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Author SHA1 Message Date
Christian Trott
0f4d7d81c9 [libc++][mdspan] Fix layout_left::stride(r) 
It was using the stride calculation of layout_right.

Reviewed By: philnik

Differential Revision: https://reviews.llvm.org/D157065
 2023-08-04 09:40:27 -06:00
Christian Trott
b4ff893877 [libc++][mdspan] Implement layout_left 
This commit implements layout_left in support of C++23 mdspan
(https://wg21.link/p0009). layout_left is a layout mapping policy
whose index mapping corresponds to the memory layout of Fortran arrays.
Thus the left most index has stride-1 access, and the right most index
is associated with the largest stride.

Co-authored-by: Damien L-G <dalg24@gmail.com>

Differential Revision: https://reviews.llvm.org/D153783
 2023-06-29 14:01:08 -06:00