How do I declare a signal?

[nii236]

I was just following the docs I saw in the code comment for Signal.Solo:

// Solo value that can be signaled, add this as a field inside a [classdb.Extension]
// to register it as a signal.

My code below.

type World struct {
	classdb.Extension[World, Node2D.Instance] `gd:"NXRWorld"`
	Model                                     *model.Model
	RequestLevel                              Signal.Solo[int] `gd:"request_level"`
	NavigationMesh                            NavigationMesh.Instance
}

Not implemented error:

panic: NewSignalProxy: not implemented

goroutine 17 [running, locked to thread]:
graphics.gd/internal.NewSignalProxy()
        /Users/nii236/go/pkg/mod/[email protected]/internal/signals.go:57 +0x2c
...

Are signals not supported yet?

To avoid the XY problem, I'm trying to call a function in a sibling node to my Go node, then receive the function's return value in another signal (trying to keep my Go bits as decoupled as possible)

[Splizard]

If you just need to Emit values from Go to the engine/GDScript, you can use Go send-only channels for signals that send a single value, this has an example that works

https://github.com/grow-graphics/eg/blob/master/1d/signals/signals.go

package main

import (
	"time"

	"graphics.gd/classdb"
	"graphics.gd/startup"
	"graphics.gd/variant/Object"
	"graphics.gd/variant/Signal"
)

type Signals struct {
	classdb.Extension[Signals, Object.Instance]

	Something chan<- struct{} `gd:"something"`

	Generic Signal.Solo[int] `gd:"generic"`
}

func (s *Signals) DoSomething() {
	go func() {
		time.Sleep(time.Second)
		s.Something <- struct{}{}
		s.Generic.Emit(22)
	}()
}

func main() {
	classdb.Register[Signals]()
	startup.Scene()
}

The Signal package types are primarily for working with the lower level signal functions, or to support Go consumers. They still need to be hooked up with class registration so that they work as designed. I'll take a look at this over the weekend.

[Splizard]

@nii236 have pushed a fix for the generic Signal types. Your example should work now!

[nii236]

You guys are so productive!