[Bug libstdc++/95322] std::list | take | transform, expression does not work cbegin() == end()

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95322

--- Comment #19 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Patrick Palka
<ppa...@gcc.gnu.org>:

https://gcc.gnu.org/g:be5f22ebe964244223f178330a66b67d3f58334e

commit r10-9104-gbe5f22ebe964244223f178330a66b67d3f58334e
Author: Patrick Palka <ppa...@redhat.com>
Date:   Mon Oct 12 13:46:21 2020 -0400

    libstdc++: Apply proposed resolution for LWG 3449 [PR95322]

    Now that the frontend bug PR96805 is fixed, we can cleanly apply the
    proposed resolution for this issue.

    This slightly deviates from the proposed resolution by declaring _CI a
    member of take_view instead of take_view::_Sentinel, since it doesn't
    depend on anything within _Sentinel anymore.

    libstdc++-v3/ChangeLog:

            PR libstdc++/95322
            * include/std/ranges (take_view::_CI): Define this alias
            template as per LWG 3449 and remove ...
            (take_view::_Sentinel::_CI): ... this type alias.
            (take_view::_Sentinel::operator==): Adjust use of _CI
            accordingly.  Define a second overload that accepts an iterator
            of the opposite constness as per LWG 3449.
            (take_while_view::_Sentinel::operator==): Likewise.
            * testsuite/std/ranges/adaptors/95322.cc: Add tests for LWG 3449.

    (cherry picked from commit e066821b6f6b7332c7a67981f7b33c9ba0ccaee7)