此示例代码中Object *和Ref *之间的区别

Question

HelloWorldScene.cpp

bool HelloWorld::init()
{
    if (!LayerColor::initWithColor(Color4B(255,255,255,255)))
    {
        return false;
    }
    auto item1 = MenuItemImage::create("btn-play-normal.png", "btn-play-selected.png", CC_CALLBACK_1(HelloWorld::doClick1, this));
    auto item2 = MenuItemImage::create("btn-highscores-normal.png", "btn-highscores-selected.png", CC_CALLBACK_1(HelloWorld::doClick2, this));
    auto item3 = MenuItemImage::create("btn-about-normal.png", "btn-about-selected.png", CC_CALLBACK_1(HelloWorld::doClick3, this));
    auto menu = Menu::create(item1, item2, item3, NULL);
    menu->alignItemsVertically();
    this->addChild(menu);
    return true;
}
void HelloWorld::doClick1(Ref* sender)
{
    log("the first menu selected");
}
void HelloWorld::doClick2(Ref* sender)
{
    log("the second menu selected");
}
void HelloWorld::doClick3(Ref* sender)
{
    log("the third menu selected");
}

HelloWorldScene.h

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__
#include "cocos2d.h"
class HelloWorld : public cocos2d::LayerColor
{
public:
    static cocos2d::Scene* createScene();
    virtual bool init();

    // implement the "static create()" method manually
    CREATE_FUNC(HelloWorld);
    void doClick1(Ref* sender);
    void doClick2(Ref* sender);
    void doClick3(Ref* sender);
};
#endif // __HELLOWORLD_SCENE_H__

我正在学习的书中的源代码为void doClick1(Object* sender); 但是，当我编写相同的代码时，我的计算机上发生了一些错误。 为什么Ref*没问题？