cocos2dx中std::function使用

std::function在cocos2dx中可以用于界面信息交互，回调
当前有界面ALayer，其中有ASprite以及BLayer为ALayer的Child
BLayer中有控件BButton，当BButton触发时通知ALayer的ASprite切换图片
ALayer.cpp

//首先ALyer内，添加BLayer和ASprite
bool ALyer::init()
{
    if ( !Scene::init() )
    {
        return false;
    }

    auto visibleSize = Director::getInstance()->getVisibleSize();
    Vec2 origin = Director::getInstance()->getVisibleOrigin();
    m_pLogo = Sprite::create("zuoqi_head_5.png");
    m_pLogo->setScale(3);
    m_pLogo->setPosition(Vec2(origin.x + visibleSize.width/2,origin.y + visibleSize.height/3*2));// - m_pLogo->getContentSize().height));
    this->addChild(m_pLogo);
    
    m_pBLayer = BLayer::create();
    this->addChild(m_pBLayer,1);
    //这里ALayer定的函数传递给BLayer，达到在BLayer中调用其父节点ALyer的函数
    m_pALayer->SetClickCallBack(CC_CALLBACK_0(HelloWorld::ChangeSprite,this));  
    return true;
}

void ALyer::ChangeSprite()
{
    m_pLogo->initWithFile("zuoqi_head_19.png");
}

BLayer.h

class BLayer:public cocos2d::Layer
{
public:
    static ALayer* create();
    //设置ALayer的监听
    typedef std::function<void()> ccCallByHelloword;
    void SetClickCallBack(ccCallByHelloword callback)
    {
    	//这里接收ALyer传递的参数
        m_callback =callback;
    }
private:
    bool init();
    //点击按钮调用
    void ButtonCallback(cocos2d::Ref* pSender);
    ccCallByHelloword m_callback;
};

BLayer.cpp

void BLayer::ButtonCallback(Ref* pSender)
{
    m_callback();
}