Showing the strategy pattern at work

QuackStrategyMain.cpp

#include "Duck.h"
#include "QuackBehaviors/Quack.h"
#include "QuackBehaviors/Squeak.h"
#include "QuackBehaviors/MuteQuack.h"

int main(int argc, const char **argv) {
  Duck duck(new Quack);

  duck.quack();

  duck.changeHowToQuack(new Squeak);

  duck.quack();

  duck.changeHowToQuack(new MuteQuack);

  duck.quack();

  return 0;
}