{"id":120964,"date":"2024-03-24T00:43:48","date_gmt":"2024-03-23T15:43:48","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/c-%e3%81%ae-decltype-%e3%82%ad%e3%83%bc%e3%83%af%e3%83%bc%e3%83%89%e3%81%af%e3%80%81%e5%bc%95%e6%95%b0%e3%81%ae%e5%9e%8b%e3%82%92%e8%bf%94%e3%81%99%e5%9e%8b%e6%8e%a8%e8%ab%96%e6%bc%94%e7%ae%97\/"},"modified":"2024-03-27T08:18:51","modified_gmt":"2024-03-26T23:18:51","slug":"c-%e3%81%ae-decltype-%e3%82%ad%e3%83%bc%e3%83%af%e3%83%bc%e3%83%89%e3%81%af%e3%80%81%e5%bc%95%e6%95%b0%e3%81%ae%e5%9e%8b%e3%82%92%e8%bf%94%e3%81%99%e5%9e%8b%e6%8e%a8%e8%ab%96%e6%bc%94%e7%ae%97","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/c-%e3%81%ae-decltype-%e3%82%ad%e3%83%bc%e3%83%af%e3%83%bc%e3%83%89%e3%81%af%e3%80%81%e5%bc%95%e6%95%b0%e3%81%ae%e5%9e%8b%e3%82%92%e8%bf%94%e3%81%99%e5%9e%8b%e6%8e%a8%e8%ab%96%e6%bc%94%e7%ae%97\/","title":{"rendered":"c++ \u306e decltype \u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001\u5f15\u6570\u306e\u578b\u3092\u8fd4\u3059\u578b\u63a8\u8ad6\u6f14\u7b97\u5b50\u3067\u3059\u3002"},"content":{"rendered":"<p>decltype\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u4e3b\u306a\u6a5f\u80fd\u306f\u5f0f\u5185\u306e\u578b\u306e\u63a8\u8ad6\u306b\u7528\u3044\u3089\u308c\u308b\u3082\u306e\u3067\u3059\u3002\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u5f0f\u5185\u306e\u578b\u304b\u3089\u305d\u306e\u578b\u3092\u63a8\u8ad6\u3057\u3001decltype\u306e\u7d50\u679c\u3068\u3057\u3066\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n<p>decltype \u306e\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>decltype(expression)\r\n<\/code><\/pre>\n<p>expression\u306f\u5f0f\u3067\u3001decltype\u306fexpression\u306e\u578b\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>decltype \u306f\u6b21\u306e\u5834\u5408\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<ol>\n<li>\u95a2\u6570\u306e\u623b\u308a\u5024\u306e\u578b\u3092decltype\u3092\u4f7f\u7528\u3057\u3066\u63a8\u8ad6\u3067\u304d\u307e\u3059\u3002\u623b\u308a\u5024\u306e\u578b\u304c\u8907\u96d1\u3067\u3042\u3063\u305f\u308a\u3001\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\u5834\u5408\u306a\u3069\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/li>\n<li>\u5909\u6570\u578b\u306e\u63a8\u8ad6\u3002decltype\u306f\u3001\u7279\u306b\u5909\u6570\u578b\u304c\u4ed6\u306e\u5909\u6570\u3084\u5f0f\u306b\u4f9d\u5b58\u3059\u308b\u3068\u304d\u306b\u3001\u5909\u6570\u306e\u578b\u3092\u63a8\u8ad6\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3067\u304d\u308b\u3002<\/li>\n<li>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u5f15\u6570\u306e\u578b\u306e\u63a8\u8ad6\uff1adecltype\u306f\u3001\u7279\u306b\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u5f15\u6570\u306e\u578b\u3092\u5b9f\u5f15\u6570\u578b\u304b\u3089\u63a8\u8ad6\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306b\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u5f15\u6570\u306e\u578b\u3092\u63a8\u8ad6\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>decltype \u3092\u4f7f\u7528\u3059\u308b\u4f8b\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">int<\/span> x = <span class=\"hljs-number\">10<\/span>;\r\n<span class=\"hljs-keyword\">decltype<\/span>(x) y; <span class=\"hljs-comment\">\/\/ \u63a8\u65ady\u7684\u7c7b\u578b\u4e3aint<\/span>\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title\">add<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> a, <span class=\"hljs-type\">int<\/span> b)<\/span> <\/span>{\r\n<span class=\"hljs-keyword\">return<\/span> a + b;\r\n}\r\n<span class=\"hljs-keyword\">decltype<\/span>(<span class=\"hljs-built_in\">add<\/span>(<span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">5<\/span>)) result; <span class=\"hljs-comment\">\/\/ \u63a8\u65adresult\u7684\u7c7b\u578b\u4e3aint<\/span>\r\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">template<\/span>&lt;<span class=\"hljs-keyword\">typename<\/span> T, <span class=\"hljs-keyword\">typename<\/span> U&gt;\r\n<span class=\"hljs-keyword\">auto<\/span> <span class=\"hljs-title\">multiply<\/span><span class=\"hljs-params\">(T a, U b)<\/span> -&gt; <span class=\"hljs-title\">decltype<\/span><span class=\"hljs-params\">(a * b)<\/span> <\/span>{\r\n<span class=\"hljs-keyword\">return<\/span> a * b;\r\n}\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span> <\/span>{\r\n<span class=\"hljs-type\">int<\/span> x = <span class=\"hljs-number\">3<\/span>;\r\n<span class=\"hljs-type\">double<\/span> y = <span class=\"hljs-number\">2.5<\/span>;\r\n<span class=\"hljs-keyword\">auto<\/span> z = <span class=\"hljs-built_in\">multiply<\/span>(x, y); <span class=\"hljs-comment\">\/\/ \u63a8\u65adz\u7684\u7c7b\u578b\u4e3adouble<\/span>\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>\u8981\u3059\u308b\u306b\u3001decltype \u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001\u5f0f\u306e\u578b\u304b\u3089\u5bfe\u5fdc\u3059\u308b\u578b\u3092\u5c0e\u51fa\u3067\u304d\u308b\u305f\u3081\u3001\u3088\u308a\u67d4\u8edf\u306a\u578b\u63a8\u8ad6\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u3066\u304a\u308a\u3001\u8907\u96d1\u306a\u30b1\u30fc\u30b9\u3067\u3082\u7c21\u5358\u306b\u578b\u3092\u63a8\u8ad6\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>decltype\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u4e3b\u306a\u6a5f\u80fd\u306f\u5f0f\u5185\u306e\u578b\u306e\u63a8\u8ad6\u306b\u7528\u3044\u3089\u308c\u308b\u3082\u306e\u3067\u3059\u3002\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u5f0f\u5185\u306e\u578b\u304b\u3089\u305d\u306e\u578b\u3092\u63a8\u8ad6\u3057\u3001decltype\u306e\u7d50\u679c\u3068\u3057\u3066\u51fa\u529b\u3057\u307e\u3059\u3002 decltype \u306e\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002 decltype [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-120964","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>c++ \u306e decltype \u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001\u5f15\u6570\u306e\u578b\u3092\u8fd4\u3059\u578b\u63a8\u8ad6\u6f14\u7b97\u5b50\u3067\u3059\u3002 - 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\" 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