{"id":5374,"date":"2022-08-28T09:52:53","date_gmt":"2022-08-28T04:22:53","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-cannot-use-makeintchannel-value-of-type-intchannel-as-consumer-value-in-variable-declaration\/"},"modified":"2022-08-28T09:52:53","modified_gmt":"2022-08-28T04:22:53","slug":"solved-cannot-use-makeintchannel-value-of-type-intchannel-as-consumer-value-in-variable-declaration","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-cannot-use-makeintchannel-value-of-type-intchannel-as-consumer-value-in-variable-declaration\/","title":{"rendered":"[Solved] cannot use make(IntChannel) (value of type IntChannel) as Consumer value in variable declaration"},"content":{"rendered":"

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

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First, you declared Consumer<\/code> as a chan<\/code> of interface{ \/* methods *\/ }<\/code>, which most surely isn’t what you want \u2014 as a matter of fact, the error tells that you can’t assign IntChannel<\/code> to it.<\/p>\n

Then, until generics are added to the language, you don’t have a way to preserve type safety.<\/p>\n

The closest solution to what you want to do might be adding an additional method to the interface that returns something that you can range<\/code> over.<\/p>\n

type Consumer interface {\n    OpenChannel()\n    CloseChannel()\n    Range() <-chan interface{}\n}\n\ntype IntChannel chan int\n\nfunc (c IntChannel) OpenChannel() {\n}\n\nfunc (c IntChannel) CloseChannel() {\n}\n\nfunc (c IntChannel) Range() <-chan interface{} {\n    ret := make(chan interface{})\n    go func() {\n        defer close(ret)\n        for v := range c {\n            ret <- v\n        }\n    }()\n    return ret\n}\n\nfunc main() {\n    c := make(IntChannel)\n    var dataChannel Consumer = c\n    go func() {\n        c <- 12\n        close(c)\n    }()\n    for data := range dataChannel.Range() {\n        fmt.Println(data)\n    }\n}\n<\/code><\/pre>\n
Go1 Playground: https:\/\/play.golang.org\/p\/55BpISRVadE<\/a><\/p>\n
\n
With generics (Go 1.18, early 2022), instead you can just define a parametrized type with underlying type chan<\/code>:<\/p>\n
package main\n\nimport \"fmt\"\n\ntype GenericChan[T] chan T\n\nfunc main() {\n    c := make(GenericChan[int])\n    go func() {\n        c <- 12\n        close(c)\n    }()\n    for data := range c {\n        fmt.Println(data)\n    }\n}\n<\/code><\/pre>\n
Go2 Playground: https:\/\/go2goplay.golang.org\/p\/HQJ36ego97i<\/a><\/p>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            2<\/span> <\/p><\/div>\n<\/div>\n
[ad_2]<\/p>\n
solved cannot use make(IntChannel) (value of type IntChannel) as Consumer value in variable declaration <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] First, you declared Consumer as a chan of interface{ \/* methods *\/ }, which most surely isn’t what you want \u2014 as a matter of fact, the error tells that you can’t assign IntChannel to it. Then, until generics are added to the language, you don’t have a way to preserve type safety. The … 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":[1342,596],"class_list":["post-5374","post","type-post","status-publish","format-standard","hentry","category-solved","tag-channel","tag-go"],"yoast_head":"\n[Solved] cannot use make(IntChannel) (value of type IntChannel) as Consumer value in variable declaration - 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-cannot-use-makeintchannel-value-of-type-intchannel-as-consumer-value-in-variable-declaration\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] cannot use make(IntChannel) (value of type IntChannel) as Consumer value in variable declaration - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] First, you declared Consumer as a chan of interface{ \/* methods *\/ }, which most surely isn’t what you want \u2014 as a matter of fact, the error tells that you can’t assign IntChannel to it. 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