MDSpan issues expose by Kokkos View refactor

kokkos / mdspan

Reference implementation of mdspan targeting C++23

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MDSpan issues expose by Kokkos View refactor #358

Closed crtrott closed 2 months ago

crtrott commented 2 months ago

fixes and issue (and adds test) where layout_left_paddded <-> layout_right_padded conversion didn't work if the extents_type are not convertible
uses correct constraint for pair like submdspan slices
fixes a few missing things for CUDA and nvc++ compiler

crtrott commented 2 months ago

As discussed elsewhere: complex is one of the named types for which this is supposed to work based on the definition of index-pair-like I see no reason to not include it here in the back port. Every standard approved version of submdspan will take complex as slice argument, and so I don't see a good reason to exclude it from this back port to C++17.