{"id":45409,"date":"2022-12-04T23:57:41","date_gmt":"2024-01-09T06:55:09","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45409-2\/"},"modified":"2024-04-29T03:46:01","modified_gmt":"2024-04-28T19:46:01","slug":"45409-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45409-2\/","title":{"rendered":""},"content":{"rendered":"

\u30b3\u30fc\u30c9\u4e0a\u3067\u578b\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b\u306f\u4ee5\u4e0b\u306e\u95a2\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3067\u78ba\u8a8d\u3067\u304d\u308b<\/p>\n

fn<\/span> print_typename<\/span><<\/span>T<\/span>><\/span>(<\/span>_<\/span>:<\/span> T<\/span>)<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> std<\/span>::<\/span>any<\/span>::<\/span>type_name<\/span>::<\/span><<\/span>T<\/span>><\/span>());<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> s1<\/span>:<\/span> &<\/span>str<\/span> =<\/span> \"hello\"<\/span>;<\/span>\r\n    print_typename<\/span>(<\/span>s1<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30b9\u30ab\u30e9(\u6570\u5024)\u578b<\/h1>\n
\u7b26\u53f7\u3068\u305d\u306e\u5927\u304d\u3055\uff08\u30d3\u30c3\u30c8\u6570\uff09\u3067\u8868\u3059<\/p>\n
\u7b26\u53f7\u3042\u308a\u6574\u6570\u578b: i, \u7b26\u53f7\u306a\u3057\u6574\u6570\u578b: u, \u6d6e\u52d5\u5c0f\u6570\u70b9\u578b: f<\/p>\n
    \n
  • \n
      \u7b26\u53f7\u4ed8\u304d\u6574\u6570:\u00a0i8,\u00a0i16,\u00a0i32,\u00a0i64,\u00a0i128,\u00a0isize\uff08\u30dd\u30a4\u30f3\u30bf\u306e\u30b5\u30a4\u30ba\uff09<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \n
      • \n
          \u7b26\u53f7\u7121\u3057\u6574\u6570:\u00a0u8,\u00a0u16,\u00a0u32,\u00a0u64,\u00a0u128,\u00a0usize\uff08\u30dd\u30a4\u30f3\u30bf\u306e\u30b5\u30a4\u30ba\uff09<\/ul>\n<\/li>\n<\/ul>\n
           <\/p>\n
            \u6d6e\u52d5\u5c0f\u6570\u70b9\u6570:\u00a0f32,\u00a0f64\uff08\u6d6e\u52d5\u5c0f\u6570\u70b9\u578b\u306f32, 64\u30d3\u30c3\u30c8\u306e\u307f\uff09<\/ul>\n
            Bool\u578b<\/h1>\n
              \u30d6\u30fc\u30ea\u30a2\u30f3: bool:\u00a0true\u307e\u305f\u306ffalse<\/ul>\n
              \u6587\u5b57\u5217\u578b<\/h1>\n
              str<\/h2>\n
              \u30b3\u30a2\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u6587\u5b57\u5217\u578b\u306fstr\u3060\u3051\u3002<\/p>\n
              str\u306f\u6587\u5b57\u30b9\u30e9\u30a4\u30b9\u3002\u30b9\u30e9\u30a4\u30b9: \u30e1\u30e2\u30ea\u4e0a\u306b\u5b58\u5728\u3059\u308b\u6587\u5b57\u5217\u30c7\u30fc\u30bf\u306e\u30b9\u30bf\u30fc\u30c8\u5730\u70b9\u3068\u9577\u3055\u3092\u793a\u3059<\/p>\n
              \u2192 \u6271\u3046\u30c7\u30fc\u30bf\u306f\u56fa\u5b9a\u30b5\u30a4\u30ba\u3067\u6587\u5b57\u5217\u305d\u306e\u3082\u306e\u306e\u5909\u66f4\u306f\u3067\u304d\u306a\u3044\u3002<\/p>\n
              String<\/h2>\n
              String\u306f\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u6587\u5b57\u5217\u578b\u3002\u6587\u5b57\u5217\u30c7\u30fc\u30bf\u306e\u5909\u66f4\u3084\u9577\u3055\u306e\u5909\u66f4\u304c\u53ef\u80fd\u3002<\/p>\n
              \u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308bString\u304c\u3088\u304f\u4f7f\u3046\u3002<\/p>\n
              str\u3068String\u306f\u3069\u3061\u3089\u3082UTF-8\u30a8\u30f3\u30b3\u30fc\u30c9\u3055\u308c\u305f\u6587\u5b57\u5217\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3059\u308b\u3002\u304a\u4e92\u3044\u306b\u578b\u5909\u63db\u53ef\u80fd\u3002<\/p>\n
              fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> s1<\/span>:<\/span> String<\/span> =<\/span> String<\/span>::<\/span>from<\/span>(<\/span>\"hello, world!\"<\/span>);<\/span>\r\n    let<\/span> s2<\/span>:<\/span> &<\/span>str<\/span> =<\/span> &<\/span>s1<\/span>;<\/span> \/\/ String -> &str<\/span>\r\n    let<\/span> s3<\/span>:<\/span> String<\/span> =<\/span> s2<\/span>.to_string<\/span>();<\/span> \/\/ &str -> String<\/span>\r\n    println!<\/span>(<\/span>\"s1: {}, s2: {}, s3: {}\"<\/span>,<\/span> s1<\/span>,<\/span> s2<\/span>,<\/span> s3<\/span>)<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
              String\u2192&str\u3078\u306e\u5909\u63db\u306f\u30dd\u30a4\u30f3\u30bf\u3068\u6587\u5b57\u5217\u9577\u3092\u30b3\u30d4\u30fc\u3057\u3066\u30b9\u30e9\u30a4\u30b9\u3092\u4f5c\u308b\u305f\u3081\u30e1\u30e2\u30ea\u5727\u8feb\u306f\u3057\u306a\u3044\u304c\u3001\u9006\u306f\u30e1\u30e2\u30ea\u78ba\u4fdd\u304c\u884c\u308f\u308c\u308b\u306e\u3067\u9577\u3044\u6587\u5b57\u5217\u306e\u5909\u63db\u306f\u6ce8\u610f\u304c\u5fc5\u8981\u3002<\/p>\n
                \n
              • \n
                  \u6587\u5b57: char:\u00a0‘a’,\u00a0‘\u03b1’,\u00a0‘\u221e’\u306a\u3069\u306eUnicode\u306e\u30b9\u30ab\u30e9\u30fc\u5024<\/ul>\n<\/li>\n<\/ul>\n
                   <\/p>\n
                    \u6587\u5b57\u5217: &str: hello\u306a\u3069<\/ul>\n
                    \u53c2\u8003\uff1a\u30d3\u30eb\u30c9\u6642\u306b\u5024\u304c\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u304b\u306f\u5909\u6570\u3067\u306f\u306a\u304f\u4ee3\u5165\u3059\u308b\u5024\u304c\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u304b\u304c\u898b\u3089\u308c\u308b<\/h3>\n
                    fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> mut<\/span> foo<\/span>:<\/span> String<\/span> =<\/span> String<\/span>::<\/span>from<\/span>(<\/span>\"hello\"<\/span>);<\/span>\r\n    foo<\/span> =<\/span> \"Hi!\"<\/span>.to_string<\/span>();<\/span>\r\n\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> foo<\/span>);<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
                    \u4e0a\u8a18\u306e\u7d50\u679c\u3001\u5909\u6570foo\u306fprintln!\u3067\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u304cString::from(“hello”)\u304c\u4f7f\u7528\u3055\u308c\u3066\u3044\u306a\u3044\u305f\u3081\u4ee5\u4e0b\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u51fa\u529b\u3055\u308c\u308b\u3002<\/p>\n
                    \u276f cargo run\r\nwarning: value assigned to `<\/span>foo`<\/span> is never read<\/span>\r\n --<\/span>><\/span> src\/main.rs:2:13\r\n  |\r\n2 |     let <\/span>mut foo: String =<\/span> String::from(<\/span>\"hello\"<\/span>)<\/span>;<\/span>\r\n  |             ^^^\r\n  |\r\n  =<\/span> note: `<\/span>#[warn(unused_assignments)]` on by default<\/span>\r\n  =<\/span> help<\/span>: maybe it is overwritten before being read<\/span>?\r\n\r\nwarning: `<\/span>rust-tutorial`<\/span> (<\/span>bin \"rust-tutorial\"<\/span>)<\/span> generated 1 warning\r\n    Finished dev [<\/span>unoptimized + debuginfo] target(<\/span>s)<\/span> in <\/span>0.00s\r\n     Running `<\/span>target\/debug\/rust-tutorial`<\/span>\r\nHi!\r\n<\/code><\/pre>\n
                    \u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3067\u3042\u308c\u3070\u8b66\u544a\u306f\u51fa\u306a\u3044\u3002<\/p>\n
