{"id":45149,"date":"2022-11-07T16:08:25","date_gmt":"2023-02-17T18:59:12","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45149-2\/"},"modified":"2024-04-28T23:30:11","modified_gmt":"2024-04-28T15:30:11","slug":"45149-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45149-2\/","title":{"rendered":""},"content":{"rendered":"

\u6982\u8981<\/h2>\n

RUST\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u540c\u58eb\u306e\u76f8\u4e92\u53c2\u7167\u3092(\u7121\u7406\u3084\u308a)\u3084\u308b\u305f\u3081\u306e\u65b9\u6cd5\uff0e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u3067GC\u304c\u3042\u308b\u8a00\u8a9e\u3067\u306f\uff0c\u3054\u304f\u666e\u901a\u306b\u3084\u308a\u305d\u3046\u306a\u69cb\u9020\u3067\u3059\u304c\uff0cRUST\u3067\u3084\u308d\u3046\u3068\u3059\u308b\u3068\u7d50\u69cb\u305f\u3044\u3078\u3093\uff0e\u5927\u5909\u3068\u3044\u3046\u3053\u3068\u306f\u57fa\u672c\u7684\u306b\u3084\u3063\u3066\u306f\u3044\u3051\u306a\u3044\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u3060\u3068\u601d\u3046\u3051\u308c\u3069\u3082\uff0c\u305b\u3063\u304b\u304f\u3067\u304d\u305f\u306e\u3067\uff0c\u8a18\u9332\u3068\u3057\u3066\u6b8b\u3057\u3066\u304a\u304f\uff0e<\/p>\n

\u76ee\u7684<\/h3>\n

\u305d\u3082\u305d\u3082\u306a\u305c\u76f8\u4e92\u53c2\u7167\u3092\u3057\u305f\u304b\u3063\u305f\u304b\uff0c\u3068\u3044\u3046\u3068\uff0c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u540c\u58eb\u3092\u76f8\u4e92\u53c2\u7167\u3057\uff0c\u304a\u4e92\u3044\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u5408\u3044\u306a\u304c\u3089\u30c7\u30fc\u30bf\u306e\u66f4\u65b0\u3092\u3057\u305f\u304b\u3063\u305f\u304b\u3089\uff0e\u5177\u4f53\u7684\u306bJava\u98a8\u306b\u66f8\u304f\u3068<\/p>\n

class<\/span> Parent<\/span> {<\/span>\r\n    byte<\/span>[]<\/span> data<\/span>;<\/span>\r\n    Child<\/span> child<\/span>;<\/span>\r\n\r\n    void<\/span> Parent<\/span>()<\/span> {<\/span>\r\n        data<\/span> =<\/span> new<\/span> byte<\/span>[<\/span>100<\/span>];<\/span>\r\n        child<\/span> =<\/span> new<\/span> Child<\/span>(<\/span>this<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> byte<\/span>[]<\/span> read<\/span>(<\/span>int<\/span> begin<\/span>,<\/span> int<\/span> end<\/span>)<\/span> {<\/span> ...<\/span> }<\/span> \/\/ data\u304b\u3089\u3042\u308b\u7bc4\u56f2\u306e\u30d0\u30a4\u30c8\u5217\u3092\u8aad\u3093\u3067\u8fd4\u3059<\/span>\r\n    public<\/span> void<\/span> write<\/span>(<\/span>int<\/span> idx<\/span>,<\/span> byte<\/span>[]<\/span> val<\/span>)<\/span> {<\/span> ...<\/span> }<\/span> \/\/ data\u306eidx\u304b\u3089val\u3092\u66f8\u304d\u8fbc\u3080<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> Child<\/span> {<\/span>\r\n    Parent<\/span> parent<\/span>;<\/span>\r\n    void<\/span> Child<\/span>(<\/span>Parent<\/span> parent<\/span>)<\/span> {<\/span>\r\n        this<\/span>.<\/span>parent<\/span> =<\/span> parent<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> byte<\/span>[]<\/span> readData<\/span>(<\/span>int<\/span> idx<\/span> int<\/span> len<\/span>)<\/span> {<\/span>\r\n        return<\/span> parent<\/span>.<\/span>read<\/span>(<\/span>idx<\/span>,<\/span> idx<\/span>+<\/span>len<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u3092RUST\u3067\u3084\u308d\u3046\u3068\u3059\u308b\u3068\u975e\u5e38\u306b\u5927\u5909\uff0e<\/p>\n
\u5927\u5909\u306a\u7406\u7531<\/h3>\n
