FieldVector & FieldMatrix -- implicit conversion

Hi there,

the following two constructors are causing trouble for me. Not being "explicit" they lead to implicit type conversion. The concrete example is that a Fieldvector<SCALAR, DIM> can be implicitly converted to a FieldVector<FieldMatrix<SCALAR, D1, D2>, DIM>. The two constructors implementing this bug/feature are

• dune/common/fmatrix.hh, around line 100
• dune/common/fvector.hh, around line 145

Changing the fmatrix copy-constructor does not seem to be a good idea. But if the FieldVector constructor could be made "explicit", that would be great.

Still, there may be side-effects when changing to "explicit" Dunno.

Cheers,

Claus