{"id":45649,"date":"2023-03-10T10:10:14","date_gmt":"2023-05-09T00:52:34","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45649-2\/"},"modified":"2024-04-29T18:13:27","modified_gmt":"2024-04-29T10:13:27","slug":"45649-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45649-2\/","title":{"rendered":""},"content":{"rendered":"

Rust \u3067\u300c\u30d1\u30bf\u30fc\u30f3\u300d\u306b\u3064\u3044\u3066\u8abf\u3079\u308b\u3068\u304d match \u5f0f\u306b\u6ce8\u76ee\u3057\u304c\u3061\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u95a2\u6570\u7b49\u306e\u5f15\u6570\u3084 let \u5ba3\u8a00\u7b49\u3001\u5909\u6570\u675f\u7e1b (\u4ee3\u5165\u306e\u3088\u3046\u306a\u3082\u306e) \u3092\u3059\u308b\u3088\u3046\u306a\u5834\u6240\u3067\u3082\u4f7f\u3048\u307e\u3059\u3002
\n\u4ed6\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306b\u304a\u3051\u308b\u300c\u5206\u5272\u4ee3\u5165\u300d\u306b\u3042\u305f\u308b\u5909\u6570\u675f\u7e1b\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u672c\u8a18\u4e8b\u3067\u306f Rust \u306e\u300c\u30d1\u30bf\u30fc\u30f3\u300d\u306e\u4e2d\u3067\u3082\u300c\u975e\u69cb\u9020\u5316\u300d\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3059\u3002<\/p>\n

\u203b\u672c\u8a18\u4e8b\u3067\u306f “destructuring” \u3092\u300c\u975e\u69cb\u9020\u5316\u300d\u3068\u8a33\u3057\u3066\u3044\u307e\u3059\u304c\u3001Rust \u306e\u65e5\u672c\u8a9e\u7248\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3067\u306f\u300c\u5206\u89e3\u300d\u3084\u300c\u5206\u914d\u300d\u3068\u8a33\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n

1. \u300c\u30d1\u30bf\u30fc\u30f3\u300d\u306e\u6982\u8981<\/h1>\n

\u300c\u30d1\u30bf\u30fc\u30f3\u300d\u306f\u4ee5\u4e0b\u306e\u7b87\u6240\u3067\u5229\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n

let \u5ba3\u8a00
\n\u95a2\u6570\u307e\u305f\u306f\u30af\u30ed\u30fc\u30b8\u30e3\u306e\u5f15\u6570<\/p>\n

match \u5f0f<\/p>\n

if let \u5f0f<\/p>\n

while let \u5f0f<\/p>\n

for \u5f0f<\/p>\n

\u300c\u30d1\u30bf\u30fc\u30f3\u300d\u306e\u5f79\u5272\u306f\u4ee5\u4e0b\u306e 2 \u3064\u3067\u3059\u3002<\/p>\n

    \n
  1. \n
      \u300c\u5024\u306e\u69cb\u9020\u304c\u76ee\u7684\u306e\u69cb\u9020\u3068\u4e00\u81f4\u3059\u308b\u304b\u300d\u3092\u8abf\u3079\u305f\u3044\u3068\u304d\u3001\u305d\u306e\u300c\u76ee\u7684\u306e\u69cb\u9020\u300d\u3092\u8868\u73fe\u3059\u308b<\/ol>\n<\/li>\n<\/ol>\n

       <\/p>\n

        \u300c\u5024\u306e\u69cb\u9020\u304c\u76ee\u7684\u306e\u69cb\u9020\u3068\u4e00\u81f4\u3057\u305f\u300d\u3068\u304d\u3001\u305d\u306e\u300c\u69cb\u9020\u300d\u306b\u57fa\u3065\u3044\u3066\u5024\u3092\u975e\u69cb\u9020\u5316\u3057\u3001\u5909\u6570\u3092\u975e\u69cb\u9020\u5316\u3057\u305f\u5024\u306b\u675f\u7e1b\u3059\u308b (\u30aa\u30d7\u30b7\u30e7\u30f3\u306a\u5f79\u5272)<\/ol>\n

        \u53c2\u8003\u300cPatterns – The Rust Reference\u300d
        \n\u53c2\u8003\u300cPattern Syntax – The Rust Programming Language\u300d<\/p>\n

