btnNext = ScalableSprite::create("next.png",	[this, nextChapter, nextLevel, showNext]() {	m_doneLayer->removeFromParent();	m_doneLayer = nullptr;	m_nChapter = nextChapter;	m_nLevel = nextLevel; this->loadLevel(); this->scaleBlocks(0);	} );

typedef std::function<void(Ref *, Touch *, Event *)> touchCallback;

class Block : public Node { CC_CONSTRUCTOR_ACCESS: virtual ~Block() {} virtual bool init(const Color4B& bgColor, const string& title, const touchCallback& onTouchEnd, const touchCallback& onTouchBegan, const touchCallback& onTouchMoved, const touchCallback& onTouchCancelled); }; 

class DraggableBlock : public Block { // ... };