Re: [Lilypond-auto] Issue 4022 in lilypond: Patch: Allow specifying different alignment for grob and its parent

[lilypond]

Comment #37 on issue 4022 by address@hidden: Patch: Allow specifying different  
alignment for grob and its parent
http://code.google.com/p/lilypond/issues/detail?id=4022

Regarding #35: #f basically means "explicitly off", while '() does not have  
as explicit a meaning.  Calls to ly:grob-property and ly:context-property  
cannot distinguish a property that has never been set (and has no default)  
from a property that is explicitly set to #'() in some context: that  
difference is basically only visible to the C++ layer.  However, setting a  
property to #'() _does_ override settings in outer contexts.

As such, #'() to mean "take default from somewhere else" is sort-of a  
natural choice.

LilyPond uses '() in a number of situations where Scheme would likely  
consider #f more suitable.  In Lisp, both are the same and called NIL.   
Maybe LilyPond's use of #'() is a bit influenced by the original LilyPond  
authors knowing Lisp.

At any rate, that choice fits usage of #'() elsewhere reasonably well.

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