1 @protocol P @end 2 3 @interface NSMutableArray 4 - (id)objectAtIndexedSubscript:(unsigned int)index; 5 - (void)setObject:(id)object atIndexedSubscript:(unsigned int)index; 6 @end 7 8 @interface NSMutableDictionary 9 - (id)objectForKeyedSubscript:(id)key; 10 - (void)setObject:(id)object forKeyedSubscript:(id)key; 11 @end 12 13 void all() { 14 NSMutableArray *array; 15 id oldObject = array[10]; 16 17 array[10] = oldObject; 18 19 NSMutableDictionary *dictionary; 20 id key; 21 id newObject; 22 oldObject = dictionary[key]; 23 24 dictionary[key] = newObject; 25 } 26 27
