{"id":45720,"date":"2023-05-02T19:29:07","date_gmt":"2022-12-11T17:11:35","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45720-2\/"},"modified":"2024-04-30T02:18:39","modified_gmt":"2024-04-29T18:18:39","slug":"45720-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45720-2\/","title":{"rendered":""},"content":{"rendered":"

\u30b3\u30ed\u30ca\u30a6\u30a3\u30eb\u30b9\u9a12\u52d5\u306b\u3088\u3063\u3066\u5165\u624b\u4e0d\u53ef\u80fd\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u304c\u305d\u306e\u30de\u30b9\u30af\u306e\u8a71\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002
\n\u82b1\u7c89\u304c\u6fc0\u5316\u3059\u308b\uff13\u6708\u3092\u3069\u3046\u4e57\u308a\u8d8a\u3048\u305f\u3089\u3044\u3044\u306e\u304b\u2026<\/p>\n

\u30de\u30b9\u30af\u3063\u3066\u3069\u3093\u306a\u51e6\u7406\uff1f<\/h2>\n

\u3053\u3053\u3067\u6b32\u3057\u3044\u306e\u306f\u3053\u3093\u306a\u51e6\u7406\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n

let<\/span> key<\/span> =<\/span> SecretKey<\/span>::<\/span>new<\/span>(<\/span>\"wJalrXUtnFEMI\/K7MDENG+bPxRfiCYEXAMPLEKEY\"<\/span>);<\/span>\r\nprintln<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> key<\/span>);<\/span>\/\/ SecretKey(\"****************EKEY\")<\/span>\r\n<\/code><\/pre>\n
\u3069\u3046\u3057\u3066\uff1f<\/h2>\n
\u3053\u3093\u306a\u30b3\u30fc\u30c9\u3092\u898b\u308b\u3068\u30ae\u30e7\u30c3\u3068\u3057\u307e\u3059\u3088\u306d\u3002\u3057\u306a\u3051\u308c\u3070\u4eca\u304b\u3089\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
\r\n#[derive(Debug)]<\/span>\r\npub<\/span> struct<\/span> User<\/span> {<\/span>\r\n    name<\/span>:<\/span> String<\/span>,<\/span>\r\n    credentials<\/span>:<\/span> Credentials<\/span>,<\/span>\r\n}<\/span>\r\n#[derive(Debug)]<\/span>\r\npub<\/span> struct<\/span> Credentials<\/span> {<\/span>\r\n    pub<\/span> access_key<\/span>:<\/span> AccessKey<\/span>,<\/span>\r\n    pub<\/span> secret_key<\/span>:<\/span> SecretKey<\/span>,<\/span>\r\n}<\/span>\r\n#[derive(Debug)]<\/span>\r\npub<\/span> struct<\/span> AccessKey<\/span>(<\/span>String<\/span>);<\/span>\r\n\r\n#[derive(Debug)]<\/span>\/\/ \u30ae\u30e7\u30c3\u3068\u3059\u308b\u306e\u306f\u3053\u3053\uff01<\/span>\r\npub<\/span> struct<\/span> SecretKey<\/span>(<\/span>String<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u306a\u305c\u30ae\u30e7\u30c3\u3068\u3059\u308b\u306e\u304b\u3068\u3044\u3046\u3068 :<\/p>\n
let<\/span> taro<\/span> =<\/span> User<\/span> {<\/span>\r\n    name<\/span>:<\/span> \"\u592a\u90ce\"<\/span>.to_string<\/span>(),<\/span>\r\n    credentials<\/span>:<\/span> Credentials<\/span> {<\/span>\r\n        access_key<\/span>:<\/span> AccessKey<\/span>(<\/span>\"access-key\"<\/span>.to_string<\/span>()),<\/span>\r\n        secret_key<\/span>:<\/span> SecretKey<\/span>(<\/span>\"secret-key\"<\/span>.to_string<\/span>()),<\/span>\r\n    }<\/span>\r\n};<\/span>\r\n\/\/ \u3069\u3053\u304b\u3067\u4f5c\u3089\u308c\u305f\u30e6\u30fc\u30b6\u60c5\u5831\u3092\u30ed\u30b0\u306b\u51fa\u529b\u3057\u3066\u3044\u305f\u3089\u2026<\/span>\r\nprintln!<\/span>(<\/span>\"log: {:#?