{"id":8638,"date":"2022-06-28T12:51:00","date_gmt":"2022-06-28T03:51:00","guid":{"rendered":"https:\/\/taki-lab.site\/bocci\/?p=8638"},"modified":"2022-06-26T12:54:44","modified_gmt":"2022-06-26T03:54:44","slug":"rust%e5%8b%89%e5%bc%b7%e4%b8%ad%e3%80%816-26%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=8638","title":{"rendered":"RUST\u52c9\u5f37\u4e2d\u30016\/26\u306e\u7a4d\u307f\u4e0a\u3052"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u524d\u56de\u306e\u7d9a\u304d<\/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=\"9PBqKlcEu8\"><a 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\"samplecli\"\r\nversion = \"0.1.0\"\r\nedition = \"2021\"\r\n\r\n# See more keys and their definitions at https:\/\/doc.rust-lang.org\/cargo\/reference\/manifest.html\r\n\r\n&#91;dependencies]\r\nclap = { version = \"3.1.6\", features = &#91;\"derive\"] }\r\nanyhow = { version = \"1.0\" }\r\nthiserror = { version = \"1.0\" }\r\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>use thiserror::Error;\r\n\r\n#&#91;derive(Error, Debug)]\r\nenum MyError {\r\n    #&#91;error(\"failed to read string from {0}\")]\r\n    ReadError(String),\r\n    #&#91;error(transparent)]\r\n    ParseError(#&#91;from] std::num::ParseIntError),\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 = \r\n        std::fs::read_to_string(path).map_err(|_| MyError::ReadError(path.into()))?;\r\n\r\n    num_str\r\n        .trim()\r\n        .parse::&lt;i32>()\r\n        .map(|t| t * 2)\r\n        .map_err(MyError::from)\r\n}\r\n\r\nfn main() {\r\n    match get_int_from_file() {\r\n        Ok(x) => println!(\"{}\", x),\r\n        Err(e) => println!(\"{:#}\", e),\r\n    }\r\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u524d\u56de\u306e\u7d9a\u304d 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