{"id":45358,"date":"2023-11-03T01:37:53","date_gmt":"2023-04-22T11:50:29","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45358-2\/"},"modified":"2024-05-04T07:15:21","modified_gmt":"2024-05-03T23:15:21","slug":"45358-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45358-2\/","title":{"rendered":""},"content":{"rendered":"<p>\u3042\u3048\u3066\u8a00\u304a\u3046\u3002Rust\u304c\u5927\u597d\u304d\u3067\u3042\u308b\u3068\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u306fRust 2 Advent Calendar 2020 \u306e8\u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3059\u3002<br \/>\n\u8fd1\u5e74\u3001Rust\u306e\u4eba\u6c17\u304c\u4e0a\u304c\u3063\u3066\u304d\u3066\u3044\u308b\u3088\u3046\u3067\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u3067\u3082\u3001\u300cRust \u597d\u304d\u300d\u7b49\u3067\u691c\u7d22\u3059\u308b\u3068\u3055\u307e\u3056\u307e\u306a\u8a18\u4e8b\u304c\u898b\u3064\u304b\u308b\u53cd\u9762\u3001\u9006\u306b\u300cRust \u5acc\u3044\u300d\u3068\u3044\u3046\u30ef\u30fc\u30c9\u3067\u51fa\u308b\u8a18\u4e8b\u304c\u5c11\u306a\u3044\u306e\u304c\u4e0d\u516c\u5e73\u306a\u6c17\u3082\u3059\u308b\u306e\u3067\u3001\u3042\u3048\u3066Rust\u306e\u826f\u304f\u306a\u3044\u306a\u3068\u601d\u3046\u70b9\u3092\u6319\u3052\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n<h1>\u975e\u540c\u671f\u51e6\u7406\u306b\u3064\u3044\u3066<\/h1>\n<p>Rust\u306b\u306f\u30d3\u30eb\u30c8\u30a4\u30f3\u306e\u975e\u540c\u671f\u51e6\u7406\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u5927\u304d\u304f\u5206\u3051\u30662\u3064\u306e\u8981\u7d20\u304b\u3089\u6210\u308a\u7acb\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>Future\u30c8\u30ec\u30a4\u30c8<br \/>\n\u30e9\u30f3\u30bf\u30a4\u30e0<\/p>\n<p>\u8a73\u3057\u304f\u306f\u4ed6\u306e\u8a18\u4e8b\u3092\u53c2\u7167\u3057\u3066\u3044\u305f\u3060\u304d\u305f\u3044\u306e\u3067\u3059\u304c\u3001\u3042\u307e\u308a\u6b63\u78ba\u3067\u306a\u3044\u8aac\u660e\u3092\u3059\u308b\u3068\u30011. \u306eFuture\u30af\u30ec\u30a4\u30c8\u306f\u975e\u540c\u671f\u51e6\u7406\u81ea\u4f53\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306e\u30c8\u30ec\u30a4\u30c8\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001Rust\u306e\u7d44\u307f\u8fbc\u307f\u30ad\u30fc\u30ef\u30fc\u30c9async\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u95a2\u6570<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">async<\/span> <span class=\"k\">fn<\/span> <span class=\"nf\">func<\/span><span class=\"p\">()<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"nb\">Result<\/span><span class=\"o\">&lt;<\/span><span class=\"p\">(),<\/span> <span class=\"n\">Error<\/span><span class=\"o\">&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"cm\">\/* snip *\/<\/span> <span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u306f\u3001<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">fn<\/span> <span class=\"nf\">func<\/span><span class=\"p\">()<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"k\">impl<\/span> <span class=\"n\">Future<\/span><span class=\"o\">&lt;<\/span><span class=\"n\">Output<\/span> <span class=\"o\">=<\/span> <span class=\"nb\">Result<\/span><span class=\"o\">&lt;<\/span><span class=\"p\">(),<\/span> <span class=\"n\">Error<\/span><span class=\"o\">&gt;&gt;<\/span> <span