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* [Bug libstdc++/105375] New: std::packaged_task has no deduction guide.
@ 2022-04-25 12:49 raldone01 at gmail dot com
2022-04-25 12:49 ` [Bug libstdc++/105375] " raldone01 at gmail dot com
` (9 more replies)
0 siblings, 10 replies; 11+ messages in thread
From: raldone01 at gmail dot com @ 2022-04-25 12:49 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105375
Bug ID: 105375
Summary: std::packaged_task has no deduction guide.
Product: gcc
Version: 11.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: raldone01 at gmail dot com
Target Milestone: ---
According to cppreference
https://en.cppreference.com/w/cpp/thread/packaged_task/deduction_guides
std::packaged_task should have a deduction guide.
The example listed on their page does not compile.
gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/11.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++,d --enable-bootstrap
--prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/
--with-linker-hash-style=gnu --with-system-zlib --enable-__cxa_atexit
--enable-cet=auto --enable-checking=release --enable-clocale=gnu
--enable-default-pie --enable-default-ssp --enable-gnu-indirect-function
--enable-gnu-unique-object --enable-linker-build-id --enable-lto
--enable-multilib --enable-plugin --enable-shared --enable-threads=posix
--disable-libssp --disable-libstdcxx-pch --disable-werror
--with-build-config=bootstrap-lto --enable-link-serialization=1
gdc_include_dir=/usr/include/dlang/gdc
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 11.2.0 (GCC)
System type: Ubuntu WSL
Command line: c++ -Wall -Wextra -g -std=gnu++20 -o lin.obj -c main.cpp
Expected behavior: The snipped from cppreference compiles.
Actual behavior: The deduction guide for packaged_task is missing?
int func(double) { return 0; }
int main() {
std::packaged_task f{func}; // deduces packaged_task<int(double)>
int i = 5;
std::packaged_task g = [&](double) { return i; }; // deduces
packaged_task<int(double)>
}
As std::function has deduction guides shouldn't std::packaged_task have some
too?
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug libstdc++/105375] std::packaged_task has no deduction guide.
2022-04-25 12:49 [Bug libstdc++/105375] New: std::packaged_task has no deduction guide raldone01 at gmail dot com
@ 2022-04-25 12:49 ` raldone01 at gmail dot com
2022-04-25 12:51 ` raldone01 at gmail dot com
` (8 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: raldone01 at gmail dot com @ 2022-04-25 12:49 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105375
--- Comment #1 from raldone01 <raldone01 at gmail dot com> ---
Created attachment 52866
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52866&action=edit
main.cpp
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug libstdc++/105375] std::packaged_task has no deduction guide.
2022-04-25 12:49 [Bug libstdc++/105375] New: std::packaged_task has no deduction guide raldone01 at gmail dot com
2022-04-25 12:49 ` [Bug libstdc++/105375] " raldone01 at gmail dot com
@ 2022-04-25 12:51 ` raldone01 at gmail dot com
2022-04-25 13:12 ` redi at gcc dot gnu.org
` (7 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: raldone01 at gmail dot com @ 2022-04-25 12:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105375
--- Comment #2 from raldone01 <raldone01 at gmail dot com> ---
Created attachment 52867
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52867&action=edit
All the request files.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug libstdc++/105375] std::packaged_task has no deduction guide.
2022-04-25 12:49 [Bug libstdc++/105375] New: std::packaged_task has no deduction guide raldone01 at gmail dot com
2022-04-25 12:49 ` [Bug libstdc++/105375] " raldone01 at gmail dot com
2022-04-25 12:51 ` raldone01 at gmail dot com
@ 2022-04-25 13:12 ` redi at gcc dot gnu.org
2022-04-25 13:21 ` redi at gcc dot gnu.org
` (6 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: redi at gcc dot gnu.org @ 2022-04-25 13:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105375
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Last reconfirmed| |2022-04-25
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
cppreference says it's defined since C++17 but that's wrong, it was a
post-C++20 LWG issue: https://cplusplus.github.io/LWG/issue3117
We don't implement it yet.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug libstdc++/105375] std::packaged_task has no deduction guide.
2022-04-25 12:49 [Bug libstdc++/105375] New: std::packaged_task has no deduction guide raldone01 at gmail dot com
` (2 preceding siblings ...)
2022-04-25 13:12 ` redi at gcc dot gnu.org
@ 2022-04-25 13:21 ` redi at gcc dot gnu.org
2022-04-25 13:51 ` raldone01 at gmail dot com
` (5 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: redi at gcc dot gnu.org @ 2022-04-25 13:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105375
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Ah it's noted as a DR at
https://en.cppreference.com/w/cpp/thread/packaged_task#Defect_reports
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug libstdc++/105375] std::packaged_task has no deduction guide.
2022-04-25 12:49 [Bug libstdc++/105375] New: std::packaged_task has no deduction guide raldone01 at gmail dot com
` (3 preceding siblings ...)
2022-04-25 13:21 ` redi at gcc dot gnu.org
@ 2022-04-25 13:51 ` raldone01 at gmail dot com
2022-04-25 14:54 ` redi at gcc dot gnu.org
` (4 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: raldone01 at gmail dot com @ 2022-04-25 13:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105375
--- Comment #5 from raldone01 <raldone01 at gmail dot com> ---
Thank you for your reply.
