{"id":150,"date":"2019-08-09T12:39:35","date_gmt":"2019-08-09T12:39:35","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=150"},"modified":"2019-11-18T05:10:50","modified_gmt":"2019-11-18T05:10:50","slug":"inheritance-go-interface-struct","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/inheritance-go-interface-struct\/","title":{"rendered":"Inheritance in GO using interface + struct"},"content":{"rendered":"\n<p class=\"has-medium-font-size\">This post describes inheritance using interface and struct. 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=\"OtvYyDmPmR\"><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=EpVuUFYEMN#?secret=OtvYyDmPmR\" data-secret=\"OtvYyDmPmR\" 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>By using embedded struct &#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. Refer this link for more details &#8211; <a href=\"https:\/\/golangbyexamples.com\/inheritance-go-struct\/\"><strong>Inheritance using Struct<\/strong><\/a><strong>   <\/strong>                                         <\/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><strong>By using interface + struct<\/strong> &#8211;  This fixes the limitations of above two approach but one limitation is that overriding methods is not possible. But there is workaround. Current post describes this approach<\/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 this approach, the base struct is embedded in child struct and base struct implements all methods of the common interface. So child struct can: <\/p>\n\n\n\n<ol class=\"has-medium-font-size wp-block-list\"><li>Access methods and properties of base struct<\/li><li>Since base struct implements all functions of the common interface, the common interface itself can be used for subtyping.  <\/li><\/ol>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport \"fmt\"\n\ntype iBase interface {\n\tsay()\n}\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 iBase) {\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\tcheck(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\nsomevalue\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>This post describes inheritance using interface and struct. Do visit our Inheritance in Go Complete Guide post for full reference Go supports inheritance by embedding struct or using interface. There are different&#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":[],"class_list":["post-150","post","type-post","status-publish","format-standard","hentry","category-tech"],"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 interface + struct - 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-interface-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 interface + struct - Welcome To Golang By Example\" \/>\n<meta property=\"og:description\" content=\"This post describes inheritance using interface and struct. 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