{"id":45647,"date":"2023-03-30T20:21:14","date_gmt":"2023-01-08T22:33:25","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45647-2\/"},"modified":"2024-04-29T21:12:19","modified_gmt":"2024-04-29T13:12:19","slug":"45647-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45647-2\/","title":{"rendered":""},"content":{"rendered":"

\u3053\u306e\u8a18\u4e8b\u306b\u3064\u3044\u3066<\/h1>\n

Rust Design Patterns\u3067\u7d39\u4ecb\u3055\u308c\u3066\u3044\u308bRust\u3067\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3051\u308b\u30a4\u30c7\u30a3\u30aa\u30e0\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n

format!\u30de\u30af\u30ed\u3092\u4f7f\u7528\u3057\u305fstring\u306e\u7d50\u5408<\/h1>\n

\u6240\u6709\u6a29\u306e\u5236\u7d04\u306b\u3088\u308aRust\u3067\u306estring\u306e\u7d50\u5408\u306f\u3068\u3066\u3082\u3081\u3093\u3069\u304f\u3055\u3044\u3067\u3059\u3002<\/p>\n

let<\/span> mut<\/span> result<\/span> =<\/span> \"Hello\"<\/span>.to_owned<\/span>();<\/span>\r\nlet<\/span> mut<\/span> name<\/span> =<\/span> \"World\"<\/span>.to_owned<\/span>();<\/span>\r\nresult<\/span>.push_str<\/span>(<\/span>name<\/span>);<\/span>\r\nresult<\/span>.push<\/span>(<\/span>'!'<\/span>);<\/span>\r\n<\/code><\/pre>\n
format!\u30de\u30af\u30ed\u3092\u4f7f\u3048\u3070\u304b\u3093\u305f\u3093\u306b\u7d50\u5408\u3067\u304d\u307e\u3059\u3002<\/p>\n
let<\/span> mut<\/span> name<\/span> =<\/span> \"World\"<\/span>.to_owned<\/span>();<\/span>\r\nlet<\/span> mut<\/span> result<\/span> =<\/span> format!<\/span>(<\/span>\"Hello {}!\"<\/span>,<\/span> name<\/span>);<\/span>\r\n<\/code><\/pre>\n
Default\u30c8\u30ec\u30a4\u30c8<\/h1>\n
Rust\u306e\u591a\u304f\u306e\u578b\u304c\u305d\u306e\u578b\u72ec\u81ea\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\uff08new()\u30e1\u30bd\u30c3\u30c9\uff09\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001Rust\u306f\u300cnew()\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u578b\u5168\u3066\u306b\u6e21\u3063\u3066\u518d\u5e30\u7684\u306b\u9069\u7528\u53ef\u80fd\u300d\u3068\u3044\u3046\u62bd\u8c61\u5316\u3092\u884c\u3063\u3066\u3044\u307e\u305b\u3093\u3002
\n\u306a\u306e\u3067\u3001new()\u3092\u5b9a\u7fa9\u3059\u308b\u3068\u304d\u306b\u5168\u3066\u306e\u30e1\u30f3\u30d0\u306e\u5024\u3092\u66f8\u3044\u3066\u3084\u3089\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\u3002<\/p>\n
struct<\/span> Hako<\/span>\r\n{<\/span>\r\n    one<\/span> :<\/span> i32<\/span>,<\/span>\r\n    two<\/span> :<\/span> i64<\/span>,<\/span>\r\n    fone<\/span> :<\/span> f32<\/span>,<\/span>\r\n    ftwo<\/span> :<\/span> f64<\/span>,<\/span>\r\n}<\/span>\r\n\r\nimpl<\/span> Hako<\/span> {<\/span>\r\n    fn<\/span> new<\/span>()<\/span> -><\/span> Self<\/span>\r\n    {<\/span>\r\n         Hako<\/span> {<\/span>one<\/span> :<\/span> 0<\/span>,<\/span> two<\/span> :<\/span> 0<\/span>,<\/span> fone<\/span> :<\/span> 0.0<\/span>,<\/span> ftwo<\/span> :<\/span> 0.0<\/span>}<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u898b\u3066\u306e\u901a\u308anew\u5185\u3067\u4e00\u3064\u4e00\u3064\u8981\u7d20\u306e\u521d\u671f\u5024\u3092\u6307\u5b9a\u3059\u308b\u306e\u306f\u3081\u3093\u3069\u304f\u3055\u3044\u3067\u3059\u3002
\n\u305d\u3053\u3067\u3001Default\u30c8\u30ec\u30a4\u30c8\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
