Why am I unable to use a struct defined in a different package?

golang import struct from same package
golang undeclared name same package
golang import struct from another package
golang packages
go use function from another file
golang package naming
golang import main package
cannot refer to unexported name

I am unable to use a struct in package main which has been defined in a different package. Please note that I am importing the other package correctly

I named the struct and its fields starting with a capital letter because I read that in Golang that is how we indicate that it is an exported field. Although it is not required if the package is imported.

fsm.go

package fsm

import (
"fmt"
"strings"
 )
// EKey is a struct key used for storing the transition map.
type EKey struct {
// event is the name of the event that the keys refers to.
Event string

// src is the source from where the event can transition.
Src string
}

test.go

package main

import (
"encoding/json"
"fmt"

"github.com/looplab/fsm"
) 
func main(){
    Transitions := make(map[EKey]string) 
}

Error: undefined EKey

You have to first import the package whose identifiers you want to refer to:

import "path/to/fsm"

Once you do this, the package name fsm becomes a new identifier in your file block, and you can refer to its exported identifiers (identifiers that start with an uppercase letter) by using a qualified identifier, which is packagename.IdentifierName like this:

Transitions := make(map[fsm.EKey]string)

See related question: Getting a use of package without selector error

can't find struct in a same package - Getting Help, vscode was able to instantiate struct across files(vscode+go1.12.4) package main import "fmt" type su struct { Sfd string Sf int } func (sed *su) do() { fmt. the struct and function, then import that new package into main.go . Arrays allow to define type of variables that can hold several data items of the same kind. Similarly structure is another user defined data type available in C that allows to combine data items of different kinds. Structures are used to represent a record. Suppose you want to keep track of your

You need to refer to your struct using fsm.EKey

If you want to import it to your local name space, you need a dot before the import path.

import (
   // ....
   . "github.com/looplab/fsm"
)

Now you can refer to your struct directly as EKey

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try this

package main

import (
"encoding/json"
"fmt"

"github.com/looplab/fsm"
) 
func main(){
    Transitions := make(map[fsm.EKey]string) 
}

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Comments
  • While not recommended it is also possible to add a dot in front of the import, in which case "all the package's exported identifiers declared in that package's package block will be declared in the importing source file's file block and must be accessed without a qualifier." read more here