import struct in go, get "not a type" error

Question

I import a struct defined in another package, when try to use it to construct a literal, get a "not a type" error.

In publish.go

type Book struct {
    Name string
    Author string
    Published bool
}

In store.go

import "publish"

func Init() {
    var reading publish.Book

    b := &reading {
        Name: "Learn Go Lang",
        Author: "Rob",
        Published: true
    }
}

Error: reading is not a type

Benjamin Kadish · Accepted Answer · 2017-03-15 22:34:49Z

4

Here you try to make a struct of Type "reading"

b := &reading {
       Name: "Learn Go Lang",
       Author: "Rob",
       Published: true
    }

What you want is a struct of type publish.Book

b := & publish.Book {
       Name: "Learn Go Lang",
       Author: "Rob",
       Published: true,
    }

plus you also need a comma at the end of the last in a multi-line struct declaration.

answered Mar 15, 2017 at 22:34

Benjamin Kadish

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4 Comments

user3670618 Over a year ago

Hi Ben, Thanks for the response. Yes, directly use &publish.Book{...} works. But I'm wondering why I cannot make a local instance: var reading publish.Book, and then &reading{...} ??

Treesrule14 Over a year ago

var reading publish.Book declares a variable of Book, it doesn't create an alias of that type. If you want you can assign to the elements of reading using reading.Name = "Learn Go Lang" etc...

user3670618 Over a year ago

what does "a variable of Book" mean? if it does not equivalent to alias or instance of that type?

Benjamin Kadish Over a year ago

alias and instance are not equivalent. An Alias is a renaming of a type. You can have multiple instances of the same type. (I meant a variable of type book).

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