{"id":45650,"date":"2023-06-27T15:52:28","date_gmt":"2023-03-18T09:00:39","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45650-2\/"},"modified":"2024-04-30T10:56:40","modified_gmt":"2024-04-30T02:56:40","slug":"45650-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45650-2\/","title":{"rendered":""},"content":{"rendered":"

\u5f8c\u5b66\u306e\u305f\u3081\u306bRust\u3067Singleton\u3092\u5b9f\u73fe\u3059\u308b\u65b9\u6cd5\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002\u6539\u3081\u3066\u8abf\u3079\u76f4\u3059\u3068\u3001\u3044\u308d\u3044\u308d\u306a\u65b9\u6cd5\u304c\u3042\u3063\u3066\u8ff7\u3063\u3066\u3057\u307e\u3046\u306e\u3067\u6bd4\u8f03\u3057\u3066\u307f\u307e\u3057\u305f\u3002Rust\u3067\u30a2\u30d7\u30ea\u5185\u3067\u5171\u901a\u306e\u8a2d\u5b9a\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u7528\u610f\u3057\u305f\u308a\u3001\u30ed\u30ac\u30fc\u306a\u3069\u3092\u5b9f\u88c5\u3059\u308b\u306e\u306b\u5f79\u7acb\u3064\u3067\u3057\u3087\u3046\u3002<\/p>\n

\u7d50\u8ad6 – once_cell\u30af\u30ec\u30fc\u30c8\u3092\u4f7f\u3046\u306e\u304c\u7c21\u5358<\/h1>\n

\u3053\u306e\u6295\u7a3f\u3092\u66f8\u3044\u3066\u3044\u308b\u6642\u70b9\u3067\u3001once_cell\u30af\u30ec\u30fc\u30c8\u306fRust\u6a19\u6e96\u306b\u53d6\u308a\u8fbc\u307e\u308c\u308b\u3053\u3068\u304c\u691c\u8a0e\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u3067\u3044\u308d\u3044\u308d\u306a\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u304c\u3001once_cell\u30af\u30ec\u30fc\u30c8\u3092\u4f7f\u3046\u65b9\u6cd5\u304c\u3001\u7c21\u6f54\u3067\u898b\u901a\u3057\u304c\u3088\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n

use<\/span> once_cell<\/span>::<\/span>sync<\/span>::<\/span>Lazy<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>sync<\/span>::<\/span>Mutex<\/span>;<\/span>\r\n\r\n\/\/ \u8a2d\u5b9a<\/span>\r\n#[derive(Debug)]<\/span>\r\npub<\/span> struct<\/span> Config<\/span> {<\/span>\r\n    debug_level<\/span>:<\/span> usize<\/span>,<\/span>\r\n    data<\/span>:<\/span> Vec<\/span><<\/span>usize<\/span>><\/span>,<\/span>\r\n}<\/span>\r\n\r\n\/\/ \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u521d\u671f\u5316<\/span>\r\npub<\/span> static<\/span> INSTANCE<\/span>:<\/span> Lazy<\/span><<\/span>Mutex<\/span><<\/span>Config<\/span>>><\/span> =<\/span> Lazy<\/span>::<\/span>new<\/span>(||<\/span> {<\/span>\r\n    Mutex<\/span>::<\/span>new<\/span>(<\/span>Config<\/span> {<\/span>\r\n        data<\/span>:<\/span> vec!<\/span>[<\/span>1<\/span>],<\/span>\r\n        debug_level<\/span>:<\/span> 0<\/span>,<\/span>\r\n    })<\/span>\r\n});<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    \/\/ \u8a2d\u5b9a\u306e\u5909\u66f4<\/span>\r\n    INSTANCE<\/span>.lock<\/span>()<\/span>.unwrap<\/span>()<\/span>.data<\/span>.push<\/span>(<\/span>2<\/span>);<\/span>\r\n    INSTANCE<\/span>.lock<\/span>()<\/span>.unwrap<\/span>()<\/span>.debug_level<\/span> =<\/span> 1<\/span>;<\/span>\r\n    \/\/ \u8a2d\u5b9a\u306e\u53c2\u7167<\/span>\r\n    println!<\/span>(<\/span>\"config={:?}\"<\/span>,<\/span> INSTANCE<\/span>.lock<\/span>()<\/span>.unwrap<\/span>());<\/span>\r\n    \/\/ \u518d\u3073\u3001\u5909\u66f4\u3068\u53c2\u7167<\/span>\r\n    INSTANCE<\/span>.lock<\/span>()<\/span>.unwrap<\/span>()<\/span>.data<\/span>.push<\/span>(<\/span>3<\/span>);<\/span>\r\n    println!<\/span>(<\/span>\"config={:?}\"<\/span>,<\/span> INSTANCE<\/span>.lock<\/span>()<\/span>.unwrap<\/span>());<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
