--- title: Two cases when forward declaring is not enough | daily.dev description: Two cases when forward declaring is not enough: a 'missing' destructor and covariant return types in overrides. canonical: https://daily.dev/posts/two-cases-when-forward-declaring-is-not-enough-oueyw01wf twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Two cases when forward declaring is not enough | daily.dev og:description: Two cases when forward declaring is not enough: a 'missing' destructor and covariant return types in overrides. og:url: https://daily.dev/posts/two-cases-when-forward-declaring-is-not-enough-oueyw01wf og:image: https://api.daily.dev/og/posts/OUEyW01wF.png og:image:alt: Two cases when forward declaring is not enough og:image:width: 1200 og:image:height: 630 og:locale: en --- [Sandor Dargo](https://daily.dev/sources/sandordargo) [Read post](https://api.daily.dev/r/OUEyW01wF) # [Two cases when forward declaring is not enough](https://api.daily.dev/r/OUEyW01wF "Go to post") Two cases when forward declaring is not enough: a 'missing' destructor and covariant return types in overrides. [#c](/tags/c "Check all #c posts") May 15, 2024•5m read time•From [sandordargo.com](https://api.daily.dev/r/OUEyW01wF "sandordargo.com") [](https://api.daily.dev/r/OUEyW01wF "Go to post") Table of contents [The case of the “missing” destructor](https://api.daily.dev/r/OUEyW01wF?a=the-case-of-the-missing-destructor "The case of the “missing” destructor")[Covariant return types](https://api.daily.dev/r/OUEyW01wF?a=covariant-return-types "Covariant return types")[Conclusion](https://api.daily.dev/r/OUEyW01wF?a=conclusion "Conclusion")[Connect deeper](https://api.daily.dev/r/OUEyW01wF?a=connect-deeper "Connect deeper") 98 Impressions Comment Bookmark Copy Share your thoughtsPost [](https://daily.dev/sources/sandordargo) [Sandor Dargo](https://daily.dev/sources/sandordargo "https://daily.dev/sources/sandordargo") Sandor Dargo's blog provides practical insights into software development, Agile methodologies, and ... Read more 38 Followers • 285 Upvotes #### Would you recommend this post? Copy link WhatsApp Facebook X New Squad Copy linkShare with your friends ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Two cases when forward declaring is not enough","url":"https://daily.dev/posts/two-cases-when-forward-declaring-is-not-enough-oueyw01wf","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/two-cases-when-forward-declaring-is-not-enough-oueyw01wf"},"datePublished":"2024-05-15T20:33:21.273Z","dateModified":"2024-05-15T20:33:19.339Z","description":"Two cases when forward declaring is not enough: a 'missing' destructor and covariant return types in overrides.","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/bc56fe31dfb8fc6b112ce220016c1fe6?_a=AQAEuiZ","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/bc56fe31dfb8fc6b112ce220016c1fe6?_a=AQAEuiZ","isAccessibleForFree":true,"articleSection":"Sandor Dargo","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Sandor Dargo","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/48d17993e5864d66951193405fa786bb","url":"https://daily.dev/sources/sandordargo"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/two-cases-when-forward-declaring-is-not-enough-oueyw01wf","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"c","timeRequired":"PT5M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Sandor Dargo","item":"https://daily.dev/sources/sandordargo"},{"@type":"ListItem","position":3,"name":"Two cases when forward declaring is not enough"}]} ```