        2. \u975e\u69cb\u9020\u5316\u5909\u6570\u675f\u7e1b<\/h1>\n

        \u5909\u6570\u3092\u675f\u7e1b\u3059\u308b\u3053\u3068\u304b\u3089\u6700\u7d42\u7684\u306b\u300c\u8b58\u5225\u5b50\u30d1\u30bf\u30fc\u30f3\u300d\u3068\u3057\u3066\u89e3\u6790\u3055\u308c\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u305d\u3053\u307e\u3067\u89e3\u6790\u3055\u308c\u308b\u904e\u7a0b\u7b49\u3092\u307e\u3068\u3081\u307e\u3059\u3002<\/p>\n

        (\u300c\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9\u30d1\u30bf\u30fc\u30f3\u300d\u3084\u300c\u6b8b\u4f59\u30d1\u30bf\u30fc\u30f3\u300d\u3067\u5909\u6570\u675f\u7e1b\u3055\u308c\u306a\u3044\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002)<\/p>\n

        \u53c2\u8003\u300cIdentifier patterns – Patterns – The Rust Reference\u300d<\/p>\n

        2.1. \u300c\u53c2\u7167\u30d1\u30bf\u30fc\u30f3\u300d\u306b\u3088\u308b\u53c2\u7167\u5916\u3057<\/h2>\n

        \u300c\u53c2\u7167\u30d1\u30bf\u30fc\u30f3\u300d\u306b\u3088\u3063\u3066\u53c2\u7167\u5916\u3057\u3092\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