#[derive(Default)]<\/span>\r\nstruct<\/span> Hako<\/span>\r\n{<\/span>\r\n    one<\/span> :<\/span> i32<\/span>,<\/span>\r\n    two<\/span> :<\/span> i64<\/span>,<\/span>\r\n    fone<\/span> :<\/span> f32<\/span>,<\/span>\r\n    ftwo<\/span> :<\/span> f64<\/span>,<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> -><\/span> ()<\/span>\r\n{<\/span>\r\n    let<\/span> a<\/span> :<\/span> Hako<\/span> =<\/span> Default<\/span>::<\/span>default<\/span>();<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
#[derive(Default)]\u3092\u7d99\u627f\u3059\u308b\u3060\u3051\u3067\u5b9f\u88c5\u53ef\u80fd\u3002rust\u306e\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306a\u3089\u3059\u3067\u306bDefault\u30c8\u30ec\u30a4\u30c8\u304c\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001new()\u306e\u3088\u3046\u306b\u8981\u7d20\u306e\u521d\u671f\u5024\u3092\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002
\n\u3055\u3089\u306b\u3001Default\u30c8\u30ec\u30a4\u30c8\u306f\u518d\u5e30\u7684\u306b\u9069\u7528\u3055\u308c\u308b\u306e\u3067\u81ea\u5206\u3067\u5b9a\u7fa9\u3057\u305f\u69cb\u9020\u4f53\u3092\u30e1\u30f3\u30d0\u3068\u3057\u3066\u6301\u3064\u69cb\u9020\u4f53\u3067\u3082Default\u30c8\u30ec\u30a4\u30c8\u304c\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308c\u3070#[derive(Default)]\u3092\u7d99\u627f\u3059\u308b\u3060\u3051\u3067\u5b9f\u88c5\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
#[derive(Default)]<\/span>\r\nstruct<\/span> Hako<\/span>\r\n{<\/span>\r\n    one<\/span> :<\/span> i32<\/span>,<\/span>\r\n    two<\/span> :<\/span> i64<\/span>,<\/span>\r\n    fone<\/span> :<\/span> f32<\/span>,<\/span>\r\n    ftwo<\/span> :<\/span> f64<\/span>,<\/span>\r\n}<\/span>\r\n\r\n#[derive(Default)]<\/span>\r\nstruct<\/span> LHako<\/span>\r\n{<\/span>\r\n    one<\/span> :<\/span> Hako<\/span>,<\/span>\r\n    two<\/span> :<\/span> Hako<\/span>,<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> -><\/span> ()<\/span>\r\n{<\/span>\r\n    let<\/span> a<\/span> :<\/span> LHako<\/span> =<\/span> Default<\/span>::<\/span>default<\/span>();<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u500b\u4eba\u7684\u306b\u306fnew()\u3063\u3066\u3044\u3089\u306a\u304f\u306d\uff1f\u3068\u611f\u3058\u307e\u3057\u305f\u3002<\/p>\n
\u30c7\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u5f8c\u59cb\u672b<\/h1>\n
\u95a2\u6570\u5185\u3067\u8907\u6570\u306e\u8fd4\u3059\u3068\u3053\u308d\u304c\u3042\u308b\u3068\u3001\u51e6\u7406\u306e\u6d41\u308c\u304c\u308f\u304b\u308a\u306b\u304f\u3044\u4e0a\u306b\u3001\u540c\u3058\u3088\u3046\u306a\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3059\u53ef\u80fd\u6027\u304c\u9ad8\u3044\u3067\u3059\u3002Java\u306a\u3069\u3067\u306ffinalize\u30d6\u30ed\u30c3\u30af\u3001\u30e1\u30bd\u30c3\u30c9\u3053\u3046\u3044\u3063\u305f\u4e8b\u3092\u884c\u3046\u306e\u3067\u3059\u304c\u3001\u3053\u306e\u3088\u3046\u306a\u6a5f\u80fd\u306fRust\u306b\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u306e\u304b\u308f\u308a\u3001\u95a2\u6570\u5185\u3067\u30ed\u30fc\u30ab\u30eb\u306e\u69cb\u9020\u4f53\u3068\u305d\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u6a5f\u80fd\u3092\u5229\u7528\u3057\u3066\u3001\u95a2\u6570\u304c\u629c\u3051\u305f\u3068\u304d\u306b\u5b9f\u884c\u3055\u308c\u308b\u5f8c\u59cb\u672b\u51e6\u7406\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n
