[Dune] [#1024] Constructor call DiagonalMatrix<K, n>::DiagonalMatrix(FieldVector<K, 1>) ambiguous for n>2

[Dune]

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FS#1024 - Constructor call DiagonalMatrix<K,n>::DiagonalMatrix(FieldVector<K,1>) ambiguous for n>2
User who did this - Uli Sack (usack)

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OK, it seems not to be of much interest. Anyway, here's the SFINAE/enabled_if solution Carsten mentioned:

template<class C>
FieldVector (const DenseVector<typename Dune::enable_if<IsFieldVectorSizeCorrect<C,SIZE>::value,C>::type > & x)

It works for my test case. Also it wouldn't break implicit type conversion but at the same time render the static_assertion superfluous. A patch implementing this is attached.
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