class=\"p\">{<\/span> <span class=\"cm\">\/* snip *\/<\/span> <span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u3088\u3046\u306a\u611f\u3058\u306b\u5909\u63db\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u6642Future\u30c8\u30ec\u30a4\u30c8\u304c\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u3053\u3053\u3067func()\u3092<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">let<\/span> <span class=\"n\">_<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">func<\/span><span class=\"p\">();<\/span>\r\n<\/code><\/pre>\n<p>\u3068\u3057\u3066\u3082\u3001func()\u306e\u4e2d\u8eab\u306f\u5b9f\u884c\u3055\u308c\u307e\u305b\u3093\u3002Future\u30c8\u30ec\u30a4\u30c8\u3092\u5b9f\u88c5\u3057\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u751f\u6210\u3055\u308c\u308b\u3060\u3051\u3067\u3059\u3002<br \/>\n\u5b9f\u969b\u306bFuture\u306e\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081\u306b\u306f\u30012. \u306e\u30e9\u30f3\u30bf\u30a4\u30e0\u304c\u5fc5\u8981\u3067\u3042\u308a\u3001\u3053\u308c\u306fFuture\u30c8\u30ec\u30a4\u30c8\u3068\u9055\u3063\u3066Rust\u306e\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u306f\u542b\u307e\u308c\u307e\u305b\u3093\u3002<br \/>\n\u3088\u3063\u3066\u3001\u30e9\u30f3\u30bf\u30a4\u30e0\u3092\u5b9f\u88c5\u3057\u305f\u5916\u90e8\u30c8\u30ec\u30a4\u30c8\u306b\u4f9d\u5b58\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u73fe\u5728\u3001Rust\u3067\u5e83\u304f\u4f7f\u308f\u308c\u3066\u3044\u308b\u30e9\u30f3\u30bf\u30a4\u30e0\u306b\u306f(\u79c1\u304c\u77e5\u3063\u3066\u3044\u308b\u9650\u308a)\u4ee5\u4e0b\u306e\u3082\u306e\u304c\u3042\u308a\u307e\u30591\u3002<\/p>\n<p>tokio 0.2\u7cfb<\/p>\n<p>tokio 0.3\u7cfb<\/p>\n<p>tokio 1.0\u7cfb (\u2190\u8ffd\u52a0)<br \/>\nfutures<\/p>\n<p>\u4f8b\u3048\u3070\u3001tokio 0.2\u7cfb\u3067\u4f5c\u3089\u308c\u305fFuture\u3092tokio 0.3\u7cfb\u3084futures\u306e\u30e9\u30f3\u30bf\u30a4\u30e0\u3067\u5b9f\u884c\u3059\u308b\u3053\u3068\u306f\u57fa\u672c\u7684\u306b\u3067\u304d\u307e\u305b\u3093\u3002<br \/>\n\u3053\u308c\u304c\u7279\u306b\u554f\u984c\u3068\u306a\u308b\u306e\u306fasync fn\u3092\u542b\u3080\u5916\u90e8\u30af\u30ec\u30fc\u30c8\u3092\u5229\u7528\u3059\u308b\u5834\u5408\u3067\u3001\u305d\u306e\u5916\u90e8\u30af\u30ec\u30fc\u30c8\u304c\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u30e9\u30f3\u30bf\u30a4\u30e0\u304c\u3069\u308c\u304b\u3092\u5229\u7528\u8005\u304c\u6ce8\u610f\u6df1\u304f\u8abf\u3079\u3066\u304a\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002tokio 0.3\u7cfb\u306e\u30e9\u30f3\u30bf\u30a4\u30e0\u3092\u4f7f\u7528\u3057\u305f\u304f\u3066\u3082\u3001\u4f9d\u5b58\u3059\u308b\u30af\u30ec\u30fc\u30c8\u304ctokio 0.2\u7cfb\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u30010.3\u7cfb\u3092\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>\u73fe\u5728\u306f\u79fb\u884c\u671f\u3067\u3042\u308a\u3001\u4eca\u5f8ctokio 