仿函数

http://www.cppblog.com/kevinlynx/archive/2008/03/17/44678.html

http://baike.baidu.com/link?url=x5m_944-dd6MAaw6VNv3ZqXvco9wp6_EZvy9l-ff8JJwW4njeiaLaYtcw4w5bcUYczeSGXtPbyLznIMePSy7s_

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原文地址：https://www.cnblogs.com/diyunpeng/p/3537607.html