/* see http://mjtsai.com/blog/2006/07/15/cocoa-foreach-macro/
 * You must set the ÒC Language DialectÓ in Xcode to C99
 */
#define foreachGetEnumerator(c) \
    ([c respondsToSelector:@selector(objectEnumerator)] ? \
     [c objectEnumerator] : \
     c)
#define foreachGetIMP(e) \
    [foreachEnum methodForSelector:@selector(nextObject)]
#define foreachCallIMP(imp, e) \
    ((IMP)imp)(e, @selector(nextObject))
#define foreachGetFirst(imp, e) \
    (e ? foreachCallIMP(imp, e) : nil)
#define foreach(object, collection) \
    for ( id foreachCollection = collection, \
             foreachEnum = foreachGetEnumerator(foreachCollection), \
             foreachIMP = (id)foreachGetIMP(foreachEnum), \
             object = foreachGetFirst(foreachIMP, foreachEnum); \
          object; \
          object = foreachCallIMP(foreachIMP, foreachEnum) )
#define foreacht(type, object, collection) \
    for ( type foreachCollection = (id)collection, \
               *foreachEnum = (id)foreachGetEnumerator((id)foreachCollection), \
               *foreachIMP = (id)foreachGetIMP((id)foreachEnum), \
               *object = foreachGetFirst(foreachIMP, foreachEnum); \
          object; \
          object = foreachCallIMP(foreachIMP, foreachEnum) )