget *widget = nil;
  if ([view conformsTo:@protocol(MyProto)]) {
    widget = [(Foo <MyProto> *)view widget];
  }
  return widget;
}
@end
 
int main(void) {
  id view = [Bar new];
  MyWidget *w = [Container elementForView: view];
 
  if (!w || w->a != 17)
    abort ();
 
  return 0;
}