0.3\u7cfb\u306b\u5bfe\u5fdc\u3059\u308b\u30af\u30ec\u30fc\u30c8\u304c\u5897\u3048\u3066\u304f\u308b\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u5b8c\u5168\u306b\u79fb\u884c\u3057\u5207\u308b\u307e\u3067\u306f\u3001\u30af\u30ec\u30fc\u30c8\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u6642\u306b\u52d5\u3067features\u3092\u6307\u5b9a\u3059\u308b\u7b49\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<h1>\u4f7f\u3048\u308b\u30c8\u30ec\u30a4\u30c8\u304c\u591a\u304f\u3066\u6df7\u4e71\u3059\u308b<\/h1>\n<p>\u30c8\u30ec\u30a4\u30c8\u306f\u3001Rust\u306e\u3059\u3070\u3089\u3057\u3044\u6a5f\u80fd\u306e\u4e00\u3064\u3067\u3059\u3002\u9006\u306b\u3001Rust\u306e\u6a5f\u80fd\u306e\u591a\u304f\u306f\u30c8\u30ec\u30a4\u30c8\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u30c8\u30ec\u30a4\u30c8\u3092\u4f7f\u3044\u3053\u306a\u305b\u306a\u3051\u308c\u3070Rust\u3092\u4fbf\u5229\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u306f\u96e3\u3057\u3044\u3067\u3057\u3087\u3046\u3002<br \/>\n\u3057\u304b\u3057\u3001\u30c8\u30ec\u30a4\u30c8\u306b\u306f\u591a\u304f\u306e\u7a2e\u985e\u304c\u3042\u308b\u305f\u3081\u3001\u30c8\u30ec\u30a4\u30c8\u306e\u5168\u8c8c\u3092\u77e5\u308b\u306e\u306f\u7c21\u5358\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u7279\u306b\u3001\u4f3c\u305f\u3088\u3046\u306a\u6a5f\u80fd\u304c\u8907\u6570\u306e\u30c8\u30ec\u30a4\u30c8\u3067\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u304c\u3042\u308a\u3001\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u8aad\u3093\u3067\u3082\u3069\u3046\u4f7f\u3044\u5206\u3051\u308c\u3070\u3044\u3044\u304b\u7406\u89e3\u3067\u304d\u306a\u3044\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u30c8\u30ec\u30a4\u30c8\u306f\u3059\u3079\u3066\u300c\u578b\u306e\u5909\u63db\u300d\u306b\u4fc2\u308b\u30c8\u30ec\u30a4\u30c8\u3067\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">From<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Borrow<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">AsRef<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">ToOwned<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Deref<\/ul>\n<p>\u3053\u306e\u4e2d\u3067\u3001Deref\u306f\u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u306b\u5bfe\u3057\u3066\u6f14\u7b97\u5b50*\u3092\u9069\u7528\u3057\u305f\u3068\u304d\u306e\u52d5\u4f5c\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u30c8\u30ec\u30a4\u30c8\u3067\u3042\u308a\u3001\u4f7f\u7528\u306b\u306f\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<br \/>\nBorrow\u3068AsRef\u306b\u3064\u3044\u3066\u306f\u4ee5\u4e0b\u3092\u53c2\u7167\u3002<\/p>\n<p>Borrow and AsRef<\/p>\n<h1>\u95a2\u6570\u306e\u5f15\u6570\u3068\u6240\u6709\u6a29<\/h1>\n<p>\u60c5\u5831\u63d0\u4f9b: @Iwancof_ptr\u3055\u3093<\/p>\n<p>\u4f8b\u3048\u3070\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u306f\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002\u306a\u305c\u3067\u3057\u3087\u3046\u304b?<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">struct<\/span> <span class=\"n\">S<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">impl<\/span> <span class=\"n\">S<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"k\">pub<\/span> <span class=\"k\">fn<\/span> <span class=\"nf\">outer_ref<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">self<\/span><span class=\"p\">,<\/span> <span class=\"n\">_<\/span><span class=\"p\">:<\/span> <span class=\"nb\">i32<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n\t<span class=\"k\">pub<\/span> <span class=\"k\">fn<\/span> <span class=\"nf\">outer_mut<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">mut<\/span> <span