{"id":45039,"date":"2023-12-12T05:10:48","date_gmt":"2024-03-10T09:01:56","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45039-2\/"},"modified":"2024-05-04T13:11:00","modified_gmt":"2024-05-04T05:11:00","slug":"45039-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45039-2\/","title":{"rendered":""},"content":{"rendered":"

\u306f\u3058\u3081\u306b<\/h1>\n

\u3069\u3046\u3082\u3001\u30ec\u30ac\u30b7\u30fc\u7d44\u8fbc\u307f\u30a8\u30f3\u30b8\u30cb\u30a2\u306e@yagisawa\u3067\u3059\u3002
\nRust\u3092\u52c9\u5f37\u3057\u3066\u3044\u308b\u3068C\u3067\u306f\u898b\u304b\u3051\u306a\u3044\u8a00\u8a9e\u4ed5\u69d8(\u4e3b\u306b\u8a18\u53f7\u306e\u4f7f\u3044\u65b9)\u306b\u51fa\u304f\u308f\u3059\u3053\u3068\u304c\u3042\u308b\u306e\u3067\u3001\u30c1\u30fc\u30c8\u30b7\u30fc\u30c8\u7684\u306a\u611f\u3058\u3067\u307e\u3068\u3081\u3066\u307f\u307e\u3057\u305f\u3002
\n\u52c9\u5f37\u304c\u9032\u307f\u6b21\u7b2c\u90fd\u5ea6\u66f4\u65b0\u3057\u3066\u3044\u304f\u4e88\u5b9a\u3067\u3059\u3002<\/p>\n

\n

\u300cRust\u3067\u306fXXX\u7b49\u306b\u4f7f\u3044\u307e\u3059\u300d\u3068\u66d6\u6627\u306a\u8868\u73fe\u3092\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u79c1\u306e\u52c9\u5f37\u304c\u8db3\u308a\u3066\u3044\u306a\u3044\u3060\u3051\u3067\u672c\u8a18\u4e8b\u3067\u7d39\u4ecb\u3057\u3066\u3044\u308b\u3082\u306e\u4ee5\u5916\u306e\u4f7f\u3044\u65b9\u3082\u5b58\u5728\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u65e8\u3001\u4e88\u3081\u3054\u627f\u77e5\u304a\u304d\u304f\u3060\u3055\u3044\u3002<\/p>\n<\/div>\n

\n

C\u306b\u3064\u3044\u3066\u3082\u79c1\u304c\u77e5\u3089\u306a\u3044\u4f7f\u3044\u65b9\u304c\u5b58\u5728\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u65e8\u3001\u4e88\u3081\u3054\u627f\u77e5\u304a\u304d\u304f\u3060\u3055\u3044\u3002\u4ed5\u4e8b\u67c4C89\u306e\u4ed5\u69d8\u3092\u4e3b\u306b\u6271\u3063\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u672c\u8a18\u4e8b\u306e\u4e3b\u773c\u306fRust\u3067\u3042\u308b\u305f\u3081\u3001C\u306e\u60c5\u5831\u306e\u5145\u5b9f\u5ea6\u306b\u3064\u3044\u3066\u306f\u672c\u8cea\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<\/div>\n

Rust\u3068C\u306e\u8a18\u53f7\u306e\u4e00\u89a7\u306f\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3092\u53c2\u8003\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

 <\/p>\n

\u8a18\u53f7<\/h1>\n

!<\/h2>\n

C\u3067\u306f\u8ad6\u7406\u5426\u5b9a \u975e\u7b49\u4fa1\u6bd4\u8f03\u7b49\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n

\/\/ \u8ad6\u7406\u5426\u5b9a<\/span>\r\nflg<\/span> =<\/span> !<\/span>flg<\/span>;<\/span>\r\n\r\n\/\/ \u975e\u7b49\u4fa1\u6f14\u7b97<\/span>\r\nif<\/span> (<\/span> flg<\/span> !=<\/span> false<\/span> )<\/span> {<\/span> ...<\/span> }<\/span>\r\n<\/code><\/pre>\n
Rust\u3067\u306f\u8ad6\u7406\u5426\u5b9a \u975e\u7b49\u4fa1\u6bd4\u8f03\u306e\u4ed6\u3001\u30d3\u30c3\u30c8\u53cd\u8ee2 \u30de\u30af\u30ed\u5c55\u958b never\u578b\u7b49\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
\u30d3\u30c3\u30c8\u53cd\u8ee2<\/h3>\n
Rust\u306e\u30d3\u30c3\u30c8\u53cd\u8ee2\u306f~\u3067\u306f\u306a\u304f!\u3067\u3059\u3002
\nC\u30e6\u30fc\u30b6\u304c\u30c9\u30cf\u30de\u308a\u3057\u305d\u3046\u306a\u30dd\u30a4\u30f3\u30c8\u3067<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span>:<\/span> u32<\/span> =<\/span> !<\/span>0x55555555<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"{:X}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u306e\u7d50\u679c\u306f0\u3067\u306f\u306a\u304f0xAAAAAAAA\u306b\u306a\u308a\u307e\u3059\u3002
\nbool\u578b\u3060\u3068\u8ad6\u7406\u5426\u5b9a\u306b\u306a\u308b\u306e\u3067\u3001C\u306e\u3088\u3046\u306b\u6574\u6570\u578b\u3068boot\u578b\u3092\u4e00\u7dd2\u304f\u305f\u306b\u8003\u3048\u306a\u3044\u3088\u3046\u306b\u6ce8\u610f\u3057\u305f\u3044\u3068\u3053\u308d\u3067\u3059\u3002<\/p>\n
\u30de\u30af\u30ed\u5c55\u958b<\/h3>\n
Rust\u306e\u30de\u30af\u30ed\u306f\u3081\u3061\u3083\u304f\u3061\u3083\u96e3\u3057\u3044\u306e\u3067\u3068\u308a\u3042\u3048\u305aC\u30e6\u30fc\u30b6\u306b\u99b4\u67d3\u307f\u304c\u3042\u308a\u305d\u3046\u306a\u4f8b\u3092\u3002<\/p>\n
macro_rules!<\/span> abs<\/span> {<\/span>\r\n    (<\/span>$e<\/span>:<\/span> expr<\/span>)<\/span> =><\/span> (<\/span>if<\/span> $e<\/span> <<\/span> 0<\/span> {<\/span>-<\/span>$e<\/span>}<\/span> else<\/span> {<\/span>$e<\/span>})<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> ret<\/span> =<\/span> abs!<\/span>(<\/span>-<\/span>2<\/span>);<\/span>\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> ret<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
abs\u3068\u3044\u3046\u304a\u99b4\u67d3\u307f(\uff1f)\u306e\u30de\u30af\u30ed\u3092\u4f5c\u3063\u3066\u307f\u307e\u3057\u305f\u3002\u305d\u306e\u30de\u30af\u30ed\u3092\u5c55\u958b\u3059\u308b\u306b\u306fabs!\u3068\u66f8\u304d\u307e\u3059\u3002
