| 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_type(Animal); |
| 10 | |
| 11 | def_mem(Actions) |
| 12 | { |
| 13 | str method(talk) (Animal self); |
| 14 | }; |
| 15 | |
| 16 | def_obj(Animal) |
| 17 | { |
| 18 | interface(Actions); |
| 19 | char *name; |
| 20 | }; |
| 21 | |
| 22 | construct(Animal,Actions) (Animal self, str name) |
| 23 | { |
| 24 | self->name = name; |
| 25 | return self; |
| 26 | } |
| 27 | |
| 28 | /* implementation of methods */ |
| 29 | |
| 30 | str catTalk(Animal self) |
| 31 | { |
| 32 | return "Meow!"; |
| 33 | } |
| 34 | |
| 35 | str dogTalk(Animal self) |
| 36 | { |
| 37 | return "Arf! Arf!"; |
| 38 | } |
| 39 | |
| 40 | /* registration of methods to object interface */ |
| 41 | |
| 42 | Actions catActions(void) |
| 43 | { |
| 44 | Get_mem(this, Actions); |
| 45 | |
| 46 | this->talk = catTalk; |
| 47 | return this; |
| 48 | } |
| 49 | |
| 50 | Actions dogActions(void) |
| 51 | { |
| 52 | Get_mem(this, Actions); |
| 53 | |
| 54 | this->talk = dogTalk; |
| 55 | return this; |
| 56 | } |
| 57 | |
| 58 | /* usage of objects inside C<<1 program */ |
| 59 | |
| 60 | program |
| 61 | { |
| 62 | int i; |
| 63 | Animal animal[3]; |
| 64 | Actions cat = catActions(); |
| 65 | Actions dog = dogActions(); |
| 66 | |
| 67 | animal[0] = get_obj(Animal, cat, "Missy"); |
| 68 | animal[1] = get_obj(Animal, cat, "Mr. Bojangles"); |
| 69 | animal[2] = get_obj(Animal, dog, "Lassie"); |
| 70 | |
| 71 | for_range(i, 0, 2) |
| 72 | { |
| 73 | print(animal[i]->name, ":", _(talk,animal[i])); |
| 74 | } |
| 75 | } |