        let<\/span> foo<\/span> =<\/span> 23<\/span>;<\/span>\r\n\r\nlet<\/span> bar<\/span> =<\/span> &<\/span>foo<\/span>;<\/span> \/\/ \u501f\u7528 (\u5909\u6570 bar \u306f\u53c2\u7167\u578b)<\/span>\r\n\r\nlet<\/span> baz<\/span> =<\/span> *<\/span>bar<\/span>;<\/span> \/\/ \u53c2\u7167\u5916\u3057\u6f14\u7b97\u5b50 * \u306b\u3088\u308b\u53c2\u7167\u5916\u3057<\/span>\r\n\r\nlet<\/span> &<\/span>qux<\/span> =<\/span> bar<\/span>;<\/span> \/\/ \u53c2\u7167\u30d1\u30bf\u30fc\u30f3\u306b\u3088\u308b\u53c2\u7167\u5916\u3057<\/span>\r\n<\/code><\/pre>\n
        let<\/span> something<\/span> =<\/span> |<\/span>&<\/span>foo<\/span>|<\/span> {<\/span> \/\/ \u53c2\u7167\u30d1\u30bf\u30fc\u30f3\u306b\u3088\u308b\u53c2\u7167\u5916\u3057<\/span>\r\n    let<\/span> bar<\/span> =<\/span> String<\/span>::<\/span>from<\/span>(<\/span>foo<\/span>);<\/span>\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> bar<\/span>);<\/span>\r\n};<\/span>\r\n\r\nlet<\/span> baz<\/span> =<\/span> \"Baz\"<\/span>;<\/span>\r\n\r\nlet<\/span> qux<\/span> =<\/span> &<\/span>baz<\/span>;<\/span>\r\n\r\nsomething<\/span>(<\/span>qux<\/span>);<\/span>\r\n<\/code><\/pre>\n
        \u53c2\u8003\u300cReference patterns – Patterns – The Rust Reference\u300d<\/p>\n
        2.2. \u300c\u30b9\u30e9\u30a4\u30b9\u30d1\u30bf\u30fc\u30f3\u300d\u306b\u3088\u308b\u5206\u5272\u4ee3\u5165<\/h2>\n
        let<\/span> something<\/span> =<\/span> [<\/span>10<\/span>,<\/span> 20<\/span>,<\/span> 30<\/span>];<\/span> \/\/ Vec \u3082\u53ef<\/span>\r\n\r\nlet<\/span> [<\/span>foo<\/span>,<\/span> bar<\/span>,<\/span> baz<\/span>]<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u914d\u5217\u306e\u5206\u5272<\/span>\r\nprintln!<\/span>(<\/span>\"{} {} {}\"<\/span>,<\/span> foo<\/span>,<\/span> bar<\/span>,<\/span> baz<\/span>);<\/span>\r\n\r\nlet<\/span> [<\/span>foo<\/span>,<\/span> bar<\/span>,<\/span> _<\/span>]<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u914d\u5217\u306e\u5206\u5272: \u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9\u30d1\u30bf\u30fc\u30f3<\/span>\r\nprintln!<\/span>(<\/span>\"{} {}\"<\/span>,<\/span> foo<\/span>,<\/span> bar<\/span>);<\/span>\r\n\r\nlet<\/span> [<\/span>foo<\/span>,<\/span> ..<\/span>]<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u914d\u5217\u306e\u5206\u5272: \u6b8b\u4f59\u30d1\u30bf\u30fc\u30f3<\/span>\r\nprintln!<\/span>(<\/span>\"{}\"<\/span>,<\/span> foo<\/span>);<\/span>\r\n\r\nlet<\/span> [<\/span>foo<\/span>,<\/span> bar<\/span> @<\/span> ..<\/span>]<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u914d\u5217\u306e\u5206\u5272: \u8b58\u5225\u5b50\u30d1\u30bf\u30fc\u30f3: @ \u30b5\u30d6\u30d1\u30bf\u30fc\u30f3: \u6b8b\u4f59\u30d1\u30bf\u30fc\u30f3<\/span>\r\nprintln!<\/span>(<\/span>\"{} {:?}\"<\/span>,<\/span> foo<\/span>,<\/span> bar<\/span>);<\/span>\r\n\r\nlet<\/span> [<\/span>foo<\/span>,<\/span> bar<\/span>,<\/span> ref<\/span> baz<\/span>]<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u914d\u5217\u306e\u5206\u5272: \u8b58\u5225\u5b50\u30d1\u30bf\u30fc\u30f3: \u501f\u7528<\/span>\r\nprintln!<\/span>(<\/span>\"{} {} {}\"<\/span>,<\/span> foo<\/span>,<\/span> bar<\/span>,<\/span> *<\/span>baz<\/span>);<\/span>\r\n<\/code><\/pre>\n
