Improve formatting of concepts

[bernhardmgruber]

The current style config makes concept definitions quite verbose:

Here is a LLAMA concept using my private .clang-format:

    template <typename M>
    concept Mapping = requires(M m) {
        typename M::ArrayExtents;
        typename M::ArrayIndex;
        typename M::RecordDim;
        { m.extents() } -> std::same_as<typename M::ArrayExtents>;
        { +M::blobCount } -> std::same_as<std::size_t>;
        std::integral_constant<std::size_t, M::blobCount>{}; // validates constexpr-ness
        { m.blobSize(typename M::ArrayExtents::value_type{}) } -> std::same_as<typename M::ArrayExtents::value_type>;
    };

And now formatted with the CRP .clang-format:

    template<typename M>
    concept Mapping = requires(M m) {
                          typename M::ArrayExtents;
                          typename M::ArrayIndex;
                          typename M::RecordDim;
                          {
                              m.extents()
                              } -> std::same_as<typename M::ArrayExtents>;
                          {
                              +M::blobCount
                              } -> std::same_as<std::size_t>;
                          std::integral_constant<std::size_t, M::blobCount>{}; // validates constexpr-ness
                          {
                              m.blobSize(typename M::ArrayExtents::value_type{})
                              } -> std::same_as<typename M::ArrayExtents::value_type>;
                      };

Please consider improving the status-quo.

[psychocoderHPC]

Which config entry is the reason for the issue. I assume it is an alignment option and you use in llama only indentions.

[bernhardmgruber]

It is caused by BreakBeforeBraces: Allman. If I replace it with:

BreakBeforeBraces: Custom
BraceWrapping:
  AfterFunction:   false

the formattign is much better. Obviously, this also changes the formatting of ordinary functions as well.

[j-stephan]

This was a LLVM bug that was recently fixed. I suggest to wait until it appears in a clang-format release.

[SimeonEhrig]

The PR was merge in July 2022 and Clang 15 was released in September 2022. I think we need to update to clang-format-15.