* [Bug c++/92944] [concepts] redefinition error when using constrained structure template inside namespace
[not found] <bug-92944-4@http.gcc.gnu.org/bugzilla/>
@ 2020-07-29 13:32 ` redi at gcc dot gnu.org
2021-12-14 11:22 ` ed at catmur dot uk
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From: redi at gcc dot gnu.org @ 2020-07-29 13:32 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92944
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2020-07-29
Blocks| |67491
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
[Bug 67491] [meta-bug] concepts issues
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[not found] <bug-92944-4@http.gcc.gnu.org/bugzilla/>
2020-07-29 13:32 ` [Bug c++/92944] [concepts] redefinition error when using constrained structure template inside namespace redi at gcc dot gnu.org
@ 2021-12-14 11:22 ` ed at catmur dot uk
2021-12-17 20:53 ` ed at catmur dot uk
` (5 subsequent siblings)
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From: ed at catmur dot uk @ 2021-12-14 11:22 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92944
--- Comment #1 from Ed Catmur <ed at catmur dot uk> ---
This becomes problematic when N::Q is std::hash; we are encouraged not to
reopen namespace std but to specialize std::hash from the root namespace.
Example:
#include <functional>
template<class> constexpr bool P = false;
template<class> constexpr bool Q = false;
template<class T> requires P<T> struct std::hash<T> { std::size_t operator()(T)
{ return 1; } };
template<class U> requires Q<U> struct std::hash<U> { std::size_t operator()(U)
{ return 2; } };
struct S {};
template<> constexpr bool P<S> = true;
int i = std::hash<S>()(S());
clang and MSVC correctly accept this.
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[not found] <bug-92944-4@http.gcc.gnu.org/bugzilla/>
2020-07-29 13:32 ` [Bug c++/92944] [concepts] redefinition error when using constrained structure template inside namespace redi at gcc dot gnu.org
2021-12-14 11:22 ` ed at catmur dot uk
@ 2021-12-17 20:53 ` ed at catmur dot uk
2021-12-23 12:55 ` ppalka at gcc dot gnu.org
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From: ed at catmur dot uk @ 2021-12-17 20:53 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92944
--- Comment #2 from Ed Catmur <ed at catmur dot uk> ---
Sorry, meant to link this:
https://quuxplusone.github.io/blog/2021/10/27/dont-reopen-namespace-std/
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[not found] <bug-92944-4@http.gcc.gnu.org/bugzilla/>
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2021-12-17 20:53 ` ed at catmur dot uk
@ 2021-12-23 12:55 ` ppalka at gcc dot gnu.org
2021-12-28 9:29 ` pinskia at gcc dot gnu.org
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From: ppalka at gcc dot gnu.org @ 2021-12-23 12:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92944
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |florin at iucha dot net
--- Comment #3 from Patrick Palka <ppalka at gcc dot gnu.org> ---
*** Bug 103809 has been marked as a duplicate of this bug. ***
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[not found] <bug-92944-4@http.gcc.gnu.org/bugzilla/>
` (3 preceding siblings ...)
2021-12-23 12:55 ` ppalka at gcc dot gnu.org
@ 2021-12-28 9:29 ` pinskia at gcc dot gnu.org
2022-01-26 17:28 ` ppalka at gcc dot gnu.org
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From: pinskia at gcc dot gnu.org @ 2021-12-28 9:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92944
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fchelnokov at gmail dot com
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 103849 has been marked as a duplicate of this bug. ***
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[not found] <bug-92944-4@http.gcc.gnu.org/bugzilla/>
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2021-12-28 9:29 ` pinskia at gcc dot gnu.org
@ 2022-01-26 17:28 ` ppalka at gcc dot gnu.org
2022-01-27 16:02 ` cvs-commit at gcc dot gnu.org
2022-01-27 16:04 ` ppalka at gcc dot gnu.org
7 siblings, 0 replies; 8+ messages in thread
From: ppalka at gcc dot gnu.org @ 2022-01-26 17:28 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92944
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |ppalka at gcc dot gnu.org
CC| |ppalka at gcc dot gnu.org
Status|NEW |ASSIGNED
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[not found] <bug-92944-4@http.gcc.gnu.org/bugzilla/>
` (5 preceding siblings ...)
2022-01-26 17:28 ` ppalka at gcc dot gnu.org
@ 2022-01-27 16:02 ` cvs-commit at gcc dot gnu.org
2022-01-27 16:04 ` ppalka at gcc dot gnu.org
7 siblings, 0 replies; 8+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2022-01-27 16:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92944
--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppalka@gcc.gnu.org>:
https://gcc.gnu.org/g:ce6054a22ae14594a2919d2ad87cd9478e616fb3
commit r12-6896-gce6054a22ae14594a2919d2ad87cd9478e616fb3
Author: Patrick Palka <ppalka@redhat.com>
Date: Thu Jan 27 10:56:34 2022 -0500
c++: constrained partial spec using qualified name [PR92944, PR103678]
In the nested_name_specifier branch within cp_parser_class_head, we need
to update 'type' with the result of maybe_process_partial_specialization
like we do in the template_id_p branch.
PR c++/92944
PR c++/103678
gcc/cp/ChangeLog:
* parser.cc (cp_parser_class_head): Update 'type' with the result
of maybe_process_partial_specialization in the
nested_name_specifier branch. Refactor nearby code to accomodate
that maybe_process_partial_specialization returns a _TYPE, not a
TYPE_DECL, and eliminate local variable 'class_type' in passing.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/concepts-partial-spec10.C: New test.
* g++.dg/cpp2a/concepts-partial-spec11.C: New test.
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[not found] <bug-92944-4@http.gcc.gnu.org/bugzilla/>
` (6 preceding siblings ...)
2022-01-27 16:02 ` cvs-commit at gcc dot gnu.org
@ 2022-01-27 16:04 ` ppalka at gcc dot gnu.org
7 siblings, 0 replies; 8+ messages in thread
From: ppalka at gcc dot gnu.org @ 2022-01-27 16:04 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92944
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|ASSIGNED |RESOLVED
Target Milestone|--- |12.0
--- Comment #6 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Fixed for GCC 12, thanks for the bug report.
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