{"id":45580,"date":"2023-07-15T10:04:35","date_gmt":"2023-12-06T09:39:59","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45580-2\/"},"modified":"2024-04-30T13:39:47","modified_gmt":"2024-04-30T05:39:47","slug":"45580-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45580-2\/","title":{"rendered":""},"content":{"rendered":"<h2>tl;dr<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Rust\u306e\u7df4\u7fd2\u306e\u305f\u3081\u30b2\u30fc\u30e0\u3092\u4f5c\u3063\u305f<\/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\">Box\u3092\u7528\u3044\u308c\u3070trait\u3067\u3082struct\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u578b\u306b\u3067\u304d\u308b(\u30c8\u30ec\u30a4\u30c8\u30aa\u30d6\u30b8\u30a7\u30af\u30c8)<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Rust\u306fDST\u3068\u3044\u3046\u4ed5\u7d44\u307f\u3092\u7528\u3044\u3066\u7d99\u627f\u306e\u69d8\u306a\u4ed5\u7d44\u307f\u3092\u53d6\u308a\u5165\u308c\u3066\u3044\u308b<\/ul>\n<h2>\u306f\u3058\u3081\u306b<\/h2>\n<p>8\u6708\u672b\u304b\u3089Rust\u3092\u59cb\u3081\u307e\u3057\u305f\u3002\u52c9\u5f37\u306e\u305f\u3081\u306b\u4f55\u304b\u4f5c\u308d\u3046\u3068\u601d\u3044Rust-SDL2\u3092\u4f7f\u3063\u305f\u30d1\u30c3\u30af\u30de\u30f3\u98a8(\u203b1)\u306e\u30b2\u30fc\u30e0\u300crust_pack_man\u300d\u3092\u4f5c\u6210\u3057\u307e\u3057\u305f\u3002\u4ee5\u4e0b\u307f\u305f\u3044\u306a\u3084\u3064\u3067\u3059\u3002\u30b2\u30fc\u30e0\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u4f5c\u6210\u306b\u82e6\u6226\u3057\u305f\u306e\u3067\u3001\u305d\u3053\u306e\u5b9f\u88c5\u306b\u3064\u3044\u3066\u66f8\u304d\u307e\u3059\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d601d37434c4406cf9f08\/4-0.gif\" alt=\"packman.gif\" \/><\/div>\n<h2>\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u4f5c\u6210<\/h2>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d601d37434c4406cf9f08\/6-0.png\" alt=\"field\u5b9a\u7fa9text.png\" \/><\/div>\n<h2>\u82e6\u6226\u3057\u305f\u5185\u5bb9<\/h2>\n<p>\u3069\u306e\u30bb\u30eb\u3067\u3082\u540c\u3058\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u63cf\u753b\u3059\u308b\u69d8\u306b\u5b9f\u88c5\u3059\u308b\u306e\u306b\u82e6\u6226\u3057\u307e\u3057\u305f\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u306a\u3089\u89aa\u30af\u30e9\u30b9BaseCell\u3068\u304b\u4f5c\u3063\u3066\u5171\u901a\u306e\u51e6\u7406\u3092\u66f8\u304d\u3001ItemCell\u3068\u304bWallCell\u3068\u304b\u306e\u5b50\u30af\u30e9\u30b9\u306b\u7d99\u627f\u3055\u305b\u308b\u3068\u3053\u308d\u3067\u3057\u3087\u3046\u304b\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u306e\u69d8\u306a\u66f8\u304d\u65b9\u306b\u3064\u3044\u3066\u306f\u65e2\u306b@nacika_ins\u3055\u3093\u304c12\/6\u306b\u66f8\u3044\u3066\u304a\u308a\u307e\u3059\u3002<br \/>\n\u306a\u306e\u3067trait\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u3064\u3044\u3066\u79c1\u306f\u66f8\u3053\u3046\u3068\u601d\u3044\u307e\u3059\u3002Box\u3092\u7528\u3044\u308b\u3053\u3068\u3067trait\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u3044\u3046\u3082\u306e\u306b\u5909\u63db\u3067\u304d\u307e\u3059(Box\u5316)\u3002\u3053\u3046\u3059\u308b\u3068struct\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u578b\u3068\u3057\u3066trait\u304c\u4f7f\u7528\u3067\u304d\u308b\u69d8\u306b\u306a\u308a\u307e\u3059\u3002trait\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306b\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5b89\u5168(Object Safety)\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u304c\u3001trait\u304c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5b89\u5168\u3067\u3042\u308b\u305f\u3081\u306b\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u306e\u307f\u7528\u3044\u308b\u5fc5\u8981\u304c\u3042\u308b\u69d8\u3067\u3059(\u203b2)\u3002\u6700\u7d42\u7684\u306a\u30b3\u30fc\u30c9\u3068\u3057\u3066\u306f\u4ee5\u4e0b\u306b\u8fd1\u3044\u5f62\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">struct<\/span> <span