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from 49c4b732837 Revert "c++: Non-inline temploid friends should still be CO [...] new ead579d3c52 libstdc++: Implement submdspan and submdspan_mapping for la [...] new c1c5ada671d libstdc++: Implement submdspan_mapping for layout_right. [P [...]

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Summary of changes: libstdc++-v3/include/std/mdspan | 599 +++++++++++++++++++-- libstdc++-v3/src/c++23/std.cc.in | 2 +- .../23_containers/mdspan/submdspan/generic.cc | 71 +++ .../mdspan/submdspan/selections/left.cc | 9 + .../mdspan/submdspan/selections/right.cc | 9 + .../mdspan/submdspan/selections/testcases.h | 360 +++++++++++++ .../mdspan/submdspan/submdspan_mapping.cc | 142 +++++ .../mdspan/submdspan/submdspan_neg.cc | 113 ++++ 8 files changed, 1247 insertions(+), 58 deletions(-) create mode 100644 libstdc++-v3/testsuite/23_containers/mdspan/submdspan/generic.cc create mode 100644 libstdc++-v3/testsuite/23_containers/mdspan/submdspan/selection [...] create mode 100644 libstdc++-v3/testsuite/23_containers/mdspan/submdspan/selection [...] create mode 100644 libstdc++-v3/testsuite/23_containers/mdspan/submdspan/selection [...] create mode 100644 libstdc++-v3/testsuite/23_containers/mdspan/submdspan/submdspan [...] create mode 100644 libstdc++-v3/testsuite/23_containers/mdspan/submdspan/submdspan_neg.cc