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/* gcc version 9.2.0 (GCC) */

#include <stdio.h>
#include <stdlib.h>
#include "..."

interface(Flyable) {
    void (*fly)(void);
};
interface(Quackable) {
    void (*quack)(void);
};
abstract class(Duck) {
    void (*set_flyable)(Flyable*);
    void (*set_quackable)(Quackable*);
    void (*fly)(void);
    void (*quack)(void);
  private(Duck);
    Flyable* flyable;
    Quackable* quackable;
    abstract void (*display)(void);
};

// SuperFly
Class(SuperFly) { implements(Flyable); };
void SuperFly_fly(void) { puts("I'm super flying!"); }
__new__(SuperFly) { meth(SuperFly, fly); }

// SuperQuack
Class(SuperQuack) { implements(Quackable); };
void SuperQuack_quack(void) { puts("I'm super quacking!"); }
__new__(SuperQuack) { meth(SuperQuack, quack); }

// impl Duck
void Duck_set_flyable(Flyable* fly) {
    is(Duck);
    this->flyable = fly;
}
void Duck_set_quackable(Quackable* quack) {
    is(Duck);
    this->quackable = quack;
}
void Duck_fly(void) {
    is(Duck);
    $(this->flyable).fly();
}
void Duck_quack(void) {
    is(Duck);
    $(this->quackable).quack();
}
__new__(Duck) { meth(Duck, set_flyable, set_quackable, fly, quack); }

// super duck
Class(SuperDuck) { extends(Duck); };
void SuperDuck_display(void) { puts("I'm super duck!"); }
__new__(SuperDuck) {
    super(Duck);
    meth(SuperDuck, display);
}

/*   m a i n   */
__main__(void) {
    my duck  = new (SuperDuck);
    my fly   = new (SuperFly);
    my quack = new (SuperQuack);
    $(duck).set_flyable(fly);
    $(duck).set_quackable(quack);
    $(duck).fly();
    $(duck).quack();
    $(duck).display();
}