class=\"n\">Field<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">field_rows<\/span><span class=\"p\">:<\/span> <span class=\"nb\">Vec<\/span><span class=\"o\">&lt;<\/span><span class=\"n\">FieldRow<\/span><span class=\"o\">&gt;<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">struct<\/span> <span class=\"n\">FieldRow<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">field_cells<\/span><span class=\"p\">:<\/span> <span class=\"nb\">Vec<\/span><span class=\"o\">&lt;<\/span><span class=\"nb\">Box<\/span><span class=\"o\">&lt;<\/span><span class=\"n\">BaseCell<\/span><span class=\"o\">&gt;&gt;<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">trait<\/span> <span class=\"n\">BaseCell<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">draw<\/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=\"cm\">\/* \u5171\u901a\u51e6\u7406 *\/<\/span>\r\n\r\n        <span class=\"k\">self<\/span><span class=\"nf\">.unique_draw<\/span><span class=\"p\">();<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">unique_draw<\/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\r\n<span class=\"k\">struct<\/span> <span class=\"n\">ItemCell<\/span> <span class=\"p\">{}<\/span>\r\n<span class=\"k\">impl<\/span> <span class=\"n\">BaseCell<\/span> <span class=\"k\">for<\/span> <span class=\"n\">ItemCell<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">unique_draw<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">self<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span><span class=\"cm\">\/* \u7565 *\/<\/span><span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">struct<\/span> <span class=\"n\">WallCell<\/span> <span class=\"p\">{}<\/span>\r\n<span class=\"k\">impl<\/span> <span class=\"n\">BaseCell<\/span> <span class=\"k\">for<\/span> <span class=\"n\">WallCell<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">unique_draw<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">self<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span><span class=\"cm\">\/* \u7565 *\/<\/span><span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u4f55\u6545trait\u306f\u30b5\u30a4\u30ba\u4e0d\u5b9a\u306a\u306e?<\/h2>\n<pre class=\"post-pre\"><code>\u3000XXX 'static` does not have a constant size known at compile-time\r\n<\/code><\/pre>\n<p>XXXtrait\u3092trait\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u3057\u306a\u3044\u3067struct\u306efield\u306e\u578b\u306b\u8a2d\u5b9a\u3059\u308b\u3068\u51fa\u3066\u304f\u308b\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3067\u3059\u3002trait\u304c\u30b5\u30a4\u30ba\u4e0d\u5b9a\u306e\u305f\u3081\u306b\u51fa\u3066\u304d\u3066\u3044\u308b\u69d8\u3067\u3059\u3002\u3058\u3083\u3042\u305d\u3082\u305d\u3082\u4f55\u6545\u30b5\u30a4\u30ba\u4e0d\u5b9a\u306a\u3082\u306e\u306a\u3093\u3066\u5b9f\u88c5\u3057\u3066\u3044\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3002\u6c17\u306b\u306a\u3063\u305f\u306e\u3067\u8abf\u3079\u305f\u3068\u3053\u308dDynamically Sized Type(DST)\u3068\u3044\u3046\u5358\u8a9e\u304c\u767b\u5834\u3057\u3066\u304d\u307e\u3057\u305f\u3002<br \/>\nDST\u3068\u306f\u6587\u5b57\u901a\u308a\u30b5\u30a4\u30ba\u4e0d\u5b9a\u306e\u30bf\u30a4\u30d7\u306e\u4e8b\u3067\u4e3b\u306bslice\u3068trait\u306e\u3053\u3068\u3092\u6307\u3059\u305d\u3046\u3067\u3059\u3002DST\u304c\u5b9f\u88c5\u3055\u308c\u305f\u7406\u7531\u306e1\u3064\u306b\u7d99\u627f\u306b\u8fd1\u3044\u4ed5\u7d44\u307f\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u3068\u3044\u3046\u3082\u306e\u304c\u3042\u308b\u305d\u3046\u3067\u3059\u3002\u78ba\u304b\u306b\u62bd\u8c61\u30af\u30e9\u30b9\u3084interface\u306e\u69d8\u306a\u3053\u3068\u3092\u3057\u305f\u3044\u5834\u5408\u3001\u52d5\u7684\u306b\u30b5\u30a4\u30ba\u3092\u5909\u66f4\