模版获取多层次节点(使用不定参数)

template<class T>
void gFindChildByTags(CCNode* pRoot, T& tar, ...)
{
    CCNode* pRet = pRoot;
    int tag = 0;
    va_list arg;
    va_start(arg, tar);
    while ((tag = va_arg(arg, int)) > 0 && pRet)
    {
        pRet = pRet->getChildByTag(tag);
    }
    va_end(arg);
    if (pRet != pRoot)
        tar = (T)pRet;
    else
        tar = 0;
}