\u3053\u306e\u69cb\u9020\u304cRUST\u3067\u5927\u5909\u306a\u306e\u306f\uff0c\u4ee5\u4e0b\u306e\u7406\u7531\u3060\u3068\u7d50\u8ad6\u3065\u3051\u305f\uff0e<\/p>\n
    \n
  1. \n
      RAII\u3068\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf<\/ol>\n<\/li>\n<\/ol>\n
       <\/p>\n
        \n
      1. \n
          \u6240\u6709\u6a29<\/ol>\n<\/li>\n<\/ol>\n
           <\/p>\n
            \u4e0d\u5909\u30fb\u53ef\u5909\u53c2\u7167\u306e\u5236\u7d04<\/ol>\n
            RAII\u3068\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf<\/h4>\n
            RAII (Resource Acquisition Is Initialization) \u3068\u306f\u30ea\u30bd\u30fc\u30b9\u306e\u78ba\u4fdd\u3092\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u521d\u671f\u5316\u6642\u306b\u884c\u3044\uff0c\u30ea\u30bd\u30fc\u30b9\u306e\u958b\u653e\u3092\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u7834\u68c4\u3068\u540c\u6642\u306b\u884c\u3046\u3053\u3068\uff0e\u4e0a\u306e\u30b3\u30fc\u30c9\u306e\u4f8b\u3067\u8a00\u3048\u3070\uff0cParent\u4f5c\u6210\u6642\u306bChild\u3092\u4f5c\u6210\u3057\uff0c\u305d\u306e\u53c2\u7167\u3068byte[]\u3092\u521d\u671f\u5316\u3057\u3066\u3044\u308b\uff0e\u307e\u305f\uff0cChild\u751f\u6210\u6642\u306bParent\u306e\u53c2\u7167\u3092\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306b\u6e21\u3057\u3066\u3044\u308b\uff0eJava\u306b\u306f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u3042\u308b\u306e\u3067\u96e3\u306a\u304f\u3053\u306e\u69cb\u9020\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u304c\uff0cRUST\u306b\u306f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u3044\u3046\u4ed5\u7d44\u307f\u304c\u5b58\u5728\u3057\u306a\u3044\uff0e\u305d\u306e\u4ee3\u308f\u308a\uff0cRUST\u3067\u306fnew()\u3068\u3044\u3046\u95a2\u9023\u95a2\u6570\u3092\u4f5c\u3063\u3066\u521d\u671f\u5316\u3059\u308b\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u3066\u3044\u308b\uff0e\u3057\u304b\u3057\uff0c\u3053\u306enew\u306f\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u306a\u3044\u306e\u3067\uff0c\u305d\u306e\u4e2d\u3067self\u304c\u4f7f\u3048\u306a\u3044\uff0e\u3068\u3044\u3046\u3053\u3068\u306f\uff0cParent\u304cChild\u3092\u4f5c\u308b\u3068\u304d\u306b\u306f\u81ea\u8eab\u306e\u53c2\u7167\u304c\u5fc5\u8981\u3060\u304c\uff0c\u305d\u306e\u6642\u70b9\u3067\u306f\u307e\u3060Parent\u306f\u751f\u6210\u3055\u308c\u3066\u3044\u306a\u3044\uff0c\u3068\u3044\u3046\u9d8f\u3068\u5375\u306e\u3088\u3046\u306a\u77db\u76fe\u304c\u751f\u3058\u308b\uff0e\u3053\u306e\u77db\u76fe\u3092\u89e3\u6d88\u3059\u308b\u306b\u306f\uff0c\u304a\u4e92\u3044\u306e\u751f\u6210\u6642\u306b\u306f\u4e00\u65e6NULL\u306b\u3057\u3066\u304a\u3044\u3066\uff0c\u3042\u3068\u304b\u3089\u30bb\u30c3\u30c8\u3059\u308b\uff0c\u3068\u3044\u3046\u6226\u7565\u3092\u53d6\u308b\u3057\u304b\u306a\u3044\u306e\u3067\uff0c\u5f8c\u8ff0\u3059\u308b\u3088\u3046\u306bOption\u3092\u4f7f\u3046\u3057\u304b\u306a\u3044\u304c\uff0c\u3053\u306eOption\u306e\u6271\u3044\u3082\u4e00\u82e6\u52b4\uff0e\uff0e\uff0e<\/p>\n
            \u6240\u6709\u6a29<\/h4>\n
            RUST\u3067\u306f\uff0c\u5024\u306e\u6240\u6709\u8005\u306f1\u4eba\u3060\u3051\u3067\uff0c\u57fa\u672c\u304cmove\u30bb\u30de\u30f3\u30c6\u30a3\u30af\u30b9\uff0c\u305d\u3057\u3066\u4ed6\u306e\u95a2\u6570\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u4e00\u6642\u7684\u306b\u5229\u7528\u3055\u305b\u308b\u305f\u3081\u306b\u501f\u7528\u3068\u3044\u3046\u4ed5\u7d44\u307f\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u308b(\u8a73\u7d30\u306f\u7701\u7565)\uff0e\u306a\u306e\u3067\uff0c\u304a\u4e92\u3044\u306b\u53c2\u7167\u3092\u53d6\u308a\u5408\u3046\u69cb\u9020\u306e\u5834\u5408\uff0c<\/p>\n