}\"<\/span>,<\/span> taro<\/span>);<\/span>\r\n\/*\r\nlog: User {\r\n    name: \"\u592a\u90ce\",\r\n    credentials: Credentials {\r\n        access_key: AccessKey(\r\n            \"access-key\",\r\n        ),\r\n        secret_key: SecretKey(\r\n            \/\/ \u305d\u306e\u30e1\u30f3\u30d0\u306e\u69cb\u9020\u4f53\u306b\u542b\u307e\u308c\u308b\u79d8\u533f\u60c5\u5831\u307e\u3067\u5410\u304b\u308c\u3066\u3044\u305f\u2026\uff01\r\n            \"secret-key\",\r\n        ),\r\n    },\r\n}\r\n*\/<\/span>\r\n<\/code><\/pre>\n
\u3042\u308b\u3042\u308b\u3067\u3059\u306d\u3002<\/p>\n
\u3069\u3046\u3059\u308c\u3070\uff1f<\/h2>\n
    \n
  • \n
      \u96d1\u306b\u30ed\u30b0\u306b\u51fa\u3055\u306a\u3051\u308c\u3070\u6e08\u3080\uff1f<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \n
      • \n
          \u79d8\u533f\u60c5\u5831\u3092\u30c0\u30f3\u30d7\u3057\u306a\u3044\u3088\u3046\u306b\u6ce8\u610f\u3059\u308b\uff1f<\/ul>\n<\/li>\n<\/ul>\n
          User \u3084 Credentials \u3067\u306f derive(Debug) \u3092\u907f\u3051\u308b\uff1f<\/p>\n
          \u3044\u305a\u308c\u306e\u7b54\u3048\u3082 No \u3067\u3059\u3002\u4eba\u9593\u306f\u30df\u30b9\u3092\u3057\u307e\u3059\u3002
          \n\u305d\u3082\u305d\u3082\u30ed\u30b0\u306b\u51fa\u529b\u3055\u308c\u3066\u3082\u554f\u984c\u304c\u8d77\u304d\u306a\u3044\u3088\u3046\u306b\u4f5c\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n
          \uff08\u30ed\u30b0\u306b\u51fa\u529b \u3067\u304d\u306a\u3044\u3088\u3046\u306b \u4f5c\u308b\u3068\u3044\u3046\u9078\u629e\u80a2\u3082\u3042\u308a\u305d\u3046\u3067\u3059\u304c\u3001\u3044\u308d\u3044\u308d\u3068\u5927\u5909\u306a\u306e\u3067\u4eca\u56de\u306f\u305d\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u306b\u306f\u89e6\u308c\u307e\u305b\u3093\uff09<\/p>\n
          \u5177\u4f53\u7684\u306a\u5b9f\u88c5\u4f8b<\/h2>\n
          \u3068\u3044\u3046\u3053\u3068\u3067\u89e3\u7b54\u7de8\u306b\u5165\u308b\u3068 :<\/p>\n
            \n
          • \n
              \u5b9f\u88c5\u3059\u3079\u304d\u306f\u79d8\u533f\u60c5\u5831 (\u3053\u3053\u3067\u306f SecretKey ) \u306e fmt::Debug \u306e\u307f<\/ul>\n<\/li>\n<\/ul>\n
               <\/p>\n
                \u305d\u306e\u4ed6\u306e derive(Debug) \u306b\u3064\u3044\u3066\u306f\u624b\u3092\u52a0\u3048\u308b\u5fc5\u8981\u306a\u3057<\/ul>\n
                \u3067\u3059\u3002<\/p>\n
                use<\/span> std<\/span>::<\/span>fmt<\/span>;<\/span>\r\n\r\n\/\/ \u3053\u308c\u306f\u3082\u3046\u4e0d\u8981<\/span>\r\n\/\/ #[derive(Debug)]<\/span>\r\npub<\/span> struct<\/span> SecretKey<\/span>(<\/span>String<\/span>);<\/span>\r\n\r\nimpl<\/span> fmt<\/span>::<\/span>Debug<\/span> for<\/span> SecretKey<\/span> {<\/span>\r\n    fn<\/span> fmt<\/span>(<\/span>&<\/span>self<\/span>,<\/span> f<\/span>:<\/span> &<\/span>mut<\/span> fmt<\/span>::<\/span>Formatter<\/span>)<\/span> -><\/span> Result<\/span><<\/span>(),<\/span> fmt<\/span>::<\/span>Error<\/span>><\/span> {<\/span>\r\n        let<\/span> visible_length<\/span> =<\/span> 4<\/span>;<\/span>\r\n        let<\/span> masked<\/span> =<\/span> {<\/span>\r\n            let<\/span> start<\/span> =<\/span> self<\/span>.0<\/span>.len<\/span>()<\/span> -<\/span> visible_length<\/span>;<\/span>\r\n            format!