Replace mdspan with upstream libc++ implementation

NVIDIA / cccl

CUDA Core Compute Libraries

Other

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Replace mdspan with upstream libc++ implementation #1185

Open jrhemstad opened 8 months ago

jrhemstad commented 8 months ago

### Tasks
- [ ] Backport libc++ implementation to C++14 (no submdspan())
- [ ] Implement `submdspan_extents` and write exhaustive tests for it
- [ ] Implement the various `submdspan_mapping` specializations for the different mappings
- [ ] Implement `submdspan` and write exhaustive tests for it
- [ ] Implement `layout_left_padded` and write exhaustive tests for it
- [ ] Implement `layout_right_padded` and write exhaustive tests for it

jrhemstad commented 8 months ago

@miscco to fill in the description and breakdown of tasks.

miscco commented 2 months ago

Update06/2024:

I have implemented and backported libc++ implementation and incorporated all tests into our test framework
I have implemented submdspan_extents without proper testing

@bernhardmgruber is taking that over on a "when time permits" basis