fn<\/span> hoge<\/span>()<\/span> -><\/span> i32<\/span>\r\n{<\/span>\r\n    struct<\/span> Final<\/span>;<\/span>\r\n    impl<\/span> Drop<\/span> for<\/span> Final<\/span>\r\n    {<\/span>\r\n         fn<\/span> drop<\/span>(<\/span>&<\/span>mut<\/span> self<\/span>)<\/span>\r\n         {<\/span>\r\n              println!<\/span>(<\/span>\"Bye Bye\"<\/span>);<\/span>\r\n         }<\/span>\r\n    }<\/span>\r\n    let<\/span> finalizer<\/span> =<\/span> Final<\/span>;<\/span>\r\n    \/*\u3053\u3053\u3067\u51e6\u7406\u3092\u5b9f\u884c*\/<\/span>\r\n    \/*\u95a2\u6570\u304b\u3089\u629c\u3051\u308b\u3068\u304b\u306a\u3089\u305a\"Bye Bye\"\u3057\u3066\u304f\u308c\u308b*\/<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Option\u578b\u3067\u30a4\u30c6\u30ec\u30fc\u30c8<\/h1>\n
Option\u578b\u306f\u5b9f\u306fIntoIterator\u30c8\u30ec\u30a4\u30c8\u3092\u5b9f\u88c5\u3057\u3066\u3044\u307e\u3059\u3002
\n\u3053\u306e\u305f\u3081Some\u3067\u30e9\u30c3\u30d7\u3059\u308b\u3068\u30a4\u30c6\u30ec\u30fc\u30bf\u306b\u5bfe\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u305f\u95a2\u6570\u304c\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
let<\/span> hoge<\/span> =<\/span> Some<\/span>(<\/span>\"hoge\"<\/span>);<\/span>\r\nlet<\/span> mut<\/span> mojo<\/span> =<\/span> vec!<\/span>[<\/span>\"buzz\"<\/span>,<\/span> \"fizz\"<\/span>];<\/span>\r\nmojo<\/span>.extend<\/span>(<\/span>hoge<\/span>);<\/span>\r\nfor<\/span> elem<\/span> in<\/span> mojo<\/span>.iter<\/span>()<\/span>.charin<\/span>(<\/span>hoge<\/span>.iter<\/span>())<\/span>\r\n{<\/span>\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> elem<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u62e1\u5f35\u6027\u306e\u305f\u3081\u306e\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8<\/h1>\n
pub\u3067\u4fee\u98fe\u3057\u306a\u3044\u30d5\u30a7\u30fc\u30eb\u30c9\u3092\u7528\u3044\u3066\u69cb\u9020\u4f53\u3092\u62e1\u5f35\u3057\u3066\u3082\u3001\u52d5\u4f5c\u306e\u5b89\u5b9a\u6027\u304c\u5931\u308f\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n
mod<\/span> a<\/span> {<\/span>\r\n    \/\/ \u30d1\u30d6\u30ea\u30c3\u30af\u306a\u69cb\u9020\u4f53<\/span>\r\n    pub<\/span> struct<\/span> S<\/span> {<\/span>\r\n        pub<\/span> foo<\/span>:<\/span> i32<\/span>,<\/span>\r\n        \/\/ \u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306a\u30e1\u30f3\u30d0\u5909\u6570<\/span>\r\n        bar<\/span>:<\/span> i32<\/span>,<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>(<\/span>s<\/span>:<\/span> a<\/span>::<\/span>S<\/span>)<\/span> {<\/span>\r\n    \/\/ \u516c\u958b\u3055\u308c\u3066\u3044\u306a\u3044\u90e8\u5206\u306b\u95a2\u3057\u3066\u306f\"..\"\u3067\u521d\u671f\u5316\u3059\u308b<\/span>\r\n    let<\/span> hoge<\/span> =<\/span> a<\/span>::<\/span>S<\/span> {<\/span> foo<\/span>:<\/span> _<\/span>,<\/span> ..<\/span>};<\/span>\r\n\r\n    \/\/ \u69cb\u9020\u4f53S\u306b\u30e1\u30f3\u30d0\u304c\u65b0\u3057\u304f\u8ffd\u52a0\u3055\u308c\u3066\u3082\u3053\u306e\u90e8\u5206\u306f\u4fee\u6b63\u3057\u306a\u304f\u3066\u3082\u3088\u3044\u3002<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf<\/h1>\n
Rust\u306b\u306f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u4ee3\u308f\u308a\u306bnew\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3059\u308b\u3053\u3068\u304c\u6163\u4f8b\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n
