Duck class implementation

Duck.cpp

#include "Duck.h"

#include "QuackBehavior.h"

Duck::Duck(QuackBehavior * quackBehavior) {
  howToQuack = quackBehavior;
}

Duck::~Duck() {
  delete howToQuack;
}

void Duck::quack() {
  howToQuack->quack();
}

void Duck::changeHowToQuack(QuackBehavior * quackBehavior) {
  delete howToQuack;
  howToQuack = quackBehavior;
}