[Dune-devel] convert `enum` to `static const int`

[Ansgar Burchardt]

On Wed, 2017-09-20 at 15:23 +0200, Jö Fahlke wrote:
> Oh, and: `static constexpr` (or `static const`) variables are lvalues, while
> enumerators were prvalues.  That means we need to define them (in addition to
> initializing them) without violating the ODR.  Otherwise expressions like
> `std::min(GridType::dimension, 2)` can produce linker errors.

Hmm, right.  And that would be quite annoying to do...

C++17's inline variables should fix that[1] and `static constexpr`
members would even be inline by default[2], but we can't require C++17
yet.

Ansgar

  [1] http://en.cppreference.com/w/cpp/language/static#Static_data_members
  [2] http://en.cppreference.com/w/cpp/language/inline
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