__VA_ARGS__

http://blackdire.i.sohu.com/blog/view/159994142.htm

http://www.cnblogs.com/zhujudah/archive/2012/03/22/2411240.html

http://blog.sina.com.cn/s/blog_661314940100qmfg.html

http://hi.baidu.com/syjfd/item/d8ec2df18e070615d6ff8cee