Make Field(Matrix|Vector) constructor from initializer_list constexpr

This allos to do

constexpr auto M = Dune::FieldMatrix<double,2,2>{ {1,2}, {3,4}};

Notive that copy_n is not constexpr. Hence we implement this with a manual for loop.

There's many more methods that could be constexpr. But for now, having this would be nice to at least being able to create a compile-time constant FieldMatrix.

assigned to @simon.praetorius

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• 6f3f0d76 - Make Field(Matrix|Vector) constructor from initializer_list constexpr

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Nice! Probably we could make most methods constexpr, but this is for another time.

Do you want to add a changelog entry? Give me a sign when it is ready to be merged.

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• aa1526b9 - [doc] Add changelog entry about constexpr constructors of FieldMatrix and FieldVector

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merged

mentioned in commit 2900961f