class=\"k\">self<\/span><span class=\"p\">,<\/span> <span class=\"n\">_<\/span><span class=\"p\">:<\/span> <span class=\"nb\">i32<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n\t<span class=\"k\">pub<\/span> <span class=\"k\">fn<\/span> <span class=\"nf\">inner_ref<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">self<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"nb\">i32<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"mi\">10<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n\t<span class=\"k\">pub<\/span> <span class=\"k\">fn<\/span> <span class=\"nf\">inner_mut<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">mut<\/span> <span class=\"k\">self<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"nb\">i32<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"mi\">10<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n\t\r\n<span class=\"p\">}<\/span>\r\n \r\n<span class=\"k\">fn<\/span> <span class=\"nf\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"k\">let<\/span> <span class=\"k\">mut<\/span> <span class=\"n\">s<\/span> <span class=\"o\">=<\/span> <span class=\"n\">S<\/span><span class=\"p\">;<\/span>\r\n\t<span class=\"n\">s<\/span><span class=\"nf\">.outer_ref<\/span><span class=\"p\">(<\/span><span class=\"n\">s<\/span><span class=\"nf\">.inner_mut<\/span><span class=\"p\">());<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u3053\u3053\u3067\u3001outer_ref()\u547c\u3073\u51fa\u3057\u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5c55\u958b\u3057\u3066\u307f\u308b\u3092\u308f\u304b\u308a\u3084\u3059\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nn\">S<\/span><span class=\"p\">::<\/span><span class=\"nf\">outer_ref<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"n\">s<\/span><span class=\"p\">,<\/span> <span class=\"nn\">S<\/span><span class=\"p\">::<\/span><span class=\"nf\">inner_mut<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">mut<\/span> <span class=\"n\">s<\/span><span class=\"p\">));<\/span>\r\n<\/code><\/pre>\n<p>\u3053\u308c\u3092\u66f4\u306b\u5206\u89e3\u3059\u308b\u3068\u3053\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5909\u6570s\u306e\u53c2\u7167&amp;s\u3092\u53d6\u5f97\u3059\u308b\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5909\u6570s\u306e\u53c2\u7167&amp;mut s\u3092\u53d6\u5f97\u3059\u308b\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&amp;mut s\u3092\u5f15\u6570\u3068\u3057\u3066S::inner_mut()\u3092\u547c\u3073\u51fa\u3057\u502410\u3092\u5f97\u308b\u3002<\/p>\n<p>&amp;s\u53ca\u307310\u3092\u5f15\u6570\u3068\u3057\u3066S::outer_ref()\u3092\u547c\u3073\u51fa\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u30012. \u304b\u30893. \u307e\u3067\u306e\u9593\u3001\u5909\u6570s\u306b\u5bfe\u3059\u308b\u53c2\u7167&amp;s\u53ca\u3073&amp;mut s\u304c\u5171\u5b58\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u304c\u30a8\u30e9\u30fc\u306e\u539f\u56e0\u3060\u3068\u601d\u308f\u308c\u307e\u3059\u3002<br \/>\n\u3088\u3063\u3066\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u66f8\u3051\u3070\u30a8\u30e9\u30fc\u306f\u7121\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">fn<\/span> <span class=\"nf\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"k\">let<\/span> <span