CODEWITHSUNDEEP
go
Akshay Sood
Akshay Sood

Reputation: 6776

use structure declared in main.go in other package

I have a structure declared in main.go as shown below:

type Organization struct {
    ID    string `json:"id"`
    Count int    `json:"count"` //node count
}

I have a package named configuration and have a function like this:

func foo(org main.Organization) {

}

The issue is I am not able to access main.Organization. Is there any way to access struct declared in main.go in another package?

Upvotes: 5

Views: 3542

Answers (2)

nos
nos

Reputation: 229058

You can't import the main package from other packages in go(except in certain situations, such as a test case).

Instead create a new directory e.g. named mytypes , In this folder create the file types.go which would look like:

package mytypes
type Organization struct {
    ID    string `json:"id"`
    Count int    `json:"count"` //node count
}

Wherever you want to use this struct, such as in main an , you import "mytypes" and use the Organization struct as mytypes.Organization

Alternatively, you move the Organization struct to your configuration package and use configuration.Organization in your main.

Upvotes: 4

Adam Smith
Adam Smith

Reputation: 54163

It's not possible to import package main except in certain rare circumstances.

I found this explanation on a mailing list dated back last year.

However importing a main package in another main package works. To summarize:

1) importing a main package in a external test is supported
2) importing a main package in a main package is supported
3) importing a main package in a non main package is not supported

This seems reasonable to me, however AFAIK it is not documented.

From the language spec

A complete program is created by linking a single, unimported package called the main package with all the packages it imports, transitively. The main package must have package name main and declare a function main that takes no arguments and returns no value.

(emphasis mine in both quotes)

Upvotes: 7

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