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Re: Some engraver brainstorming
From: |
David Kastrup |
Subject: |
Re: Some engraver brainstorming |
Date: |
Sun, 09 May 2010 09:02:04 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) |
Han-Wen Nienhuys <address@hidden> writes:
> The lifetime of Threads (or whatever you call them) is tricky. Consider
>
>
> <c( address@hidden( g>
> % *
> % ..stuff..
> %
> <address@hidden) f)>
> % **
>
> How would LilyPond know that the @1 thread context must stay alive at
> the point marked %* ? The iterator for the E note would be pointing at
> the @1 Thread, but something else must copy the reference so it doesnt
> die.
As long as a Thread has unfinished business, it would stay around.
Alternatively, they stay alive until their voice dies.
It is probably a bad idea to have Threads (or whatever) have their own
property sets since we already have enough of a mess figuring out where
\set xxx.yyy
goes. If they are not full contexts with properties and so on, but
basically just an event filter with on-demand engraver instances, maybe
most of the complications don't arrive in practice.
> Suppose you somehow save the reference to @1. How does lilypond know
> the context should die at %** ? If it does not, you'll risk
> accumulating them until the end of the piece, making things slow down.
End of voice, or no pending business, I'd say. Of course, when you
forget to close a spanning engraver, there will be pending business
until end of voice. And then we'll get the error/warning message.
I don't see this as problematic, but of course I have had no previous
exposure to the last attempt.
--
David Kastrup
- Re: Some engraver brainstorming, (continued)
- Re: Some engraver brainstorming, Marc Hohl, 2010/05/08
- Re: Some engraver brainstorming (was: Following voices in chords?), Kieren MacMillan, 2010/05/08
- Re: Some engraver brainstorming, Werner LEMBERG, 2010/05/08
- Re: Some engraver brainstorming, David Kastrup, 2010/05/08
- Re: Some engraver brainstorming, Han-Wen Nienhuys, 2010/05/08
- Re: Some engraver brainstorming, David Kastrup, 2010/05/08
- Re: Some engraver brainstorming, Werner LEMBERG, 2010/05/08
- Re: Some engraver brainstorming, Han-Wen Nienhuys, 2010/05/08
- Re: Some engraver brainstorming, Han-Wen Nienhuys, 2010/05/08
- Re: Some engraver brainstorming, David Kastrup, 2010/05/09
- Re: Some engraver brainstorming,
David Kastrup <=
- Re: Some engraver brainstorming, David Kastrup, 2010/05/08
- Re: Some engraver brainstorming, Francisco Vila, 2010/05/08
- Re: Some engraver brainstorming, Reinhold Kainhofer, 2010/05/08
- Re: Some engraver brainstorming, Carl Sorensen, 2010/05/08
- Re: Some engraver brainstorming, David Kastrup, 2010/05/09
- Re: Some engraver brainstorming, David Kastrup, 2010/05/10
- Re: Some engraver brainstorming, Carl Sorensen, 2010/05/10
- Re: Some engraver brainstorming, David Kastrup, 2010/05/10
- Re: Following voices in chords?, Graham Percival, 2010/05/07
- Re: Following voices in chords?, Carl Sorensen, 2010/05/07