<\/span>(<\/span>\"{:*>20}\"<\/span>,<\/span> &<\/span>self<\/span>.0<\/span>[<\/span>start<\/span>..<\/span>])<\/span>\r\n        };<\/span>\r\n        f<\/span>.debug_tuple<\/span>(<\/span>\"SecretKey\"<\/span>)<\/span>.field<\/span>(<\/span>&<\/span>masked<\/span>)<\/span>.finish<\/span>()<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                \u52d5\u4f5c\u304c\u3069\u306e\u3088\u3046\u306b\u5909\u308f\u3063\u305f\u306e\u304b\u898b\u3066\u307f\u307e\u3057\u3087\u3046 :<\/p>\n
                let<\/span> taro<\/span> =<\/span> User<\/span> {<\/span>\r\n    name<\/span>:<\/span> \"\u592a\u90ce\"<\/span>.to_string<\/span>(),<\/span>\r\n    credentials<\/span>:<\/span> Credentials<\/span> {<\/span>\r\n        access_key<\/span>:<\/span> AccessKey<\/span>(<\/span>\"access-key\"<\/span>.to_string<\/span>()),<\/span>\r\n        secret_key<\/span>:<\/span> SecretKey<\/span>(<\/span>\"secret-key\"<\/span>.to_string<\/span>()),<\/span>\r\n    }<\/span>\r\n};<\/span>\r\nprintln!<\/span>(<\/span>\"log: {:#?}\"<\/span>,<\/span> taro<\/span>);<\/span>\r\n\/*\r\nlog: User {\r\n    name: \"\u592a\u90ce\",\r\n    credentials: Credentials {\r\n        access_key: AccessKey(\r\n            \"access-key\",\r\n        ),\r\n        \/\/ \u96d1\u306b\u30c0\u30f3\u30d7\u3057\u3066\u3082\u8aad\u3081\u306a\u304f\u306a\u3063\u305f\uff01\u5b89\u5fc3\uff01\r\n        secret_key: SecretKey(\r\n            \"****************-key\",\r\n        ),\r\n    },\r\n}\r\n*\/<\/span>\r\n<\/code><\/pre>\n
                \u554f\u984c\u306a\u3055\u305d\u3046\u3067\u3059\u306d\u3002
                \n\u305b\u3063\u304b\u304f\u306a\u306e\u3067\u7c21\u5358\u306a\u30c6\u30b9\u30c8\u3082\u6b8b\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n
                #[cfg(test)]<\/span>\r\nmod<\/span> tests<\/span> {<\/span>\r\n    use<\/span> super<\/span>::<\/span>SecretKey<\/span>;<\/span>\r\n\r\n    #[test]<\/span>\r\n    fn<\/span> it_should_be_masked<\/span>()<\/span> {<\/span>\r\n        let<\/span> key<\/span> =<\/span> SecretKey<\/span>(<\/span>\"wJalrXUtnFEMI\/K7MDENG+bPxRfiCYEXAMPLEKEY\"<\/span>.to_string<\/span>());<\/span>\r\n        let<\/span> masked<\/span> =<\/span> format!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> key<\/span>);<\/span>\r\n\r\n        assert_eq!<\/span>(<\/span>masked<\/span>,<\/span> r#\"SecretKey(\"****************EKEY\")\"#<\/span>);<\/span>\r\n        assert_eq!<\/span>(<\/span>masked<\/span>.len<\/span>(),<\/span> 20<\/span> +<\/span> r#\"SecretKey(\"\")\"#<\/span>.len<\/span>());<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                \u3061\u306a\u307f\u306b\u6700\u5f8c\u306e\u56db\u6587\u5b57\u3060\u3051\u898b\u305b\u308b\u3068\u3044\u3046\u6319\u52d5\u306f AWS CLI \u306e\u305d\u308c\u3092 \u30d1\u30af\u308a \u53c2\u8003\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n
                \u8ffd\u8a18 : \u30de\u30eb\u30c1\u30d0\u30a4\u30c8\u6587\u5b57\u304c\u542b\u307e\u308c\u308b\u3068\u2026<\/h3>\n