                    fn main()<\/span> {<\/span>\r\n    let <\/span>mut foo: String =<\/span> String::from(<\/span>\"hello\"<\/span>)<\/span>;<\/span>\r\n    println!(<\/span>\"{}\"<\/span>, foo)<\/span>;<\/span> \/\/ \u3053\u3053\u3067String::from(<\/span>\"hello\"<\/span>)<\/span>;<\/span>\u304c\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\r\n\r\n    foo =<\/span> \"Hi!\"<\/span>.to_string()<\/span>;<\/span>\r\n    println!(<\/span>\"{}\"<\/span>, foo)<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                    \u30bf\u30d7\u30eb\u578b<\/h1>\n
                    \u7570\u306a\u308b\u578b\u306e\u5024\u306e\u96c6\u5408\u3002\u8981\u7d20\u306e\u6570\u306f\u56fa\u5b9a\u3002\u578b\u3092\u5f8c\u304b\u3089\u5909\u66f4\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u306a\u3044\u3002<\/p>\n
                    \u95a2\u6570\u3067\u8907\u6570\u306e\u5024\u3092\u307e\u3068\u3081\u3066\u8fd4\u3059\u3068\u304d\u306b\u4fbf\u5229\u3002<\/p>\n
                    \u5185\u90e8\u306e\u5024\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3068\u304d\u306f.1\u3067\u30a2\u30af\u30bb\u30b9\u3002<\/p>\n
                    let<\/span> x<\/span>:<\/span> (<\/span>i32<\/span>,<\/span> f64<\/span>,<\/span> char<\/span>)<\/span> =<\/span> (<\/span>1<\/span>,<\/span> 1.2<\/span>,<\/span> 'h'<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> x<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"x: {}\"<\/span>,<\/span> x<\/span>.0<\/span>)<\/span>\r\n<\/code><\/pre>\n
                    \u914d\u5217\u578b<\/h1>\n
                    \u540c\u3058\u578b\u306e\u5024\u306e\u96c6\u5408\u3002\u540c\u3058\u578b\u3067\u8981\u7d20\u306e\u6570\u306f\u56fa\u5b9a\u3002<\/p>\n
                    \u5185\u90e8\u306e\u5024\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3068\u304d\u306f[]\u3067\u30a2\u30af\u30bb\u30b9\u3002<\/p>\n
                    let<\/span> x<\/span>:<\/span> [<\/span>i32<\/span>,<\/span> 3<\/span>]<\/span> =<\/span> [<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>];<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> x<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\u201dx<\/span>:<\/span> {}<\/span>\u201d,<\/span> x<\/span>[<\/span>0<\/span>])<\/span>\r\n<\/code><\/pre>\n
                    \u914d\u5217\u3092\u53c2\u7167\u3059\u308b\u3068\u304d\u306f\u30b9\u30e9\u30a4\u30b9\u3068\u3057\u3066\u6271\u308f\u308c\u308b\u3002\u3088\u3063\u3066[start..end]\u306e\u3088\u3046\u306b\u7bc4\u56f2\u6307\u5b9a\u3082\u3067\u304d\u308b\u3002<\/p>\n
                    let<\/span> a<\/span>:<\/span> [<\/span>i32<\/span>;<\/span> 3<\/span>]<\/span> =<\/span> [<\/span>0<\/span>,<\/span> 1<\/span>,<\/span> 2<\/span>];<\/span>\r\nprintln!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> &<\/span>a<\/span>[<\/span>1<\/span>..<\/span>3<\/span>]);<\/span>\r\n<\/code><\/pre>\n
                    \u30e6\u30fc\u30b6\u5b9a\u7fa9\u578b<\/h1>\n
                    Struct<\/h2>\n
                    struct<\/span> Person<\/span> {<\/span>\r\n    name<\/span>:<\/span> String<\/span>,<\/span>\r\n    age<\/span>:<\/span> u32<\/span>,<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> person<\/span> =<\/span> Person<\/span> {<\/span>\r\n        name<\/span>:<\/span> \"John\"<\/span>.to_string<\/span>(),<\/span>\r\n        age<\/span>:<\/span> 42<\/span>,<\/span>\r\n    };<\/span>\r\n    println!<\/span>(<\/span>\"{}, {}\"<\/span>,<\/span> person<\/span>.name<\/span>,<\/span> person<\/span>.age<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                    Enum\u578b<\/h2>\n