pub<\/span> struct<\/span> Hoge<\/span> {<\/span>\r\n    fuga<\/span> :<\/span> i32<\/span>,<\/span>\r\n}<\/span>\r\n\r\nimpl<\/span> Hoge<\/span> {<\/span>\r\n    pub<\/span> fn<\/span> new<\/span>()<\/span> -><\/span> Self<\/span>\r\n    {<\/span>\r\n       Hoge<\/span> {<\/span>fuga<\/span> :<\/span> 42<\/span>,}<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
mem::replace\u306b\u3088\u308benum\u306e\u66f8\u304d\u63db\u3048<\/h1>\n
Rust\u306eenum\u3092\u4f7f\u3063\u3066\u3044\u308b\u3068\u304d\u306benum\u306e\u30c7\u30fc\u30bf\u3092\u66f8\u304d\u63db\u3048\u305f\u304f\u306a\u308b\u3068\u304d\u304c\u3042\u308a\u307e\u3059\u3002
\n\u3061\u3087\u3046\u3069\u4e0b\u306e\u3088\u3046\u306a\u611f\u3058\u3067\u3059\u3002<\/p>\n
enum<\/span> MyEnum<\/span>\r\n{<\/span>\r\n    A<\/span>{<\/span> name<\/span> :<\/span> String<\/span>},<\/span>\r\n    B<\/span>{<\/span> name<\/span> :<\/span> String<\/span>},<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> overwrite<\/span>(<\/span>e<\/span> :<\/span> &<\/span>mut<\/span> MyEnum<\/span>)<\/span> -><\/span> ()<\/span>\r\n{<\/span>\r\n    *<\/span>e<\/span> =<\/span> match<\/span> *<\/span>e<\/span> {<\/span>\r\n        A<\/span>(<\/span>ref<\/span> mut<\/span> name<\/span>)<\/span> =><\/span> B<\/span> {<\/span>name<\/span> :<\/span> String<\/span>::<\/span>new<\/span>(<\/span>\"B\u3060\u305c\"<\/span>)},<\/span>\r\n        B<\/span>(<\/span>ref<\/span> mut<\/span> name<\/span>)<\/span> =><\/span> A<\/span> {<\/span>name<\/span> :<\/span> String<\/span>::<\/span>new<\/span>(<\/span>\"A\u3060\u305c\"<\/span>)},<\/span>\r\n     }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3057\u304b\u3057\u3001\u3053\u308c\u306f\u4ee5\u4e0b\u306e\u30a8\u30e9\u30fc\u306b\u3088\u308a\u30b3\u30f3\u30d1\u30a4\u30eb\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n
cannot move out of borrowed content\r\n<\/code><\/pre>\n
e\u306fname\u3092\u53c2\u7167\u3057\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002name\u3092\u5909\u66f4\u3059\u308b\u3068e\u306e\u53c2\u7167\u5148\u304c\u6d88\u3048\u308b\u306e\u3067\u30dc\u30ed\u30fc\u30c1\u30a7\u30c3\u30ab\u304c\u30ad\u30ec\u307e\u3059\u3002
\n\u305d\u3053\u3067\u3001mem::replace\u3092\u4f7f\u3044\u307e\u3059\u3002mem::replace\u3092\u4f7f\u3046\u3068\u30dc\u30ed\u30fc\u30c1\u30a7\u30c3\u30ab\u3092\u6012\u3089\u305b\u308b\u3053\u3068\u306a\u304f\u53c2\u7167\u5148\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\uff08\u3053\u308c\u3063\u3066\u5b89\u5168\u306a\u64cd\u4f5c\u306a\u306e\u304b\uff1f\uff09<\/p>\n
enum<\/span> MyEnum<\/span>\r\n{<\/span>\r\n    A<\/span>{<\/span> name<\/span> :<\/span> String<\/span>},<\/span>\r\n    B<\/span>{<\/span> name<\/span> :<\/span> String<\/span>},<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> overwrite<\/span>(<\/span>e<\/span> :<\/span> &<\/span>mut<\/span> MyEnum<\/span>)<\/span> -><\/span> ()<\/span>\r\n{<\/span>\r\n    *<\/span>e<\/span> =<\/span> match<\/span> *<\/span>e<\/span> {<\/span>\r\n        A<\/span>(<\/span>ref<\/span> mut<\/span> name<\/span>)<\/span> =><\/span> B<\/span> {<\/span>name<\/span> :<\/span> mem<\/span>::<\/span>replace<\/span>(<\/span>name<\/span>,<\/span> String<\/span>::<\/span>new<\/span>(<\/span>\"B\u3060\u305c\"<\/span>))},<\/span>\r\n        B<\/span>(<\/span>ref<\/span> mut<\/span> name<\/span>)<\/span> =><\/span> A<\/span> {<\/span>name<\/span> :<\/span> mem<\/span>::<\/span>replace<\/span>(<\/span>name<\/span>,<\/span> String<\/span>::<\/span>new<\/span>(<\/span>\"A\u3060\u305c\"<\/span>))},<\/span>\r\n     }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30af\u30ed\u30fc\u30b8\u30e3\u306b\u5909\u6570\u6e21\u3057<\/h1>\n
