Wire google Inject with multiple returns of provider function

Question content

Following the example of googlewire, we can initialize the event structure in the following way

message.go:

type message string

func newmessage() message {
    //tbd    
}

event.go

func newevent(g message ) event {
    return event{message : g}
}

type event struct {
    message message
}

func (e event) start() {
   fmt.println(msg)
}

We can initialize via line:

func main() {
    e := initializeevent()
    e.start()
}
    
func initializeevent() event {
    wire.build(newevent, newmessage)
    return event{}
}

Is there a way to make the init function return multiple values, but we only need one return value to inject, for example:

func newmessage() (message,error ){
    //tbd
}

or

func NewMessage() (Message,Greeter) {
    //TBD
}

Correct answer

To declare a function with multiple return values, you need to put them in parentheses:

func NewMessage() (Message, error) {
    return Message(“TBD”), nil
}

EDIT: Your question (whether it is possible to return an error from the init function) will be answered in the next part of the wire tutorial - https://github.com/google/wire/ tree/main/_tutorial#making-changes -with line

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