[dune-pdelab] Write own CompositeGridFunction

[Christoph Grüninger]

Dear PDELab,
when I have several scalar unknown, I use a boundary function for every
unknown and combine them using CompositeGridFunction. Now I want to
write a boundary function which return the value for several scalar
values. I did not find an example and the source CompositeGridFunction
is not very helpful.
I know for PowerGridFunction I can return a FieldVector. For composites
I expect it to not work.
Or should I just stick with CompositeGridFunction?

I am using PDELab 2.0 and TypeTree 2.3.

Bye
Christoph

-- 
The method has been developed for use on a high-speed electronic
computer and would be impractical for hand-solution purposes.
                                           [Harlow & Welch 1965]

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