[Dune] FS#848 - add index method to GeometryType

[Jö Fahlke]

[ Using the instead of flyspray since I can't log in ]

I like Andreas' proposal.  I modified it a little to provide two utility
classes:

  class LocalGeometryTypeIndex;
  class GlobalGeometryTypeIndex;

Each class provides two methods

  static std::size_t index(const GeometryType &gt);
  static std::size_t size(std::size_t dim);

In the implementation of GlobalGeometryTypeIndex I also use a method

  static std::size_t base(std::size_t dim);

which returns the first index for a given dimension.  This may be useful to
export in case someone stores stuff for all geometry types up to a certain
dimension in a vector and want to iterate over the subset of a particular
dimension in that vector only.

I left out TMP versions of size() (and base()) for now, they are always easy
to provide should someone need them.

The patch with the implementation is attached, please comment.

-- 
Sie können die Unversität jetzt ausschalten.
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