| 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 | Of course there are easier ways to do the same thing... :-) |
| 7 | (G)2008 xChas */ |
| 8 | |
| 9 | def_mem(Actions) |
| 10 | { |
| 11 | str method(talk) (anonymous self); |
| 12 | }; |
| 13 | |
| 14 | def_mem(Animal) |
| 15 | { |
| 16 | interface(Actions); |
| 17 | char *name; |
| 18 | }; |
| 19 | |
| 20 | construct(Animal) (Animal self, str name) |
| 21 | { |
| 22 | self->name = name; |
| 23 | return self; |
| 24 | } |
| 25 | |
| 26 | str cat_talk(anonymous self) |
| 27 | { |
| 28 | return "Meow!"; |
| 29 | } |
| 30 | |
| 31 | str dog_talk(anonymous self) |
| 32 | { |
| 33 | return "Arf! Arf!"; |
| 34 | } |
| 35 | |
| 36 | Actions cat_actions(void) |
| 37 | { |
| 38 | Get_mem(this,Actions); |
| 39 | |
| 40 | this->talk = cat_talk; |
| 41 | return this; |
| 42 | } |
| 43 | |
| 44 | Actions dog_actions(void) |
| 45 | { |
| 46 | Get_mem(this,Actions); |
| 47 | |
| 48 | this->talk = dog_talk; |
| 49 | return this; |
| 50 | } |
| 51 | |
| 52 | program |
| 53 | { |
| 54 | int i; |
| 55 | Animal animal[3]; |
| 56 | Actions cat = cat_actions(); |
| 57 | Actions dog = dog_actions(); |
| 58 | |
| 59 | animal[0] = get_obj(Animal,cat,"Missy"); |
| 60 | animal[1] = get_obj(Animal,cat,"Mr. Bojangles"); |
| 61 | animal[2] = get_obj(Animal,dog,"Lassie"); |
| 62 | |
| 63 | for_range(i, 0, 2) |
| 64 | { |
| 65 | print(animal[i]->name,":",_(talk,animal[i])); |
| 66 | } |
| 67 | } |