            struct<\/span> A<\/span> {<\/span>\r\n    valb<\/span>:<\/span> &<\/span>B<\/span>\r\n}<\/span>\r\n\r\nstruct<\/span> B<\/span> {<\/span>\r\n    vala<\/span>:<\/span> &<\/span>A<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
            \u306e\u3088\u3046\u306a\u69cb\u9020\u306b\u306a\u308b\u304c\uff0cRUST\u3067\u306f\u69cb\u9020\u4f53\u306b\u53c2\u7167\u3092\u53d6\u308b\u3053\u3068\u306f\u63a8\u5968\u3055\u308c\u3066\u3044\u306a\u3044\uff0e\u3053\u308c\u306f\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0\u306e\u6982\u5ff5\u304c\u3042\u308b\u304b\u3089\u3067\uff0c\u5024\u306e\u5b9f\u614b\u306f\u53c2\u7167\u3088\u308a\u3082\u9577\u3044\u3053\u3068\u304c\u4fdd\u8a3c\u3055\u308c\u3066\u3044\u306a\u3051\u308c\u3070\u306a\u3089\u305a\uff0c\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u305d\u308c\u304c\u78ba\u8a8d\u3067\u304d\u306a\u3044\u3068\u3044\u3051\u306a\u3044\uff0e\u3053\u306e\u5236\u7d04\u3092\u30b3\u30f3\u30d1\u30a4\u30e9\u306b\u30c1\u30a7\u30c3\u30af\u3055\u305b\u308b\u305f\u3081\u306b\uff0cRUST\u306f\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u5fc5\u8981\u3068\u3057\uff0c\u3053\u308c\u304c\u5165\u308b\u3068\u3084\u3084\u3053\u3057\u304f\u306a\u308b(\u3060\u304b\u3089\u63a8\u5968\u3055\u308c\u3066\u306a\u3044\uff1f)\uff0e\u5358\u7d14\u306a\u30c7\u30fc\u30bf\u578b\u306a\u3089\u3070\u3042\u307e\u308a\u96e3\u3057\u304f\u306a\u3044\u304c\uff0c\u69cb\u9020\u4f53\u306e\u5834\u5408\u306f\u5185\u90e8\u306b\u4ed6\u306e\u30c7\u30fc\u30bf\u578b\u3092\u5185\u5305\u3057\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u9ad8\u304f\uff0c\u518d\u5e30\u7684\u306b\u30c7\u30fc\u30bf\u306e\u6240\u6709\u8005\u3084\u501f\u7528\u30eb\u30fc\u30eb\u3092\u8003\u3048\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\uff0e
            \n\u3088\u3063\u3066\uff0c\u6b63\u78ba\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u66f8\u304b\u304b\u3051\u308c\u3070\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308b<\/p>\n
            struct<\/span> A<\/span><<\/span>'a<\/span>><\/span> {<\/span>\r\n    valb<\/span>:<\/span> &<\/span>'a<\/span> B<\/span>\r\n}<\/span>\r\n\r\nstruct<\/span> B<\/span><<\/span>'b<\/span>><\/span> {<\/span>\r\n    vala<\/span>:<\/span> &<\/span>'b<\/span> A<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
            \u3068\u306f\u3044\u3048\uff0c\u53c2\u7167\u3092\u6301\u305f\u305b\u306a\u3051\u308c\u3070\u3044\u3051\u306a\u3044\u306e\u3067\uff0c\u3053\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\uff0e<\/p>\n
            \u4e0d\u5909\u30fb\u53ef\u5909\u53c2\u7167\u306e\u5236\u7d04<\/h3>\n
            RUST\u306e\u53c2\u7167\u306f<\/p>\n
              \n
            1. \n
                \u4e0d\u5909\u53c2\u7167\u306f\u4f55\u500b\u3067\u3082\u540c\u6642\u306b\u751f\u6210\u53ef\u80fd<\/ol>\n<\/li>\n<\/ol>\n
                 <\/p>\n
                  \n
                1. \n
                    \u53ef\u5909\u53c2\u7167\u306f1\u3064\u3060\u3051<\/ol>\n<\/li>\n<\/ol>\n
                     <\/p>\n
                      \u4e0d\u5909\u53c2\u7167\u3068\u53ef\u5909\u53c2\u7167\u304c\u540c\u6642\u306b\u306f\u5b58\u5728\u3067\u304d\u306a\u3044<\/ol>\n