                    enum<\/span> Event<\/span> {<\/span>\r\n    Quit<\/span>,<\/span>\r\n    KeyDown<\/span>(<\/span>u8<\/span>),<\/span>\r\n    MouseDown<\/span> {<\/span> x<\/span>:<\/span> i32<\/span>,<\/span> y<\/span>:<\/span> i32<\/span> },<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> e1<\/span> =<\/span> Event<\/span>::<\/span>Quit<\/span>;<\/span>\r\n    let<\/span> e2<\/span> =<\/span> Event<\/span>::<\/span>KeyDown<\/span>(<\/span>27<\/span>);<\/span>\r\n    let<\/span> e3<\/span> =<\/span> Event<\/span>::<\/span>MouseDown<\/span> {<\/span> x<\/span>:<\/span> 10<\/span>,<\/span> y<\/span>:<\/span> 20<\/span> };<\/span>\r\n\r\n    match<\/span> e1<\/span> {<\/span>\r\n        Event<\/span>::<\/span>Quit<\/span> =><\/span> println!<\/span>(<\/span>\"Quit\"<\/span>),<\/span>\r\n        Event<\/span>::<\/span>KeyDown<\/span>(<\/span>key<\/span>)<\/span> =><\/span> println!<\/span>(<\/span>\"KeyDown: {}\"<\/span>,<\/span> key<\/span>),<\/span>\r\n        Event<\/span>::<\/span>MouseDown<\/span> {<\/span> x<\/span>,<\/span> y<\/span> }<\/span> =><\/span> println!<\/span>(<\/span>\"MouseDown: {}, {}\"<\/span>,<\/span> x<\/span>,<\/span> y<\/span>),<\/span>\r\n    }<\/span>\r\n    match<\/span> e2<\/span> {<\/span>\r\n        Event<\/span>::<\/span>Quit<\/span> =><\/span> println!<\/span>(<\/span>\"Quit\"<\/span>),<\/span>\r\n        Event<\/span>::<\/span>KeyDown<\/span>(<\/span>key<\/span>)<\/span> =><\/span> println!<\/span>(<\/span>\"KeyDown: {}\"<\/span>,<\/span> key<\/span>),<\/span>\r\n        Event<\/span>::<\/span>MouseDown<\/span> {<\/span> x<\/span>,<\/span> y<\/span> }<\/span> =><\/span> println!<\/span>(<\/span>\"MouseDown: {}, {}\"<\/span>,<\/span> x<\/span>,<\/span> y<\/span>),<\/span>\r\n    }<\/span>\r\n    match<\/span> e3<\/span> {<\/span>\r\n        Event<\/span>::<\/span>Quit<\/span> =><\/span> println!<\/span>(<\/span>\"Quit\"<\/span>),<\/span>\r\n        Event<\/span>::<\/span>KeyDown<\/span>(<\/span>key<\/span>)<\/span> =><\/span> println!<\/span>(<\/span>\"KeyDown: {}\"<\/span>,<\/span> key<\/span>),<\/span>\r\n        Event<\/span>::<\/span>MouseDown<\/span> {<\/span> x<\/span>,<\/span> y<\/span> }<\/span> =><\/span> println!<\/span>(<\/span>\"MouseDown: {}, {}\"<\/span>,<\/span> x<\/span>,<\/span> y<\/span>),<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                    Option\u578b<\/h1>\n
                    \u30c7\u30fc\u30bf\u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u3068\u3001\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u3092\u8868\u73fe\u3067\u304d\u308b\u5217\u6319\u578b\u3002<\/p>\n
                    \u30c7\u30fc\u30bf\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306fNone\u3001\u5b58\u5728\u3059\u308b\u5834\u5408\u306f\u305d\u306e\u578b\u3092T\u3068\u3057\u305f\u3068\u304dSome(T)\u3068\u8868\u73fe\u3055\u308c\u308b\u3002<\/p>\n
                    \u4ee3\u5165\u306f\u305f\u3044\u3066\u3044if\u3068\u5408\u308f\u305b\u3066\u4f7f\u7528\u3055\u308c\u3001\u7d50\u679c\u306fmatch\u3067\u53c2\u7167\u3055\u308c\u308b\u3002<\/p>\n