        \u203b\u975e\u69cb\u9020\u5316\u3067\u306f\u3001\u5206\u89e3\u3057\u305f\u5909\u6570\u3054\u3068\u306b\u53f3\u8fba\u5074\u306b\u501f\u7528\u6f14\u7b97\u5b50 (\u53c2\u7167\u6f14\u7b97\u5b50) & \u3092\u4ed8\u3051\u3066\u501f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u501f\u7528\u3057\u305f\u3044\u5834\u5408\u306f\u5de6\u8fba\u5074\u306e\u8b58\u5225\u5b50 (\u5909\u6570\u540d) \u524d\u306b\u30ad\u30fc\u30ef\u30fc\u30c9 ref \u3092\u4ed8\u3051\u3066\u501f\u7528\u3057\u307e\u3059\u3002
        \n\u203b\u30ad\u30fc\u30ef\u30fc\u30c9 mut \u3082\u30ad\u30fc\u30ef\u30fc\u30c9 ref \u3068\u540c\u69d8\u306b\u5de6\u8fba\u5074\u306e\u8b58\u5225\u5b50 (\u5909\u6570\u540d) \u524d\u3067\u5229\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n
        \u53c2\u8003\u300cSlice patterns – Patterns – The Rust Reference\u300d<\/p>\n
        2.3. \u300c\u30bf\u30d7\u30eb\u30d1\u30bf\u30fc\u30f3\u300d\u306b\u3088\u308b\u30bf\u30d7\u30eb\u306e\u5206\u89e3<\/h2>\n
        let<\/span> something<\/span> =<\/span> (<\/span>23<\/span>,<\/span> 'B'<\/span>,<\/span> true<\/span>);<\/span>\r\n\r\nlet<\/span> (<\/span>foo<\/span>,<\/span> bar<\/span>,<\/span> baz<\/span>)<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u30bf\u30d7\u30eb\u306e\u5206\u89e3<\/span>\r\nprintln!<\/span>(<\/span>\"{} {} {}\"<\/span>,<\/span> foo<\/span>,<\/span> bar<\/span>,<\/span> baz<\/span>);<\/span>\r\n\r\nlet<\/span> (<\/span>foo<\/span>,<\/span> bar<\/span>,<\/span> _<\/span>)<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u30bf\u30d7\u30eb\u306e\u5206\u89e3: \u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9\u30d1\u30bf\u30fc\u30f3<\/span>\r\nprintln!<\/span>(<\/span>\"{} {}\"<\/span>,<\/span> foo<\/span>,<\/span> bar<\/span>);<\/span>\r\n\r\nlet<\/span> (<\/span>foo<\/span>,<\/span> ..<\/span>)<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u30bf\u30d7\u30eb\u306e\u5206\u89e3: \u6b8b\u4f59\u30d1\u30bf\u30fc\u30f3<\/span>\r\nprintln!<\/span>(<\/span>\"{}\"<\/span>,<\/span> foo<\/span>);<\/span>\r\n\r\n\/\/ \u30b9\u30e9\u30a4\u30b9\u30d1\u30bf\u30fc\u30f3\u4ee5\u5916\u3067\u306f\u4e0d\u53ef<\/span>\r\n\/\/ let (foo, bar @ ..) = something; \/\/ \u30bf\u30d7\u30eb\u306e\u5206\u89e3: \u8b58\u5225\u5b50\u30d1\u30bf\u30fc\u30f3: @ \u30b5\u30d6\u30d1\u30bf\u30fc\u30f3: \u6b8b\u4f59\u30d1\u30bf\u30fc\u30f3<\/span>\r\n\r\nlet<\/span> (<\/span>foo<\/span>,<\/span> bar<\/span>,<\/span> ref<\/span> baz<\/span>)<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u30bf\u30d7\u30eb\u306e\u5206\u89e3: \u8b58\u5225\u5b50\u30d1\u30bf\u30fc\u30f3: \u501f\u7528<\/span>\r\nprintln!<\/span>(<\/span>\"{} {} {}\"<\/span>,<\/span> foo<\/span>,<\/span> bar<\/span>,<\/span> *<\/span>baz<\/span>);<\/span>\r\n<\/code><\/pre>\n
        \u203b\u30ad\u30fc\u30ef\u30fc\u30c9 ref \u3084 mut \u306f\u300c\u30b9\u30e9\u30a4\u30b9\u30d1\u30bf\u30fc\u30f3\u300d\u3068\u540c\u69d8\u3002<\/p>\n
        \u53c2\u8003\u300cTuple patterns – Patterns – The Rust Reference\u300d<\/p>\n
        2.4. \u300c\u69cb\u9020\u4f53\u30d1\u30bf\u30fc\u30f3\u300d\u306b\u3088\u308b\u69cb\u9020\u4f53\u306e\u5206\u89e3<\/h2>\n