\n\u304a\u6c17\u4ed8\u304d\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001Rust\u306f\u6a19\u6e96\u51fa\u529b\u51e6\u7406\u3082\u30de\u30af\u30ed\u3067\u3059\u3002<\/p>\n
\u30de\u30af\u30ed\u306e\u8a73\u7d30\u3092\u77e5\u308a\u305f\u3044\u65b9\u306f\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3092\u3054\u53c2\u8003\u304f\u3060\u3055\u3044(\u3068\u3044\u3046\u304b\u3001\u3053\u308c\u898b\u3066\u79c1\u3082\u52c9\u5f37\u3057\u307e\u3059\u2026)\u3002<\/p>\n
 <\/p>\n
never\u578b<\/h3>\n
Rust\u3067\u306f\u95a2\u6570\u306e\u623b\u308a\u5024\u306b\u5024\u3092\u4f55\u3082\u8fd4\u3055\u306a\u3044(\u3064\u307e\u308a\u3001\u6c7a\u3057\u3066return\u3057\u306a\u3044)\u3053\u3068\u3092<\/p>\n
fn<\/span> never_return<\/span>()<\/span> -><\/span> !<\/span> {<\/span>\r\n    loop<\/span> {}<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    never_return<\/span>();<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u306e\u3088\u3046\u306b\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
:<\/h2>\n
C\u3067\u306f\u4e09\u9805\u6f14\u7b97\u5b50 \u30e9\u30d9\u30eb\u7b49\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
\/\/ \u4e09\u9805\u6f14\u7b97\u5b50<\/span>\r\nmax<\/span> =<\/span> (<\/span>val1<\/span> ><\/span> val2<\/span>)<\/span> ?<\/span> val1<\/span> :<\/span> val2<\/span>;<\/span>\r\n\r\n\/\/ \u30e9\u30d9\u30eb<\/span>\r\nswitch<\/span> (<\/span> operator<\/span> )<\/span> {<\/span>\r\n    case<\/span> ADD<\/span>:<\/span> result<\/span> =<\/span> val1<\/span> +<\/span> val2<\/span>;<\/span> break<\/span>;<\/span>\r\n    case<\/span> SUB<\/span>:<\/span> result<\/span> =<\/span> val1<\/span> -<\/span> val2<\/span>;<\/span> break<\/span>;<\/span>\r\n    case<\/span> MUL<\/span>:<\/span> result<\/span> =<\/span> val1<\/span> *<\/span> val2<\/span>;<\/span> break<\/span>;<\/span>\r\n    case<\/span> DIV<\/span>:<\/span> result<\/span> =<\/span> val1<\/span> \/<\/span> val2<\/span>;<\/span> break<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Rust\u3067\u306f\u30e9\u30d9\u30eb\u306e\u4ed6\u3001\u578b\u5236\u7d04 \u69cb\u9020\u4f53\u30d5\u30a3\u30fc\u30eb\u30c9\u521d\u671f\u5316\u5b50\u7b49\u306b\u4f7f\u3044\u307e\u3059\u3002
\n\u307e\u305fRust\u306e\u30e9\u30d9\u30eb\u306f\u30eb\u30fc\u30d7\u30e9\u30d9\u30eb\u306b\u9650\u5b9a\u3055\u308c\u3066\u304a\u308a\u3001C\u306e\u3088\u3046\u306bgoto\u3092\u4f7f\u3063\u3066\u597d\u304d\u306a\u3068\u3053\u308d\u306b\u30b8\u30e3\u30f3\u30d7\u3057\u305f\u308a\u7b49\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u8a73\u7d30\u306f\u30eb\u30fc\u30d7\u30e9\u30d9\u30eb\u306b\u8a18\u8f09\u3057\u307e\u3059\u3002
\n\u4f59\u8ac7\u3067\u3059\u304c\u3001Rust\u306b\u4e09\u9805\u6f14\u7b97\u5b50\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
\u578b\u5236\u7d04<\/h3>\n
\u308f\u304b\u308a\u3084\u3059\u3044\u4f8b\u3060\u3068\u5909\u6570\u5ba3\u8a00\u3059\u308b\u3068\u304d\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span>:<\/span> u32<\/span> =<\/span> 1024<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3061\u306a\u307f\u306bRust\u306b\u306f\u578b\u63a8\u8ad6\u304c\u3042\u308b\u305f\u3081\u3001<\/p>\n
fn<\/span> print_type_of<\/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> x<\/span> =<\/span> 1024<\/span>;<\/span>\r\n    print_type_of<\/span>(<\/span>x<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u306e\u3088\u3046\u306b\u578b\u3092\u66f8\u304b\u306a\u304f\u3066\u3082\u5909\u6570\u5ba3\u8a00\u3067\u304d\u307e\u3059(\u79c1\u306e\u5b9f\u884c\u74b0\u5883\u3067\u306fi32\u306b\u306a\u308a\u307e\u3057\u305f)\u3002<\/p>\n
\u4f59\u8ac7\u3067\u3059\u304cRust\u306f\u8ce2\u3044\u306e\u3067\u3001<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span>:<\/span> u8<\/span> =<\/span> 1024<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u3093\u306a\u4e8b\u3059\u308b\u3068<\/p>\n
error: literal out of range for `u8`\r\n --> Main.rs:2:17\r\n  |\r\n2 |     let x: u8 = 1024;\r\n  |                 ^^^^\r\n  |\r\n  = note: `#[deny(overflowing_literals)]` on by default\r\n  = note: the literal `1024` does not fit into the type `u8` whose range is `0..=255`\r\n\r\nerror: aborting due to previous error\r\n<\/code><\/pre>\n
\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u69cb\u9020\u4f53\u30d5\u30a3\u30fc\u30eb\u30c9\u521d\u671f\u5316\u5b50<\/h3>\n
struct<\/span> Point<\/span> {<\/span>\r\n    x<\/span>:<\/span> i32<\/span>,<\/span>\r\n    y<\/span>:<\/span> i32<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> origin<\/span> =<\/span> Point<\/span> {<\/span>x<\/span>:<\/span> 0<\/span>,<\/span> y<\/span>:<\/span> 0<\/span>};<\/span>\r\n    println!<\/span>(<\/span>\"x = {}, y = {}\"<\/span>,<\/span> origin<\/span>.x<\/span>,<\/span> origin<\/span>.y<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
