{"id":45706,"date":"2023-05-03T21:00:53","date_gmt":"2023-05-25T09:57:05","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45706-2\/"},"modified":"2024-04-30T02:29:21","modified_gmt":"2024-04-29T18:29:21","slug":"45706-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45706-2\/","title":{"rendered":""},"content":{"rendered":"

Rust\u52c9\u5f37\u4e2d\u3002\u73fe\u72b6\u30e1\u30a4\u30f3\u3067\u4f7f\u7528\u3057\u3066\u3044\u308b\u8a00\u8a9e\u306fC\u3002
\nRust\u306e\u52c9\u5f37\u3068\u4f4e\u30ec\u30a4\u30e4\u306e\u52c9\u5f37\u3092\u304b\u306d\u3066\u3001\u300c\u4f4e\u30ec\u30a4\u30e4\u3092\u77e5\u308a\u305f\u3044\u4eba\u306e\u305f\u3081\u306eC\u30b3\u30f3\u30d1\u30a4\u30e9\u4f5c\u6210\u5165\u9580\u300d\u3092Rust\u3067\u5b9f\u88c5\u3057\u3066\u3044\u308b\u304c\u3001C\u306e\u982d\u3067\u66f8\u3053\u3046\u3068\u3057\u305f\u3089\u3064\u307e\u3065\u3044\u305f\u306e\u3067\u30e1\u30e2\u3002<\/p>\n

\u69cb\u9020\u4f53\u3092\u5b9a\u7fa9\u3059\u308b<\/h2>\n

\u5b9f\u88c5\u3057\u305f\u3044\u30c7\u30fc\u30bf\u69cb\u9020\u306fC\u3060\u3068\u3053\u3046\u306a\u308b\u3002\uff08\u8a73\u7d30\u306f\u30ea\u30f3\u30af\u5143\u3092\u53c2\u7167\uff09
\nlhs\u3068rhs\u306f\u81ea\u8eab\u304c\u5c5e\u3057\u3066\u3044\u308bstruct Node\u306e\u30dd\u30a4\u30f3\u30bf\u306b\u306a\u3063\u3066\u304a\u308a\u3001\u518d\u5e30\u7684\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u306b\u306a\u308b\u3002<\/p>\n

typedef<\/span> struct<\/span> Node<\/span> Node<\/span>;<\/span>\r\nstruct<\/span> Node<\/span> {<\/span>\r\n  NodeKind<\/span> kind<\/span>;<\/span> \/\/ \u30ce\u30fc\u30c9\u306e\u578b<\/span>\r\n  Node<\/span> *<\/span>lhs<\/span>;<\/span>     \/\/ \u5de6\u8fba<\/span>\r\n  Node<\/span> *<\/span>rhs<\/span>;<\/span>     \/\/ \u53f3\u8fba<\/span>\r\n  int<\/span> val<\/span>;<\/span>       \/\/ kind\u304cND_NUM\u306e\u5834\u5408\u306e\u307f\u4f7f\u3046<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u3092Rust\u3067\u8868\u73fe\u3059\u308b\u3002
\n\u4e00\u65e6\u3053\u3093\u306a\u611f\u3058\u3067\u66f8\u3044\u3066\u307f\u305f\u304c\u3001<\/p>\n
struct<\/span> Node<\/span> {<\/span>\r\n    kind<\/span>:<\/span> NodeKind<\/span>,<\/span>\r\n    lhs<\/span>:<\/span> Node<\/span>,<\/span>\r\n    rhs<\/span>:<\/span> Node<\/span>,<\/span>\r\n    val<\/span>:<\/span> u32<\/span>,<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u306f\u5f53\u7136\u5931\u6557\u3059\u308b\u3002<\/p>\n
error[E0072]: recursive type `Node` has infinite size\r\n --> src\/main.rs:6:1\r\n  |\r\n6 | struct Node {\r\n  | ^^^^^^^^^^^ recursive type has infinite size\r\n7 |     kind: NodeKind,\r\n8 |     lhs: Node,\r\n  |     --------- recursive without indirection\r\n9 |     rhs: Node,\r\n  |     --------- recursive without indirection\r\n<\/code><\/pre>\n
