{"id":28591,"date":"2024-03-16T10:37:39","date_gmt":"2024-03-16T10:37:39","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-use-explicit-in-c\/"},"modified":"2024-03-22T13:49:27","modified_gmt":"2024-03-22T13:49:27","slug":"how-to-use-explicit-in-c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-use-explicit-in-c\/","title":{"rendered":"How to use &#8216;explicit&#8217; in C++?"},"content":{"rendered":"<p>In C++, the keyword &#8216;explicit&#8217; is used to modify single parameter constructor functions to prevent implicit conversion. When a single parameter constructor function is marked with the &#8216;explicit&#8217; keyword, it can only be called explicitly and cannot be used in implicit conversions.<\/p>\n<p>Here is an example of using the explicit keyword:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyInt<\/span> {\r\n<span class=\"hljs-keyword\">public<\/span>:\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">explicit<\/span> <span class=\"hljs-title\">MyInt<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> num)<\/span> : value(num) {<\/span>}\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title\">getValue<\/span><span class=\"hljs-params\">()<\/span> <span class=\"hljs-type\">const<\/span> <\/span>{\r\n        <span class=\"hljs-keyword\">return<\/span> value;\r\n    }\r\n\r\n<span class=\"hljs-keyword\">private<\/span>:\r\n    <span class=\"hljs-type\">int<\/span> value;\r\n};\r\n\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">void<\/span> <span class=\"hljs-title\">printInt<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">const<\/span> MyInt&amp; num)<\/span> <\/span>{\r\n    std::cout &lt;&lt; num.<span class=\"hljs-built_in\">getValue<\/span>() &lt;&lt; std::endl;\r\n}\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-function\">MyInt <span class=\"hljs-title\">myNum<\/span><span class=\"hljs-params\">(<span class=\"hljs-number\">5<\/span>)<\/span><\/span>; <span class=\"hljs-comment\">\/\/ \u76f4\u63a5\u8c03\u7528\u6784\u9020\u51fd\u6570<\/span>\r\n    <span class=\"hljs-built_in\">printInt<\/span>(myNum); <span class=\"hljs-comment\">\/\/ \u9690\u5f0f\u8f6c\u6362\u4e3aMyInt\u5bf9\u8c61\uff0c\u901a\u8fc7\u663e\u5f0f\u8c03\u7528\u7684\u65b9\u5f0f\u4f20\u9012\u7ed9printInt\u51fd\u6570<\/span>\r\n    <span class=\"hljs-comment\">\/\/ printInt(5); \/\/ \u9519\u8bef\uff0c\u4e0d\u80fd\u9690\u5f0f\u8f6c\u6362\u4e3aMyInt\u5bf9\u8c61<\/span>\r\n    <span class=\"hljs-built_in\">printInt<\/span>(<span class=\"hljs-built_in\">MyInt<\/span>(<span class=\"hljs-number\">10<\/span>)); <span class=\"hljs-comment\">\/\/ \u53ef\u4ee5\u663e\u5f0f\u5730\u8c03\u7528\u6784\u9020\u51fd\u6570<\/span>\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>In the example above, the MyInt class has a single parameter constructor with the explicit keyword, meaning that an integer cannot be implicitly converted to a MyInt object. Only by explicitly calling the constructor can a MyInt object be created. In the main function, it can be seen that it is incorrect to call the printInt function with implicit conversion, but it is possible to pass a MyInt object to the printInt function by explicitly calling the constructor.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In C++, the keyword &#8216;explicit&#8217; is used to modify single parameter constructor functions to prevent implicit conversion. When a single parameter constructor function is marked with the &#8216;explicit&#8217; keyword, it can only be called explicitly and cannot be used in implicit conversions. Here is an example of using the explicit keyword: class MyInt { public: [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-28591","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>How to use &#039;explicit&#039; in C++? - 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\/blog\/how-to-use-explicit-in-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to use &#039;explicit&#039; in C++?\" \/>\n<meta property=\"og:description\" content=\"In C++, the keyword &#8216;explicit&#8217; is used to modify single parameter constructor functions to prevent implicit conversion. When a single parameter constructor function is marked with the &#8216;explicit&#8217; keyword, it can only be called explicitly and cannot be used in implicit conversions. Here is an example of using the explicit keyword: class MyInt { public: [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-to-use-explicit-in-c\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-16T10:37:39+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-22T13:49:27+00:00\" \/>\n<meta name=\"author\" content=\"Sophia Anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:site\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Sophia Anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-use-explicit-in-c\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-use-explicit-in-c\/\"},\"author\":{\"name\":\"Sophia Anderson\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/19a24313de9c988db3d69226b4a40a30\"},\"headline\":\"How to use &#8216;explicit&#8217; in C++?\",\"datePublished\":\"2024-03-16T10:37:39+00:00\",\"dateModified\":\"2024-03-22T13:49:27+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-use-explicit-in-c\/\"},\"wordCount\":135,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-use-explicit-in-c\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-to-use-explicit-in-c\/\",\"name\":\"How to use 'explicit' in C++? 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