Le 10/07/2022 à 14:32, Valentin Petzel a écrit :
Hello Werner,
the problem here is not really ly:context-property, but the C-implementation
Context::internal_get_property, which uses SCM_EOL as default value. So
Lilypond’s guile interface cannot know if a NULL is actually set or if the
contex
>> I have a use case where I want to say
>>
>> ```
>> \set SYM = #'()
>> ```
>>
>> i.e., I explicitly want to override the default DEF with an empty
>> list. How can I do that?
>
> As a user, if the code is written that way, you have no proper
> solution. Yes, that’s a bit sad. (If the property
> the problem here is not really ly:context-property, but the
> C-implementation Context::internal_get_property, which uses SCM_EOL
> as default value. [...]
Thanks for the explanation!
> #(define (context-has-defined? context sym)
>(eq? (ly:context-property-where-defined context sym) conte
Hello Werner,
the problem here is not really ly:context-property, but the C-implementation
Context::internal_get_property, which uses SCM_EOL as default value. So
Lilypond’s guile interface cannot know if a NULL is actually set or if the
context property is not set. It would be possible to chec
> Le 10 juil. 2022 à 13:47, Werner LEMBERG a écrit :
>
>
> The documentation of `ly:context-property` is as follows.
>
> -- Function: ly:context-property context sym def
>
> Return the value for property SYM in CONTEXT. If DEF is given,
> and property value is ‘'()’, return DEF.
The documentation of `ly:context-property` is as follows.
-- Function: ly:context-property context sym def
Return the value for property SYM in CONTEXT. If DEF is given,
and property value is ‘'()’, return DEF.
I have a use case where I want to say
```
\set SYM = #'()
```
i.e., I