origin\u3068\u3044\u3046Point\u578b\u306e\u5909\u6570\u3092\u521d\u671f\u5316\u3059\u308b\u3068\u304d\u3053\u306e\u3088\u3046\u306b\u66f8\u304d\u307e\u3059\u3002<\/p>\n
;<\/h2>\n
C\u3067\u306f\u6587\u306e\u7d42\u7aef\u5b50\u3050\u3089\u3044\u306b\u3057\u304b\u4f7f\u308f\u306a\u3044\u3068\u601d\u3044\u307e\u3059\u304c\u3001Rust\u3067\u306f\u7d42\u7aef\u5b50\u306e\u4ed6\u306b\u56fa\u5b9a\u9577\u914d\u5217\u8a18\u6cd5\u306e\u4e00\u90e8\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n
\u56fa\u5b9a\u9577\u914d\u5217\u8a18\u6cd5<\/h3>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> a1<\/span>:<\/span> [<\/span>i32<\/span>;<\/span> 5<\/span>]<\/span> =<\/span> [<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>];<\/span>\r\n    println!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> a1<\/span>);<\/span>\r\n    \r\n    let<\/span> a2<\/span> =<\/span> [<\/span>100<\/span>;<\/span> 5<\/span>];<\/span>\r\n    println!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> a2<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u56fa\u5b9a\u9577\u914d\u5217\u306e\u5ba3\u8a00\u53ca\u3073\u521d\u671f\u5316\u3092\u3059\u308b\u3068\u304d\u3053\u306e\u3088\u3046\u306b\u66f8\u304d\u307e\u3059\u3002
\na1\u306f\u578b\u5236\u7d04\u3092\u4f7f\u3063\u3066\u914d\u5217\u306e\u578b\u3068\u30b5\u30a4\u30ba\u3092\u660e\u793a\u3057\u3066\u3044\u307e\u3059\u3002
\na2\u306f\u5168\u3066\u306e\u8981\u7d20\u3092100\u3067\u521d\u671f\u5316\u3057\u3066\u3044\u307e\u3059\u3002a2\u306e\u578b\u306f\u6307\u5b9a\u3057\u3066\u3044\u307e\u305b\u3093\u304c\u3001\u53f3\u8fba\u5024\u3088\u308a\u578b\u3068\u30b5\u30a4\u30ba\u304c\u63a8\u8ad6\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
‘<\/h2>\n
C\u3067\u306f\u6587\u5b57\u3050\u3089\u3044\u306b\u3057\u304b\u4f7f\u308f\u306a\u3044\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n
char<\/span> c<\/span> =<\/span> 'a'<\/span>;<\/span>\r\n<\/code><\/pre>\n
Rust\u3067\u306f\u6587\u5b57\u306e\u4ed6\u3001\u30eb\u30fc\u30d7\u30e9\u30d9\u30eb \u540d\u524d\u4ed8\u304d\u306e\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0\u7b49\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
\u30eb\u30fc\u30d7\u30e9\u30d9\u30eb<\/h3>\n
Rust\u3067\u306ffor while loop\u7b49\u306e\u30eb\u30fc\u30d7\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u304c\u3001\u305d\u308c\u3089\u306b<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> mut<\/span> tbl<\/span> =<\/span> [[<\/span>0<\/span>;<\/span> 3<\/span>];<\/span> 3<\/span>];<\/span>\r\n    tbl<\/span>[<\/span>1<\/span>][<\/span>2<\/span>]<\/span> =<\/span> 10<\/span>;<\/span>\r\n\r\n    'escape_label<\/span>:<\/span> for<\/span> ary<\/span> in<\/span> tbl<\/span> {<\/span>\r\n        for<\/span> val<\/span> in<\/span> ary<\/span> {<\/span>\r\n            println!<\/span>(<\/span>\"search!\"<\/span>);<\/span>\r\n            if<\/span> val<\/span> !=<\/span> 0<\/span> {<\/span> break<\/span> 'escape_label<\/span>;<\/span> }<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n    \r\n    println!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> tbl<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u306e\u3088\u3046\u306b\u30e9\u30d9\u30eb\u3092\u4ed8\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u3057\u3066break\u3067\u30e9\u30d9\u30eb\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u591a\u91cd\u30eb\u30fc\u30d7\u3092\u4e00\u6c17\u306b\u629c\u3051\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4fbf\u5229\u3067\u3059\u3002<\/p>\n
\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0<\/h3>\n
C\u30e6\u30fc\u30b6\u306b\u306f\u3088\u304f\u308f\u304b\u3089\u306a\u3044\u6982\u5ff5\u3060\u3068\u601d\u3044\u307e\u3059\u306e\u3067\u307e\u305aC\u306e\u4f8b\u3092\u3002<\/p>\n
#include<\/span> <stdio.h><\/span>\r\n\r\nint<\/span> *<\/span>max<\/span>(<\/span> int<\/span> *<\/span>val1<\/span>,<\/span> int<\/span> *<\/span>val2<\/span> )<\/span> {<\/span>\r\n    return<\/span> (<\/span>*<\/span>val1<\/span> ><\/span> *<\/span>val2<\/span>)<\/span> ?<\/span> val1<\/span> :<\/span> val2<\/span>;<\/span>\r\n}<\/span>\r\n\r\nint<\/span> main<\/span>(<\/span> void<\/span> )<\/span> {<\/span>\r\n    int<\/span> x<\/span> =<\/span> 1<\/span>;<\/span>\r\n    int<\/span> *<\/span>result<\/span>;<\/span>\r\n    \r\n    {<\/span>\r\n        int<\/span> y<\/span> =<\/span> 10<\/span>;<\/span>\r\n        result<\/span> =<\/span> max<\/span>(<\/span>&<\/span>x<\/span>,<\/span> &<\/span>y<\/span>);<\/span>\r\n    }<\/span>\r\n    \r\n    printf<\/span>(<\/span>\"%d<\/span>\\n<\/span>\"<\/span>,<\/span> *<\/span>result<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
