[Bug libstdc++/51960] New: Missing move-assignment operator in raw_storage_iterator

[Bug libstdc++/51960] New: Missing move-assignment operator in raw_storage_iterator

[valyala at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51960

             Bug #: 51960
           Summary: Missing move-assignment operator in
                    raw_storage_iterator
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: valyala@gmail.com


It's interesting why raw_storage_iterator (
http://gcc.gnu.org/viewcvs/trunk/libstdc%2B%2B-v3/include/bits/stl_raw_storage_iter.h?revision=169421&view=markup
) doesn't provide move-assignment operator? Such an operator would allow moving
items to a raw memory instead of copying them. In this case the
raw_storage_iterator could be properly used with std::move()-like algorithms:

template <typename InputIterator, typename T>
void move_to_raw_buffer(InputIterator first, InputIterator last, T *raw_buffer)
{
  std::move(first, last, std::raw_storage_iterator<T *, T>(raw_buffer));
}

Currently this results in items' copying instead of expected items' movement
due to the lack of move-assignment operator in the raw_storage_iterator
implementation.

[Bug libstdc++/51960] Missing move-assignment operator in raw_storage_iterator

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51960

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-01-23
     Ever Confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-01-23 11:29:36 UTC ---
I'll check if this has been suggested before and if not will raise it with the
committee.

[Bug libstdc++/51960] Missing move-assignment operator in raw_storage_iterator

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51960

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-03-22 10:49:08 UTC ---
Shall we suspend this? Do we have a DR #?

[Bug libstdc++/51960] [DR 2127] Missing move-assignment operator in raw_storage_iterator

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51960

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |SUSPENDED
            Summary|Missing move-assignment     |[DR 2127] Missing
                   |operator in                 |move-assignment operator in
                   |raw_storage_iterator        |raw_storage_iterator

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-03-22 11:08:06 UTC ---
Yes, http://cplusplus.github.com/LWG/lwg-active.html#2127

No consensus for change so far.