class=\"k\">mut<\/span> <span class=\"n\">s<\/span> <span class=\"o\">=<\/span> <span class=\"n\">S<\/span><span class=\"p\">;<\/span>\r\n\t<span class=\"k\">let<\/span> <span class=\"n\">i<\/span> <span class=\"o\">=<\/span> <span class=\"n\">s<\/span><span class=\"nf\">.inner_mut<\/span><span class=\"p\">();<\/span>\r\n\t<span class=\"n\">s<\/span><span class=\"nf\">.outer_ref<\/span><span class=\"p\">(<\/span><span class=\"n\">i<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u307e\u305f\u3001\u8a66\u3057\u305f\u3068\u3053\u308ds.outer_mut(s.inner_ref())\u306f\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u539f\u56e0\u304c\u308f\u304b\u308b\u65b9\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002(\u8ffd\u8a18: Two-phase borrow\u306b\u3088\u308b\u3082\u306e\u3068\u306e\u4e8b\u3067\u3059\u3002)<\/p>\n<blockquote><p>https:\/\/t.co\/rvZq7Mj6T0\u3053\u3093\u306a\u611f\u3058\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u3046\u30fc\u3093\u3002\u3069\u3061\u3089\u304b\u3092 mut \u306b\u3059\u308b\u3068\u501f\u7528\u3067\u304d\u306a\u3044\u3063\u307d\u3044\u3067\u3059\u306d\u3002\u2014 \u3044\u308f\u3093\u3053 (@Iwancof_ptr) November 21, 2020<\/p><\/blockquote>\n<p><script><\/script><\/p>\n<h1>(\u8ffd\u52a0) \u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u69cb\u6587\u306eaudo-dereference\u306b\u3064\u3044\u3066<\/h1>\n<p>\u53c2\u8003<\/p>\n<p>Rust\u3067\u306f\u3001\u578bX\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8x\u306b\u5bfe\u3057\u3066\u30e1\u30bd\u30c3\u30c9m\u3092\u547c\u3073\u51fa\u3059\u969b\u306b\u3001X::m(x)\u3082\u3057\u304f\u306fx.m()\u3068\u3044\u3046\u69cb\u6587\u3092\u7528\u3044\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u5f8c\u8005\u306e\u5834\u5408\u3001\u81ea\u52d5Deref\u6a5f\u80fd\u304c\u50cd\u304d\u3001\u4ee5\u4e0b\u306e\u4f8b\u306e\u3088\u3046\u306b\u672c\u6765(&amp;x).m()\u3084(*x).m()\u3068\u66f8\u304f\u3079\u304d\u3068\u3053\u308d\u3067*\u3084&amp;\u3092\u7701\u7565\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ ---- &amp; \u306e\u4f8b ----<\/span>\r\n<span class=\"k\">struct<\/span> <span class=\"n\">X<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">impl<\/span> <span class=\"n\">X<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">m<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">self<\/span><span class=\"p\">)<\/span> <span class=\"p\">{}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"n\">X<\/span><span class=\"p\">;<\/span>\r\n<span class=\"nn\">X<\/span><span class=\"p\">::<\/span><span class=\"nf\">m<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"n\">x<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"n\">x<\/span><span class=\"p\">)<\/span><span class=\"nf\">.m<\/span><span class=\"p\">();<\/span> <span class=\"c1\">\/\/ \u4e0a\u306b\u540c\u3058<\/span>\r\n<span class=\"c1\">\/\/ \u3053\u3053\u3067&amp;\u306f\u4e0b\u306e\u3088\u3046\u306b\u7701\u7565\u3067\u304d\u308b<\/span>\r\n<span class=\"n\">X<\/span><span class=\"nf\">.m<\/span><span class=\"p\">();<\/span>\r\n<span class=\"c1\">\/\/ ---- * \u306e\u4f8b ----<\/span>\r\n<span class=\"k\">let<\/span> <span class=\"n\">y<\/span> <span class=\"o\">=<\/span> <span class=\"nn\">Box<\/span><span class=\"p\">::<\/span><span class=\"nf\">new<\/span><span class=\"p\">(<\/span><span class=\"mf\">1.5f64<\/span><span class=\"p\">);<\/span>\r\n<span class=\"nd\">println!