[Bug libstdc++/108952] Regression in uses_allocator_construction_args for pair of rvalue references

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108952

--- Comment #5 from Jonathan Wakely  ---
(In reply to Peter Dimov from comment #4)
> An easy fix is to use `std::get<0>` instead of `.first`.

Yeah I tried that, but I think there's an additional change needed (or I messed
something up).

[Bug libstdc++/108952] Regression in uses_allocator_construction_args for pair of rvalue references

[pdimov at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108952

Peter Dimov  changed:

   What|Removed |Added

 CC||pdimov at gmail dot com

--- Comment #4 from Peter Dimov  ---
An easy fix is to use `std::get<0>` instead of `.first`.

[Bug libstdc++/108952] Regression in uses_allocator_construction_args for pair of rvalue references

[rs2740 at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108952

TC  changed:

   What|Removed |Added

 CC||rs2740 at gmail dot com

--- Comment #3 from TC  ---
https://cplusplus.github.io/LWG/issue3527

[Bug libstdc++/108952] Regression in uses_allocator_construction_args for pair of rvalue references

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108952

Jonathan Wakely  changed:

   What|Removed |Added

 Status|UNCONFIRMED |ASSIGNED
   Assignee|unassigned at gcc dot gnu.org  |redi at gcc dot gnu.org
 Ever confirmed|0   |1
   Last reconfirmed||2023-02-27

--- Comment #2 from Jonathan Wakely  ---
The problem is that std::move(pr).first always yields an lvalue, even if the
type of pr is pair.

I tried to simplify uses_allocator_construction_args to avoid indirection,
which I think is the source of this issue.

[Bug libstdc++/108952] Regression in uses_allocator_construction_args for pair of rvalue references

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108952

--- Comment #1 from Andrew Pinski  ---
Created attachment 54546
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54546=edit
testcase

Please next time also attach or put inline the testcase