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* [Bug libstdc++/105505] New: P1951R1 (Default Arguments for pair's Forwarding Constructor) is unimplemented
@ 2022-05-06 14:48 ensadc at mailnesia dot com
2022-05-06 17:11 ` [Bug libstdc++/105505] " redi at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: ensadc at mailnesia dot com @ 2022-05-06 14:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105505
Bug ID: 105505
Summary: P1951R1 (Default Arguments for pair's Forwarding
Constructor) is unimplemented
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: ensadc at mailnesia dot com
CC: redi at gcc dot gnu.org
Target Milestone: ---
https://en.cppreference.com/w/cpp/compiler_support claims that P1951R1 (Default
Arguments for pair's Forwarding Constructor) is supported in GCC libstdc++ 12,
but it seems that libstdc++ 12 doesn't actually add default template arguments
for said forwarding constructor.
For example, the following still does not work with libstdc++ (but works with
latest libc++ and MSVC STL: https://godbolt.org/z/6oY3G77oT).
```
#include <utility>
struct MoveOnly {
MoveOnly();
MoveOnly(MoveOnly&&);
};
std::pair<int, MoveOnly> p{42, {}};
```
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug libstdc++/105505] P1951R1 (Default Arguments for pair's Forwarding Constructor) is unimplemented 2022-05-06 14:48 [Bug libstdc++/105505] New: P1951R1 (Default Arguments for pair's Forwarding Constructor) is unimplemented ensadc at mailnesia dot com @ 2022-05-06 17:11 ` redi at gcc dot gnu.org 2022-09-29 18:11 ` redi at gcc dot gnu.org ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: redi at gcc dot gnu.org @ 2022-05-06 17:11 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105505 Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2022-05-06 Ever confirmed|0 |1 --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- I thought I'd pushed that change but apparently not. I've fixed the cppreference page. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug libstdc++/105505] P1951R1 (Default Arguments for pair's Forwarding Constructor) is unimplemented 2022-05-06 14:48 [Bug libstdc++/105505] New: P1951R1 (Default Arguments for pair's Forwarding Constructor) is unimplemented ensadc at mailnesia dot com 2022-05-06 17:11 ` [Bug libstdc++/105505] " redi at gcc dot gnu.org @ 2022-09-29 18:11 ` redi at gcc dot gnu.org 2024-01-11 22:51 ` redi at gcc dot gnu.org ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: redi at gcc dot gnu.org @ 2022-09-29 18:11 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105505 Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug libstdc++/105505] P1951R1 (Default Arguments for pair's Forwarding Constructor) is unimplemented 2022-05-06 14:48 [Bug libstdc++/105505] New: P1951R1 (Default Arguments for pair's Forwarding Constructor) is unimplemented ensadc at mailnesia dot com 2022-05-06 17:11 ` [Bug libstdc++/105505] " redi at gcc dot gnu.org 2022-09-29 18:11 ` redi at gcc dot gnu.org @ 2024-01-11 22:51 ` redi at gcc dot gnu.org 2024-01-12 9:48 ` cvs-commit at gcc dot gnu.org 2024-01-12 20:39 ` redi at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: redi at gcc dot gnu.org @ 2024-01-11 22:51 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105505 Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |14.0 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug libstdc++/105505] P1951R1 (Default Arguments for pair's Forwarding Constructor) is unimplemented 2022-05-06 14:48 [Bug libstdc++/105505] New: P1951R1 (Default Arguments for pair's Forwarding Constructor) is unimplemented ensadc at mailnesia dot com ` (2 preceding siblings ...) 2024-01-11 22:51 ` redi at gcc dot gnu.org @ 2024-01-12 9:48 ` cvs-commit at gcc dot gnu.org 2024-01-12 20:39 ` redi at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2024-01-12 9:48 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105505 --- Comment #2 from GCC 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:35f8c661d67f53486f2f3e25887323476a7d0c2b commit r14-7173-g35f8c661d67f53486f2f3e25887323476a7d0c2b Author: Jonathan Wakely <jwakely@redhat.com> Date: Thu Jan 11 22:38:02 2024 +0000 libstdc++: Implement C++23 P1951R1 (Default Args for pair's Forwarding Ctor) [PR105505] This was approved for C++23 at he June 2021 virtual meeting. This allows more efficient construction of std::pair members when {} is used as a constructor argument. The perfect forwarding constructor can be used, so that the member variables are constructed from forwarded arguments instead of being copy constructed from temporaries. libstdc++-v3/ChangeLog: PR libstdc++/105505 * include/bits/stl_pair.h (pair::pair(U1&&, U2&&)) [C++23]: Add default template arguments, as per P1951R1. * testsuite/20_util/pair/cons/default_tmpl_args.cc: New test. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug libstdc++/105505] P1951R1 (Default Arguments for pair's Forwarding Constructor) is unimplemented 2022-05-06 14:48 [Bug libstdc++/105505] New: P1951R1 (Default Arguments for pair's Forwarding Constructor) is unimplemented ensadc at mailnesia dot com ` (3 preceding siblings ...) 2024-01-12 9:48 ` cvs-commit at gcc dot gnu.org @ 2024-01-12 20:39 ` redi at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: redi at gcc dot gnu.org @ 2024-01-12 20:39 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105505 Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED --- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> --- I really have pushed it now ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2024-01-12 20:39 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-05-06 14:48 [Bug libstdc++/105505] New: P1951R1 (Default Arguments for pair's Forwarding Constructor) is unimplemented ensadc at mailnesia dot com 2022-05-06 17:11 ` [Bug libstdc++/105505] " redi at gcc dot gnu.org 2022-09-29 18:11 ` redi at gcc dot gnu.org 2024-01-11 22:51 ` redi at gcc dot gnu.org 2024-01-12 9:48 ` cvs-commit at gcc dot gnu.org 2024-01-12 20:39 ` redi at gcc dot gnu.org
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