        struct<\/span> Something<\/span> {<\/span>\r\n    foo<\/span>:<\/span> i32<\/span>,<\/span>\r\n    bar<\/span>:<\/span> char<\/span>,<\/span>\r\n    baz<\/span>:<\/span> bool<\/span>,<\/span>\r\n}<\/span>\r\n\r\n\/\/<\/span>\r\nlet<\/span> something<\/span> =<\/span> Something<\/span> {<\/span>\r\n    foo<\/span>:<\/span> 23<\/span>,<\/span>\r\n    bar<\/span>:<\/span> 'B'<\/span>,<\/span>\r\n    baz<\/span>:<\/span> true<\/span>,<\/span>\r\n};<\/span>\r\n\r\nlet<\/span> Something<\/span> {<\/span> foo<\/span>,<\/span> bar<\/span>,<\/span> baz<\/span> }<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u69cb\u9020\u4f53\u306e\u5206\u89e3<\/span>\r\nprintln!<\/span>(<\/span>\"{} {} {}\"<\/span>,<\/span> foo<\/span>,<\/span> bar<\/span>,<\/span> baz<\/span>);<\/span>\r\n\r\nlet<\/span> Something<\/span> {<\/span> foo<\/span>,<\/span> bar<\/span>,<\/span> baz<\/span>:<\/span> qux<\/span> }<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u69cb\u9020\u4f53\u306e\u5206\u89e3: \u8b58\u5225\u5b50\u30d1\u30bf\u30fc\u30f3 (\u5225\u540d): qux = baz<\/span>\r\nprintln!<\/span>(<\/span>\"{} {} {}\"<\/span>,<\/span> foo<\/span>,<\/span> bar<\/span>,<\/span> qux<\/span>);<\/span>\r\n\r\nlet<\/span> Something<\/span> {<\/span> foo<\/span>,<\/span> bar<\/span>,<\/span> baz<\/span>:<\/span> _<\/span> }<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u69cb\u9020\u4f53\u306e\u5206\u89e3: \u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9\u30d1\u30bf\u30fc\u30f3: _ = baz<\/span>\r\nprintln!<\/span>(<\/span>\"{} {}\"<\/span>,<\/span> foo<\/span>,<\/span> bar<\/span>);<\/span>\r\n\r\nlet<\/span> Something<\/span> {<\/span> foo<\/span>,<\/span> ..<\/span> }<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u69cb\u9020\u4f53\u306e\u5206\u89e3: \u6b8b\u4f59\u30d1\u30bf\u30fc\u30f3<\/span>\r\nprintln!<\/span>(<\/span>\"{}\"<\/span>,<\/span> foo<\/span>);<\/span>\r\n\r\nlet<\/span> Something<\/span> {<\/span> foo<\/span>,<\/span> bar<\/span>,<\/span> ref<\/span> baz<\/span> }<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u69cb\u9020\u4f53\u306e\u5206\u89e3: \u501f\u7528: ref baz = baz<\/span>\r\nprintln!<\/span>(<\/span>\"{} {} {}\"<\/span>,<\/span> foo<\/span>,<\/span> bar<\/span>,<\/span> *<\/span>baz<\/span>);<\/span>\r\n<\/code><\/pre>\n
        \u203b\u30ad\u30fc\u30ef\u30fc\u30c9 ref \u3084 mut \u306f\u300c\u30b9\u30e9\u30a4\u30b9\u30d1\u30bf\u30fc\u30f3\u300d\u3068\u540c\u69d8\u3002
        \n\u203b\u53b3\u5bc6\u306b\u306f\u3001\u69cb\u9020\u4f53\u306e\u5834\u5408\u3001\u30ad\u30fc\u30ef\u30fc\u30c9 ref \u3084 mut \u306f\u300c\u69cb\u9020\u4f53\u30d1\u30bf\u30fc\u30f3\u30d5\u30a3\u30fc\u30eb\u30c9\u300d\u3068\u3057\u3066\u89e3\u6790\u3055\u308c\u308b\u5834\u5408\u3068\u300c\u8b58\u5225\u5b50\u30d1\u30bf\u30fc\u30f3\u300d\u3068\u3057\u3066\u89e3\u6790\u3055\u308c\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
        \u53c2\u8003\u300cStruct patterns – Patterns – The Rust Reference\u300d<\/p>\n
        2.5. \u300c\u30bf\u30d7\u30eb\u69cb\u9020\u4f53\u30d1\u30bf\u30fc\u30f3\u300d\u306b\u3088\u308b\u30bf\u30d7\u30eb\u69cb\u9020\u4f53\u306e\u5206\u89e3<\/h2>\n
        \u300c\u30bf\u30d7\u30eb\u69cb\u9020\u4f53\u30d1\u30bf\u30fc\u30f3\u300d\u3067\u306f\u300c\u69cb\u9020\u4f53\u30d1\u30bf\u30fc\u30f3\u300d\u3068\u540c\u69d8\u306b\u69cb\u9020\u4f53\u306e\u30d1\u30b9\u306e\u4e00\u81f4\u304c\u78ba\u8a8d\u3055\u308c\u3001\u300c\u30bf\u30d7\u30eb\u30d1\u30bf\u30fc\u30f3\u300d\u3068\u540c\u69d8\u306b\u8981\u7d20\u304c\u5206\u89e3\u3055\u308c\u307e\u3059\u3002<\/p>\n
