[{"data":1,"prerenderedAt":232},["ShallowReactive",2],{"archive-2024-6-1":3},{"title":4,"articles":5,"hot_article":17,"month_arch":80,"total":228,"cover":229},"2024年6月 - 独孤影的博客",[6],{"id":7,"title":8,"uri":9,"author":10,"tags":11,"created_at":14,"view_count":15,"content":16},120,"初学rust，trait的一些使用限制","rust-some-limit-for-trait","duguying",[12,13],"rust","trait","2024-06-12 16:08:51",187,"\u003Cp>rust中，trait相当于其他语言中的接口。例如json序列化，需要实现\u003Ccode class=\"inline-code\">Serialize\u003C\u002Fcode>这个trait，但是，这里存在如下三个限制：\u003C\u002Fp>\n\n\u003Col>\n\u003Cli>要实现的 trait 和类型都在当前 crate 中定义。\u003C\u002Fli>\n\u003Cli>要实现的 trait 在当前 crate 中定义，而类型在外部 crate 中定义。\u003C\u002Fli>\n\u003Cli>要实现的类型在当前 crate 中定义，而 trait 在外部 crate 中定义。\u003C\u002Fli>\n\u003C\u002Fol>\n\n\u003Cp>也就是说，你想要对一个结构体去实现某个trait，要么，这个结构体是你的（也就是在你当前crate包中），要么，这个trait是你定义的，两者至少有一个是你自己的，你才能对这个结构体实现这个指定的trait。\u003C\u002Fp>\n\n\u003Cp>如果，trait和结构体都不是你实现的，你将无法为这个外部结构体实现外部trait。例如，我想为TcpStream实现Serialize，直接写，会报错\u003C\u002Fp>\n\n\u003Cp>\u003Cimg src=\"https:\u002F\u002Fimage.duguying.net\u002F2024\u002F06\u002Fsfgdut7l.webp\" alt=\"sfgdut7l\" \u002F>\u003C\u002Fp>\n\n\u003Cpre style=\"color:#e6edf3;background-color:#0d1117;white-space:pre-wrap;word-break:break-word;\">\u003Ccode>\u003Cspan style=\"display:flex;\">\u003Cspan>\u003Cspan style=\"color:#f85149\">`\u003C\u002Fspan>mio::net::TcpStream\u003Cspan style=\"color:#f85149\">`\u003C\u002Fspan>\u003Cspan style=\"color:#6e7681\"> \u003C\u002Fspan>is\u003Cspan style=\"color:#6e7681\"> \u003C\u002Fspan>not\u003Cspan style=\"color:#6e7681\"> \u003C\u002Fspan>defined\u003Cspan style=\"color:#6e7681\"> \u003C\u002Fspan>\u003Cspan style=\"color:#ff7b72\">in\u003C\u002Fspan>\u003Cspan style=\"color:#6e7681\"> \u003C\u002Fspan>the\u003Cspan style=\"color:#6e7681\"> \u003C\u002Fspan>current\u003Cspan style=\"color:#6e7681\"> \u003C\u002Fspan>craterustcE0117\u003Cspan style=\"color:#6e7681\">\n\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>\u003Cspan style=\"color:#6e7681\">\u003C\u002Fspan>main.rs(\u003Cspan style=\"color:#a5d6ff\">24\u003C\u002Fspan>,\u003Cspan style=\"color:#6e7681\"> \u003C\u002Fspan>\u003Cspan style=\"color:#a5d6ff\">1\u003C\u002Fspan>): \u003Cspan style=\"color:#f0883e;font-weight:bold\">original\u003C\u002Fspan>\u003Cspan style=\"color:#6e7681\"> \u003C\u002Fspan>diagnostic\u003Cspan style=\"color:#6e7681\">\n\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fpre>\n\n\u003Cp>只能通过包裹TcpStream来实现了，总之，为外部结构体实现外部trait就是行不通。\u003C\u002Fp>\n",{"title":18,"list":19},"最热文章",[20,26,32,38,44,50,56,62,68,74],{"id":21,"title":22,"uri":23,"author":10,"created_at":24,"view_count":25},28,"docker容器目录与主机目录同步","\u002Farticle\u002Fdocker容器目录与主机目录同步","2014-12-31 12:34:08",15570,{"id":27,"title":28,"uri":29,"author":10,"created_at":30,"view_count":31},21,"beego中使用fis","\u002Farticle\u002Fbeego中使用fis","2014-12-03 10:47:56",9250,{"id":33,"title":34,"uri":35,"author":10,"created_at":36,"view_count":37},20,"用github登录，oauth开发","\u002Farticle\u002F用github登录，oauth开发","2014-11-23 13:33:37",9113,{"id":39,"title":40,"uri":41,"author":10,"created_at":42,"view_count":43},18,"windows服务注册工具nssm","\u002Farticle\u002Fwindows服务注册工具nssm","2014-10-31 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