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From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/95322] std::list | take | transform, expression does
 not work cbegin() == end()
Date: Tue, 26 May 2020 13:54:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95322

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ppalka at gcc dot gnu.org

--- Comment #4 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Attempting to work around this by using views::common like so

       auto view3 =3D view1 | std::views::transform([] (int i) { return i +=
 3;})
| std::views::common;
       /* ... */
       std::ranges::cbegin(view3) =3D=3D std::ranges::end(view3);

instead results is a compilation failure in stl_iterator.h:

/home/patrick/code/gcc/libstdc++-v3/include/bits/stl_iterator.h:1772:27: er=
ror:
=E2=80=98_Common_iter_proxy=E2=80=99 was not declared in this scope; did yo=
u mean
=E2=80=98std::__detail::_Common_iter_proxy=E2=80=99?         1772 |  return
_Common_iter_proxy(*_M_it);=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20
      |         ~~~~~~~~~~~~~~~~~~^~~~~~~~=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
                                    |         std::__detail::_Common_iter_p=
roxy
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20
/home/patrick/code/gcc/libstdc++-v3/include/bits/stl_iterator.h:1572:13: no=
te:
=E2=80=98std::__detail::_Common_iter_proxy=E2=80=99 declared here=