                    fn<\/span> divide<\/span>(<\/span>a<\/span>:<\/span> i32<\/span>,<\/span> b<\/span>:<\/span> i32<\/span>)<\/span> -><\/span> Option<\/span><<\/span>i32<\/span>><\/span> {<\/span>\r\n    if<\/span> b<\/span> ==<\/span> 0<\/span> {<\/span>\r\n        None<\/span>\r\n    }<\/span> else<\/span> {<\/span>\r\n        Some<\/span>(<\/span>a<\/span> \/<\/span> b<\/span>)<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> mut<\/span> x<\/span>:<\/span> Option<\/span><<\/span>i32<\/span>><\/span> =<\/span> divide<\/span>(<\/span>1<\/span>,<\/span> 0<\/span>);<\/span>\r\n    match<\/span> x<\/span> {<\/span>\r\n        Some<\/span>(<\/span>x<\/span>)<\/span> =><\/span> println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> x<\/span>),<\/span>\r\n        None<\/span> =><\/span> println!<\/span>(<\/span>\"None\"<\/span>),<\/span>\r\n    }<\/span>\r\n\r\n    x<\/span> =<\/span> divide<\/span>(<\/span>10<\/span>,<\/span> 2<\/span>);<\/span>\r\n    match<\/span> x<\/span> {<\/span>\r\n        Some<\/span>(<\/span>x<\/span>)<\/span> =><\/span> println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> x<\/span>),<\/span>\r\n        None<\/span> =><\/span> println!<\/span>(<\/span>\"None\"<\/span>),<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                    Result\u578b<\/h1>\n
                    \u51e6\u7406\u306e\u7d50\u679c\u304c\u6210\u529f\u304b\u30a8\u30e9\u30fc\u304b\u3092\u8868\u73fe\u3067\u304d\u308b\u5217\u6319\u578b\u3002<\/p>\n
                    \u6210\u529f\u306e\u5834\u5408\u306fOk(T)\u3001\u30a8\u30e9\u30fc\u306e\u5834\u5408\u306fErr(E)\u3068\u8868\u73fe\u3055\u308c\u308b\u3002<\/p>\n
                    \u4ee3\u5165\u306f\u305f\u3044\u3066\u3044if\u3068\u5408\u308f\u305b\u3066\u4f7f\u7528\u3055\u308c\u3001\u7d50\u679c\u306fmatch\u3067\u53c2\u7167\u3055\u308c\u308b\u3002<\/p>\n
                    fn<\/span> divide<\/span>(<\/span>a<\/span>:<\/span> i32<\/span>,<\/span> b<\/span>:<\/span> i32<\/span>)<\/span> -><\/span> Result<\/span><<\/span>i32<\/span>,<\/span> String<\/span>><\/span> {<\/span>\r\n    if<\/span> b<\/span> !=<\/span> 0<\/span> {<\/span>\r\n        Ok<\/span>(<\/span>a<\/span> \/<\/span> b<\/span>)<\/span>\r\n    }<\/span> else<\/span> {<\/span>\r\n        Err<\/span>(<\/span>\"Cannot divide by zero\"<\/span>.to_string<\/span>())<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> a<\/span>:<\/span> Result<\/span><<\/span>i32<\/span>,<\/span> String<\/span>><\/span> =<\/span> divide<\/span>(<\/span>1<\/span>,<\/span> 0<\/span>);<\/span>\r\n    match<\/span> a<\/span> {<\/span>\r\n        Ok<\/span>(<\/span>x<\/span>)<\/span> =><\/span> println!<\/span>(<\/span>\"Result is {}\"<\/span>,<\/span> x<\/span>),<\/span>\r\n        Err<\/span>(<\/span>x<\/span>)<\/span> =><\/span> println!<\/span>(<\/span>\"Error is {}\"<\/span>,<\/span> x<\/span>),<\/span>\r\n    }<\/span>\r\n\r\n    let<\/span> b<\/span>:<\/span> Result<\/span><<\/span>i32<\/span>,<\/span> String<\/span>><\/span> =<\/span> divide<\/span>(<\/span>10<\/span>,<\/span> 2<\/span>);<\/span>\r\n    match<\/span> b<\/span> {<\/span>\r\n        Ok<\/span>(<\/span>x<\/span>)<\/span> =><\/span> println!<\/span>(<\/span>\"Result is {}\"<\/span>,<\/span> x<\/span>),<\/span>\r\n        Err<\/span>(<\/span>x<\/span>)<\/span> =><\/span> println!<\/span>(<\/span>\"Error is {}\"<\/span>,<\/span> x<\/span>),<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                    \u7c21\u7565\u5316\u3057\u305f\u66f8\u304d\u65b9<\/h2>\n
                    match \u3084 if \u3067\u66f8\u304f\u3068\u30b3\u30fc\u30c9\u91cf\u304c\u591a\u304f\u306a\u308b\u305f\u3081\u3001unwrap_or() \u3092\u4f7f\u3046\u66f8\u304d\u65b9\u3082\u3042\u308b\u3002<\/p>\n
                    unwrap_or(),\u306e\u5f15\u6570\u306fOk\u3068\u540c\u3058\u578b\u306e\u5024\u3092\u4ee3\u5165\u3059\u308b\u3002<\/p>\n
