Re: [Lilypond-auto] Issue 4564 in lilypond: make Grob an abstract class

[lilypond]

Comment #2 on issue 4564 by address@hidden: make Grob an abstract  
class
https://code.google.com/p/lilypond/issues/detail?id=4564

I was merely hoping to allow something like this:

class Accidental_interface : public Grob { ... }

Accidental_interface *acc = get_interface<Accidental_interface> (grob);
if (acc) {
    acc->do_something ();
}

get_interface<T>(grob) would check that the grob implements the T interface  
and do a static downcast.

That way, methods in the interface can call grob methods via the implicit  
this pointer.  That fits with your hopes to convert scheme callbacks into  
member functions, doesn't it?

I thought this patch had merit on its own, since nobody is instantiating a  
base Grob anyway, but if you disagree, I can retract it and combine it with  
future changes.

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