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参考 c++prime chapter 4.11.3 强制类型转换（cast）参考http://blog.youkuaiyun.com/vincentlmeng/article/details/56673545参考http://blog.sina.com.cn/s/blog_4b20940201013ryp.html> 参考 c++prime强制类型转换的形式：cast-name<type>(expre

sizeof operatorQueries size of the object or type. Used when actual size of the object must be known.Syntaxsizeof( type ) (1) sizeof expression (2)Both versions return a constant of type std::size