一个简单的RTTI实现
http://blog.csdn.net/markl22222/article/details/5308167
http://blog.csdn.net/markl22222/article/details/5308167
http://blog.csdn.net/markl22222/article/details/5308167
http://blog.csdn.net/markl22222/article/details/5308167
