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This commit adds the right padded layout as described in N5014, with LWG4372 (dynamic padding value) and LWG4314 (move in operator()). PR libstdc++/110352 libstdc++-v3/ChangeLog: * include/std/mdspan (_RightPaddedIndices): Traits for right padded layouts. (layout_right::mapping::mapping) New overload for right padded layouts. (layout_right_padded): Add implementation. * src/c++23/std.cc.in (layout_right_padded): Add. * testsuite/23_containers/mdspan/layouts/ctors.cc: Update test for right padded layouts. * testsuite/23_containers/mdspan/layouts/empty.cc: Ditto. * testsuite/23_containers/mdspan/layouts/mapping.cc: Ditto. * testsuite/23_containers/mdspan/layouts/padded.cc: Ditto. * testsuite/23_containers/mdspan/layouts/padded_neg.cc: Ditto. * testsuite/23_containers/mdspan/layouts/padded_traits.h: Ditto. Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com> Signed-off-by: Luc Grosheintz <luc.grosheintz@gmail.com>
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