                    \/\/ \u30bd\u30fc\u30b9<\/span>\r\npub<\/span> fn<\/span> unwrap_or<\/span>(<\/span>self<\/span>,<\/span> default<\/span>:<\/span> T<\/span>)<\/span> -><\/span> T<\/span> {<\/span>\r\n    match<\/span> self<\/span> {<\/span>\r\n        Ok<\/span>(<\/span>t<\/span>)<\/span> =><\/span> t<\/span>,<\/span>\r\n        Err<\/span>(<\/span>_<\/span>)<\/span> =><\/span> default<\/span>,<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                    fn<\/span> divide<\/span>(<\/span>a<\/span>:<\/span> i32<\/span>,<\/span> b<\/span>:<\/span> i32<\/span>)<\/span> -><\/span> Result<\/span><<\/span>i32<\/span>,<\/span> String<\/span>><\/span> {<\/span>\r\n    if<\/span> b<\/span> !=<\/span> 0<\/span> {<\/span>\r\n        Ok<\/span>(<\/span>a<\/span> \/<\/span> b<\/span>)<\/span>\r\n    }<\/span> else<\/span> {<\/span>\r\n        Err<\/span>(<\/span>\"Cannot divide by zero\"<\/span>.to_string<\/span>())<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> a<\/span>:<\/span> Result<\/span><<\/span>i32<\/span>,<\/span> String<\/span>><\/span> =<\/span> divide<\/span>(<\/span>1<\/span>,<\/span> 0<\/span>);<\/span>\r\n    println!<\/span>(<\/span>\"result: {}\"<\/span>,<\/span> a<\/span>.unwrap_or<\/span>(<\/span>-<\/span>1<\/span>));<\/span>\r\n\r\n    let<\/span> b<\/span>:<\/span> Result<\/span><<\/span>i32<\/span>,<\/span> String<\/span>><\/span> =<\/span> divide<\/span>(<\/span>10<\/span>,<\/span> 2<\/span>);<\/span>\r\n    println!<\/span>(<\/span>\"result: {}\"<\/span>,<\/span> b<\/span>.unwrap_or<\/span>(<\/span>-<\/span>1<\/span>));<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                    Ok\u306e\u5834\u5408\u3060\u3051\u95a2\u6570\u3092\u5b9f\u884c\u3057\u305f\u3044\u5834\u5408<\/h2>\n
                    and_then(function)\u3092\u4f7f\u3046function\u306f\u5225\u9014\u5b9a\u7fa9\u304c\u5fc5\u8981<\/p>\n
                    fn<\/span> divide<\/span>(<\/span>a<\/span>:<\/span> i32<\/span>,<\/span> b<\/span>:<\/span> i32<\/span>)<\/span> -><\/span> Result<\/span><<\/span>i32<\/span>,<\/span> String<\/span>><\/span> {<\/span>\r\n    if<\/span> b<\/span> !=<\/span> 0<\/span> {<\/span>\r\n        Ok<\/span>(<\/span>a<\/span> \/<\/span> b<\/span>)<\/span>\r\n    }<\/span> else<\/span> {<\/span>\r\n        Err<\/span>(<\/span>\"Cannot divide by zero\"<\/span>.to_string<\/span>())<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> func<\/span>(<\/span>result<\/span>:<\/span> i32<\/span>)<\/span> -><\/span> Result<\/span><<\/span>i32<\/span>,<\/span> String<\/span>><\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"code: {}\"<\/span>,<\/span> result<\/span>);<\/span>\r\n    Ok<\/span>(<\/span>result<\/span>)<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> a<\/span>:<\/span> Result<\/span><<\/span>i32<\/span>,<\/span> String<\/span>><\/span> =<\/span> divide<\/span>(<\/span>1<\/span>,<\/span> 0<\/span>);<\/span>\r\n    let<\/span> result_a<\/span> =<\/span> a<\/span>.and_then<\/span>(<\/span>func<\/span>);<\/span> \/\/ \u7d50\u679c\u306fOk\u306a\u306e\u3067func\u306f\u5b9f\u884c\u3055\u308c\u308b<\/span>\r\n\r\n    let<\/span> b<\/span>:<\/span> Result<\/span><<\/span>i32<\/span>,<\/span> String<\/span>><\/span> =<\/span> divide<\/span>(<\/span>10<\/span>,<\/span> 2<\/span>);<\/span>\r\n    let<\/span> result_b<\/span> =<\/span> b<\/span>.and_then<\/span>(<\/span>func<\/span>);<\/span> \/\/ \u7d50\u679c\u306fErr\u306a\u306e\u3067func\u306f\u5b9f\u884c\u3055\u308c\u306a\u3044<\/span>\r\n\r\n    println!<\/span>(<\/span>\"result_a: {:?}\"<\/span>,<\/span> result_a<\/span>);<\/span> \/\/ -> result_a: Err(\"Cannot divide by zero\")<\/span>\r\n    println!<\/span>(<\/span>\"result_b: {:?}\"<\/span>,<\/span> result_b<\/span>);<\/span> \/\/ -> result_b: Ok(5)<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                    \u30d9\u30af\u30bf\u578b<\/h1>\n