C\u306f\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u666e\u901a\u306b\u30d3\u30eb\u30c9\u3082\u3067\u304d\u308b\u3057\u5b9f\u884c\u3082\u3067\u304d\u3066\u3057\u307e\u3044\u307e\u3059\u3002
\n\u51fa\u529b\u7d50\u679c\u306f\u305f\u307e\u305f\u307e\u6b63\u3057\u304b\u3063\u305f\u306e\u3067\u3059\u304c\u3001max\u5185\u3067\u306f(y\u306e\u5024\u306e\u65b9\u304c\u5927\u304d\u3044\u305f\u3081)y\u306e\u30dd\u30a4\u30f3\u30bf\u304creturn\u3055\u308cresult\u306b\u4ee3\u5165\u3055\u308c\u308b\u306e\u3067\u3001printf\u3059\u308b\u3068\u304dresult\u306e\u53c2\u7167\u5148\u306f\u30b9\u30b3\u30fc\u30d7\u5916\u306e\u306f\u305a\u3067\u3059\u3002\u8a66\u3057\u306bprintf(“%d %d\\n”, *result, y);\u3068\u3057\u3066\u307f\u308b\u3068\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
Rust\u3067\u3082\u540c\u3058\u3088\u3046\u306a\u3053\u3068\u3092\u3057\u3066\u307f\u308b\u3068<\/p>\n
fn<\/span> max<\/span>(<\/span> val1<\/span>:<\/span> &<\/span>i32<\/span>,<\/span> val2<\/span>:<\/span> &<\/span>i32<\/span> )<\/span> -><\/span> &<\/span>i32<\/span> {<\/span>\r\n    return<\/span> if<\/span> *<\/span>val1<\/span> ><\/span> *<\/span>val2<\/span> {<\/span> val1<\/span> }<\/span> else<\/span> {<\/span> val2<\/span> };<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span> =<\/span> 1<\/span>;<\/span>\r\n    let<\/span> result<\/span>;<\/span>\r\n    \r\n    {<\/span>\r\n        let<\/span> y<\/span> =<\/span> 10<\/span>;<\/span>\r\n        result<\/span> =<\/span> max<\/span>(<\/span>&<\/span>x<\/span>,<\/span> &<\/span>y<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> result<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
error[E0106]: missing lifetime specifier\r\n --> Main.rs:1:37\r\n  |\r\n1 | fn max( val1: &i32, val2: &i32 ) -> &i32 {\r\n  |               ----        ----      ^ expected named lifetime parameter\r\n  |\r\n  = help: this function's return type contains a borrowed value, but the signature does not say whether it is borrowed from `val1` or `val2`\r\nhelp: consider introducing a named lifetime parameter\r\n  |\r\n1 | fn max<'a>( val1: &'a i32, val2: &'a i32 ) -> &'a i32 {\r\n  |       ++++         ++             ++           ++\r\n\r\nerror: aborting due to previous error\r\n\r\nFor more information about this error, try `rustc --explain E0106`.\r\n<\/code><\/pre>\n
\u300c\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0\u6307\u5b9a\u5b50\u306e\u6b20\u843d\u300d\u3068\u8a00\u308f\u308c\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002
\n\u4f8b\u306b\u3042\u308b\u3088\u3046\u306b\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u8ffd\u52a0\u3059\u308b\u3068<\/p>\n
fn<\/span> max<\/span><<\/span>'a<\/span>><\/span>(<\/span> val1<\/span>:<\/span> &<\/span>'a<\/span> i32<\/span>,<\/span> val2<\/span>:<\/span> &<\/span>'a<\/span> i32<\/span> )<\/span> -><\/span> &<\/span>'a<\/span> i32<\/span> {<\/span>\r\n    return<\/span> if<\/span> *<\/span>val1<\/span> ><\/span> *<\/span>val2<\/span> {<\/span> val1<\/span> }<\/span> else<\/span> {<\/span> val2<\/span> };<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span> =<\/span> 1<\/span>;<\/span>\r\n    let<\/span> result<\/span>;<\/span>\r\n    \r\n    {<\/span>\r\n        let<\/span> y<\/span> =<\/span> 10<\/span>;<\/span>\r\n        result<\/span> =<\/span> max<\/span>(<\/span>&<\/span>x<\/span>,<\/span> &<\/span>y<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> result<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
error[E0597]: `y` does not live long enough\r\n  --> Main.rs:11:26\r\n   |\r\n11 |         result = max(&x, &y);\r\n   |                          ^^ borrowed value does not live long enough\r\n12 |     }\r\n   |     - `y` dropped here while still borrowed\r\n13 | \r\n14 |     println!(\"{}\", result);\r\n   |                    ------ borrow later used here\r\n\r\nerror: aborting due to previous error\r\n\r\nFor more information about this error, try `rustc --explain E0597`.\r\n<\/code><\/pre>\n
\u4eca\u5ea6\u306f\u300c`y`\u306f\u9577\u751f\u304d\u3067\u304d\u306a\u3044\u300d\u3068\u3044\u3046\u30a8\u30e9\u30fc\u306b\u5909\u308f\u308a\u307e\u3057\u305f\u3002
\n\u5168\u3066\u306e\u5f15\u6570\u3068\u623b\u308a\u5024\u306b’a\u3092\u3064\u3051\u307e\u3057\u305f\u304c\u3001\u3053\u308c\u306f\u300c\u5168\u3066\u306e\u5f15\u6570\u3068\u623b\u308a\u5024\u306f\u540c\u3058\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0’a\u3092\u6301\u3064\u300d\u3068\u3044\u3046\u610f\u5473\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u30812\u3064\u306e\u5f15\u6570\u306e\u3046\u3061\u77ed\u3044\u65b9\u306e\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0(\u3053\u306e\u4f8b\u3067\u306fy\u306e\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0)\u304c\u623b\u308a\u5024\u306b\u3082\u9069\u7528\u3055\u308c\u3001\u30a8\u30e9\u30fc\u3068\u306a\u3063\u305f\u308f\u3051\u3067\u3059\u3002<\/p>\n
