[Dune-devel] replace `enum { something = 42 }; ` with `constexpr static int something = 42; `

[Christoph Grüninger]

Hi Ansgar,
I like you proposal! I think you are referring to this, which should be 
solved in C++17:
https://stackoverflow.com/questions/37259807/static-constexpr-int-vs-old-fashioned-enum-when-and-why

Bye
Christoph

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