                \u3053\u3053\u307e\u3067\u66f8\u3044\u3066\u304b\u3089\u3001\u65e5\u672c\u8a9e\u304c\u5165\u308b\u3068 panic \u3067\u843d\u3061\u308b\u3053\u3068\u306b\u6c17\u304c\u4ed8\u304d\u307e\u3057\u305f<\/p>\n
                    #[<\/span>test<\/span>]<\/span>\r\n    fn<\/span> it_should_be_masked_even_if_multibyte_given<\/span>()<\/span> {<\/span>\r\n        let<\/span> key<\/span> =<\/span> SecretKey<\/span>(<\/span>\"wJalrXUtnFEMI\/K7MDENG+bPxRfiCYEXAM\u9014\u4e2d\u306b\u65e5\u672c\u8a9e\"<\/span>.<\/span>to_string<\/span>());<\/span>\r\n        let<\/span> masked<\/span> =<\/span> format<\/span>!(<\/span>\"{:?}\"<\/span>,<\/span> key<\/span>);<\/span>\r\n\r\n        assert_eq<\/span>!(<\/span>masked<\/span>,<\/span> r<\/span>#<\/span>\"SecretKey(\"<\/span>****************<\/span>\u306b\u65e5\u672c\u8a9e<\/span>\")\"<\/span>#);<\/span>\r\n        assert_eq<\/span>!(<\/span>masked<\/span>.<\/span>chars<\/span>().<\/span>count<\/span>(),<\/span> 20<\/span> +<\/span> r<\/span>#<\/span>\"SecretKey(\"\")\"<\/span>#.<\/span>len<\/span>());<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
                oops!<\/p>\n
                thread '...secret_key::tests::it_should_be_masked_even_if_multibyte_given'\r\n  panicked at 'byte index 48 is not a char boundary;\r\n    it is inside '\u672c' (bytes 46..49) of `wJalrXUtnFEMI\/K7MDENG+bPxRfiCYEXAM\u9014\u4e2d\u306b\u65e5\u672c\u8a9e`',\r\n      src\/libcore\/str\/mod.rs:2068\r\n\r\ntest ...secret_key::tests::it_should_be_masked_even_if_multibyte_given ... FAILED\r\n<\/code><\/pre>\n
                \u3053\u306e\u30c6\u30b9\u30c8\u3092\u901a\u3059\u305f\u3081\u306e\u4fee\u6b63\u7248\u306f\u3053\u3061\u3089 :<\/p>\n
                impl<\/span> fmt<\/span>::<\/span>Debug<\/span> for<\/span> SecretKey<\/span> {<\/span>\r\n    fn<\/span> fmt<\/span>(&<\/span>self<\/span>,<\/span> f<\/span>:<\/span> &mut<\/span> fmt::Formatter<\/span>)<\/span> -><\/span> Result<\/span><(),<\/span> fmt<\/span>::<\/span>Error<\/span>><\/span> {<\/span>\r\n        let<\/span> visible_length<\/span> =<\/span> 4<\/span>;<\/span>\r\n        let<\/span> masked<\/span> =<\/span> {<\/span>\r\n            let<\/span> length<\/span> =<\/span> self<\/span>.<\/span>0.<\/span>chars<\/span>().<\/span>count<\/span>();<\/span>\r\n            let<\/span> start<\/span> =<\/span> length<\/span> -<\/span> visible_length<\/span>;<\/span>\r\n            let<\/span> extracted<\/span>:<\/span> String<\/span> =<\/span> self<\/span>.<\/span>0.<\/span>chars<\/span>().<\/span>skip<\/span>(<\/span>start<\/span>).<\/span>collect<\/span>();<\/span>\r\n            format<\/span>!(<\/span>\"{:*>20}\"<\/span>,<\/span> &<\/span>extracted<\/span>)<\/span>\r\n        };<\/span>\r\n        f<\/span>.<\/span>debug_tuple<\/span>(<\/span>\"SecretKey\"<\/span>).<\/span>field<\/span>(&<\/span>masked<\/span>).<\/span>finish<\/span>()<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                \u521d\u671f\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u4f7f\u3048\u308b\u306e\u306f\u30de\u30eb\u30c1\u30d0\u30a4\u30c8\u6587\u5b57\u304c\u7d76\u5bfe\u306b\u6765\u306a\u3044\u3068\u8a00\u3048\u308b\u5834\u9762\u3060\u3051\u306b\u306a\u308a\u305d\u3046\u3067\u3059\u306d\u2026<\/p>\n
