| 1 | #include <cll1.h> |
| 2 | |
| 3 | /* This is C<<1 rewrite of object polymorphism from |
| 4 | http://en.wikipedia.org/wiki/Polymorphism_in_object-oriented_programming */ |
| 5 | |
| 6 | struct Animal |
| 7 | { |
| 8 | use_interface(AnimalActions); |
| 9 | char *name; |
| 10 | }; |
| 11 | |
| 12 | struct AnimalActions |
| 13 | { |
| 14 | const char *(method(talk)); |
| 15 | } |
| 16 | |
| 17 | struct *Animal get_animal(char *name, struct AnimalActions *interface) |
| 18 | { |
| 19 | struct *Animal animal=get_object(Animal,interface); |
| 20 | animal->name=name; |
| 21 | return animal; |
| 22 | } |
| 23 | |
| 24 | const char *cat_talk(void *_self) |
| 25 | { |
| 26 | return "Meow!"; |
| 27 | } |
| 28 | |
| 29 | const char *dog_talk(void *_self) |
| 30 | { |
| 31 | return "Arf! Arf!"; |
| 32 | } |
| 33 | |
| 34 | interface_implementation(CatActions,AnimalActions) |
| 35 | { |
| 36 | bind_method(talk,cat_talk); |
| 37 | } |
| 38 | |
| 39 | interface_implementation(DogActions,AnimalActions) |
| 40 | { |
| 41 | bind_method(talk,dog_talk); |
| 42 | } |
| 43 | |
| 44 | program |
| 45 | { |
| 46 | int i; |
| 47 | struct Animals *animal[3]; |
| 48 | struct AnimalActions *cat = get_interface(CatActions); |
| 49 | struct AnimalActions *dog = get_interface(DogActions); |
| 50 | |
| 51 | animal[0]=get_animal("Missy",cat); |
| 52 | animal[0]=get_animal("Mr. Bojangles",cat); |
| 53 | animal[0]=get_animal("Lassie",dog); |
| 54 | |
| 55 | for_range(i,0,2) |
| 56 | printf("%s: %s\n",animal[i].name,(_(animal[i],talk))); |
| 57 | |
| 58 | } |