\u88dc\u8db3\u3067\u3059\u304c\u30cd\u30c3\u30c8\u4e0a\u306e\u4f8b\u3067\u306f\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0\u306b\u5927\u4f53’a ‘b ‘static\u8fba\u308a\u304c\u4f7f\u308f\u308c\u3066\u3044\u308b\u3068\u601d\u3044\u307e\u3059\u3002’static\u306f\u300c\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u9650\u308a\u6709\u52b9\u306a\u5024\u3078\u306e\u53c2\u7167\u300d\u3064\u307e\u308a\u6700\u5927\u306e\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0\u3092\u8868\u3059\u7279\u5225\u306a\u610f\u5473\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u304c\u3001\u305d\u308c\u4ee5\u5916\u306b\u3064\u3044\u3066\u306f\u3069\u3093\u306a\u540d\u524d\u3067\u3082\u554f\u984c\u306a\u3044\u3088\u3046\u3067\u3059\u3002
\n\u3064\u307e\u308a<\/p>\n
fn<\/span> max<\/span><<\/span>'shortest_lifetime<\/span>><\/span>(<\/span> val1<\/span>:<\/span> &<\/span>'shortest_lifetime<\/span> i32<\/span>,<\/span> val2<\/span>:<\/span> &<\/span>'shortest_lifetime<\/span> i32<\/span> )<\/span> -><\/span> &<\/span>'shortest_lifetime<\/span> i32<\/span> {<\/span>\r\n    return<\/span> if<\/span> *<\/span>val1<\/span> ><\/span> *<\/span>val2<\/span> {<\/span> val1<\/span> }<\/span> else<\/span> {<\/span> val2<\/span> };<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u3067\u3082\u5927\u4e08\u592b\u3067\u3059\u3002
\n\u6d41\u77f3\u306b\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u30c0\u30e1\u3067\u3057\u305f\u304c\u3001’i32\u3068\u304b\u306f\u3044\u3051\u307e\u3057\u305f\u3002<\/p>\n
_<\/h2>\n
C\u3067\u306f\u5909\u6570\u30fb\u95a2\u6570\u540d\u7b49\u3092\u30b9\u30cd\u30fc\u30af\u30b1\u30fc\u30b9\u3067\u66f8\u304f\u3068\u304d\u3050\u3089\u3044\u306b\u3057\u304b\u4f7f\u308f\u306a\u3044\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n
int<\/span> some_val<\/span> =<\/span> 123<\/span>;<\/span>\r\n<\/code><\/pre>\n
Rust\u3067\u306f\u5909\u6570\u30fb\u95a2\u6570\u540d\u7b49\u306e\u4ed6\u306b\u3001\u300c\u7121\u8996\u300d\u30d1\u30bf\u30fc\u30f3\u675f\u7e1b \u6574\u6570\u30ea\u30c6\u30e9\u30eb\u7b49\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
\u300c\u7121\u8996\u300d\u30d1\u30bf\u30fc\u30f3\u675f\u7e1b<\/h3>\n
\u8272\u3005\u306a\u30d1\u30bf\u30fc\u30f3\u304c\u3042\u308b\u306e\u3067\u3059\u304c<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span> =<\/span> 10<\/span>;<\/span>\r\n\r\n    match<\/span> x<\/span> {<\/span>\r\n        0<\/span> =><\/span> println!<\/span>(<\/span>\"x is 0.\"<\/span>),<\/span>\r\n        1<\/span> =><\/span> println!<\/span>(<\/span>\"x is 1.\"<\/span>),<\/span>\r\n        _<\/span> =><\/span> println!<\/span>(<\/span>\"x is other.\"<\/span>)<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u307e\u305amatch\u5f0f\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002switch\u6587\u306edefault\u306e\u3088\u3046\u306a\u611f\u3058\u3067\u3059\u3002<\/p>\n
fn<\/span> foo<\/span>(<\/span>_<\/span>:<\/span> i32<\/span>)<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"\u7e70\u308a\u8fd4\u3059\u3060\u3051\"<\/span>);<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span> =<\/span> [<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>];<\/span>\r\n\r\n    for<\/span> _<\/span> in<\/span> x<\/span> {<\/span>\r\n        foo<\/span>(<\/span>0<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6b21\u306b\u3053\u3093\u306a\u611f\u3058\u3067for\u3084\u5f15\u6570\u306e\u5024\u5168\u4f53\u3092\u7121\u8996\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span>         =<\/span> 10<\/span>;<\/span>\r\n    let<\/span> warn<\/span>      =<\/span> 20<\/span>;<\/span>\r\n    let<\/span> _not_warn<\/span> =<\/span> 30<\/span>;<\/span>\r\n\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u305d\u308c\u304b\u3089Rust\u306f\u672a\u4f7f\u7528\u5909\u6570\u306b\u5bfe\u3057\u3066\u30ef\u30fc\u30cb\u30f3\u30b0\u3092\u51fa\u3059\u306e\u3067\u3059\u304c\u3001\u5909\u6570\u540d\u306e\u5148\u982d\u306b_\u3092\u4ed8\u3051\u3066\u3044\u308b\u3068\u672a\u4f7f\u7528\u3067\u3082\u30ef\u30fc\u30cb\u30f3\u30b0\u304c\u51fa\u307e\u305b\u3093\u3002<\/p>\n
\u6574\u6570\u30ea\u30c6\u30e9\u30eb<\/h3>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> a<\/span>      =<\/span> 1_000_000<\/span>;<\/span>\r\n    let<\/span> b<\/span>:<\/span> u32<\/span> =<\/span> 0x8000_FFFA<\/span>;<\/span>\r\n\r\n    println!<\/span>(<\/span>\"{}, {:X}\"<\/span>,<\/span> a<\/span>,<\/span> b<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u306e\u3088\u3046\u306b\u6574\u6570\u30ea\u30c6\u30e9\u30eb\u3092_\u3067\u533a\u5207\u3063\u3066\u898b\u3084\u3059\u304f\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