                \u4f59\u8ac7 : \u30b3\u30fc\u30c9\u306e\u8a73\u7d30\u306b\u3064\u3044\u3066<\/h2>\n
                \u4e0a\u8a18\u306e\u5b9f\u88c5\u306f\u308f\u305a\u304b\u6570\u5341\u884c\u7a0b\u5ea6\u3067\u3059\u304c\u3001
                \n\u666e\u6bb5\u3042\u307e\u308a\u4f7f\u308f\u306a\u3044 & \u5730\u5473\u306b\u4fbf\u5229 & \u304a\u3082\u3057\u308d\u3044\u30dd\u30a4\u30f3\u30c8\u304c\u4f55\u70b9\u304b\u3042\u3063\u305f\u306e\u3067\u66f8\u304d\u6b8b\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n
                std::fmt::DebugTuple<\/h3>\n
                debug_tuple \u30e1\u30bd\u30c3\u30c9\u306b\u3088\u3063\u3066\u3044\u3044\u611f\u3058\u306e pretty-print \u304c\u624b\u306b\u5165\u308a\u307e\u3059\u3002
                \n\uff08\u8a18\u4e8b\u672c\u6587\u3067 SecretKey \u306e {:#?} \u51fa\u529b\u304c\u5b8c\u74a7\u306b\u30a4\u30f3\u30c7\u30f3\u30c8\u3055\u308c\u3066\u3044\u305f\u3053\u3068\u306b\u7740\u76ee\u3057\u3066\u304f\u3060\u3055\u3044\uff01\uff09<\/p>\n
                log<\/span>:<\/span> User<\/span> {<\/span>\r\n    name<\/span>:<\/span> \"\u592a\u90ce\"<\/span>,<\/span>\r\n    credentials<\/span>:<\/span> Credentials<\/span> {<\/span>\r\n        access_key<\/span>:<\/span> AccessKey<\/span>(<\/span>\r\n            \"access-key\"<\/span>,<\/span>\r\n        ),<\/span>\r\n        secret_key<\/span>:<\/span> SecretKey<\/span>(<\/span>\r\n            \"****************-key\"<\/span>,<\/span>\r\n        ),<\/span>\r\n<\/code><\/pre>\n
                \u53c2\u8003\u30ea\u30f3\u30af<\/p>\n
                  \n
                • \n
                    std::fmt::DebugTuple – Rust<\/ul>\n<\/li>\n<\/ul>\n
                     <\/p>\n
                      \n
                    • \n
                        rust – Is there a way to customize Debug output without implementing the Debug trait directly? – Stack Overflow<\/ul>\n<\/li>\n<\/ul>\n
                        std::fmt::Formatter – Rust<\/p>\n
                        tuple \u4ee5\u5916\u306b\u3082 struct, list, set, map \u7528\u306e\u95a2\u6570\u304c\u63c3\u3063\u3066\u307e\u3059\u3002\u5730\u5473\u306b\u30b9\u30c6\u30ad\u3002<\/p>\n
                        Fill\/Alignment<\/h3>\n
                        “{:*>20}” \u3067 “20 \u6587\u5b57\u306b\u9054\u3059\u308b\u307e\u3067\u5de6\u5074\u3092 * \u3067\u57cb\u3081\u308b” \u306e\u610f\u3067\u3059\u3002
                        \n\u6587\u5b57\u3092 * \u4ee5\u5916\u306b\u5909\u3048\u308b\u306e\u306f\u3082\u3061\u308d\u3093\u3001\u53f3\u5074\u3092\u57cb\u3081\u305f\u308a\u5de6\u53f3\u3092\u57cb\u3081\u305f\u308a\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
                          \n
                        • \n
                            \u6700\u521d\u306f\u3053\u308c\u3092\u77e5\u3089\u305a\u306b\u5371\u3046\u304f\u6b63\u898f\u8868\u73fe (rf. regex crate) \u3067\u30b4\u30ea\u62bc\u3057\u3059\u308b\u3068\u3053\u308d\u3067\u3057\u305f<\/ul>\n<\/li>\n<\/ul>\n
                             <\/p>\n
