std::function 测试

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__
#include "cocos2d.h"

typedef std::function<void(int code)> TestCallback;
#define CALLBACK_1(__selector__,__target__, ...) std::bind(&__selector__,__target__, std::placeholders::_1, ##__VA_ARGS__)

class HelloWorld : public cocos2d::Layer{
public:
    static cocos2d::Scene* createScene();
    virtual bool init();
    CREATE_FUNC(HelloWorld);
private:
    void handler(int code);
    void testCallback(TestCallback callback);
};

#endif // __HELLOWORLD_SCENE_H__

#include "HelloWorldScene.h"
USING_NS_CC;

Scene* HelloWorld::createScene(){
    auto scene = Scene::create();
    auto layer = HelloWorld::create();
    scene->addChild(layer);
    return scene;
}

bool HelloWorld::init(){
    if ( !Layer::init() )return false;
    testCallback(CALLBACK_1(HelloWorld::handler,this));
    return true;
}

void HelloWorld::handler(int code){
    log("handler:%i",code);
}

void HelloWorld::testCallback(TestCallback callback){
    callback(105);
}

//输出：105