                    \u914d\u5217\u3068\u4f3c\u3066\u3044\u308b\u304c\u3001\u914d\u5217\u3068\u9055\u3044\u8981\u7d20\u306e\u6570\u3092\u5909\u66f4\u3067\u304d\u308b\u3002<\/p>\n
                    fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> mut<\/span> a<\/span>:<\/span> Vec<\/span><<\/span>i32<\/span>><\/span> =<\/span> [<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>]<\/span>.to_vec<\/span>();<\/span>\r\n    \/\/ let a: Vec<i32> = vec![1, 2, 3];  \u3067\u3082\u3088\u3044<\/span>\r\n    \/\/ let a: Vec<i32> = vec![0: 5]; \u3067\u8981\u7d20\u3068\u6570\u3092\u6307\u5b9a\u3057\u3066\u5b9a\u7fa9 -> [0, 0, 0, 0, 0]<\/span>\r\n    println!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> a<\/span>);<\/span>\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> a<\/span>[<\/span>0<\/span>]);<\/span>\r\n\r\n    a<\/span>.push<\/span>(<\/span>34<\/span>);<\/span> \/\/ \u672b\u5c3e\u306b\u8ffd\u52a0<\/span>\r\n    println!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> a<\/span>);<\/span>\r\n\r\n    a<\/span>.pop<\/span>();<\/span> \/\/ \u672b\u5c3e\u3092\u524a\u9664<\/span>\r\n    println!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> a<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                    \u305f\u3060\u3057\u8981\u7d20\u4ee5\u4e0a\u306e\u7bc4\u56f2\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u30d1\u30cb\u30c3\u30af\u3092\u8d77\u3053\u3059\u3002<\/p>\n
                    fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> a<\/span>:<\/span> Vec<\/span><<\/span>i32<\/span>><\/span> =<\/span> [<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>]<\/span>.to_vec<\/span>();<\/span>\r\n    \/\/ let a: Vec<i32> = vec![1, 2, 3];  \u3067\u3082\u3088\u3044<\/span>\r\n    \/\/ let a: Vec<i32> = vec![0: 5]; \u3067\u8981\u7d20\u3068\u6570\u3092\u6307\u5b9a\u3057\u3066\u5b9a\u7fa9 -> [0, 0, 0, 0, 0]<\/span>\r\n    println!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> a<\/span>);<\/span>\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> a<\/span>[<\/span>3<\/span>]);<\/span>\r\n}<\/span>\r\n\r\n\/\/ --- \u51fa\u529b\u7d50\u679c ---<\/span>\r\n\/\/ [1, 2, 3]<\/span>\r\n\/\/ thread 'main' panicked at 'index out of bounds: the len is 3 but the index is 3', src\/main.rs:10:20<\/span>\r\n\/\/ note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace<\/span>\r\n<\/code><\/pre>\n
                    Box\u578b<\/h1>\n
                    Box\u3092\u4f7f\u3046\u3068\u5024\u306f\u30d2\u30fc\u30d7\u9818\u57df\u306b\u78ba\u4fdd\u3055\u308c\u308b\u3002\u30d2\u30fc\u30d7\u9818\u57df\u306f\u78ba\u4fdd\u3057\u305f\u3044\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u5fc5\u8981\u9818\u57df\u3092\u78ba\u4fdd\u3059\u308b\u306e\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30b5\u30a4\u30ba\u304c\u5206\u304b\u3063\u3066\u3044\u306a\u304f\u3066\u3082\u554f\u984c\u306a\u3044\u3002<\/p>\n
