On Thu, 28 Nov 2002, Han-Wen Nienhuys wrote:
> ...
> > ! /* creats */ "Ligature_engraver",
>
> This fix is incorrect. Ligature_engraver does not follow protocol. It
> does
>
> Spanner *
> Ligature_engraver::create_ligature_spanner ()
> {
> return new Spanner (SCM_EOL);
> }
>
>
Ok, I am not that C++ guru. This method should actually be something that
in e.g. Java would be called an abstract method: Ligature_engraver just
defines the interface of this method, but leaves the implementation to its
subclasses (but it must be declared in Ligature_engraver itself, since it
is virtually envoked from the process_music() code of Ligature_engraver).
> If the engraver doesn't create anything (which is not the case, it
> seems), then the /*creats */ entry should simply be empty.
Most probably. But if I recall correctly, there was some problem with
acknowledge_grob() not being called in some cases. Hence, when putting
the creats entry empty, one should double check that
http://lilypond.org/development/Documentation/user/out-www/lilypond/White-mensural-ligatures.html#White%20mensural%20ligatures
still shows ligatures (as the website of 1.7.8 currently does, while in
1.7.6, ligatures did not show).
Greetings,
Juergen
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