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Implements submdspan for layout_left_padded as described in P3663. PR libstdc++/110352 libstdc++-v3/ChangeLog: * include/std/mdspan (__mdspan::__is_padded_mapping): Define. (__mdspan::_SubMdspanMapping): Add _Padded template parameter. (__mdspan::_SubMdspanMapping<_LayoutSide::__left, true>): Define. (__mdspan::__submdspan_mapping_impl): Updated _Trait alias. (layout_left_padded::submdspan_mapping): New friend method. * testsuite/23_containers/mdspan/layout_traits.h (LayoutTraits::layout_same_padded): New template type alias. * testsuite/23_containers/mdspan/submdspan/selections/left_padded.cc: Instantiate tests for layout_left_padded. * testsuite/23_containers/mdspan/submdspan/submdspan_mapping.cc: Ditto. Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com> Signed-off-by: Luc Grosheintz <luc.grosheintz@gmail.com>
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.