@<\/h2>\n
C\u3067\u306f\u305d\u3082\u305d\u3082\u4f7f\u308f\u306a\u3044\u3068\u601d\u3044\u307e\u3059\u304c\u3001Rust\u3067\u306f\u30d1\u30bf\u30fc\u30f3\u675f\u7e1b\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
\u30d1\u30bf\u30fc\u30f3\u675f\u7e1b<\/h3>\n
\u306a\u3093\u3067\u3053\u3093\u306a\u4ed5\u69d8\u306b\u3057\u305f\u306e\u304b\u2026\u79c1\u304c\u30b9\u30c3\u30ad\u30ea\u3057\u3066\u3044\u306a\u3044\u306e\u3067\u3046\u307e\u304f\u8aac\u660e\u3067\u304d\u307e\u305b\u3093\u304c\u3002
\n\u307e\u305a\u3053\u308c\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u306fRust\u306eenum\u3068match\u5f0f\u306b\u3064\u3044\u3066\u3056\u3063\u304f\u308a\u7406\u89e3\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
Rust\u306eenum\u306f<\/p>\n
enum<\/span> IpAddr<\/span> {<\/span>\r\n    V4<\/span> {<\/span> a1<\/span>:<\/span> u8<\/span>,<\/span>  a2<\/span>:<\/span> u8<\/span>,<\/span>  a3<\/span>:<\/span> u8<\/span>,<\/span>  a4<\/span>:<\/span> u8<\/span> },<\/span>\r\n    V6<\/span> {<\/span> a<\/span>:<\/span> String<\/span> }<\/span>\r\n}<\/span>\r\n\r\nlet<\/span> ip<\/span> =<\/span> IpAddr<\/span>::<\/span>V4<\/span> {<\/span> a1<\/span>:<\/span> 192<\/span>,<\/span> a2<\/span>:<\/span> 168<\/span>,<\/span> a3<\/span>:<\/span> 0<\/span>,<\/span> a4<\/span>:<\/span> 1<\/span> };<\/span>\r\n<\/code><\/pre>\n
\u306e\u3088\u3046\u306b\u5217\u6319\u5b50\u306b\u30c7\u30fc\u30bf\u3092\u6301\u305f\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
\n\u305d\u3057\u3066<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    enum<\/span> IpAddr<\/span> {<\/span>\r\n        V4<\/span> {<\/span> a1<\/span>:<\/span> u8<\/span>,<\/span>  a2<\/span>:<\/span> u8<\/span>,<\/span>  a3<\/span>:<\/span> u8<\/span>,<\/span>  a4<\/span>:<\/span> u8<\/span> },<\/span>\r\n        V6<\/span> {<\/span> a<\/span>:<\/span> String<\/span> }<\/span>\r\n    }<\/span>\r\n    \r\n    let<\/span> ip<\/span> =<\/span> IpAddr<\/span>::<\/span>V4<\/span> {<\/span> a1<\/span>:<\/span> 192<\/span>,<\/span> a2<\/span>:<\/span> 168<\/span>,<\/span> a3<\/span>:<\/span> 0<\/span>,<\/span> a4<\/span>:<\/span> 1<\/span> };<\/span>\r\n\r\n    match<\/span> ip<\/span> {<\/span>\r\n        IpAddr<\/span>::<\/span>V4<\/span> {<\/span> a1<\/span>:<\/span> 0<\/span>..=<\/span>127<\/span>,<\/span> a2<\/span>,<\/span> a3<\/span>,<\/span> a4<\/span> }<\/span> =><\/span> {<\/span>\r\n            println!<\/span>(<\/span>\"\u30af\u30e9\u30b9A\u3067\u3059\"<\/span>)<\/span>\r\n        },<\/span>\r\n        IpAddr<\/span>::<\/span>V4<\/span> {<\/span> a1<\/span>:<\/span> n<\/span> @<\/span> 192<\/span>..=<\/span>223<\/span>,<\/span> a2<\/span>,<\/span> a3<\/span>,<\/span> a4<\/span> }<\/span> =><\/span> {<\/span>\r\n            println!<\/span>(<\/span>\"{}.{}.{}.{}\u306f\u30af\u30e9\u30b9C\u306eV4\u30a2\u30c9\u30ec\u30b9\u3067\u3059\"<\/span>,<\/span> n<\/span>,<\/span> a2<\/span>,<\/span> a3<\/span>,<\/span> a4<\/span>)<\/span>\r\n        },<\/span>\r\n        IpAddr<\/span>::<\/span>V4<\/span> {<\/span> a1<\/span>,<\/span> a2<\/span>,<\/span> a3<\/span>,<\/span> a4<\/span> }<\/span> =><\/span> {<\/span>\r\n            println!<\/span>(<\/span>\"{}.{}.{}.{}\u306fV4\u30a2\u30c9\u30ec\u30b9\u3067\u3059\"<\/span>,<\/span> a1<\/span>,<\/span> a2<\/span>,<\/span> a3<\/span>,<\/span> a4<\/span>)<\/span>\r\n        },<\/span>\r\n        IpAddr<\/span>::<\/span>V6<\/span> {<\/span> a<\/span> }<\/span> =><\/span> {<\/span>\r\n            println!<\/span>(<\/span>\"{}\u306fV6\u30a2\u30c9\u30ec\u30b9\u3067\u3059\"<\/span>,<\/span> a<\/span>)<\/span>\r\n        },<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u306e\u3088\u3046\u306bmatch\u5f0f\u3067ip\u304c\u3069\u306e\u30d1\u30bf\u30fc\u30f3\u306b\u30de\u30c3\u30c1\u3059\u308b\u304b\u306b\u3088\u3063\u3066\u51e6\u7406\u3092\u5909\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
\n\u3053\u306e\u3068\u304d<\/p>\n
IpAddr<\/span>::<\/span>V6<\/span> {<\/span> a<\/span> }<\/span> =><\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"{}\u306fV6\u30a2\u30c9\u30ec\u30b9\u3067\u3059\"<\/span>,<\/span> a<\/span>)<\/span>\r\n},<\/span>\r\n<\/code><\/pre>\n
\u306e\u3088\u3046\u306b\u66f8\u304f\u3068IpAddr::V6\u306e\u4e2d\u306b\u3042\u308b\u30c7\u30fc\u30bf\u3092\u30ed\u30fc\u30ab\u30eb\u5909\u6570a\u306b\u4ee3\u5165\u3057\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u4e2d\u306b\u3042\u308b\u30c7\u30fc\u30bf\u306b\u95a2\u4fc2\u306a\u304f\u5168\u3066\u306eIpAddr::V6\u304c\u30de\u30c3\u30c1\u3057\u307e\u3059\u3002
\n\u4e2d\u306b\u3042\u308b\u30c7\u30fc\u30bf\u3082\u8003\u616e\u3057\u3066\u30de\u30c3\u30c1\u3055\u305b\u305f\u3044\u3068\u304d\u306f<\/p>\n