        struct<\/span> Something<\/span>(<\/span>i32<\/span>,<\/span> char<\/span>,<\/span> bool<\/span>);<\/span>\r\n\r\n\/\/<\/span>\r\nlet<\/span> something<\/span> =<\/span> Something<\/span>(<\/span>23<\/span>,<\/span> 'B'<\/span>,<\/span> true<\/span>);<\/span>\r\n\r\nlet<\/span> Something<\/span>(<\/span>foo<\/span>,<\/span> bar<\/span>,<\/span> baz<\/span>)<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u30bf\u30d7\u30eb\u69cb\u9020\u4f53\u306e\u5206\u89e3<\/span>\r\nprintln!<\/span>(<\/span>\"{} {} {}\"<\/span>,<\/span> foo<\/span>,<\/span> bar<\/span>,<\/span> baz<\/span>);<\/span>\r\n\r\nlet<\/span> Something<\/span>(<\/span>foo<\/span>,<\/span> bar<\/span>,<\/span> _<\/span>)<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u30bf\u30d7\u30eb\u69cb\u9020\u4f53\u306e\u5206\u89e3: \u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9\u30d1\u30bf\u30fc\u30f3<\/span>\r\nprintln!<\/span>(<\/span>\"{} {}\"<\/span>,<\/span> foo<\/span>,<\/span> bar<\/span>);<\/span>\r\n\r\nlet<\/span> Something<\/span>(<\/span>foo<\/span>,<\/span> ..<\/span>)<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u30bf\u30d7\u30eb\u69cb\u9020\u4f53\u306e\u5206\u89e3: \u6b8b\u4f59\u30d1\u30bf\u30fc\u30f3<\/span>\r\nprintln!<\/span>(<\/span>\"{}\"<\/span>,<\/span> foo<\/span>);<\/span>\r\n\r\n\/\/ \u30b9\u30e9\u30a4\u30b9\u30d1\u30bf\u30fc\u30f3\u4ee5\u5916\u3067\u306f\u4e0d\u53ef<\/span>\r\n\/\/ let Something (foo, bar @ ..) = something; \/\/ \u30bf\u30d7\u30eb\u69cb\u9020\u4f53\u306e\u5206\u89e3: \u8b58\u5225\u5b50\u30d1\u30bf\u30fc\u30f3: @ \u30b5\u30d6\u30d1\u30bf\u30fc\u30f3: \u6b8b\u4f59\u30d1\u30bf\u30fc\u30f3<\/span>\r\n\r\nlet<\/span> Something<\/span>(<\/span>foo<\/span>,<\/span> bar<\/span>,<\/span> ref<\/span> baz<\/span>)<\/span> =<\/span> something<\/span>;<\/span> \/\/ \u30bf\u30d7\u30eb\u69cb\u9020\u4f53\u306e\u5206\u89e3: \u8b58\u5225\u5b50\u30d1\u30bf\u30fc\u30f3: \u501f\u7528<\/span>\r\nprintln!<\/span>(<\/span>\"{} {} {}\"<\/span>,<\/span> foo<\/span>,<\/span> bar<\/span>,<\/span> *<\/span>baz<\/span>);<\/span>\r\n<\/code><\/pre>\n
        \u203b\u30ad\u30fc\u30ef\u30fc\u30c9 ref \u3084 mut \u306f\u300c\u30b9\u30e9\u30a4\u30b9\u30d1\u30bf\u30fc\u30f3\u300d\u3068\u540c\u69d8\u3002<\/p>\n
        \u53c2\u8003\u300cTuple struct patterns – Patterns – The Rust Reference\u300d<\/p>\n
        2.6. \u5217\u6319\u578b\u306e\u5217\u6319\u5b50\u306e\u5206\u89e3<\/h2>\n
        \u5217\u6319\u578b\u306f\u5217\u6319\u5b50\u306e\u69cb\u9020\u3054\u3068\u306b\u300c\u30d1\u30b9\u30d1\u30bf\u30fc\u30f3\u300d\u3084\u300c\u30bf\u30d7\u30eb\u69cb\u9020\u4f53\u30d1\u30bf\u30fc\u30f3\u300d\u3001\u300c\u69cb\u9020\u4f53\u30d1\u30bf\u30fc\u30f3\u300d\u3068\u3057\u3066\u89e3\u6790\u3055\u308c\u3001\u5206\u89e3\u3055\u308c\u307e\u3059\u3002<\/p>\n
        (\u203b\u300c\u30d1\u30b9\u30d1\u30bf\u30fc\u30f3\u300d\u306f\u5909\u6570\u3092\u675f\u7e1b\u3057\u307e\u305b\u3093\u3002)<\/p>\n
        \u5217\u6319\u578b Option \u3084 Result \u3067\u4f7f\u3046\u3053\u3068\u304c\u591a\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