(\u53c2\u8003)\u4ee5\u4e0b\u304conce_cell\u306e\u30ea\u30dd\u30b8\u30c8\u30ea\u3067\u3059\u3002<\/p>\n
 <\/p>\n
\u3061\u306a\u307f\u306b\u306a\u305c\u3001Singoleton\u3092\u8abf\u3079\u305f\u306e\u304b\u3068\u8a00\u3048\u3070\u3001\u3082\u3063\u3068\u624b\u8efd\u306b\u4e71\u6570\u3092\u4f7f\u3048\u308b\u30b3\u30f3\u30d1\u30af\u30c8\u306a\u30af\u30ec\u30fc\u30c8\u304c\u6b32\u3057\u304b\u3063\u305f\u306e\u3067\u3001\u81ea\u5206\u3067\u30af\u30ec\u30fc\u30c8\u4f5c\u3063\u305f\u304b\u3089\u3067\u3059\u3002\u826f\u304b\u3063\u305f\u3089\u4f7f\u3063\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n
 <\/p>\n
\u306a\u305cRust\u3067Singleton\u3092\u4f7f\u3046\u306e\u304c\u96e3\u3057\u3044\u306e\u304b<\/h1>\n
\u3068\u306f\u8a00\u3048\u3001\u521d\u898b\u3067\u306f\u4e0a\u8a18\u306e\u65b9\u6cd5\u3067\u3082\u5341\u5206\u8907\u96d1\u3067\u3059\u3002\u306a\u305c\u3001Rust\u3067\u306f\u7c21\u5358\u306bSingleton\u304c\u4f7f\u3048\u306a\u3044\u306e\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n
Rust\u3067\u53ef\u5909\u306e\u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\u306f\u975e\u63a8\u5968\u3067\u3042\u308b<\/h2>\n
\u307e\u305a\u3001Rust\u3067\u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\u3092\u4f7f\u3046\u306b\u306f\u3001static\u3092\u4f7f\u3044\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u53ef\u5909\u306a\u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\u3092\u4f7f\u3046\u305f\u3081\u306b\u306f\u3001unsafe { … } \u3067\u62ec\u308b\u5fc5\u8981\u304c\u3042\u308b\u306e\u3067\u3059\u3002<\/p>\n
\/\/ \u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\u3092\u5b9a\u7fa9<\/span>\r\nstatic<\/span> mut<\/span> TAX<\/span>:<\/span> f32<\/span> =<\/span> 0.1<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    \/\/ \u5b89\u5168\u3067\u306a\u3044\u3053\u3068\u3092\u5ba3\u8a00<\/span>\r\n    unsafe<\/span> {<\/span>\r\n        \/\/ \u53ef\u5909\u306a\u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\u3092\u4f7f\u3046<\/span>\r\n        println!<\/span>(<\/span>\"Price: {}\"<\/span>,<\/span> TAX<\/span> *<\/span> 300.0<\/span>);<\/span>\r\n        \/\/ static\u306a\u5909\u6570\u3092\u5909\u66f4\u3059\u308b<\/span>\r\n        TAX<\/span> =<\/span> 0.08<\/span>;<\/span>\r\n        println!<\/span>(<\/span>\"Price: {}\"<\/span>,<\/span> TAX<\/span> *<\/span> 300.0<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3057\u304b\u3057\u3001unsafe\u306f\u3001\u5b89\u5168\u3067\u306a\u3044\u305f\u3081\u306b\u3001\u3053\u306e\u4ed5\u7d44\u307f\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u308f\u3051\u3067\u3001\u4f7f\u308f\u306a\u3044\u65b9\u304c\u826f\u3044\u3067\u3057\u3087\u3046\u3002\u307e\u305f\u3001unsafe\u5185\u306f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3067\u3082\u306a\u3044\u305f\u3081\u3001\u521d\u671f\u5316\u51e6\u7406\u306b\u6642\u9593\u304c\u304b\u304b\u308b\u5834\u5408\u306b\u3001\u5185\u5bb9\u3092\u58ca\u3057\u3066\u3057\u307e\u3046\u53ef\u80fd\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u95a2\u6570\u306e\u5f15\u6570\u306b\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u4e0e\u3048\u308b\u306e\u304c\u57fa\u672c<\/h2>\n
