[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 - Oliver Sander (sander)

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I thought that adding an assignment operator fixed the warning?  I still can't believe there isn't a better way to fix this than a full specialization.

The reason that I didn't implement inheritance from std::array after all is the following.  Apparently, some implementations of std::array state explicit alignment requirements that
make the array consume more memory than strictly necessary.  Since we routinely use large arrays of FieldVector in memory-critical circumstances, such a waste of memory seemed intolerable.  I didn't actually test this, though.  Someone may want to verify my claims before we decide this.


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