[hybrid] Make evaluateFoldExpression constexpr to enable use in constexpr functions

added feature label

added 348 commits

• 8ecfec5f...bc1f7a91 - 347 commits from branch master
• a7d1aa0a - [hybrid] Make evaluateFoldExpression constexpr to enable use in constexpr functions

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mentioned in merge request dune-istl!375 (merged)

assigned to @christi

mentioned in merge request !795 (merged)

I guess you wanted to assign this MR to @carsten.graeser !?

I don't know. Would be nice if someone could look at this. Shouldn't be problematic. It need it for the blockLevel proposal in dune-istl!375 (merged). And in general it seems strange that this is the only function (except !795 (merged)) in hybridutilities that is not usable at compile time.

Looks uncontroversial. I'll merge...

merged

mentioned in commit 8f5d4112

Was fine with me.

mentioned in commit dune-istl@ea9f0c4c