cat.c

#include <stdio.h>
#include <string.h>
#include "animal.h"
#include "cat.h"

/* private methods */
static void cat_food(struct cat_s const *cato);
static void cat_meow(struct cat_s const *cato);

static void cat_food(struct cat_s const *cato)
{
	printf("[%s] eats cat food\n", cato->animal.name);
}

static void cat_meow(struct cat_s const *cato)
{
	printf("[%s] says meeoww!\n", cato->animal.name);
}

/* public methods */
int cat_age(struct cat_s *cato)
{
	return cato->age;
}

int cat_weight(struct cat_s *cato)
{
	return cato->weight;
}

/* Cat constructor */
void cat_ctor(struct cat_s *cato, char *name, int age, int weight)
{
	/* call superclass constructor */
	animal_ctor(&cato->animal, name);
	
	/* initialize subclass attributes / virtual functions */
	static struct animal_vtab_s const vtbl = {&cat_food, &cat_meow};
	cato->animal.vptr = &vtbl;
	cato->age = age;
	cato->weight = weight;
}