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# Open questions
<!-- vi: set ft=mkd ts=8 sw=2 et sts=2: -->
Feel free to put your wishes and questions into this file.
It would be nice to prefix your statements with your initials
or one more letter if needed.
* OS: How do I specialize code for a particular basis? For example, how can I write an
'interpolate' method only for BSPlineBasis objects?
## Development
## Function space basis interface
* Here is another point that needs future discussion:
I just added the first implementation of a basis of a DG space.
This one uses Lagrangian shape functions. I expect other DG spaces using
other shape functions to appear eventually. Here is the issue: Currently,
the LagrangeDGBasis has the shape function type hard-wired into the code.
Any implementation for a DG space using a different set of shape functions
will differ very little from it. Hence one may consider implementing
a single DGBasis, and making the shape functions a template parameter.
However, it is not clear what exactly this template parameter should be.
It cannot be a LocalFiniteElement, because that would force us to pick
a grid element type at compile time (you currently could not use the
VirtualLocalFiniteElement here, because the code does not properly set it up).
You cannot expect a factory here either, because then you cannot currently
hard-wire the element type if that is what you want.
I don't think this is a difficult issue, it just needs a bit of discussion.
## Function interface
### EntitySet interface
* CaG: It seems that the EntitySet concept and GridViewEntitySet are
candidates for dune-grid.
### GridFunction concept
* CaG: Should GridFunction export the grid type?
* CaG: If yes, should GridFunction store/export a pointer to the grid?
* CaG: While LocalFunction is defined in a grid-agnostig way with
local coordinates from a 'LocalContext'. In contrast to this
the naming of GridFunction is linked to Grids:
entitySet(), LocalContext=decltype(entitySet())::Element.
There seems to be no need for this and we could
simply rename this in a grid-agnostic way if someone
comes up with better names than LocalizableFunction,
localContextSet()
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