#include
#include
#define MAX 10
typedef struct Animal{
void *this;
char name[MAX];
void (*shout)(struct Animal *);
}Animal;
typedef struct Swimmable{
void *this;
void (*swim)(struct Swimmable *);
}Swimmable;
typedef struct Dog{
Animal *Animal;
Swimmable *Swimmable;
}Dog;
typedef struct Cat{
Animal *Animal;
Swimmable *Swimmable;
}Cat;
void shout_Cat(Animal *cat){
printf("%s miaomiao.\n", cat->name);
}
void swim_Cat(Swimmable *cat){
printf("%s cannot swim.\n", ((Cat *)(cat->this))->Animal->name);
}
void shout_Dog(Animal *dog){
printf("%s wangwang.\n", dog->name);
}
void swim_Dog(Swimmable *dog){
printf("%s can swim.\n", ((Dog *)(dog->this))->Animal->name);
}
void visit_Animal(Animal *animal){
animal->shout(animal);
}
void visit_Swimmable(Swimmable *swimmable){
swimmable->swim(swimmable);
}
void initialize_Dog(Dog* dog, char *name){
dog->Animal = (Animal *) malloc(sizeof(Animal));
dog->Animal->this = dog;
dog->Animal->shout = shout_Dog;
strcpy(dog->Animal->name, name);
dog->Swimmable = (Swimmable *) malloc(sizeof(Swimmable));
dog->Swimmable->this = dog;
dog->Swimmable->swim = swim_Dog;
}
void initialize_Cat(Cat* cat, char *name){
cat->Animal = (Animal *) malloc(sizeof(Animal));
cat->Animal->this = cat;
cat->Animal->shout = shout_Cat;
strcpy(cat->Animal->name, name);
cat->Swimmable = (Swimmable *) malloc(sizeof(Swimmable));
cat->Swimmable->this = cat;
cat->Swimmable->swim = swim_Cat;
}
void finalize_Dog(Dog *dog){
free(dog->Animal);
free(dog->Swimmable);
}
void finalize_Cat(Cat *cat){
free(cat->Animal);
free(cat->Swimmable);
}
void main(){
Dog dog;
Cat cat;
clrscr();
initialize_Dog(&dog, "Wangcai");
initialize_Cat(&cat, "Kitty");
visit_Animal(dog.Animal);
visit_Animal(cat.Animal);
visit_Swimmable(dog.Swimmable);
visit_Swimmable(cat.Swimmable);
finalize_Dog(&dog);
finalize_Cat(&cat);
}
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