{"id":8583,"date":"2022-09-14T11:56:55","date_gmt":"2022-09-14T06:26:55","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/"},"modified":"2022-09-14T11:56:55","modified_gmt":"2022-09-14T06:26:55","slug":"solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/","title":{"rendered":"[Solved] Is it considered “correct” to use a template for a function\/class that only accepts subclasses of a specific class?"},"content":{"rendered":"

[ad_1]
\n<\/p>\n

\n
\n
<\/div>\n
\n
\n

It’s quite common, actually almost all templates have certain requirements towards their arguments. Those are usually implicitly clear from how the template parameter is used, but you can improve the error messages by using type traits<\/a>. In C++11, they are available from the standard library via #include <type_traits><\/code>, otherwise look into Boost.TypeTraits<\/a>.<\/p>\n

With C++11, the usage is quite simple when you also use static_assert<\/code>:<\/p>\n

template< typename T >\nstd::shared_ptr< T > spawn()\n{\n    \/\/ make this the first line in your function to get errors early.\n    \/\/ also note that you can use any compile-time check you like.\n    static_assert( std::is_base_of< Monster, T >::value,\n                   \"T is not derived from Monster\" );\n\n    \/\/ the rest of your code follows here.\n    \/\/ ...\n    \/\/ return ...;\n}\n<\/code><\/pre>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            <\/span> <\/p><\/div>\n<\/div>\n
[ad_2]<\/p>\n
solved Is it considered “correct” to use a template for a function\/class that only accepts subclasses of a specific class? <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] It’s quite common, actually almost all templates have certain requirements towards their arguments. Those are usually implicitly clear from how the template parameter is used, but you can improve the error messages by using type traits. In C++11, they are available from the standard library via #include <type_traits>, otherwise look into Boost.TypeTraits. With C++11, … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,435],"class_list":["post-8583","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-templates"],"yoast_head":"\n[Solved] Is it considered "correct" to use a template for a function\/class that only accepts subclasses of a specific class? - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Is it considered "correct" to use a template for a function\/class that only accepts subclasses of a specific class? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] It’s quite common, actually almost all templates have certain requirements towards their arguments. Those are usually implicitly clear from how the template parameter is used, but you can improve the error messages by using type traits. In C++11, they are available from the standard library via #include <type_traits>, otherwise look into Boost.TypeTraits. With C++11, ... Read more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/\" \/>\n<meta property=\"og:site_name\" content=\"JassWeb\" \/>\n<meta property=\"article:published_time\" content=\"2022-09-14T06:26:55+00:00\" \/>\n<meta name=\"author\" content=\"Kirat\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kirat\" \/>\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:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/\"},\"author\":{\"name\":\"Kirat\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\"},\"headline\":\"[Solved] Is it considered “correct” to use a template for a function\/class that only accepts subclasses of a specific class?\",\"datePublished\":\"2022-09-14T06:26:55+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/\"},\"wordCount\":107,\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"keywords\":[\"c++\",\"templates\"],\"articleSection\":[\"Solved\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/\",\"url\":\"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/\",\"name\":\"[Solved] Is it considered \\\"correct\\\" to use a template for a function\/class that only accepts subclasses of a specific class? - JassWeb\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#website\"},\"datePublished\":\"2022-09-14T06:26:55+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/jassweb.com\/solved\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"[Solved] Is it considered “correct” to use a template for a function\/class that only accepts subclasses of a specific class?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/jassweb.com\/solved\/#website\",\"url\":\"https:\/\/jassweb.com\/solved\/\",\"name\":\"JassWeb\",\"description\":\"Build High-quality Websites\",\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/jassweb.com\/solved\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\",\"name\":\"Jass Web\",\"url\":\"https:\/\/jassweb.com\/solved\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png\",\"contentUrl\":\"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png\",\"width\":693,\"height\":132,\"caption\":\"Jass Web\"},\"image\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\",\"name\":\"Kirat\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586\",\"contentUrl\":\"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586\",\"caption\":\"Kirat\"},\"sameAs\":[\"http:\/\/jassweb.com\"],\"url\":\"https:\/\/jassweb.com\/solved\/author\/jaspritsinghghumangmail-com\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"[Solved] Is it considered \"correct\" to use a template for a function\/class that only accepts subclasses of a specific class? - JassWeb","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/","og_locale":"en_US","og_type":"article","og_title":"[Solved] Is it considered \"correct\" to use a template for a function\/class that only accepts subclasses of a specific class? - JassWeb","og_description":"[ad_1] It’s quite common, actually almost all templates have certain requirements towards their arguments. Those are usually implicitly clear from how the template parameter is used, but you can improve the error messages by using type traits. In C++11, they are available from the standard library via #include <type_traits>, otherwise look into Boost.TypeTraits. With C++11, ... Read more","og_url":"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/","og_site_name":"JassWeb","article_published_time":"2022-09-14T06:26:55+00:00","author":"Kirat","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Kirat","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/#article","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/"},"author":{"name":"Kirat","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31"},"headline":"[Solved] Is it considered “correct” to use a template for a function\/class that only accepts subclasses of a specific class?","datePublished":"2022-09-14T06:26:55+00:00","mainEntityOfPage":{"@id":"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/"},"wordCount":107,"publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"keywords":["c++","templates"],"articleSection":["Solved"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/","url":"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/","name":"[Solved] Is it considered \"correct\" to use a template for a function\/class that only accepts subclasses of a specific class? - JassWeb","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/#website"},"datePublished":"2022-09-14T06:26:55+00:00","breadcrumb":{"@id":"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/jassweb.com\/solved\/solved-is-it-considered-correct-to-use-a-template-for-a-function-class-that-only-accepts-subclasses-of-a-specific-class\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/jassweb.com\/solved\/"},{"@type":"ListItem","position":2,"name":"[Solved] Is it considered “correct” to use a template for a function\/class that only accepts subclasses of a specific class?"}]},{"@type":"WebSite","@id":"https:\/\/jassweb.com\/solved\/#website","url":"https:\/\/jassweb.com\/solved\/","name":"JassWeb","description":"Build High-quality Websites","publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/jassweb.com\/solved\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/jassweb.com\/solved\/#organization","name":"Jass Web","url":"https:\/\/jassweb.com\/solved\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/","url":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","contentUrl":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","width":693,"height":132,"caption":"Jass Web"},"image":{"@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31","name":"Kirat","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/image\/","url":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586","contentUrl":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586","caption":"Kirat"},"sameAs":["http:\/\/jassweb.com"],"url":"https:\/\/jassweb.com\/solved\/author\/jaspritsinghghumangmail-com\/"}]}},"_links":{"self":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/8583","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/comments?post=8583"}],"version-history":[{"count":0,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/8583\/revisions"}],"wp:attachment":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/media?parent=8583"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/categories?post=8583"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/tags?post=8583"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}