[cleanup] Simplify quadrature rule singleton

All compilers should now support lambdas and structured bindings

added 1 commit

• 67f8aafe - [cleanup] Simplify quadrature rule singleton

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I like the simplifications. But aren't they interface changes? Should we keep the old version for one more Dune version and deprecate them?

there are no interface changes. All the functions are private / implementation details.

Looks good to me. I will run a system test and then merge.

https://gitlab.dune-project.org/infrastructure/dune-nightly-test/-/pipelines/45632

assigned to @simon.praetorius

mentioned in commit 9a17e77b

merged

mentioned in merge request !174