> > > Are these standard C++?  What are they?
> > 
> > No, sorry.  We're using all kinds of GNU extensions.
> 
> Well, the specific construct, namely templates, is standard C++ and is
> available on all newer compilers, but as Jan said, Lilypond uses some
> other Gnu specific features.

They are not templates but min and max operators.  They're not standard
C++. 

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