                      \u3068\u3044\u3046\u5236\u7d04\u304c\u3042\u308b\uff0e\u4eca\u56de\u306e\u3088\u3046\u306b\uff0c\u53c2\u7167\u3092\u5225\u306e\u69cb\u9020\u4f53\u306b\u542b\u3081\u308b\u3088\u3046\u306a\u8a2d\u8a08\u306e\u5834\u5408\uff0c\u81ea\u7531\u306b\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u5408\u3044\u305f\u3044\u3057\uff0c\u3068\u304d\u306b\u306f\u53c2\u7167\u5148\u304c\u5185\u5305\u3059\u308b\u30c7\u30fc\u30bf\u3092\u66f4\u65b0\u3057\u305f\u3044\uff0c\u3068\u3044\u3046\u8981\u6c42\u304c\u767a\u751f\u3059\u308b(Java\u306e\u4f8b\u3067\uff0cParent\u306ewrite\u3092\u547c\u3073\u51fa\u3059\u3088\u3046\u306a\u30b1\u30fc\u30b9)\uff0e\u3053\u306e\u3068\u304d\u306b\u306f\u53ef\u5909\u53c2\u7167\u304c\u5fc5\u8981\u3067\uff0c\u3060\u304b\u3089\u3068\u3044\u3063\u3066<\/p>\n
                      struct<\/span> A<\/span><<\/span>'a<\/span>><\/span> {<\/span>\r\n    valb<\/span>:<\/span> &<\/span>'a<\/span> mut<\/span> B<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                      \u3053\u3093\u306a\u3053\u3068\u3057\u305f\u3089B\u306e\u4e0d\u5909\u53c2\u7167\u306f\u4f5c\u308c\u306a\u304f\u306a\u308a(\u3082\u3061\u308d\u3093\u53ef\u5909\u53c2\u7167\u3082)\uff0c\u4f7f\u3044\u7269\u306b\u306a\u3089\u306a\u3044\uff0e<\/p>\n
                      \u89e3\u6c7a\u7b56<\/h2>\n
                      \u3053\u306e\u69cb\u9020\u3092\u5b9f\u73fe\u3059\u308b\u306e\u306b\u4f7f\u3063\u305f\u306e\u306f\u4ee5\u4e0b\u306e3\u3064<\/p>\n
                        \n
                      1. \n
                          Option<\/ol>\n<\/li>\n<\/ol>\n
                           <\/p>\n
                            \n
                          1. \n
                              Rc<\/ol>\n<\/li>\n<\/ol>\n
                               <\/p>\n
                                RefCell<\/ol>\n
                                \u3054\u304f\u7c21\u5358\u306b\u3053\u308c\u3089\u306e\u8aac\u660e\u3092\u3057\u305f\u5f8c\uff0c\u5177\u4f53\u7684\u306a\u30b3\u30fc\u30c9\u3092\u793a\u3059\uff0e<\/p>\n
                                Option<\/h4>\n
                                Rust\u3067NULL\u3092\u8868\u3059\u305f\u3081\u306b\u7528\u3044\u3089\u308c\u308b\u5217\u6319\u578b\uff0e\u76f8\u4e92\u53c2\u7167\u3059\u308b\u306e\u3067\uff0c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210\u6642\u306b\u306f\u304a\u4e92\u3044\u306e\u53c2\u7167\u3092NULL\u306b\u3057\u3066\u304a\u304d\uff0c\u3042\u3068\u304b\u3089\u30bb\u30c3\u30c8\u3059\u308b\u305f\u3081\u306b\u4f7f\u3046<\/p>\n
                                Rc<\/h4>\n
                                Rust\u3067\u8907\u6570\u306e\u5909\u6570\u306b\u6240\u6709\u6a29\u3092\u4e0e\u3048\u308b\u305f\u3081\u5229\u7528\u3059\u308b\uff0eRc\u5185\u90e8\u3067\u306f\u53c2\u7167\u30ab\u30a6\u30f3\u30bf\u3067\u53c2\u7167\u6570\u3092\u4fdd\u6301\u3057\uff0c\u53c2\u7167\u6570\u304c0\u306b\u306a\u3063\u305f\u3068\u304d\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u7834\u68c4\u3059\u308b\uff0e\u3053\u3093\u306a\u3075\u3046\u306b\u4f7f\u3046<\/p>\n
                                let<\/span> orig<\/span> =<\/span> Rc<\/span>::<\/span>new<\/span>(<\/span>Hoge<\/span>::<\/span>new<\/span>())<\/span> \/\/ Hoge\u304c\u5171\u6709\u3057\u305f\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/span>\r\nlet<\/span> ref<\/span> =<\/span> Rc<\/span>::<\/span>clone<\/span>(<\/span>orig<\/span>)<\/span>       \/\/ orig\u3068ref\u306e\u578b\u306f\u540c\u3058\u3067\uff0cRc<Hoge>\u306b\u306a\u308b\uff0e<\/span>\r\n<\/code><\/pre>\n