\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u30af\u30ed\u30fc\u30b8\u30e3\u306b\u306f\u501f\u7528\u304b\u3001\u30e0\u30fc\u30d6\u3067\u74b0\u5883\u306e\u5909\u6570\u3092\u6e21\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u53c2\u7167\u3084\u30b3\u30d4\u30fc\u3067\u6e21\u3057\u305f\u3044\u3068\u304d\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u3088\u3046\u306a\u5834\u5408\u306f\u3001\u307e\u305a\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5909\u6570\u3092Rc\u3067\u30e9\u30c3\u30d7\u3057\u3001\u30af\u30ed\u30fc\u30b8\u30e3\u3092\u30d6\u30ed\u30c3\u30af\u306e\u4e2d\u306b\u5165\u308c\u305f\u4e0a\u3067\u3001\u30d6\u30ed\u30c3\u30af\u5185\u90e8\u3067\u5404\u5909\u6570\u3092\u518d\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u3057\u307e\u3059\u3002<\/p>\n
let<\/span> num1<\/span> =<\/span> Rc<\/span>::<\/span>new<\/span>(<\/span>1<\/span>);<\/span>\r\nlet<\/span> num2<\/span> =<\/span> Rc<\/span>::<\/span>new<\/span>(<\/span>2<\/span>);<\/span>\r\nlet<\/span> num3<\/span> =<\/span> Rc<\/span>::<\/span>new<\/span>(<\/span>3<\/span>);<\/span>\r\nlet<\/span> closure<\/span> =<\/span> {<\/span>\r\n    \/\/ num1\u306f\u30e0\u30fc\u30d6<\/span>\r\n    let<\/span> num2<\/span> =<\/span> num2<\/span>.clone<\/span>();<\/span>  \/\/ num2\u306f\u30b3\u30d4\u30fc<\/span>\r\n    let<\/span> num3<\/span> =<\/span> num3<\/span>.as_ref<\/span>();<\/span>  \/\/ num3\u306f\u501f\u7528<\/span>\r\n    move<\/span> ||<\/span> {<\/span>\r\n        *<\/span>num1<\/span> +<\/span> *<\/span>num2<\/span> +<\/span> *<\/span>num3<\/span>;<\/span>\r\n    }<\/span>\r\n};<\/span>\r\n\r\n<\/code><\/pre>\n
\u53c2\u8003\u6587\u732e<\/h1>\n
Rust Design Patterns
\n\u30e9\u30b9\u30c8\u306e\u975e\u516c\u5f0f\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u96c6<\/p>\n
Default\u30c8\u30ec\u30a4\u30c8
\nDefault\u30c8\u30ec\u30a4\u30c8\u306e\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/p>\n
mem::replace\u95a2\u6570
\nmem::replace\u95a2\u6570\u306e\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/p>\n
\u6551\u63f4\u8981\u8acb<\/h1>\n
\u300cCollections are smart pointers\u300d\u30a4\u30c7\u30a3\u30aa\u30e0\u304c\u3061\u3087\u3063\u3068\u610f\u5473\u304c\u308f\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002
\n\u308f\u304b\u3063\u305f\u4eba\u304c\u3044\u305f\u3089\u30b3\u30e1\u30f3\u30c8\u3067\u8aac\u660e\u3057\u3066\u3044\u305f\u3060\u3051\u308c\u3070\u5e78\u3044\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u3053\u306e\u8a18\u4e8b\u306b\u3064\u3044\u3066 Rust Design Patterns\u3067\u7d39\u4ecb\u3055\u308c\u3066\u3044\u308bRust\u3067\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3051\u308b\u30a4 […]<\/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-45647","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\/45647-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"\u3053\u306e\u8a18\u4e8b\u306b\u3064\u3044\u3066 Rust Design Patterns\u3067\u7d39\u4ecb\u3055\u308c\u3066\u3044\u308bRust\u3067\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3051\u308b\u30a4 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45647-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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