[Bug libstdc++/104032] New: Cannot move-assign a spanstream

[Bug libstdc++/104032] New: Cannot move-assign a spanstream

[ensadc at mailnesia dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104032

            Bug ID: 104032
           Summary: Cannot move-assign a spanstream
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ensadc at mailnesia dot com
  Target Milestone: ---

https://godbolt.org/z/GxdYrYYrj

====
#include <spanstream>

int main() {
    std::ispanstream a(""), b("");
    a = std::move(b);
}

====
In file included from <source>:1:
/opt/compiler-explorer/gcc-trunk-20220114/include/c++/12.0.0/spanstream: In
instantiation of 'std::basic_spanbuf<_CharT, _Traits>&
std::basic_spanbuf<_CharT, _Traits>::operator=(std::basic_spanbuf<_CharT,
_Traits>&&) [with _CharT = char; _Traits = std::char_traits<char>]':
/opt/compiler-explorer/gcc-trunk-20220114/include/c++/12.0.0/spanstream:258:24:
  required from here
/opt/compiler-explorer/gcc-trunk-20220114/include/c++/12.0.0/spanstream:89:7:
error: base operand of '->' has non-pointer type 'std::basic_spanbuf<char>'
   89 |       basic_spanbuf(std::move(__rhs))->swap(*this);
      |       ^~~~~~~~~~~~~

[Bug libstdc++/104032] Cannot move-assign a spanstream

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104032

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2022-01-15
             Status|UNCONFIRMED                 |ASSIGNED
   Target Milestone|---                         |12.0
           Assignee|unassigned at gcc dot gnu.org      |redi at gcc dot gnu.org
     Ever confirmed|0                           |1

[Bug libstdc++/104032] Cannot move-assign a spanstream

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104032

--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:51631875a2fa0af62ebda7484ac48368e1805dff

commit r12-6829-g51631875a2fa0af62ebda7484ac48368e1805dff
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Sun Jan 23 21:55:57 2022 +0000

    libstdc++: Fix std::spanstream move assignment [PR104032]

    libstdc++-v3/ChangeLog:

            PR libstdc++/104032
            * include/std/spanstream (basic_spanbuf(basic_spanbuf&&)): Use
            mem-initializer for _M_buf.
            (basic_spanbuf::Operator=(basic_spanbuf&&)): Fix ill-formed
            member access.
            * testsuite/27_io/spanstream/2.cc: New test.

[Bug libstdc++/104032] Cannot move-assign a spanstream

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104032

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed, thanks for the report.