                                \u3053\u308c\u3092\u4f7f\u3063\u3066\uff0c\u8907\u6570\u7b87\u6240\u3067\u3042\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u53c2\u7167\u3092\u4fdd\u6301\u3059\u308b<\/p>\n
                                RefCell<\/h4>\n
                                (\u53ef\u5909)\u53c2\u7167\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u3067\u306f\u306a\u304f\uff0c\u5b9f\u884c\u6642\u306b\u30c1\u30a7\u30c3\u30af\u3057\u3066\u53d6\u5f97\u3067\u304d\u308b\u4ed5\u7d44\u307f\uff0e\u4e0d\u5909\u53c2\u7167\u306fborrow()\uff0c\u53ef\u5909\u53c2\u7167\u306fborrow_mut()\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u3067\u53d6\u5f97\u3059\u308b\uff0e\u3053\u3093\u306a\u3075\u3046\u306b\u4f7f\u3046<\/p>\n
                                struct<\/span> A<\/span> {<\/span>\r\n   name<\/span>:<\/span> String<\/span>\r\n}<\/span>\r\n\r\nlet<\/span> a<\/span>:<\/span>A<\/span>  =<\/span> A<\/span>{<\/span>name<\/span>:<\/span> \"abc\"<\/span>.to_string<\/span>()}<\/span>\r\na<\/span>.name<\/span>.push<\/span>(<\/span>'d'<\/span>)<\/span> \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc<\/span>\r\n<\/code><\/pre>\n
                                \u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\uff0ca\u304c\u4e0d\u5909\u306a\u306e\u3067\uff0ca.name.push(‘d’)\u304c\u547c\u3079\u306a\u3044\uff0e\u3053\u308c\u3092\u547c\u3076\u305f\u3081\u306b\u306f<\/p>\n
                                let<\/span> mut<\/span> a<\/span>:<\/span>A<\/span> ...<\/span>\r\n<\/code><\/pre>\n
                                \u3053\u306e\u3088\u3046\u306b\uff0ca\u3092\u53ef\u5909\u306b\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\uff0e
                                \n\u3068\u3053\u308d\u304c\uff0cRefCell\u3092\u4f7f\u3046\u3068<\/p>\n
                                struct<\/span> A<\/span> {<\/span>\r\n    name<\/span>:<\/span>RefCell<\/span><<\/span>String<\/span>><\/span>\r\n}<\/span>\r\n\r\nlet<\/span> a<\/span>:<\/span>A<\/span> =<\/span> A<\/span> {<\/span>name<\/span>:<\/span> RefCell<\/span>::<\/span>new<\/span>(<\/span>\"abc\"<\/span>.to_string<\/span>())}<\/span>\r\na<\/span>.name<\/span>.borrow_mut<\/span>()<\/span>.push<\/span>(<\/span>'d'<\/span>);<\/span>\r\n<\/code><\/pre>\n
                                \u3053\u306e\u3088\u3046\u306b\uff0ca\u304c\u4e0d\u5909\u3067\u3042\u3063\u3066\u3082\uff0c\u5b9f\u884c\u6642\u306bname\u306e\u53ef\u5909\u53c2\u7167\u3092\u53d6\u5f97\u3057\u3066\u53ef\u5909\u53c2\u7167\u304c\u5fc5\u8981\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u308b\uff0e\u3053\u308c\u3092\u4f7f\u3063\u3066\uff0c\u53ef\u5909\u53c2\u7167\u306b\u3059\u308b\u3053\u3068\u306a\u304f\u53c2\u7167\u3092\u6301\u3061\u5408\u3046\uff0e<\/p>\n
                                \u5b9f\u88c5\u4f8b<\/h2>\n
                                use<\/span> std<\/span>::<\/span>rc<\/span>::<\/span>Rc<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>cell<\/span>::<\/span>RefCell<\/span>;<\/span>\r\n\r\n\r\nstruct<\/span> TestA<\/span> {<\/span>\r\n    valb<\/span>:<\/span> Option<\/span><<\/span>Rc<\/span><<\/span>RefCell<\/span><<\/span>TestB<\/span>>>><\/span>,<\/span>\r\n}<\/span>\r\n\r\nimpl<\/span> TestA<\/span> {<\/span>\r\n    fn<\/span> new<\/span>()<\/span> -><\/span> Self<\/span> {<\/span>\r\n        TestA<\/span> {<\/span>\r\n            