[Aldor-l] empty Generator?

[Ralf Hemmecke]

> The only way I can imagine a work around would be do the partialNext! as 
> below, then rebuild the original generator (perhaps using the Generator:
>         concat: List(%) -> %
> function)
> 
> a bit dirty I know! but might be some help?

Well if I just want to implement "empty?(g)" (since there is no such 
function) using partialNext! then I would have to step the generator g. 
That is a destructive operation on g. Then I would have to rebuild the 
old g somehow without modifying the memory address of g (since there 
might be other places where g is used). Generator just doesn't have that 
functionality (not that I know of) to do such a destructive rebuild of 
the orginal g, i.e. to do a push back.

I do not desparately want "empty?" to exist, but perhaps it is already 
there an the compiler/library just doesn't give access to it. I simply 
don't know. But I thought that perhaps someone with more knowledge of 
the compiler could tell me.

Ralf