[erlang-questions] generators/iterators

Damien Morton <>
Mon Jun 18 00:23:20 CEST 2007


Umm, I just realised that a stream/generator would need to be a function 
that returns a function that can be called repeatedly to generate the 
sequence, probably terminating with a well-known sequence terminating 
exception.

This would solve the problem of the generators needing to be reset 
during nested loops in a comprehension.

> Hmm,
>
> Coming from a strong Python and C# background, I find myself missing 
> generators/iterators.
>
> For example, when using list comprehension syntax, I find myself wanting 
> to use a function as a generator
>
> items(X) ->
>     fun() -> next_item(X) end.
>
> [Y*Y || Y <- items(X)]
>
> Would it be simple to have erlang recognise a function as a generator?
>
> Sorry if the terminology is getting mixed up here.
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