[Dune] [#454] cast from GenericIterator to const GenericIterator broken

[Dune]

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The following task has a new comment added:

FS#454 - cast from GenericIterator to const GenericIterator broken
User who did this - Christian Engwer (christi)

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I found out what the problem is, but I'm not sure whether this is a bug in g++ or what...

I assumed:
  int x;
  typedef int& rint;
  const rint cri1 = x; // assumption cri1 is of type const int &, but this is wrong.
  remove_const<const int &> ri1 = x; // assumption ri1 is of type int &, but this is also wrong.

So neither can I preceed a typedef foo& with a const, nor can I remove the const of reference.

It is easy to implemente typetraits that do this job, I'm just not sure what the correct approach would be.
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