                              \u53c2\u8003 : std::fmt – Rust<\/ul>\n
                              Raw string literals<\/h3>\n
                              r#”…”# \u306e\u8a18\u6cd5\u306b\u3088\u3063\u3066 ” \u3084 \\ \u3092\u624b\u4f5c\u696d\u3067\u30a8\u30b9\u30b1\u30fc\u30d7\u3059\u308b\u7c21\u5358\u306a\u304a\u4ed5\u4e8b\u304b\u3089\u89e3\u653e\u3055\u308c\u307e\u3059\u3002
                              \n\u30ea\u30c6\u30e9\u30eb\u306e\u4e2d\u306b # \u3092\u5165\u308c\u305f\u3044\u3068\u304d\u306f r##”…”## \u3067\u3059\u3002<\/p>\n
                                \n
                              • \n
                                  Go \u306e\u30d0\u30c3\u30af\u30af\u30a9\u30fc\u30c8\u3084 Scala \u306e “”” \u306b\u3042\u305f\u308b\u3084\u3064\u3067\u3059<\/ul>\n<\/li>\n<\/ul>\n
                                   <\/p>\n
                                    \u53c2\u8003 : Tokens – The Rust Reference<\/ul>\n
                                    String Slices<\/h3>\n
                                    foo[start..] \u3067 “start \u30d0\u30a4\u30c8\u4ee5\u964d\u3092\u5207\u308a\u51fa\u3059” \u306e\u610f\u3067\u3059\u3002
                                    \n\u6dfb\u5b57\u306b\u306f\u7bc4\u56f2\u3092\u6307\u5b9a\u3067\u304d\u308b\u306e\u3067 foo[start..end] \u3084 foo[..end] \u3082\u66f8\u3051\u307e\u3059\u3002<\/p>\n
                                      \u53c2\u8003 : The Slice Type – The Rust Programming Language<\/ul>\n
                                      \u3061\u306a\u307f\u306b\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u3088\u304f\u898b\u305f\u3089\u30de\u30eb\u30c1\u30d0\u30a4\u30c8\u6587\u5b57\u306e\u6271\u3044\u306b\u3064\u3044\u3066\u3082\u660e\u8a18\u3055\u308c\u3066\u3044\u307e\u3057\u305f<\/p>\n
                                      Note: String slice range indices must occur at valid UTF-8 character boundaries. If you attempt to create a string slice in the middle of a multibyte character, your program will exit with an error.<\/p><\/blockquote>\n
                                      std::str::Chars<\/h3>\n
                                      .chars().count() \u306b\u3088\u3063\u3066\u30de\u30eb\u30c1\u30d0\u30a4\u30c8\u6587\u5b57\u306e\u300c\u6587\u5b57\u6570\u300d\u3092\u5f97\u3089\u308c\u307e\u3059\u3002
                                      \n\u306e\u306f\u305a\u3060\u3063\u305f\u3093\u3067\u3059\u304c\u3001\u8abf\u67fb\u306e\u904e\u7a0b\u3067\u77e5\u3063\u305f\u3053\u308f\u304a\u3082\u3057\u308d\u3044\u4f8b\u3092\u7d39\u4ecb\u3057\u3066\u304a\u304d\u307e\u3059 :<\/p>\n
                                        https:\/\/play.rust-lang.org\/?version=stable&mode=debug&edition=2015&gist=9480b9d3af4bea29ccadbd25a586dea7<\/ul>\n
                                        String: 'e\u0301' has length 3 and character count 2\r\nString: '\u00e9' has length 2 and character count 1\r\n<\/code><\/pre>\n
                                        \u3053\u306e e \u306e\u982d\u306b\u3064\u3044\u3066\u3044\u308b\u8a18\u53f7\u306f grapheme (\u66f8\u8a18\u7d20) \u306a\u308b\u3082\u306e\u3067\u3001\u5225\u9014\u30e9\u30a4\u30d6\u30e9\u30ea :<\/p>\n
