{"id":9704,"date":"2024-03-15T03:35:21","date_gmt":"2024-03-14T18:35:21","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/c%e3%81%a7%e3%81%aeoptional%e3%81%ae%e5%80%a4%e3%81%ae%e5%8f%96%e3%82%8a%e6%96%b9%e3%81%af%ef%bc%9f\/"},"modified":"2025-08-04T03:13:45","modified_gmt":"2025-08-03T18:13:45","slug":"c%e3%81%a7%e3%81%aeoptional%e3%81%ae%e5%80%a4%e3%81%ae%e5%8f%96%e3%82%8a%e6%96%b9%e3%81%af%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/c%e3%81%a7%e3%81%aeoptional%e3%81%ae%e5%80%a4%e3%81%ae%e5%8f%96%e3%82%8a%e6%96%b9%e3%81%af%ef%bc%9f\/","title":{"rendered":"C++ optional \u5024\u306e\u53d6\u308a\u51fa\u3057\u65b9\u3010\u5b89\u5168\u306a\u30a2\u30af\u30bb\u30b9\u65b9\u6cd5\u3011"},"content":{"rendered":"<p>C++\u3067optional\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5024\u3092\u53d6\u5f97\u3059\u308b\u306b\u306f\u3001value()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u5024\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u53c2\u7167\u3092\u8fd4\u3057\u3001optional\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7a7a\u306e\u5834\u5408\u3001std::bad_optional_access\u4f8b\u5916\u304c\u30b9\u30ed\u30fc\u3055\u308c\u307e\u3059\u3002\u307e\u305f\u3001operator*\u3084operator-&gt;\u3092\u4f7f\u7528\u3057\u3066\u5024\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u304c\u3001\u3053\u308c\u3089\u306e\u65b9\u6cd5\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7a7a\u306e\u5834\u5408\u3001\u672a\u5b9a\u7fa9\u306e\u52d5\u4f5c\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u6ce8\u610f\u3057\u3066\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u4f8b\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code>std::optional&lt;<span class=\"hljs-type\">int<\/span>&gt; opt = <span class=\"hljs-number\">42<\/span>;\r\n\r\n<span class=\"hljs-comment\">\/\/ \u4f7f\u7528value()\u65b9\u6cd5\u83b7\u53d6\u503c<\/span>\r\n<span class=\"hljs-type\">int<\/span> value = opt.<span class=\"hljs-built_in\">value<\/span>();\r\nstd::cout &lt;&lt; <span class=\"hljs-string\">\"Value: \"<\/span> &lt;&lt; value &lt;&lt; std::endl;\r\n\r\n<span class=\"hljs-comment\">\/\/ \u4f7f\u7528operator*\u83b7\u53d6\u503c<\/span>\r\n<span class=\"hljs-type\">int<\/span> value2 = *opt;\r\nstd::cout &lt;&lt; <span class=\"hljs-string\">\"Value: \"<\/span> &lt;&lt; value2 &lt;&lt; std::endl;\r\n\r\n<span class=\"hljs-comment\">\/\/ \u4f7f\u7528operator-&gt;\u83b7\u53d6\u503c<\/span>\r\n<span class=\"hljs-type\">int<\/span> value3 = opt-&gt;<span class=\"hljs-built_in\">value<\/span>();\r\nstd::cout &lt;&lt; <span class=\"hljs-string\">\"Value: \"<\/span> &lt;&lt; value3 &lt;&lt; std::endl;\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>C++\u3067optional\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5024\u3092\u53d6\u5f97\u3059\u308b\u306b\u306f\u3001value()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u5024\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u53c2\u7167\u3092\u8fd4\u3057\u3001optional\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7a7a\u306e\u5834\u5408\u3001std::bad_optional_access [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[85,4143,434,26,4147],"class_list":["post-9704","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c","tag-optional","tag-434","tag-26","tag-4147"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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