valb<\/span>:<\/span> None<\/span>,<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n    fn<\/span> setB<\/span>(<\/span>&<\/span>mut<\/span> self<\/span>,<\/span> val<\/span>:<\/span> Rc<\/span><<\/span>RefCell<\/span><<\/span>TestB<\/span>>><\/span>)<\/span> {<\/span>\r\n        self<\/span>.valb<\/span>.replace<\/span>(<\/span>val<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n\r\n    fn<\/span> call_b3<\/span>(<\/span>&<\/span>self<\/span>)<\/span> {<\/span>\r\n        if<\/span> let<\/span> Some<\/span>(<\/span>v<\/span>)<\/span> =<\/span> self<\/span>.valb<\/span>.as_ref<\/span>()<\/span> {<\/span> \/\/ as_ref\u304c\u30dd\u30a4\u30f3\u30c8<\/span>\r\n            v<\/span>.borrow<\/span>()<\/span>.ihello<\/span>();<\/span>\r\n            v<\/span>.borrow_mut<\/span>()<\/span>.mhello<\/span>();<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n    fn<\/span> ihelloA<\/span>(<\/span>&<\/span>self<\/span>)<\/span> {<\/span>                      \/\/ \u4e0d\u5909\u53c2\u7167\u306e\u30e1\u30bd\u30c3\u30c9<\/span>\r\n        println!<\/span>(<\/span>\"iHelloA\"<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    fn<\/span> mhelloA<\/span>(<\/span>&<\/span>mut<\/span> self<\/span>)<\/span> {<\/span>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000<\/span>  \/\/ \u53ef\u5909\u53c2\u7167\u304c\u5fc5\u8981\u306a\u30e1\u30bd\u30c3\u30c9<\/span>\r\n        println!<\/span>(<\/span>\"mHelloA\"<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n}<\/span>\r\n\r\nstruct<\/span> TestB<\/span> {<\/span>\r\n    data<\/span>:<\/span>Vec<\/span><<\/span>i32<\/span>><\/span>,<\/span>\r\n    vala<\/span>:<\/span> Option<\/span><<\/span>Rc<\/span><<\/span>RefCell<\/span><<\/span>TestA<\/span>>>><\/span>,<\/span>\r\n}<\/span>\r\n\r\nimpl<\/span> TestB<\/span> {<\/span>\r\n    fn<\/span> new<\/span>()<\/span> -><\/span> Self<\/span> {<\/span>\r\n        TestB<\/span> {<\/span>\r\n            data<\/span>:<\/span> Vec<\/span>::<\/span>new<\/span>(),<\/span>\r\n            vala<\/span>:<\/span> None<\/span>,<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n    fn<\/span> setA<\/span>(<\/span>&<\/span>mut<\/span> self<\/span>,<\/span> val<\/span>:<\/span> Rc<\/span><<\/span>RefCell<\/span><<\/span>TestA<\/span>>><\/span>)<\/span> {<\/span>\r\n        self<\/span>.vala<\/span>.replace<\/span>(<\/span>val<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    fn<\/span> ihello<\/span>(<\/span>&<\/span>self<\/span>)<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"iHello\"<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    fn<\/span> mhello<\/span>(<\/span>&<\/span>mut<\/span> self<\/span>)<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"mHello\"<\/span>);<\/span>\r\n        self<\/span>.data<\/span>.push<\/span>(<\/span>10<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    fn<\/span> call_a1<\/span>(<\/span>&<\/span>self<\/span>)<\/span> {<\/span>        \r\n        if<\/span> let<\/span> Some<\/span>(<\/span>v<\/span>)<\/span> =<\/span> self<\/span>.vala<\/span>.as_ref<\/span>()<\/span> {<\/span>\r\n            v<\/span>.borrow<\/span>()<\/span>.ihelloA<\/span>();<\/span>\r\n            v<\/span>.borrow_mut<\/span>()<\/span>.mhelloA<\/span>();<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> testb<\/span> =<\/span> Rc<\/span>::<\/span>new<\/span>(<\/span>RefCell<\/span>::<\/span>new<\/span>(<\/span>TestB<\/span>::<\/span>new<\/span>()));<\/span>      \/\/ TestB\u3092\u751f\u6210\u3057\uff0cRc RefCell\u3067\u30e9\u30c3\u30d7<\/span>\r\n    let<\/span> testb_ref<\/span>:<\/span> Rc<\/span><<\/span>RefCell<\/span><<\/span>TestB<\/span>>><\/span> =<\/span> Rc<\/span>::<\/span>clone<\/span>(<\/span>&<\/span>testb<\/span>);<\/span> \/\/ testb\u306e\u53c2\u7167\u3092\u751f\u6210(\u6240\u6709\u6a29\u3092\u3082\u3064)<\/span>\r\n\r\n\r\n    let<\/span> testa<\/span> =<\/span> Rc<\/span>::<\/span>new<\/span>(<\/span>RefCell<\/span>::<\/span>new<\/span>(<\/span>TestA<\/span>::<\/span>new<\/span>()));<\/span>     \/\/ TestA\u3092\u751f\u6210\u3057\uff0cRc, RefCell\u3067\u30e9\u30c3\u30d7<\/span>\r\n    let<\/span> testa_ref<\/span> =<\/span> Rc<\/span>::<\/span>clone<\/span>(<\/span>&<\/span>testa<\/span>);<\/span>                   \/\/ testa\u306e\u53c2\u7167\u3092\u751f\u6210(\u6240\u6709\u6a29\u3092\u6301\u3064)<\/span>\r\n    testb<\/span>.borrow_mut<\/span>()<\/span>.setA<\/span>(<\/span>testa_ref<\/span>);<\/span>                  \/\/ TestB\u306bTestA\u3092\u30bb\u30c3\u30c8<\/span>\r\n    testa<\/span>.borrow_mut<\/span>()<\/span>.setB<\/span>(<\/span>Rc<\/span>::<\/span>clone<\/span>(<\/span>&<\/span>testb<\/span>));<\/span>          \/\/ TestA\u306bTestB\u3092\u30bb\u30c3\u30c8<\/span>\r\n    \r\n    println!<\/span>(<\/span>\"--------------\"<\/span>);<\/span>\r\n    testa<\/span>.borrow<\/span>()<\/span>.call_b3<\/span>();<\/span>                            \/\/ TestA\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u884c\uff0e\u5185\u90e8\u3067TestB\u306e\u4e0d\u5909\u53c2\u7167\uff0c\u53ef\u5909\u53c2\u7167\u304c\u5fc5\u8981\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059<\/span>\r\n    testb<\/span>.borrow<\/span>()<\/span>.call_a1<\/span>();<\/span>                            \/\/ TestB\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u884c\uff0e\u5185\u90e8\u3067TestA\u306e\u4e0d\u5909\u53c2\u7167\uff0c\u53ef\u5909\u53c2\u7167\u304c\u5fc5\u8981\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\uff0e<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                                \u57fa\u672c\u7684\u306b\u306f\u3053\u308c\u307e\u3067\u306e\u8aac\u660e\u3068\uff0c\u30b3\u30fc\u30c9\u3092\u898b\u308c\u3070\u308f\u304b\u308b\u3068\u601d\u3046\u3051\u3069\uff0c1\u3064\u3060\u3051\u88dc\u8db3\uff0e\u666e\u901a\uff0cOption\u3067\u4e2d\u8eab\u304cSome\u306e\u6642\uff0cif let Some(v>\u5f0f\u3067\u4e2d\u8eab\u3092\u53d6\u308a\u51fa\u3059\u304c\uff0c\u5b9f\u306f\u3053\u306e\u6642v\u306bT\u304cmove\u3055\u308c\u308b\uff0e\u901a\u5e38\u3067\u3042\u308c\u3070\u554f\u984c\u306a\u3044\u304c\uff0c\u4eca\u56deOption\u306e\u4e2d\u8eab\u306f\u69cb\u9020\u4f53\u304c\u6240\u6709\u8005\u306a\u306e\u3067\uff0c\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u3067\u6240\u6709\u6a29\u306e\u79fb\u52d5\u304c\u8d77\u3053\u308b\u3068\uff0c\u305d\u306e\u5f8cOption\u306e\u4e2d\u8eab\u304c\u4f7f\u3048\u306a\u304f\u306a\u308a\uff0c\u305d\u306e\u305f\u3081\u306b\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u3063\u3066\u3057\u307e\u3046\uff0e
                                \n\u305d\u3053\u3067\uff0c<\/p>\n
                                if<\/span> let<\/span> Some<\/span>(<\/span>v<\/span>)<\/span> =<\/span> self<\/span>.valb<\/span>.as_ref<\/span>()<\/span> {<\/span> \/\/ as_ref\u304c\u30dd\u30a4\u30f3\u30c8<\/span>\r\n<\/code><\/pre>\n
