[Dune] [#438] Let FieldVector inherit from Dune::array

[Dune]

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The following task has a new comment added:

FS#438 - Let FieldVector inherit from Dune::array
User who did this - Martin Nolte (nolte)

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The warning is not fixed. With me, it happens whenever genericreferenceelements.hh is included (and maybe used).

You're right about the alignment problem. The size FieldVector< double, n> should be exactly
n doubles (except for n=0), since sometimes a double[ n ] is casted into a FieldVector.

Anyway, an implementation of array class (I don't care for the name) with exactly the properties of a FieldVector (except for its interpretation as a mathematical vector, of course) is a very desirable thing. In some situations, the FieldVector is already misused as such an array and I don't this this is a good idea.

I std::array does not provide the properties we want, I suggest to have a special Dune::Array or Dune::FixedArray that implements exactly this behaviour. Personally, I prefer this approach to using TR1 stuff anyway, since you never know if it is properly (i.e., in the way we expect it to be) implemented...
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