zgrztzy的博客

https://blog.youkuaiyun.com/sinat_22991367/article/details/104159739

转自：https://blog.youkuaiyun.com/xiaoc_fantasy/article/details/79570788 https://blog.youkuaiyun.com/weixin_40021744/article/details/88802969 1、向上转换 template<typename To, typename From> inline To implicit_c...