change object class

[Vitaliy Fadeev]

On Friday, 22 September 2023 at 19:50:17 UTC, Christian Köstlin 
wrote:
> another option could be to model your own VTable in a struct 
> like this:
> https://run.dlang.io/is/3LTjP5
>
> Kind regards,
> Christian

Thank, Christian !
True nice tasty solution with ```VTable```!
And further... the project is growing.
```
void Draw()
{
   DrawBG();
   DrawFG();
}
```

And we want use ```DrawBG()``` code  from ```initial``` in other 
states, like ```Selected```.

How to use some functions from ```initial``` via ```VTable``` ?

I see solution in ```classes``` and methods with ```override``` 
keyword.

```VTable``` does the same thing as ```__vptr``` ?