lhs\u3068rhs\u304c\u5b9f\u614b\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u3066\u304a\u308a\u3001\u518d\u5e30\u7684\u306b\u7e70\u308a\u8fd4\u3055\u308c\u305f\u5834\u5408\u306b\u69cb\u9020\u4f53\u306e\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\u304c\u7121\u9650\u306b\u767a\u6563\u3057\u3066\u3057\u307e\u3046\u305f\u3081\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u30a8\u30e9\u30fc\u306b\u3059\u308b\u3002
\n\u3053\u3053\u3092C\u3067\u3044\u3046\u30dd\u30a4\u30f3\u30bf\u3068\u3057\u3066\u5b9a\u7fa9\u3057\u305f\u3044\u8a33\u3060\u304c\u3001Rust\u3067\u306f\u30dd\u30a4\u30f3\u30bf\u306e\u8003\u3048\u65b9\u3068\u3044\u3046\u304b\u3001\u4f7f\u3044\u65b9\u304cC\u3068\u306f\u5927\u304d\u304f\u7570\u306a\u308b\u3002\u751f\u30dd\u30a4\u30f3\u30bf\u3068\u3044\u3046\u3082\u306e\u3082\u3042\u308b\u3089\u3057\u3044\u304c\u3001\u3053\u3053\u3067\u5b89\u6613\u306bunsafe\u306a\u51e6\u7406\u306b\u3082\u3057\u305f\u304f\u306a\u3044\u3002\u5c11\u3057\u8abf\u3079\u305f\u3089\u3001\u3053\u3046\u3044\u3046\u5834\u5408\u306fBox\u3092\u4f7f\u3048\u3070\u3044\u3044\u3089\u3057\u3044\u3068\u5206\u304b\u3063\u305f\u3002<\/p>\n
Box\u3092\u4f7f\u3063\u3066\u66f8\u304d\u5909\u3048\u3066\u307f\u308b\u3002<\/p>\n
struct<\/span> Node<\/span> {<\/span>\r\n    kind<\/span>:<\/span> NodeKind<\/span>,<\/span>\r\n    lhs<\/span>:<\/span> Box<\/span><<\/span>Node<\/span>><\/span>,<\/span>\r\n    rhs<\/span>:<\/span> Box<\/span><<\/span>Node<\/span>><\/span>,<\/span>\r\n    val<\/span>:<\/span> u32<\/span>,<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u3067cargo check\u3059\u308b\u3068\u30b3\u30f3\u30d1\u30a4\u30eb\u306f\u554f\u984c\u306a\u304f\u901a\u308b\u3002
\n\u3057\u304b\u3057\u3001\u4ee5\u4e0b\u3067\u8aac\u660e\u3059\u308b\u304c\u3001\u3053\u308c\u306f\u7f60\u3067\u3042\u308b\u3002<\/p>\n
\u69cb\u9020\u4f53\u3092\u4f7f\u3063\u3066\u307f\u308b<\/h2>\n
\u307e\u305a\u3001C\u306e\u4e16\u754c\u3067\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u4f7f\u7528\u3059\u308b\u95a2\u6570\u3092\u898b\u3066\u307f\u308b\u3002<\/p>\n
Node<\/span> *<\/span>new_node<\/span>(<\/span>NodeKind<\/span> kind<\/span>,<\/span> Node<\/span> *<\/span>lhs<\/span>,<\/span> Node<\/span> *<\/span>rhs<\/span>)<\/span> {<\/span>\r\n  Node<\/span> *<\/span>node<\/span> =<\/span> calloc<\/span>(<\/span>1<\/span>,<\/span> sizeof<\/span>(<\/span>Node<\/span>));<\/span>\r\n  node<\/span>-><\/span>kind<\/span> =<\/span> kind<\/span>;<\/span>\r\n  node<\/span>-><\/span>lhs<\/span> =<\/span> lhs<\/span>;<\/span>\r\n  node<\/span>-><\/span>rhs<\/span> =<\/span> rhs<\/span>;<\/span>\r\n  