IpAddr<\/span>::<\/span>V4<\/span> {<\/span> a1<\/span>:<\/span> 0<\/span>..=<\/span>127<\/span>,<\/span> a2<\/span>,<\/span> a3<\/span>,<\/span> a4<\/span> }<\/span> =><\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"\u30af\u30e9\u30b9A\u3067\u3059\"<\/span>)<\/span>\r\n},<\/span>\r\n<\/code><\/pre>\n
\u306e\u3088\u3046\u306ba1\u306e\u7bc4\u56f2\u66f8\u3044\u3066\u3042\u3052\u308b\u306e\u3067\u3059\u304c\u3001a1: 0..=127\u306e\u90e8\u5206\u306f\u300ca1\u306e\u7bc4\u56f2\u304c0\uff5e127\u306e\u3082\u306e\u300d\u3068\u3044\u3046\u610f\u5473\u3060\u3051\u3067a1\u3068\u3044\u3046\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3092\u5ba3\u8a00\u3057\u305f\u3053\u3068\u306b\u306f\u306a\u3063\u3066\u3044\u307e\u305b\u3093\u3002\u5f8c\u7d9a\u306ea2 – a4\u306f\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3068\u3057\u3066\u4f7f\u7528\u3067\u304d\u308b\u306e\u3067\u3059\u304c\u2026
\n\u305d\u306e\u305f\u3081\u300ca1\u306e\u5024\u3082\u5909\u6570\u306b\u4ee3\u5165\u3057\u3066\u4f7f\u3044\u305f\u3044\u3088\uff01\u300d\u3068\u3044\u3046\u5834\u5408\u306f@\u3092\u4f7f\u3063\u3066<\/p>\n
IpAddr<\/span>::<\/span>V4<\/span> {<\/span> a1<\/span>:<\/span> n<\/span> @<\/span> 192<\/span>..=<\/span>223<\/span>,<\/span> a2<\/span>,<\/span> a3<\/span>,<\/span> a4<\/span> }<\/span> =><\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"{}.{}.{}.{}\u306f\u30af\u30e9\u30b9C\u306eV4\u30a2\u30c9\u30ec\u30b9\u3067\u3059\"<\/span>,<\/span> n<\/span>,<\/span> a2<\/span>,<\/span> a3<\/span>,<\/span> a4<\/span>)<\/span>\r\n},<\/span>\r\n<\/code><\/pre>\n
\u3068\u66f8\u304f\u3088\u3046\u3067\u3059\u3002
\n\u3061\u306a\u307f\u306b\u308f\u304b\u308a\u3084\u3059\u3044\u3088\u3046\u306ba1\u306e\u5024\u3092n\u306b\u4ee3\u5165\u3057\u307e\u3057\u305f\u304c\u3001a1: a1 @ 192..=223\u3068\u66f8\u3044\u3066\u3082\u5927\u4e08\u592b\u306e\u3088\u3046\u3067\u3059\u3002<\/p>\n
|<\/h2>\n
C\u3067\u306f\u8ad6\u7406OR \u30d3\u30c3\u30c8OR\u7b49\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
\/\/ \u8ad6\u7406OR<\/span>\r\nif<\/span> (<\/span> a<\/span> ||<\/span> b<\/span> )<\/span> {<\/span> ...<\/span> }<\/span>\r\n\r\n\/\/ \u30d3\u30c3\u30c8OR<\/span>\r\na<\/span> =<\/span> b<\/span> |<\/span> c<\/span>;<\/span>\r\n<\/code><\/pre>\n
Rust\u3067\u306f\u8ad6\u7406OR \u30d3\u30c3\u30c8OR\u306e\u4ed6\u3001\u30d1\u30bf\u30fc\u30f3OR \u30af\u30ed\u30fc\u30b8\u30e3\u7b49\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
\u30d1\u30bf\u30fc\u30f3OR<\/h3>\n
match\u5f0f\u306e\u30d1\u30bf\u30fc\u30f3\u3067<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span> =<\/span> 0<\/span>;<\/span>\r\n\r\n    match<\/span> x<\/span> {<\/span>\r\n        0<\/span> |<\/span> 1<\/span> =><\/span> println!<\/span>(<\/span>\"x is 0 or 1.\"<\/span>),<\/span>\r\n        _<\/span>     =><\/span> println!<\/span>(<\/span>\"x is other.\"<\/span>)<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u306e\u3088\u3046\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
\u30af\u30ed\u30fc\u30b8\u30e3<\/h3>\n
\u30e2\u30c0\u30f3\u306a\u8a00\u8a9e\u306e\u4f3c\u305f\u3088\u3046\u306a\u4ed5\u69d8\u306b\u7121\u540d\u95a2\u6570\u3084\u30e9\u30e0\u30c0\u5f0f\u3068\u3044\u3063\u305f\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u304cC\u306b\u306f\u306a\u3044\u4ed5\u69d8\u3067\u3059\u3002
\nThe Rust Programming Language\u306b\u3088\u308b\u3068<\/p>\n
Rust\u306e\u30af\u30ed\u30fc\u30b8\u30e3\u306f\u3001\u5909\u6570\u306b\u4fdd\u5b58\u3057\u305f\u308a\u3001\u5f15\u6570\u3068\u3057\u3066\u4ed6\u306e\u95a2\u6570\u306b\u6e21\u3059\u3053\u3068\u306e\u3067\u304d\u308b\u533f\u540d\u95a2\u6570<\/p><\/blockquote>\n
\u3060\u305d\u3046\u3067\u3059\u3002<\/p>\n
\u4f8b\u3048\u3070\u30d9\u30af\u30bf\u3092\u30af\u30ed\u30fc\u30b8\u30e3\u3067\u6307\u5b9a\u3057\u305f\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3067\u30bd\u30fc\u30c8\u3059\u308bsort_by\u3068\u3044\u3046\u95a2\u6570\u304c\u3042\u308a<\/p>\n
use<\/span> std<\/span>::<\/span>cmp<\/span>::<\/span>Ordering<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> mut<\/span> v<\/span> =<\/span> vec!<\/span>[<\/span>9<\/span>,<\/span> 5<\/span>,<\/span> 0<\/span>,<\/span> 7<\/span>,<\/span> 2<\/span>,<\/span> 1<\/span>,<\/span> 6<\/span>,<\/span> 4<\/span>,<\/span> 3<\/span>,<\/span> 8<\/span>];<\/span>\r\n\r\n    \/\/ \u6607\u9806<\/span>\r\n    v<\/span>.sort_by<\/span>(|<\/span>a<\/span>,<\/span> b<\/span>|<\/span> a<\/span>.cmp<\/span>(<\/span>b<\/span>));<\/span>\r\n    println!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> v<\/span>);<\/span>\r\n\r\n    \/\/ \u964d\u9806<\/span>\r\n    v<\/span>.sort_by<\/span>(|<\/span>a<\/span>,<\/span> b<\/span>|<\/span> b<\/span>.cmp<\/span>(<\/span>a<\/span>));<\/span>\r\n    println!