\u305d\u308c\u3067\u306f\u3001\u3042\u308b\u7a0b\u5ea6\u306e\u898f\u6a21\u306e\u30a2\u30d7\u30ea\u3092\u4f5c\u308b\u5834\u5408\u3001\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u3084\u305d\u306e\u4ed6\u3001\u3044\u308d\u3044\u308d\u306a\u30d1\u30fc\u30c4\u5168\u4f53\u3067\u4f7f\u3046\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u306a\u3069\u3069\u306e\u3088\u3046\u306b\u53d7\u3051\u6e21\u3057\u305f\u3089\u826f\u3044\u306e\u3067\u3057\u3087\u3046\u304b\u3002\u7c21\u5358\u306a\u89e3\u6c7a\u4f5c\u3067\u306f\u3001\u57fa\u672c\u7684\u306b\u306f\u3001\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3068\u3057\u3066\u6bce\u56de\u3001\u8a2d\u5b9a\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u5f15\u304d\u7d99\u3044\u3067\u4e0e\u3048\u308b\u306e\u304c\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n
\/\/ \u5168\u4f53\u3067\u4f7f\u3046\u30c7\u30fc\u30bf<\/span>\r\npub<\/span> struct<\/span> AppContext<\/span> {<\/span>\r\n  pub<\/span> title<\/span>:<\/span> String<\/span>,<\/span>\r\n  pub<\/span> log_level<\/span>:<\/span> usize<\/span>,<\/span>\r\n  \/\/ ...<\/span>\r\n}<\/span>\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n  let<\/span> context<\/span> =<\/span> AppContext<\/span>::<\/span>new<\/span>();<\/span>\r\n  foo<\/span>(<\/span>&<\/span>mut<\/span> context<\/span>);<\/span>\r\n}<\/span>\r\n\/\/ \u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u4f7f\u3046\u95a2\u65701\u306a\u3069<\/span>\r\npub<\/span> fn<\/span> foo<\/span>(<\/span>context<\/span>:<\/span> &<\/span>mut<\/span> AppContext<\/span>)<\/span> {<\/span>\r\n  \/\/ ...<\/span>\r\n  bar<\/span>(<\/span>context<\/span>,<\/span> data<\/span>);<\/span>\r\n  \/\/ ...<\/span>\r\n}<\/span>\r\n\/\/ \u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u4f7f\u3046\u95a2\u65702\u306a\u3069<\/span>\r\npub<\/span> fn<\/span> bar<\/span>(<\/span>context<\/span>:<\/span> &<\/span>mut<\/span> AppContext<\/span>,<\/span> data<\/span>:<\/span> usize<\/span>)<\/span> {<\/span>\r\n  \/\/ ...<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3057\u304b\u3057\u3001\u6bce\u56de\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u53d7\u3051\u6e21\u3059\u306e\u304c\u9762\u5012\u3067\u3059\u3088\u306d\u3002<\/p>\n
\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u52d5\u7684\u306a\u5dee\u3057\u66ff\u3048\u3067\u5b9f\u73fe\u3059\u308b\u65b9\u6cd51<\/h1>\n
\u305d\u308c\u3067\u3001thread_local!\u30de\u30af\u30ed\u3068Arc\/RwLock\u3092\u4f7f\u3046\u65b9\u6cd5\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u72b6\u614b\u3092\u5909\u66f4\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u65b0\u3057\u3044\u72b6\u614b\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5dee\u3057\u66ff\u3048\u308b\u3068\u3044\u3046\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n
use<\/span> std<\/span>::<\/span>sync<\/span>::{<\/span>Arc<\/span>,<\/span> RwLock<\/span>};<\/span>\r\n\r\n\/\/ \u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u8a2d\u5b9a\u5185\u5bb9\u3092\u5b9a\u7fa9<\/span>\r\n#[derive(Default)]<\/span>\r\nstruct<\/span> Config<\/span> {<\/span>\r\n    pub<\/span> debug_mode<\/span>:<\/span> bool<\/span>,<\/span>\r\n}<\/span>\r\nimpl<\/span> Config<\/span> {<\/span>\r\n    \/\/ \u8a2d\u5b9a\u306e\u53c2\u7167<\/span>\r\n    pub<\/span> fn<\/span> current<\/span>()<\/span> -><\/span> Arc<\/span><<\/span>Config<\/span>><\/span> {<\/span>\r\n        CURRENT_CONFIG<\/span>.with<\/span>(|<\/span>c<\/span>|<\/span> c<\/span>.read<\/span>()<\/span>.unwrap<\/span>()<\/span>.clone<\/span>())<\/span>\r\n    }<\/span>\r\n    \/\/ \u8a2d\u5b9a\u3092\u4e0a\u66f8\u304d<\/span>\r\n    pub<\/span> fn<\/span> make_current<\/span>(<\/span>self<\/span>)<\/span> {<\/span>\r\n        CURRENT_CONFIG<\/span>.with<\/span>(|<\/span>c<\/span>|<\/span> *<\/span>c<\/span>.write<\/span>()<\/span>.unwrap<\/span>()<\/span> =<\/span> Arc<\/span>::<\/span>new<\/span>(<\/span>self<\/span>))<\/span>\r\n    }<\/span>\r\n}<\/span>\r\nthread_local!