return<\/span> node<\/span>;<\/span>\r\n}<\/span>\r\n\r\nNode<\/span> *<\/span>new_node_num<\/span>(<\/span>int<\/span> val<\/span>)<\/span> {<\/span>\r\n  Node<\/span> *<\/span>node<\/span> =<\/span> calloc<\/span>(<\/span>1<\/span>,<\/span> sizeof<\/span>(<\/span>Node<\/span>));<\/span>\r\n  node<\/span>-><\/span>kind<\/span> =<\/span> ND_NUM<\/span>;<\/span>\r\n  node<\/span>-><\/span>val<\/span> =<\/span> val<\/span>;<\/span>\r\n  return<\/span> node<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u3092Rust\u3067\u5b9f\u88c5\u3057\u3066\u307f\u308b\u3002<\/p>\n
fn<\/span> new_node<\/span>(<\/span>kind<\/span>:<\/span> NodeKind<\/span>,<\/span> lhs<\/span>:<\/span> Box<\/span><<\/span>Node<\/span>><\/span>,<\/span> rhs<\/span>:<\/span> Box<\/span><<\/span>Node<\/span>><\/span>)<\/span> -><\/span> Box<\/span><<\/span>Node<\/span>><\/span> {<\/span>\r\n    let<\/span> node<\/span> =<\/span> Node<\/span> {<\/span>\r\n        kind<\/span>:<\/span> kind<\/span>,<\/span>\r\n        lhs<\/span>:<\/span> lhs<\/span>,<\/span>\r\n        rhs<\/span>:<\/span> rhs<\/span>,<\/span>\r\n    };<\/span>\r\n    let<\/span> node<\/span> =<\/span> Box<\/span>::<\/span>new<\/span>(<\/span>node<\/span>);<\/span>\r\n    node<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> new_node_num<\/span>(<\/span>val<\/span>:<\/span> u32<\/span>)<\/span> -><\/span> Box<\/span><<\/span>Node<\/span>><\/span> {<\/span>\r\n    let<\/span> node<\/span> =<\/span> Node<\/span> {<\/span>\r\n        kind<\/span>:<\/span> NodeNum<\/span>,<\/span>\r\n        val<\/span>:<\/span> val<\/span>,<\/span>\r\n    };<\/span>\r\n    let<\/span> node<\/span> =<\/span> Box<\/span>::<\/span>new<\/span>(<\/span>node<\/span>);<\/span>\r\n    node<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3057\u304b\u3057\u3001\u3053\u308c\u3092cargo check\u3059\u308b\u3068\u30a8\u30e9\u30fc\u306b\u306a\u308b\u3002<\/p>\n
error[E0063]: missing field `val` in initializer of `Node`\r\n  --> src\/main.rs:17:16\r\n   |\r\n17 |     let node = Node {\r\n   |                ^^^^ missing `val`\r\n\r\nerror[E0063]: missing fields `lhs`, `rhs` in initializer of `Node`\r\n  --> src\/main.rs:27:16\r\n   |\r\n27 |     let node = Node {\r\n   |                ^^^^ missing `lhs`, `rhs`\r\n\r\n<\/code><\/pre>\n
Rust\u3067\u306f\u69cb\u9020\u4f53\u3092\u4f7f\u3046\u3068\u304d\u3001\u5168\u3066\u306e\u30e1\u30f3\u30d0\u3092\u521d\u671f\u5316\u3057\u306a\u304f\u3066\u306f\u306a\u3089\u306a\u3044\u3002<\/p>\n
\u3093\uff1fBox\u306e\u521d\u671f\u5024\uff1f