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u69d8\u306a\u6c17\u304c\u3057\u307e\u3059(\u203b3)\u3002\u3057\u304b\u3057\u305d\u308c\u3067\u306f\u578b\u691c\u67fb\u3084\u6027\u80fd\u306e\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u305f\u3081Box\u5316\u3084impl\u3092\u7528\u3044\u3066struct\u306b\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3067fat\u30dd\u30a4\u30f3\u30bf\u3068\u3044\u3046\u3082\u306e\u3092\u4f5c\u308a\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u306b\u5fc5\u8981\u306a\u60c5\u5831\u3092\u88dc\u5b8c\u3059\u308b\u69d8\u3067\u3059\u3002<\/p>\n<h2>\u6700\u5f8c\u306b<\/h2>\n<p>JavaScript\u3068\u304b\u3057\u304b\u666e\u6bb5\u66f8\u3044\u3066\u3044\u306a\u3044\u4eba\u9593\u304b\u3089\u3059\u308b\u3068Rust\u306f\u304b\u306a\u308a\u96e3\u3057\u3044\u3068\u306f\u601d\u3044\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u60f3\u50cf\u4ee5\u4e0a\u306b\u65e5\u672c\u8a9e\u306e\u60c5\u5831\u304c\u591a\u304f\u3001\u8abf\u3079\u308c\u3070\u5927\u4f53\u4f55\u304b\u65e5\u672c\u8a9e\u3067\u89e3\u6c7a\u7b56\u304c\u898b\u3064\u304b\u308a\u307e\u3059\u3002\u5148\u4eba\u306e\u7686\u69d8\u306b\u306f\u611f\u8b1d\u306e\u8a00\u8449\u3057\u304b\u306a\u3044\u3067\u3059\u3002\u73fe\u5728rust_pack_man\u306fWebAssembly\u5316\u306e\u771f\u3063\u6700\u4e2d\u3067\u3059\u3002\u305d\u308c\u306b\u3064\u3044\u3066\u306f\u3053\u3061\u3089\u3092\u3069\u3046\u305e\u3002<\/p>\n<h3>\u5099\u8003<\/h3>\n<p>\u203b1\u3000\u7b46\u8005\u306f\u5b9f\u969b\u306b\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u30d1\u30c3\u30af\u30de\u30f3\u3092\u3084\u3063\u305f\u3053\u3068\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u591a\u5206\u3053\u3093\u306a\u3060\u308d\u3046\u3068\u3044\u3046\u96f0\u56f2\u6c17\u3067\u4f5c\u3089\u308c\u3066\u3044\u307e\u3059<br \/>\n\u203b2\u3000\u5177\u4f53\u7684\u306a\u7406\u7531\u3092\u63a2\u3057\u307e\u3057\u305f\u304c\u767a\u898b\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u2026\u305d\u3082\u305d\u3082\u56de\u907f\u3059\u308b\u65b9\u6cd5\u3082\u3042\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093<br \/>\n\u203b3\u3000\u7b46\u8005\u306f\u8a00\u8a9e\u3092\u4f5c\u6210\u3057\u305f\u3053\u3068\u304c\u306a\u3044\u306e\u3067\u60f3\u50cf\u306e\u7bc4\u56f2\u3067\u3057\u304b\u3042\u308a\u307e\u305b\u3093<\/p>\n<h3>\u53c2\u8003\u30ea\u30f3\u30af<\/h3>\n<p>\u6c17\u5408\u3092\u5165\u308c\u3066\u8abf\u3079\u305f\u3051\u3069\u6700\u5f8c\u306e\u65e5\u672c\u8a9e\u8a18\u4e8b\u3067\u5927\u4f53\u4e8b\u8db3\u308a\u307e\u3057\u305f\u2026<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">https:\/\/doc.rust-lang.org\/nomicon\/exotic-sizes.html#dynamically-sized-types-dsts<\/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\">https:\/\/stackoverflow.com\/questions\/28044231\/what-does-sized-is-not-implemented-mean<\/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\">http:\/\/huonw.github.io\/blog\/2015\/01\/the-sized-trait\/<\/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\">http:\/\/smallcultfollowing.com\/babysteps\/blog\/2014\/01\/05\/dst-take-5\/<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">https:\/\/ja.stackoverflow.com\/questions\/34317\/rust-vec-\u306b\u30c8\u30ec\u30a4\u30c8\u3092\u5b9f\u88c5\u3057\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u683c\u7d0d\u3057\u305f\u3044<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>tl;dr Rust\u306e\u7df4\u7fd2\u306e\u305f\u3081\u30b2\u30fc\u30e0\u3092\u4f5c\u3063\u305f &nbsp; Box\u3092\u7528\u3044\u308c\u3070trait\u3067\u3082struct\u306e\u30d5\u30a3 [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45580","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\/45580-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"tl;dr Rust\u306e\u7df4\u7fd2\u306e\u305f\u3081\u30b2\u30fc\u30e0\u3092\u4f5c\u3063\u305f &nbsp; 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