On 11 July 2010 15:52, Arno Waschk <hamama...@gmx.de> wrote:
> How do i use this in a c line?
Look up the procedure:
SCM proc = ly_lily_module_constant ("map-alist-keys");
Call the procedure, using scm_call_2:
SCM result = scm_call_2 (proc, arg1, arg2);
>> Your question isn't really about converting from scheme to c++, it's
>> really
>> about getting all of the keys and/or properties from an alist. That's not
>> built into scheme.
>
> No, it is about easily accessing information buried into some scheme
> structures by some little c code.
> As long this is not possible, this information is next to encrypted for me.
Why do you need to do this in C/C++ though?
If you're running a .ly file, this information's easily available via
ly:grob-alist-chain:
\relative c' {
\override Staff.KeySignature #'after-line-breaking =
#(lambda (grob)
(for-each (lambda (lst title)
(display (format #f "~a:\n" title))
(for-each (lambda (entry)
(display (format #f " ~a\n" (car entry))))
lst)
(newline))
(ly:grob-alist-chain grob '()) '("mutable" "immutable")))
\key a \major
a1
}
Cheers,
Neil
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