scene.cpp

// leaks memory because a copy of the value of scene is returned and the pointer is never deleted
Image Scene::draw() const {
  Image scene = *(new Image());

  // build the scene

  return *scene;
}

// doesn't leak memory, but is ugly
Image Scene::draw() const {
  Image *tmp = new Image();
  Image scene = *tmp;
  delete tmp;

  // build the scene

  return scene;
}