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Iterators in Scheme?

From: Niols
Subject: Iterators in Scheme?
Date: Wed, 29 Jul 2020 12:39:27 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0


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!)


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?

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.

— Niols

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