<\/span> {<\/span>\r\n    static<\/span> CURRENT_CONFIG<\/span>:<\/span> RwLock<\/span><<\/span>Arc<\/span><<\/span>Config<\/span>>><\/span> =<\/span> RwLock<\/span>::<\/span>new<\/span>(<\/span>Default<\/span>::<\/span>default<\/span>());<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    \/\/ \u8a2d\u5b9a\u3092\u66f8\u304d\u63db\u3048<\/span>\r\n    Config<\/span> {<\/span> debug_mode<\/span>:<\/span> true<\/span> }<\/span>.make_current<\/span>();<\/span>\r\n    \/\/ \u8a2d\u5b9a\u3092\u53c2\u7167<\/span>\r\n    if<\/span> Config<\/span>::<\/span>current<\/span>()<\/span>.debug_mode<\/span> {<\/span>\r\n        \/\/ do something<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u30b5\u30a4\u30c8\u3088\u308a\u629c\u7c8b\u3057\u305f\u3082\u306e\u3067\u3059\u3002<\/p>\n
 <\/p>\n
\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u52d5\u7684\u306a\u5dee\u3057\u66ff\u3048\u3067\u5b9f\u73fe\u3059\u308b\u65b9\u6cd52<\/h1>\n
\u306a\u304a\u3001\u4f3c\u305f\u3088\u3046\u306a\u624b\u6cd5\u3067\u3059\u304c\u4e0b\u8a18\u306e\u3088\u3046\u306a\u5b9f\u88c5\u4f8b\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u3061\u3089\u306f\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u521d\u671f\u5316\u306f\u4e00\u5ea6\u304d\u308a\u3067\u3001\u305d\u306e\u5f8c\u3001\u69cb\u9020\u4f53\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3092Mutex\u306b\u3057\u3066\u66f8\u304d\u63db\u3048\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n
use<\/span> std<\/span>::<\/span>sync<\/span>::{<\/span>Arc<\/span>,<\/span> Mutex<\/span>};<\/span>\r\n\r\n#[derive(Default)]<\/span>\r\nstruct<\/span> Singleton<\/span> {<\/span>\r\n    count<\/span>:<\/span> Mutex<\/span><<\/span>u8<\/span>><\/span>\r\n}<\/span>\r\n\r\nimpl<\/span> Singleton<\/span> {<\/span>\r\n    pub<\/span> fn<\/span> get_instance<\/span>()<\/span> -><\/span> Arc<\/span><<\/span>Singleton<\/span>><\/span> {<\/span>\r\n        SINGLETON_POOL<\/span>.with<\/span>(|<\/span>singleton_pool<\/span>|<\/span> singleton_pool<\/span>.clone<\/span>())<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nthread_local!<\/span> {<\/span>\r\n    static<\/span> SINGLETON_POOL<\/span>:<\/span> Arc<\/span><<\/span>Singleton<\/span>><\/span> =<\/span> Arc<\/span>::<\/span>new<\/span>(<\/span>Default<\/span>::<\/span>default<\/span>());<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> instance_and_use_singleton<\/span>()<\/span> {<\/span>\r\n    let<\/span> singleton<\/span> =<\/span> Singleton<\/span>::<\/span>get_instance<\/span>();<\/span>\r\n    let<\/span> mut<\/span> count<\/span> =<\/span> singleton<\/span>.count<\/span>.try_lock<\/span>()<\/span>.unwrap<\/span>();<\/span>\r\n    println!<\/span>(<\/span>\"singleton init value: {}\"<\/span>,<\/span> count<\/span>);<\/span>\r\n    *<\/span>count<\/span> +=<\/span> 1<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"singleton end value: {}\"<\/span>,<\/span> count<\/span>);<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    instance_and_use_singleton<\/span>();<\/span>\r\n    instance_and_use_singleton<\/span>();<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306f\u4e0b\u8a18\u306e\u30b5\u30a4\u30c8\u304b\u3089\u306e\u629c\u7c8b\u3067\u3059\u3002<\/p>\n
