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Adds submdspan_mapping for layout_right as described in P3663. PR libstdc++/110352 libstdc++-v3/ChangeLog: * include/std/mdspan (__mdspan::_SubMdspanMapping<_LayoutSide::__right>): Define. (layout_right::mapping::submdspan_mapping): New friend function. * testsuite/23_containers/mdspan/submdspan/selections/right.cc: Instantiate tests for layout_right. * testsuite/23_containers/mdspan/submdspan/submdspan_mapping.cc: Ditto. * testsuite/23_containers/mdspan/submdspan/submdspan_neg.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.