{"id":8454,"date":"2022-05-29T13:06:00","date_gmt":"2022-05-29T04:06:00","guid":{"rendered":"https:\/\/taki-lab.site\/bocci\/?p=8454"},"modified":"2022-05-29T13:08:51","modified_gmt":"2022-05-29T04:08:51","slug":"rust%e5%8b%89%e5%bc%b7%e4%b8%ad%e3%80%815-29%e3%81%ae%e7%a9%8d%e3%81%bf%e4%b8%8a%e3%81%92","status":"publish","type":"post","link":"https:\/\/taki-lab.site\/bocci\/?p=8454","title":{"rendered":"RUST\u52c9\u5f37\u4e2d\u30015\/29\u306e\u7a4d\u307f\u4e0a\u3052"},"content":{"rendered":"\n<p>\u3042\u3001\u4eca\u65e5\u8089\u306e\u65e5\u3058\u3083\u3093\u3002<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-\u81ea\u5206\u3001\u307c\u3063\u3061\u3067\u3059\u304c\u4f55\u304b\uff1f wp-block-embed-\u81ea\u5206\u3001\u307c\u3063\u3061\u3067\u3059\u304c\u4f55\u304b\uff1f\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"I9h09wRN4X\"><a href=\"https:\/\/taki-lab.site\/bocci\/?p=8421\">RUST\u52c9\u5f37\u4e2d\u30015\/21\u306e\u7a4d\u307f\u4e0a\u3052<\/a><\/blockquote><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"&#8220;RUST\u52c9\u5f37\u4e2d\u30015\/21\u306e\u7a4d\u307f\u4e0a\u3052&#8221; &#8212; \u81ea\u5206\u3001\u307c\u3063\u3061\u3067\u3059\u304c\u4f55\u304b\uff1f\" src=\"https:\/\/taki-lab.site\/bocci\/?p=8421&#038;embed=true#?secret=SBjKxD6ALp#?secret=I9h09wRN4X\" data-secret=\"I9h09wRN4X\" width=\"474\" height=\"267\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>use std::fmt;\r\n\r\nenum MyError {\r\n    Io(std::io::Error),\r\n    Num(std::num::ParseIntError),\r\n}\r\n\r\nimpl fmt::Display for MyError {\r\n    fn fmt(&amp;self, f: &amp;mut fmt::Formatter&lt;'_>) -> fmt::Result {\r\n        match self {\r\n            MyError::Io(cause) => write!(f, \"I\/O Error: {}\", cause),\r\n            MyError::Num(cause) => write!(f, \"Parse Error: {}\", cause),\r\n        }\r\n    }\r\n}\r\n\r\nfn get_int_from_file() -> Result&lt;i32, MyError> {\r\n    let path = \"number.txt\";\r\n\r\n    let num_str = std::fs::read_to_string(path).map_err(|e| MyError::Io(e))?;\r\n\r\n    num_str\r\n        .trim()\r\n        .parse::&lt;i32>()\r\n        .map(|t| t * 2)\r\n        .map_err(|e| MyError::Num(e))\r\n}\r\n\r\nfn main() {\r\n    match get_int_from_file() {\r\n        Ok(x) => println!(\"{}\", x),\r\n        Err(e) => match e {\r\n            MyError::Io(cause) => println!(\"I\/O Error: {}\", cause),\r\n            MyError::Num(cause) => println!(\"Parse Error: {}\", cause),\r\n        }\r\n    }\r\n}\r\n\n<\/code><\/pre>\n\n\n\n<p>MyError\u3068\u3044\u3046\u72ec\u81ea\u30a8\u30e9\u30fc\u5b9a\u7fa9\u3092\u4f7f\u7528\u3057\u305f\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3082\u3046\u3053\u3053\u307e\u3067\u6765\u308b\u3068\u5185\u5bb9\u304c\u7406\u89e3\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3042\u3001\u4eca\u65e5\u8089\u306e\u65e5\u3058\u3083\u3093\u3002 MyError\u3068\u3044\u3046\u72ec\u81ea\u30a8\u30e9\u30fc\u5b9a\u7fa9\u3092\u4f7f\u7528\u3057\u305f\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002 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