 <\/p>\n
\u306a\u304a\u3001Mutx\u3068RwLock\u306e\u9055\u3044\u306b\u95a2\u3057\u3066\u306f\u4ee5\u4e0b\u304c\u5206\u304b\u308a\u3084\u3059\u304b\u3063\u305f\u3067\u3059\u3002<\/p>\n
 <\/p>\n
    \n
  • \n
      Mutex … \u30ea\u30bd\u30fc\u30b9\u306e\u5229\u7528\u8005\u306f\u3001 \u8aad\u307f\u66f8\u304d\u95a2\u308f\u3089\u305a1\u4eba\u3060\u3051<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        RwLock … \u66f8\u304d\u8fbc\u307f\u306f1\u4eba \u8aad\u307f\u8fbc\u307f\u3060\u3051\u8907\u6570\u4eba\u306b\u8a31\u3059<\/ul>\n
        lazy-static\u30af\u30ec\u30fc\u30c8\u3092\u4f7f\u3046\u65b9\u6cd5<\/h1>\n
        lazy-static\u30af\u30ec\u30fc\u30c8\u306f\u4e0b\u8a18\u306e\u3088\u3046\u306b\u5229\u7528\u3057\u307e\u3059\u3002lazy-static\u3092\u4f7f\u3046\u306e\u304c\u4eca\u306e\u3068\u3053\u308d\u4eba\u6c17\u304c\u3042\u308a\u307e\u3059\u304c\u3001once_cell\u306f\u30de\u30af\u30ed\u3092\u4f7f\u308f\u306a\u3044\u3068\u3044\u3046\u3053\u3068\u3067\u3001once_cell\u306b\u6d41\u308c\u304c\u79fb\u3063\u3066\u304d\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n
        use lazy_static::lazy_static; \/\/ 1.4.0\r\nuse std::sync::Mutex;\r\n\r\nlazy_static! {\r\n    static ref ARRAY: Mutex<Vec<u8>> = Mutex::new(vec![]);\r\n}\r\n\r\nfn do_a_call() {\r\n    ARRAY.lock().unwrap().push(1);\r\n}\r\n\r\nfn main() {\r\n    do_a_call();\r\n    do_a_call();\r\n    do_a_call();\r\n\r\n    println!(\"called {}\", ARRAY.lock().unwrap().len());\r\n}\r\n<\/code><\/pre>\n
        \u305d\u306e\u4ed6\u306e\u60c5\u5831<\/h1>\n
        (\u53c2\u8003) How do I create a global, mutable singleton?<\/p>\n
         <\/p>\n
        (\u53c2\u8003) MaybeUninit \/ Mutex \/ Once \u3092\u4f7f\u3046\u65b9\u6cd5<\/p>\n
         <\/p>\n
        (\u53c2\u8003) Rust\u3067\u53ef\u5909 Singleton\u3057\u305f\u3044\u3093\u3060\u3051\u3069\u3001\u3069\u3046\u3057\u305f\u3089\u3044\u3044\uff1f<\/p>\n
         <\/p>\n
        (\u53c2\u8003) lazy_static \u306f\u3082\u3046\u53e4\u3044\uff01\uff1f once_cell \u3092\u4f7f\u304a\u3046<\/p>\n
         <\/p>\n
        (\u53c2\u8003) Rust\u306estatic\u5909\u6570\u3068thread local<\/p>\n
         <\/p>\n","protected":false},"excerpt":{"rendered":"
        \u5f8c\u5b66\u306e\u305f\u3081\u306bRust\u3067Singleton\u3092\u5b9f\u73fe\u3059\u308b\u65b9\u6cd5\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002\u6539\u3081\u3066\u8abf\u3079\u76f4\u3059\u3068\u3001\u3044\u308d\u3044\u308d\u306a\u65b9\u6cd5\u304c\u3042\u3063\u3066 […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45650","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\/45650-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"\u5f8c\u5b66\u306e\u305f\u3081\u306bRust\u3067Singleton\u3092\u5b9f\u73fe\u3059\u308b\u65b9\u6cd5\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002\u6539\u3081\u3066\u8abf\u3079\u76f4\u3059\u3068\u3001\u3044\u308d\u3044\u308d\u306a\u65b9\u6cd5\u304c\u3042\u3063\u3066 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45650-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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