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We implement this paper as a DR against C++20 (as do MSVC and libc++). PR libstdc++/120446 libstdc++-v3/ChangeLog: * include/bits/version.def (common_reference): New. * include/bits/version.h: Regenerate. * include/std/type_traits (__glibcxx_want_common_reference): Define. (__common_reference_impl<T1, T2, 1>): Add pointer convertibility constraints as per P2655R3. * testsuite/20_util/common_reference/p2655r3.cc: New test. Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com> Reviewed-by: Jonathan Wakely <jwakely@redhat.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.