{"id":139,"date":"2019-08-09T11:43:04","date_gmt":"2019-08-09T11:43:04","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=139"},"modified":"2021-10-09T08:48:08","modified_gmt":"2021-10-09T03:18:08","slug":"inheritance-go-struct","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/inheritance-go-struct\/","title":{"rendered":"Inheritance in GO using struct (Embedding)"},"content":{"rendered":"\n<p class=\"has-medium-font-size\">This post desicribes inheritance using struct only. Do visit our Inheritance in Go Complete Guide post for full reference<\/p>\n\n\n\n<figure class=\"wp-block-embed-wordpress wp-block-embed is-type-wp-embed is-provider-welcome-to-golang-by-example\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"zH9oZkEbS3\"><a href=\"https:\/\/golangbyexamples.com\/oop-inheritance-golang-complete\/\">OOP: Inheritance in GOLANG complete guide<\/a><\/blockquote><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"&#8220;OOP: Inheritance in GOLANG complete guide&#8221; &#8212; Welcome To Golang By Example\" src=\"https:\/\/golangbyexamples.com\/oop-inheritance-golang-complete\/embed\/#?secret=z8WWaJ1OiI#?secret=zH9oZkEbS3\" data-secret=\"zH9oZkEbS3\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<p class=\"has-medium-font-size\">Go supports inheritance by embedding struct or using interface. There are different ways of doing it and each having some limitations. The different ways are:<\/p>\n\n\n\n<ol class=\"has-medium-font-size wp-block-list\"><li><strong>By using embedded struct<\/strong> &#8211; The parent struct is embedded in child struct. The limitation is that subtyping is not possible with this approach. You cannot pass the child struct to a function that expects base. The current post describes this approach.<\/li><li>By using interfaces &#8211; Subtyping is possible but the limitation is that one has no way to refer to common properties. Refer this link for more details &#8211;  <a href=\"https:\/\/golangbyexamples.com\/inheritance-go-interface\/\"><strong>Inheritance using Interface<\/strong><\/a><\/li><li>By using interface + struct &#8211;  This fixes the limitations of above two approach but one limitation is that overriding methods is not possible. But there is a workaround. Refer to this link for more details &#8211; <a href=\"https:\/\/golangbyexamples.com\/inheritance-go-interface-struct\/\"><strong>Inheritance using interface + struct<\/strong><\/a><\/li><\/ol>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Details:<\/strong><\/p>\n\n\n\n<p class=\"has-medium-font-size\">In inheritance using a struct, a base struct is embedded in child struct and base properties and methods can directly be called on child struct. See below code:<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport \"fmt\"\n\ntype base struct {\n\tvalue string\n}\n\nfunc (b *base) say() {\n\tfmt.Println(b.value)\n}\n\ntype child struct {\n\tbase  \/\/embedding\n\tstyle string\n}\n\nfunc check(b base) {\n\tb.say()\n}\n\nfunc main() {\n\tbase := base{value: \"somevalue\"}\n\tchild := &child{\n\t\tbase:  base,\n\t\tstyle: \"somestyle\",\n\t}\n\tchild.say()\n\t\/\/check(child)\n}\n<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Output:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">somevalue<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Limitation: <\/strong><\/p>\n\n\n\n<p class=\"has-medium-font-size\">Subtyping is not supported. You cannot pass the child struct to a function that expects base. <\/p>\n\n\n\n<p class=\"has-medium-font-size\">For example in the above code if you uncomment  <strong>\/\/check(child)<\/strong> it will give compilation error:  &#8220;cannot use child (type *child) as type base in argument to check&#8221;. To fix this we can do inheritance using Interface<br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This post desicribes inheritance using struct only. Do visit our Inheritance in Go Complete Guide post for full reference Go supports inheritance by embedding struct or using interface. There are different ways&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[1],"tags":[3,4,9,11,10],"class_list":["post-139","post","type-post","status-publish","format-standard","hentry","category-tech","tag-go","tag-golang","tag-inheritance","tag-interface","tag-struct"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Inheritance in GO using struct (Embedding) - Welcome To Golang By Example<\/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:\/\/golangbyexamples.com\/inheritance-go-struct\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Inheritance in GO using struct (Embedding) - Welcome To Golang By Example\" \/>\n<meta property=\"og:description\" content=\"This post desicribes inheritance using struct only. 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