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"{}\"<\/span><span class=\"p\">,<\/span> <span class=\"nn\">f64<\/span><span class=\"p\">::<\/span><span class=\"nf\">ceil<\/span><span class=\"p\">(<\/span><span class=\"o\">*<\/span><span class=\"n\">y<\/span><span class=\"p\">));<\/span>\r\n<span class=\"nd\">println!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"{}\"<\/span><span class=\"p\">,<\/span> <span class=\"p\">(<\/span><span class=\"o\">*<\/span><span class=\"n\">y<\/span><span class=\"p\">)<\/span><span class=\"nf\">.ceil<\/span><span class=\"p\">());<\/span> <span class=\"c1\">\/\/ \u4e0a\u306b\u540c\u3058<\/span>\r\n<span class=\"c1\">\/\/ \u3053\u3053\u3067*\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u7701\u7565\u3067\u304d\u308b<\/span>\r\n<span class=\"nd\">println!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"{}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">y<\/span><span class=\"nf\">.ceil<\/span><span class=\"p\">());<\/span>\r\n<\/code><\/pre>\n<p>\u3053\u308c\u306f\u4fbf\u5229\u306a\u6a5f\u80fd\u3067\u3059\u304c\u3001\u6642\u6298\u4e92\u63db\u6027\u306e\u554f\u984c\u3092\u8d77\u3053\u3059\u3068\u3044\u3046\u554f\u984c\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001IntoIterator\u3068\u3044\u3046\u30c8\u30ec\u30a4\u30c8\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u3001vec![1,2,3].into_iter()\u306e\u3088\u3046\u306binto_iter()\u3068\u3044\u3046\u95a2\u6570\u3092\u63d0\u4f9b\u3057\u3066\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306e\u30c8\u30ec\u30a4\u30c8\u3067\u3059\u3002\u3053\u308c\u3092\u914d\u5217[T; N]\u306b\u5b9f\u88c5\u3057\u3088\u3046\u3068\u3044\u3046\u8b70\u8ad6\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>Add IntoIterator impl for arrays by value (for [T; N])<\/p>\n<p>\u3057\u304b\u3057\u3001\u3053\u3053\u3067\u554f\u984c\u306a\u306e\u306f\u3001\u3059\u3067\u306b&amp;[T; N]\u306b\u5bfe\u3057\u3066IntoIterator()\u304c\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u70b9\u3067\u3059\u3002\u3059\u306a\u308f\u3061\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u306f\u73fe\u6642\u70b9\u3067\u3082\u5408\u6cd52\u3067\u3001&lt;&amp;[i32; 3] as IntoIterator&gt;::into_iter(&amp;arr)\u304c\u3088\u3070\u308c\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30eb\u30fc\u30d7\u5185\u3067\u4f7f\u3048\u308b\u5909\u6570i\u306f&amp;i32\u578b\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">let<\/span> <span class=\"n\">arr<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"mi\">2<\/span><span class=\"p\">,<\/span> <span class=\"mi\">3i32<\/span><span class=\"p\">];<\/span>\r\n<span class=\"k\">for<\/span> <span class=\"n\">i<\/span> <span class=\"k\">in<\/span> <span class=\"n\">arr<\/span><span class=\"nf\">.into_iter<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nd\">println!