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Re: Iterators in Scheme?

From: David Kastrup
Subject: Re: Iterators in Scheme?
Date: Wed, 29 Jul 2020 15:16:28 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Niols <> writes:

> Hello,
> I am trying to dive a bit into the way LilyPond works, and I was
> wondering about iterators. The documentation contains a page named 
> “iterator tutorial” [1] but this is only a placeholder for a future
> tutorial. (I very much understand that it is painful to write such 
> tutorials and I am not here to complain of anything!)
> [1]
> The only thing the page actually says is “Iterators are routines
> written in C++ that process music expressions and sent the music
> events to the appropriate engravers and/or performers.”
> Must I understand that it is not possible to write iterators in Scheme
> and that they have to be written in C++?


> Must I then understand that, if I wanted to write iterators for a
> personal use, I would have to recompile LilyPond myself?

Yes, or reuse one of the existing ones.  Some are comparatively generic.

> If it is actually possible to write an iterator in Scheme, would
> anyone have an example to show me or a link to give me?
> Thank you so much in advance.

What do you want to achieve?

David Kastrup

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