\nu32\u3067\u3042\u308bval\u306e\u521d\u671f\u5024\u306f\u3001\u9069\u5f53\u306b0\u3068\u304b\u306b\u8a2d\u5b9a\u3067\u304d\u306a\u304f\u3082\u306a\u3044\u304c\u3001Box\u306e\u521d\u671f\u5024\u304c\u8a2d\u5b9a\u3067\u304d\u306a\u3044\u3002\u30c0\u30df\u30fc\u306eBox\u3092\u7528\u610f\u3057\u3066\u305d\u306e\u5024\u3092\u5165\u308c\u3088\u3046\u3068\u3057\u3066\u3082\u3001\u305d\u306e\u30c0\u30df\u30fc\u306e\u4e2d\u306eBox\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u307e\u305f\u5225\u306eBox\u304c\u3001\u3068\u3044\u3046\u3088\u3046\u306b\u518d\u5e30\u3057\u3066\u3044\u308b\u306e\u3067\u8a70\u3093\u3067\u3057\u307e\u3046\u3002<\/p>\n
\u3067\u306f\u3001\u3069\u3046\u3059\u308b\uff1f<\/h2>\n
\u3053\u3053\u3067\u3001\u4eca\u56de\u306e\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u6574\u7406\u3057\u3066\u307f\u308b\u3002\u518d\u5e30\u7684\u30c7\u30fc\u30bf\u69cb\u9020\u306b\u306f2\u7a2e\u985e\u306e\u30c7\u30fc\u30bf\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u3002<\/p>\n
    \n
  • \n
      \u518d\u5e30\u3059\u308b\u30c7\u30fc\u30bf\uff08\u6b21\u306b\u3064\u306a\u304c\u308b\u30c7\u30fc\u30bf\uff09<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \u7d42\u7aef\u3059\u308b\u30c7\u30fc\u30bf\uff08\u6b21\u304c\u306a\u3044\u30c7\u30fc\u30bf\uff09<\/ul>\n
        \u3053\u3053\u307e\u3067\u306b\u66f8\u3044\u305f\u69cb\u9020\u4f53\u3067\u306f\u3001\u3053\u306e2\u7a2e\u985e\u306e\u30c7\u30fc\u30bf\u304c1\u3064\u306e\u69cb\u9020\u4f53\u306b\u6df7\u5728\u3057\u3066\u3057\u307e\u3063\u3066\u3044\u308b\u3053\u3068\u306b\u306a\u308b\u3002
        \nC\u3067\u306f\u3053\u306e\u3088\u3046\u306a\u69cb\u9020\u4f53\u3092\u5b9a\u7fa9\u3067\u304d\u308b\u304c\u3001\u7d50\u679c\u3068\u3057\u3066\u305d\u308c\u305e\u308c\u306e\u30c7\u30fc\u30bf\u3092\u8868\u73fe\u3059\u308b\u969b\u306b\u521d\u671f\u5316\u3055\u308c\u306a\u3044\uff08\u610f\u5473\u306e\u3042\u308b\u5024\u304c\u5165\u3089\u306a\u3044\uff09\u9818\u57df\u304c\u3067\u304d\u3066\u3057\u307e\u3046\u3002\u3053\u308c\u3067\u306f\u3001\u610f\u5473\u306e\u306a\u3044\u5024\u306b\u4e0d\u6b63\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3066\u3057\u307e\u3046\u5371\u967a\u304c\u751f\u3058\u308b\u3068\u3053\u308d\u3001Rust\u3067\u306f\u305d\u306e\u3088\u3046\u306a\u5371\u967a\u6027\u3092\u6392\u9664\u3067\u304d\u3066\u3044\u308b\u3001\u3068\u8a00\u3048\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u3002<\/p>\n
        \u3067\u306f\u3001\u3069\u3046\u3059\u308b\u304b\uff1f
        \nRust\u3067\u306f\u3001\u3053\u3046\u3044\u3046\u3068\u304d\u306b\u306fenum\u3092\u4f7f\u3046\u3068\u3046\u307e\u304f\u8868\u73fe\u3067\u304d\u308b\u3002Rust\u306eenum\u306fC\u306b\u6bd4\u3079\u3066\u591a\u69d8\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u8868\u73fe\u3067\u304d\u308b\u3002
