unit_test_pimpl

// scene.hpp

class Scene
{
public:
  Scene();
	virtual ~Scene();
	virtual void addObject( SceneObject* object );
	virtual void render();

private:
	class Impl;
	Impl& impl_;
};

// scene.cpp

class Scene::Impl
{
public:
	void	complexProcessing();
	void	moreComplexProcessing();
	void	render();

	std::vector<SceneObj*> objects_;
};

Scene::Scene():impl_( new Scene::Impl) {}

void Scene::addObject( SceneObject* object  )
{
	impl_.objects_.push_back( object )
}

void Scene::draw()
{
	impl_.complexProcessing();
	impl_.moreComplexProcessing();
	impl_.render();
}