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

[lilypond]

Comment #6 on issue 4564 by address@hidden: make Grob an abstract class
https://code.google.com/p/lilypond/issues/detail?id=4564

In as far as the patch tries to create a type relation between derived  
classes that is not intended to even reflect any sensible object relation,  
I do object to this patch in itself.

I cannot claim an absolute ban over such pointer abuse since the classes  
defined in lily/include/small-smobs.hh similarly abuse a this-pointer and  
member functions for carrying information unrelated to actually existing  
objects.  However, in that case this is a trade-off allowing for easy  
conversion between SCM objects with and without extra allocated memory and  
thus is connected to actual matters of efficiency.

I don't see any comparable tradeoff here that would serve to justify the  
abuse of the type lattice.

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