        \n\u3053\u3053\u3067\u306f\u3001\u518d\u5e30\u3059\u308b\u30c7\u30fc\u30bf\u306f2\u9805\u6f14\u7b97\u5b50\u3001\u7d42\u7aef\u3059\u308b\u30c7\u30fc\u30bf\u306f\u6570\u5b57\u3068\u306a\u308b\u305f\u3081\u3001\u305d\u308c\u305e\u308c\u306e\u30c7\u30fc\u30bf\u306b\u5fc5\u8981\u306a\u60c5\u5831\u3092\u8003\u3048enum\u3092\u7528\u3044\u3066\u5b9a\u7fa9\u3059\u308b\u3002<\/p>\n
        enum<\/span> Node<\/span> {<\/span>\r\n    Operator<\/span> {<\/span>\r\n        kind<\/span>:<\/span> NodeKind<\/span>,<\/span>\r\n        lhs<\/span>:<\/span> Box<\/span><<\/span>Node<\/span>><\/span>,<\/span>\r\n        rhs<\/span>:<\/span> Box<\/span><<\/span>Node<\/span>><\/span>,<\/span>\r\n    },<\/span>  \r\n    Number<\/span> {<\/span>\r\n        val<\/span>:<\/span> u32<\/span>,<\/span>\r\n    },<\/span>  \r\n}<\/span>\r\n<\/code><\/pre>\n
        \u64cd\u4f5c\u95a2\u6570\u3082\u5b9a\u7fa9\u3059\u308b\u3002<\/p>\n
        fn<\/span> new_node<\/span>(<\/span>kind<\/span>:<\/span> NodeKind<\/span>,<\/span> lhs<\/span>:<\/span> Box<\/span><<\/span>Node<\/span>><\/span>,<\/span> rhs<\/span>:<\/span> Box<\/span><<\/span>Node<\/span>><\/span>)<\/span> -><\/span> Box<\/span><<\/span>Node<\/span>><\/span> {<\/span>\r\n    let<\/span> node<\/span> =<\/span> Node<\/span>::<\/span>Operator<\/span> {<\/span>\r\n        kind<\/span>:<\/span> kind<\/span>,<\/span>\r\n        lhs<\/span>:<\/span> lhs<\/span>,<\/span>\r\n        rhs<\/span>:<\/span> rhs<\/span>,<\/span>\r\n    };<\/span>\r\n    let<\/span> node<\/span> =<\/span> Box<\/span>::<\/span>new<\/span>(<\/span>node<\/span>);<\/span>\r\n    node<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> new_node_num<\/span>(<\/span>val<\/span>:<\/span> u32<\/span>)<\/span> -><\/span> Box<\/span><<\/span>Node<\/span>><\/span> {<\/span>\r\n    let<\/span> node<\/span> =<\/span> Node<\/span>::<\/span>Number<\/span> {<\/span>\r\n        val<\/span>:<\/span> val<\/span>,<\/span>\r\n    };<\/span>\r\n    let<\/span> node<\/span> =<\/span> Box<\/span>::<\/span>new<\/span>(<\/span>node<\/span>);<\/span>\r\n    node<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        \u3053\u308c\u3067cargo check\u3082\u901a\u308a\u3001\u518d\u5e30\u7684\u30c7\u30fc\u30bf\u69cb\u9020\u306b\u5fc5\u8981\u306a2\u7a2e\u985e\u306e\u30c7\u30fc\u30bf\u3082\u660e\u78ba\u306b\u5206\u96e2\u3055\u305b\u3066\u5b9a\u7fa9\u3067\u304d\u305f\u3002<\/p>\n
        \u307e\u3068\u3081<\/h1>\n
        Rust\u3067\u518d\u5e30\u7684\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u5b9a\u7fa9\u3059\u308b\u3068\u304d\u306fenum\u3092\u4f7f\u304a\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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