GtkD: How to respond to cell edit's?

[Johnson Jones via Digitalmars-d-learn]

On Friday, 18 August 2017 at 00:27:05 UTC, Johnson Jones wrote:
> I should also mention that when I use an ID to do what I 
> want(again, something I don't want to do), I also need to get 
> the column that was edited. This is because I'm using one 
> delegate for all the edits.
>
>
> auto cb = delegate(string index, string text, CellRendererText 
> r)
> {
>     // How to get the column of that we are editing? An index 
> would be fine.
>     writeln(index, " - ", text);
> };
>
> RT1.addOnEdited(cb);
> RT2.addOnEdited(cb);
> RT2.addOnEdited(cb);
>
> Looks like I might have to use separate edit handlers ;/
>
> I wonder if I can somehow template it so I can do something like
>
>
> RT1.addOnEdited(cb!1);
> RT2.addOnEdited(cb!2);
> RT2.addOnEdited(cb!3);
>
> without having to write a bunch of code to make it happen. 
> Maybe there is a library function that can help?

Obvious it is easy when you have ID's, but this is meant for the 
original case where I'm not using ID's.