                                \u306e\u3088\u3046\u306b\uff0cOption\u306eas_ref()\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u3067\uff0cOption -> Option<&T>\u3092\u8fd4\u3057\u3066\u3082\u3089\u3044\uff0cif let\u306b\u3064\u306a\u3052\u308b\uff0e\u3053\u3046\u3059\u308b\u3068\uff0c\u6240\u6709\u6a29\u306e\u79fb\u52d5\u304c\u8d77\u3053\u3089\u306a\u3044\u306e\u3067\uff0c\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3092\u56de\u907f\u3067\u304d\u308b<\/p>\n
                                \u7d50\u8ad6<\/h2>\n
                                \u3068\u308a\u3042\u3048\u305a\uff0c\u51fa\u6765\u308b\u3053\u3068\u306f\u51fa\u6765\u308b\u3051\u3069\uff0c\u3042\u307e\u308a\u826f\u304f\u306a\u3044\uff0e\u4eca\u56de\u306e\u3088\u3046\u306b\uff0c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u9593\u3067\u5185\u90e8\u69cb\u9020\u3092\u5909\u66f4\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u306a\u3089\u3070\uff0c\u305d\u306e\u90fd\u5ea6\u53ef\u5909\u53c2\u7167\u3092\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u3068\u3057\u3066\u4e0e\u3048\uff0c\u53ef\u5909\u53c2\u7167\u306f\u305d\u306e\u30e1\u30bd\u30c3\u30c9\u3060\u3051\u3067\u5b8c\u7d50\u3055\u305b\u308b\u3088\u3046\u306a\u8a2d\u8a08\u306b\u3059\u3079\u304d\u3060\u3068\u601d\u3046\uff0e
                                \n\u9593\u9055\u3044\u3084\u3088\u308a\u826f\u3044\u89e3\u6c7a\u7b56\u304c\u3042\u308c\u3070\u305c\u3072\u3054\u6307\u6458\u304f\u3060\u3055\u3044\uff0e<\/p>\n
                                \u53c2\u8003<\/h4>\n
                                  \n
                                1. \n
                                    Rc\u3068Cell\/RefCell\u306e\u95a2\u4fc2<\/ol>\n<\/li>\n<\/ol>\n
                                     <\/p>\n
                                      \n
                                    1. \n
                                        \u76f8\u4e92\u53c2\u7167\u306b\u3064\u3044\u3066\u306e\u8003\u5bdf<\/ol>\n<\/li>\n<\/ol>\n
                                         <\/p>\n
                                          \n
                                        1. \n
                                            Rc\u3068RefCell\u306e\u7406\u89e3\u5ea6<\/ol>\n<\/li>\n<\/ol>\n
                                             <\/p>\n
                                              Rust\u306e\u30b0\u30e9\u30d5\u8868\u73fe<\/ol>\n","protected":false},"excerpt":{"rendered":"
                                              \u6982\u8981 RUST\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u540c\u58eb\u306e\u76f8\u4e92\u53c2\u7167\u3092(\u7121\u7406\u3084\u308a)\u3084\u308b\u305f\u3081\u306e\u65b9\u6cd5\uff0e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u3067GC\u304c\u3042\u308b\u8a00\u8a9e\u3067\u306f\uff0c […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45149","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\/45149-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"\u6982\u8981 RUST\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u540c\u58eb\u306e\u76f8\u4e92\u53c2\u7167\u3092(\u7121\u7406\u3084\u308a)\u3084\u308b\u305f\u3081\u306e\u65b9\u6cd5\uff0e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u3067GC\u304c\u3042\u308b\u8a00\u8a9e\u3067\u306f\uff0c […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45149-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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