                    Box\u306f\u30d2\u30fc\u30d7\u9818\u57df\u306b\u4efb\u610f\u306e\u578b\u3092\u683c\u7d0d\u3057\u3001\u30b9\u30bf\u30c3\u30af\u9818\u57df\u306b\u30d2\u30fc\u30d7\u9818\u57df\u3078\u306e\u30dd\u30a4\u30f3\u30bf\u3092\u7f6e\u304f\u3002<\/p>\n
                    \u3088\u3063\u3066\u3001\u6b21\u306e\u3088\u3046\u306a\u3053\u3068\u304c\u3067\u304d\u308b<\/p>\n
                      \n
                    • \n
                        \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30b5\u30a4\u30ba\u304c\u5206\u304b\u3089\u306a\u3044\u578b\u3092\u683c\u7d0d<\/ul>\n<\/li>\n<\/ul>\n
                         <\/p>\n
                          \n
                        • \n
                            \u5927\u304d\u306a\u30b5\u30a4\u30ba\u306e\u65b9\u306e\u5024\u3092\u6e21\u3059\u969b\u306b\u3001\u30c7\u30fc\u30bf\u306e\u4e2d\u8eab\u3092\u30b3\u30d4\u30fc\u305b\u305a\u3001\u30dd\u30a4\u30f3\u30bf\u3067\u6e21\u3059<\/ul>\n<\/li>\n<\/ul>\n
                             <\/p>\n
                              \u5171\u901a\u306e\u30c8\u30ec\u30a4\u30c8\u3092\u5b9f\u88c5\u3057\u305f\u69d8\u3005\u306a\u65b9\u3092\u753b\u4e00\u7684\u306b\u30dd\u30a4\u30f3\u30bf\u3067\u6271\u3046(\u3053\u308c\u306f\u610f\u5473\u308f\u304b\u3089\u3093)<\/ul>\n
                              fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> byte_array<\/span> =<\/span> [<\/span>b'h'<\/span>,<\/span> b'e'<\/span>,<\/span> b'l'<\/span>,<\/span> b'l'<\/span>,<\/span> b'o'<\/span>];<\/span>\r\n    print<\/span>(<\/span>Box<\/span>::<\/span>new<\/span>(<\/span>byte_array<\/span>));<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> print<\/span>(<\/span>s<\/span>:<\/span> Box<\/span><<\/span>[<\/span>u8<\/span>]<\/span>><\/span>)<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> s<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
                              \u30b3\u30fc\u30c9\u4e0a\u3067\u578b\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b\u306f\u4ee5\u4e0b\u306e\u95a2\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3067\u78ba\u8a8d\u3067\u304d\u308b fn print_typename< […]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45409","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\/45409-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"\u30b3\u30fc\u30c9\u4e0a\u3067\u578b\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b\u306f\u4ee5\u4e0b\u306e\u95a2\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3067\u78ba\u8a8d\u3067\u304d\u308b fn print_typename< […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45409-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-01-09T06:55:09+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-28T19:46:01+00:00\" \/>\n<meta name=\"author\" content=\"\u65b0, \u97f5\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u65b0, \u97f5\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/45409-2\/\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/45409-2\/\",\"name\":\"- Blog - Silicon Cloud\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#website\"},\"datePublished\":\"2024-01-09T06:55:09+00:00\",\"dateModified\":\"2024-04-28T19:46:01+00:00\",\"author\":{\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#\/schema\/person\/4ba4019495123db3038fd0809e6959c9\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.silicloud.com\/zh\/blog\/45409-2\/\"]}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/#website\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/\",\"name\":\"Blog - 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