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Basic vtables for emulate OOP
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#include <stdio.h> | |
#define Method(x, y, type) ((type)(x->methods[y] ))(x) | |
#pragma pack(1) | |
typedef struct { | |
void* space; | |
void** methods; | |
size_t size; | |
int methods_size; | |
} table; | |
table* Animal(char* a, char* (*eat) (struct table* self)) { | |
table* animal = malloc(sizeof(table)); | |
animal->space = malloc(256); | |
animal->size = 256; | |
memcpy(animal->space, a, strlen(a)+1); | |
animal->methods = malloc(sizeof(void*)); | |
animal->methods[0] = eat; | |
animal->methods_size = 1; | |
return animal; | |
} | |
table* Wolf(table* animal, char* a, char* (sound) (struct table* self)) { | |
memcpy(animal->space, a, strlen(a)+1); | |
animal->methods_size++; | |
animal->methods = realloc(animal->methods, animal->methods_size*sizeof(void*)); | |
animal->methods[1] = sound; | |
return animal; | |
} | |
table* Dog(table* wolf, char* a, char* (sound) (struct table* self)) { | |
memcpy(wolf->space, a, strlen(a)+1); | |
wolf->methods_size++; | |
wolf->methods = realloc(wolf->methods, wolf->methods_size*sizeof(void*)); | |
wolf->methods[2] = sound; | |
return wolf; | |
} | |
int main() | |
{ | |
void eat(table* self) { | |
printf("I am a %s\n", (char*)self->space); | |
} | |
table* animal = Animal("Animal", eat); | |
Method(animal, 0, void (*) (table* self)); | |
void howl(table* self) { | |
printf("howww\n"); | |
} | |
table* wolf = Wolf(animal, "Wolf", howl); | |
Method(wolf, 0, void (*) (table* self)); | |
Method(wolf, 1, void (*) (table* self)); | |
void bark(table* self) { | |
printf("au au"); | |
} | |
table* dog = Dog(wolf, "Dog", bark); | |
Method(dog, 0, void (*) (table* self)); | |
Method(dog, 1, void (*) (table* self)); // A dog can also howl | |
Method(dog, 2, void (*) (table* self)); | |
return 0; | |
} |
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