        let<\/span> foo<\/span> =<\/span> Some<\/span>(<\/span>23<\/span>);<\/span>\r\n\r\nif<\/span> let<\/span> Some<\/span>(<\/span>bar<\/span>)<\/span> =<\/span> foo<\/span> {<\/span> \/\/ \u5217\u6319\u5b50\u306e\u5206\u89e3: \u30bf\u30d7\u30eb\u69cb\u9020\u4f53\u30d1\u30bf\u30fc\u30f3<\/span>\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> bar<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        let<\/span> foo<\/span>:<\/span> Result<\/span><<\/span>(),<\/span> _<\/span>><\/span> =<\/span> Err<\/span>(<\/span>\"Error\"<\/span>);<\/span>\r\n\r\nif<\/span> let<\/span> Err<\/span>(<\/span>bar<\/span>)<\/span> =<\/span> foo<\/span> {<\/span> \/\/ \u5217\u6319\u5b50\u306e\u5206\u89e3: \u30bf\u30d7\u30eb\u69cb\u9020\u4f53\u30d1\u30bf\u30fc\u30f3<\/span>\r\n    eprintln!<\/span>(<\/span>\"{}\"<\/span>,<\/span> bar<\/span>);<\/span>\r\n    \/\/ process::exit(1);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        \u53c2\u8003\u300cDestructuring – Patterns – The Rust Reference\u300d
        \n\u53c2\u8003\u300cTuple struct patterns – Patterns – The Rust Reference\u300d
        \n\u53c2\u8003\u300cPath patterns – Patterns – The Rust Reference\u300d<\/p>\n","protected":false},"excerpt":{"rendered":"
        Rust \u3067\u300c\u30d1\u30bf\u30fc\u30f3\u300d\u306b\u3064\u3044\u3066\u8abf\u3079\u308b\u3068\u304d match \u5f0f\u306b\u6ce8\u76ee\u3057\u304c\u3061\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u95a2\u6570\u7b49\u306e\u5f15\u6570\u3084 let […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45649","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\/45649-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"Rust \u3067\u300c\u30d1\u30bf\u30fc\u30f3\u300d\u306b\u3064\u3044\u3066\u8abf\u3079\u308b\u3068\u304d match \u5f0f\u306b\u6ce8\u76ee\u3057\u304c\u3061\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u95a2\u6570\u7b49\u306e\u5f15\u6570\u3084 let […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45649-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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Silicon Cloud","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.silicloud.com\/zh\/blog\/45649-2\/","og_locale":"zh_CN","og_type":"article","og_description":"Rust \u3067\u300c\u30d1\u30bf\u30fc\u30f3\u300d\u306b\u3064\u3044\u3066\u8abf\u3079\u308b\u3068\u304d match \u5f0f\u306b\u6ce8\u76ee\u3057\u304c\u3061\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u95a2\u6570\u7b49\u306e\u5f15\u6570\u3084 let […]","og_url":"https:\/\/www.silicloud.com\/zh\/blog\/45649-2\/","og_site_name":"Blog - Silicon Cloud","article_published_time":"2023-05-09T00:52:34+00:00","article_modified_time":"2024-04-29T10:13:27+00:00","author":"\u6587, \u7fd4","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"\u6587, \u7fd4","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"2 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.silicloud.com\/zh\/blog\/45649-2\/","url":"https:\/\/www.silicloud.com\/zh\/blog\/45649-2\/","name":"- Blog - 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Silicon Cloud"}]}},"_links":{"self":[{"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/posts\/45649","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/comments?post=45649"}],"version-history":[{"count":2,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/posts\/45649\/revisions"}],"predecessor-version":[{"id":86840,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/posts\/45649\/revisions\/86840"}],"wp:attachment":[{"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/media?parent=45649"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/categories?post=45649"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.silicloud.com\/zh\/blog\/wp-json\/wp\/v2\/tags?post=45649"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}