Some C++ sugar for cocos2d-x

jrbcococ.hpp

#ifndef JRB_COCOS_H
#include <stdexcept>

struct InitFailed:public std::exception{
	InitFailed():std::exception("init Failed"){}
};

template<class T, class... Parms>
cocos2d::CCScene* createScene(Parms&&... p){

	CCScene * scene = NULL;
	// 'scene' is an autorelease object
	scene = CCScene::create();
	if(! scene)return nullptr;

	// 'layer' is an autorelease object
	T *layer = createWithInit<T>(std::forward<Parms>()...);
	if(! layer)return nullptr;

	// add layer as a child to scene
	scene->addChild(layer);
	// return the scene
	return scene;
	
};

template<class T,class... Parms>
T* createWithInit(Parms&&... p) 
{
	T *pRet = nullptr;
	try{
		pRet = new T(std::forward<Parms>(p)...);
		if (pRet && pRet->init()) 
		{ 
			pRet->autorelease(); 
			return pRet; 
		} 
		else 
		{ 
			delete pRet;
			return nullptr; 
		} 
	}
	catch(const std::bad_alloc&){
		return nullptr;
	}
	catch(const InitFailed&){
		delete pRet;
		return nullptr;
	}
}



template<class T>
struct BaseWithCocosInit:public T{
	BaseWithCocosInit(){
		initSucceeded_ = T::init();
		if(!initSucceeded_){
			throw InitFailed();
		}
	}
	bool init(){return initSucceeded_;}// Do nothing

	bool initSucceeded_;

};

#endif