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"{}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">i<\/span><span class=\"p\">);<\/span>  <span class=\"c1\">\/\/ i \u306f &amp;i32<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u4e00\u65b9\u3001[T; N]\u306b\u5bfe\u3057\u3066IntoIterator\u3092\u5b9f\u88c5\u3059\u308b\u3068\u3001\u4e0a\u306e\u30b3\u30fc\u30c9\u3067\u306f\u4ee3\u308f\u308a\u306b&lt;[i32; 3] as IntoIterator&gt;::into_iter(arr)\u304c\u547c\u3070\u308c\u308b\u3053\u3068\u306b\u306a\u308a\u3001\u5909\u6570i\u306e\u578b\u306fi32\u3068\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u660e\u3089\u304b\u306b\u4e92\u63db\u6027\u3092\u4fb5\u5bb3\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u5b9f\u969b\u3001\u4e0a\u8a18\u30b3\u30fc\u30c9\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u8b66\u544a\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>  |\r\n3 |     for i in arr.into_iter() {\r\n  |                  ^^^^^^^^^ help: use `.iter()` instead of `.into_iter()` to avoid ambiguity: `iter`\r\n  |\r\n  = note: `#[warn(array_into_iter)]` on by default\r\n  = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!\r\n  = note: for more information, see issue #66145 &lt;https:\/\/github.com\/rust-lang\/rust\/issues\/66145&gt;\r\n<\/code><\/pre>\n<p>\u73fe\u72b6\u306e\u6700\u65b0\u306e\u30a8\u30c7\u30a3\u30b7\u30e7\u30f3\u306fedition=2018\u3067\u3059\u304c\u3001\u8fd1\u3044\u5c06\u6765\u306e\u30a8\u30c7\u30a3\u30b7\u30e7\u30f3\u3067\u306f\u89e3\u6d88\u3055\u308c\u308b\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<blockquote><p>#rustlang [T; N] \u306b IntoIterator&lt;Item=T&gt;\u3092\u5b9f\u88c5\u3057\u3066\u307b\u3057\u3044\u3002&amp;[T; N]\u306b\u5bfe\u3059\u308bIntoIter&lt;Item=&amp;T&gt;\u306f\u3059\u3067\u306b\u5b9f\u88c5\u3055\u308c\u3066\u308b\u3051\u3069\u3002\u2014 yasuo_ozu@FizzBuzz\u3080\u305a\u3044 (@yasuo_ozu) December 28, 2020<\/p><\/blockquote>\n<p><script><\/script><\/p>\n<section>async-std\u306f\u73fe\u5728futures\u3092\u90e8\u7684\u306b\u4f7f\u3063\u3066\u3044\u308b\u306e\u3068\u601d\u308f\u308c\u307e\u3059\u3002\u307e\u305factix-rt\u306ftokio\u3092\u4f7f\u3063\u3066\u3044\u308b\u3082\u306e\u3068\u601d\u308f\u308c\u307e\u3059\u3002 \u21a9<\/p>\n<p>&amp;[T]\u306b\u3082IntoIterator\u304c\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u3053\u308c\u306b\u5408\u308f\u305b\u3066&amp;[T; N]\u306b\u3082\u5b9f\u88c5\u3057\u3066\u3044\u308b\u306e\u3060\u3068\u601d\u3044\u307e\u3059 \u21a9<\/p>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>\u3042\u3048\u3066\u8a00\u304a\u3046\u3002Rust\u304c\u5927\u597d\u304d\u3067\u3042\u308b\u3068\u3002 \u3053\u306e\u8a18\u4e8b\u306fRust 2 Advent Calendar 2020 \u306e [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45358","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>- 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\/45358-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"\u3042\u3048\u3066\u8a00\u304a\u3046\u3002Rust\u304c\u5927\u597d\u304d\u3067\u3042\u308b\u3068\u3002 \u3053\u306e\u8a18\u4e8b\u306fRust 2 Advent Calendar 2020 \u306e [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45358-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-04-22T11:50:29+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-03T23:15:21+00:00\" \/>\n<meta name=\"author\" content=\"\u6e05, \u5b87\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u6e05, \u5b87\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 \u5206\" \/>\n<script type=\"application\/ld+json\" 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