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> v<\/span>);<\/span>\r\n\r\n    \/\/ \u5076\u6570\u306e\u307b\u3046\u304c\u5c0f\u3055\u3044\u3002\u5076\u5947\u304c\u540c\u3058\u5834\u5408\u306f\u6607\u9806<\/span>\r\n    v<\/span>.sort_by<\/span>(|<\/span>a<\/span>,<\/span> b<\/span>|<\/span> match<\/span> (<\/span>a<\/span> %<\/span> 2<\/span>)<\/span>.cmp<\/span>(<\/span>&<\/span>(<\/span>b<\/span> %<\/span> 2<\/span>))<\/span> {<\/span>\r\n        Ordering<\/span>::<\/span>Less<\/span>    =><\/span> Ordering<\/span>::<\/span>Less<\/span>,<\/span>\r\n        Ordering<\/span>::<\/span>Greater<\/span> =><\/span> Ordering<\/span>::<\/span>Greater<\/span>,<\/span>\r\n        Ordering<\/span>::<\/span>Equal<\/span>   =><\/span> a<\/span>.cmp<\/span>(<\/span>b<\/span>)<\/span>\r\n    });<\/span>\r\n    println!<\/span>(<\/span>\"{:?}\"<\/span>,<\/span> v<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u3093\u306a\u611f\u3058\u3067\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
\u7121\u7406\u3084\u308a\u7d44\u8fbc\u307f\u3063\u307d\u3044\u4f8b\u3092\u51fa\u3057\u3066\u307f\u308b\u3068\u3001\u3088\u304f\u30bf\u30a4\u30de\u30fc\u306e\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3068\u304b\u3067<\/p>\n
void<\/span> foo<\/span>(<\/span> void<\/span> )<\/span>\r\n{<\/span>\r\n    timer_start<\/span>(<\/span>500<\/span>,<\/span> cb_tmout<\/span>);<\/span>\r\n\r\n    \/\/ \u306a\u3093\u304b\u8272\u3005\u306a\u51e6\u7406<\/span>\r\n}<\/span>\r\n\r\n\/\/ \u8272\u3005\u306a\u95a2\u6570\u304c\u3042\u3063\u3066<\/span>\r\n\/\/ \u5fc5\u305a\u3057\u3082\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092<\/span>\r\n\/\/ \u8fd1\u304f\u306b\u7f6e\u3051\u308b\u8a33\u3067\u306f\u7121\u3044<\/span>\r\n\r\nvoid<\/span> cb_tmout<\/span>(<\/span> void<\/span> )<\/span>\r\n{<\/span>\r\n    led_blink<\/span>();<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u3093\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u3001\u300c\u3042\u308c\u3001\u3053\u306e\u30bf\u30a4\u30de\u30fc\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3057\u305f\u3068\u304d\u4f55\u3059\u308b\u3093\u3060\u3063\u3051\uff1f\u300d\u307f\u305f\u3044\u306a\u3053\u3068\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308b\u2026\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u30af\u30ed\u30fc\u30b8\u30e3\u3092\u4f7f\u3046\u3053\u3068\u3067<\/p>\n
fn<\/span> foo<\/span>()<\/span> {<\/span>\r\n    blink_timer<\/span>.start<\/span>(<\/span>500<\/span>,<\/span> ||<\/span> led<\/span>.blink<\/span>());<\/span>\r\n\r\n    \/\/ \u306a\u3093\u304b\u8272\u3005\u306a\u51e6\u7406<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3068\u66f8\u3051\u308b\u306e\u3067\u3001\u300c\u3042\u30fc\u3001\u3053\u3044\u3064\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3057\u305f\u3089LED\u30d6\u30ea\u30f3\u30af\u3059\u308b\u306e\u306d\u300d\u3068\u3059\u3050\u306b\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n
?<\/h2>\n
TBD<\/p>\n
#<\/h2>\n
TBD<\/p>\n
$<\/h2>\n
TBD<\/p>\n
()<\/h2>\n
TBD<\/p>\n
<><\/h2>\n
TBD<\/p>\n
..<\/h2>\n
TBD<\/p>\n
-><\/h2>\n
TBD<\/p>\n
=><\/h2>\n
TBD<\/p>\n
…<\/h2>\n
TBD<\/p>\n
\u304a\u308f\u308a\u306b<\/h1>\n
\u4f55\u304b\u65b0\u3057\u3044\u8a00\u8a9e\u3092\u5b66\u3076\u3068\u304d\u306b\u672a\u77e5\u306e\u8a18\u53f7\u306b\u6238\u60d1\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u8a18\u53f7\u3063\u3066\u306a\u304b\u306a\u304b\u691c\u7d22\u3067\u30d2\u30c3\u30c8\u3055\u305b\u308b\u306e\u304c\u96e3\u3057\u3044\u3067\u3059\u3088\u306d\u3001\u540d\u524d\u3082\u308f\u304b\u3089\u306a\u3044\u3067\u3059\u3057\u3002
\n\u3053\u306e\u8a18\u4e8b\u304c\u305d\u3093\u306aRust\u521d\u5b66\u8005\u306e\u9053\u6a19\u2026\u306f\u8a00\u3044\u904e\u304e\u304b\u3001\u691c\u7d22\u306e\u304d\u3063\u304b\u3051\u3050\u3089\u3044\u306b\u306f\u306a\u308b\u3053\u3068\u3092\u9858\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u306f\u3058\u3081\u306b \u3069\u3046\u3082\u3001\u30ec\u30ac\u30b7\u30fc\u7d44\u8fbc\u307f\u30a8\u30f3\u30b8\u30cb\u30a2\u306e@yagisawa\u3067\u3059\u3002 Rust\u3092\u52c9\u5f37\u3057\u3066\u3044\u308b\u3068C\u3067\u306f\u898b\u304b\u3051\u306a\u3044 […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45039","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\/45039-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"\u306f\u3058\u3081\u306b \u3069\u3046\u3082\u3001\u30ec\u30ac\u30b7\u30fc\u7d44\u8fbc\u307f\u30a8\u30f3\u30b8\u30cb\u30a2\u306e@yagisawa\u3067\u3059\u3002 Rust\u3092\u52c9\u5f37\u3057\u3066\u3044\u308b\u3068C\u3067\u306f\u898b\u304b\u3051\u306a\u3044 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45039-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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