What does that mean?
Are defect reports updates for older standards?
Is it meant to be available at some point in c++17?
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug libstdc++/105375] std::packaged_task has no deduction guide.
2022-04-25 12:49 [Bug libstdc++/105375] New: std::packaged_task has no deduction guide raldone01 at gmail dot com
` (4 preceding siblings ...)
2022-04-25 13:51 ` raldone01 at gmail dot com
@ 2022-04-25 14:54 ` redi at gcc dot gnu.org
2022-04-25 16:05 ` cvs-commit at gcc dot gnu.org
` (3 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: redi at gcc dot gnu.org @ 2022-04-25 14:54 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105375
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to raldone01 from comment #5)
> Thank you for your reply.
> What does that mean?
As it says at the link in comment 4, "The following behavior-changing defect
reports were applied retroactively to previously published C++ standards."
> Are defect reports updates for older standards?
Yes.
> Is it meant to be available at some point in c++17?
Yes.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug libstdc++/105375] std::packaged_task has no deduction guide.
2022-04-25 12:49 [Bug libstdc++/105375] New: std::packaged_task has no deduction guide raldone01 at gmail dot com
` (5 preceding siblings ...)
2022-04-25 14:54 ` redi at gcc dot gnu.org
@ 2022-04-25 16:05 ` cvs-commit at gcc dot gnu.org
2022-04-25 16:25 ` redi at gcc dot gnu.org
` (2 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2022-04-25 16:05 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105375
--- Comment #7 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:a5cee0480c10bafa8ed65d49e5cedca23d98d7b7
commit r12-8249-ga5cee0480c10bafa8ed65d49e5cedca23d98d7b7
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Mon Apr 25 14:22:41 2022 +0100
libstdc++: Add deduction guides for std::packaged_task [PR105375]
This change was LWG 3117.
The test is copied from 20_util/function/cons/deduction.cc
libstdc++-v3/ChangeLog:
PR libstdc++/105375
* include/std/future (packaged_task): Add deduction guides.
* testsuite/30_threads/packaged_task/cons/deduction.cc: New test.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug libstdc++/105375] std::packaged_task has no deduction guide.
2022-04-25 12:49 [Bug libstdc++/105375] New: std::packaged_task has no deduction guide raldone01 at gmail dot com
` (6 preceding siblings ...)
2022-04-25 16:05 ` cvs-commit at gcc dot gnu.org
@ 2022-04-25 16:25 ` redi at gcc dot gnu.org
2022-04-26 12:31 ` cvs-commit at gcc dot gnu.org
2022-04-26 12:31 ` redi at gcc dot gnu.org
9 siblings, 0 replies; 11+ messages in thread
From: redi at gcc dot gnu.org @ 2022-04-25 16:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105375
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |11.4
--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed for GCC 12, but worth backporting to GCC 11 too.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug libstdc++/105375] std::packaged_task has no deduction guide.
2022-04-25 12:49 [Bug libstdc++/105375] New: std::packaged_task has no deduction guide raldone01 at gmail dot com
` (7 preceding siblings ...)
2022-04-25 16:25 ` redi at gcc dot gnu.org
@ 2022-04-26 12:31 ` cvs-commit at gcc dot gnu.org
2022-04-26 12:31 ` redi at gcc dot gnu.org
9 siblings, 0 replies; 11+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2022-04-26 12:31 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105375
--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Jonathan Wakely
<redi@gcc.gnu.org>:
https://gcc.gnu.org/g:eb6f6f638a547f0330cc7940c5389039b59e4e76
commit r11-9936-geb6f6f638a547f0330cc7940c5389039b59e4e76
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Mon Apr 25 14:22:41 2022 +0100
libstdc++: Add deduction guides for std::packaged_task [PR105375]
This change was LWG 3117.
The test is copied from 20_util/function/cons/deduction.cc
libstdc++-v3/ChangeLog:
PR libstdc++/105375
* include/std/future (packaged_task): Add deduction guides.
* testsuite/30_threads/packaged_task/cons/deduction.cc: New test.
(cherry picked from commit a5cee0480c10bafa8ed65d49e5cedca23d98d7b7)
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug libstdc++/105375] std::packaged_task has no deduction guide.
2022-04-25 12:49 [Bug libstdc++/105375] New: std::packaged_task has no deduction guide raldone01 at gmail dot com
` (8 preceding siblings ...)
2022-04-26 12:31 ` cvs-commit at gcc dot gnu.org
@ 2022-04-26 12:31 ` redi at gcc dot gnu.org
9 siblings, 0 replies; 11+ messages in thread
From: redi at gcc dot gnu.org @ 2022-04-26 12:31 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105375
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed for 11.4 too.
^ permalink raw reply [flat|nested] 11+ messages in thread
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2022-04-25 12:49 [Bug libstdc++/105375] New: std::packaged_task has no deduction guide raldone01 at gmail dot com
2022-04-25 12:49 ` [Bug libstdc++/105375] " raldone01 at gmail dot com
2022-04-25 12:51 ` raldone01 at gmail dot com
2022-04-25 13:12 ` redi at gcc dot gnu.org
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