How to implement a hash table in C (2021)(benhoyt.com)

  // generic monster "class"
  struct monster_t {
    int health;
    struct weapon_t *weapon;
    // etc..

    void (*attack)(struct monster_t *self);   // our function pointer
    // more function pointers for update, die, hit, etc...
  };

  // impl
  void monster_notassigned_attach(struct monster_t *monster) {  // safety net (todo)
    printf("Attack not assigned to monster...\n");
  }

  void monster_dragon_attack(struct monster_t *monster) {
    // attack for dragon
    printf("Dragon is attacking you...\n");
  }

  void monster_wizard_attack(struct monster_t *monster) {
    // attack for wizard
    printf("Wizard is attacking you...\n");
  }


  // creation
  void monster_dragon_create(struct monster_t *monster) {
    // allocate, then assign.. and do...
    monster->attack = monster_dragon_attack;
  }

  void monster_wizard_create(struct monster_t *monster) {
    // allocate, then assign.. and do...
    monster->attack = monster_wizard_attack;
  }
  
  void main() {
    // testing...
    struct monster_t monsters[10];       // can store various monsters!
  
    monster_dragon_create(&monsters[0]);
    monster_wizard_create(&monsters[1]);  

    for(int i = 0; i < 2; ++i) {
      monsters[i].attack(&monsters[i]);  // yeah you have to pass it in...
    }
  }