                                          unicode-segmentation – crates.io: Rust Package Registry<\/ul>\n
                                          \u3092\u4f7f\u3048\u3070\u3053\u306e grapheme \u3092\u8003\u616e\u3057\u3066\u6587\u5b57\u6570\u3092\u30ab\u30a6\u30f3\u30c8\u3067\u304d\u308b\u3088\u3046\u3067\u3059\u3002
                                          \n\u4eca\u56de\u306e\u8a18\u4e8b\u3067\u306f<\/p>\n
                                            \n
                                          • \n
                                              \u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u7bc4\u56f2\u5916<\/ul>\n<\/li>\n<\/ul>\n
                                               <\/p>\n
                                                \n
                                              • \n
                                                  \u3069\u3053\u307e\u3067\u5b9f\u88c5\u3059\u3079\u304d\u306a\u306e\u304b\u306f\u304a\u305d\u3089\u304f\u8981\u4ef6\u306b\u3088\u308b<\/ul>\n<\/li>\n<\/ul>\n
                                                   <\/p>\n
                                                    \u691c\u8a3c\u304c\u3081\u3093\u3069\u3044<\/ul>\n
                                                    \u3068\u3044\u3046\u70b9\u304b\u3089\u5bfe\u5fdc\u3092\u898b\u9001\u308a\u307e\u3057\u305f\u3002<\/p>\n
                                                    \u53c2\u8003\u30ea\u30f3\u30af<\/p>\n
                                                      \n
                                                    • \n
                                                        Get the String length in characters in Rust – Stack Overflow<\/ul>\n<\/li>\n<\/ul>\n
                                                         <\/p>\n
                                                          unicode – How do I count unique grapheme clusters in a string in Rust? – Stack Overflow<\/ul>\n","protected":false},"excerpt":{"rendered":"
                                                          \u30b3\u30ed\u30ca\u30a6\u30a3\u30eb\u30b9\u9a12\u52d5\u306b\u3088\u3063\u3066\u5165\u624b\u4e0d\u53ef\u80fd\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u304c\u305d\u306e\u30de\u30b9\u30af\u306e\u8a71\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002 \u82b1\u7c89\u304c\u6fc0\u5316\u3059\u308b\uff13\u6708\u3092\u3069\u3046\u4e57 […]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45720","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n- Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/45720-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"\u30b3\u30ed\u30ca\u30a6\u30a3\u30eb\u30b9\u9a12\u52d5\u306b\u3088\u3063\u3066\u5165\u624b\u4e0d\u53ef\u80fd\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u304c\u305d\u306e\u30de\u30b9\u30af\u306e\u8a71\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002 \u82b1\u7c89\u304c\u6fc0\u5316\u3059\u308b\uff13\u6708\u3092\u3069\u3046\u4e57 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45720-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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