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* [Bug c++/99909] New: The value of 'std::is_integral_v<auto>' is not usable in a constant expression
@ 2021-04-04 18:30 hewillk at gmail dot com
2021-04-06 18:59 ` [Bug c++/99909] " jason at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: hewillk at gmail dot com @ 2021-04-04 18:30 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99909
Bug ID: 99909
Summary: The value of 'std::is_integral_v<auto>' is not usable
in a constant expression
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: hewillk at gmail dot com
Target Milestone: ---
https://godbolt.org/z/jWr39rrsT
#include <concepts>
template <std::integral auto>
struct S {};
template <template <std::integral auto> class>
constexpr auto f() {}
int main() {
f<S>();
}
gcc rejects this code with:
In file included from <source>:1:
/opt/compiler-explorer/gcc-trunk-20210404/include/c++/11.0.1/concepts:102:13:
required for the satisfaction of 'integral<auto [requires
std::integral<<placeholder>, >]>' [with auto [requires
std::integral<<placeholder>, >] = auto [requires std::integral<<placeholder>,
>]]
/opt/compiler-explorer/gcc-trunk-20210404/include/c++/11.0.1/concepts:102:24:
error: the value of 'std::is_integral_v<auto [requires
std::integral<<placeholder>, >]>' is not usable in a constant expression
102 | concept integral = is_integral_v<_Tp>;
| ^~~~~~~~~~~~~~~~~~
In file included from
/opt/compiler-explorer/gcc-trunk-20210404/include/c++/11.0.1/concepts:44,
from <source>:1:
/opt/compiler-explorer/gcc-trunk-20210404/include/c++/11.0.1/type_traits: In
function 'int main()':
/opt/compiler-explorer/gcc-trunk-20210404/include/c++/11.0.1/type_traits:3026:25:
note: 'std::is_integral_v<auto [requires std::integral<<placeholder>, >]>' used
in its own initializer
3026 | inline constexpr bool is_integral_v = is_integral<_Tp>::value;
| ^~~~~~~~~~~~~
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/99909] The value of 'std::is_integral_v<auto>' is not usable in a constant expression
2021-04-04 18:30 [Bug c++/99909] New: The value of 'std::is_integral_v<auto>' is not usable in a constant expression hewillk at gmail dot com
@ 2021-04-06 18:59 ` jason at gcc dot gnu.org
2021-06-29 14:23 ` giecrilj at stegny dot 2a.pl
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jason at gcc dot gnu.org @ 2021-04-06 18:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99909
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jason at gcc dot gnu.org
Last reconfirmed| |2021-04-06
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Blocks| |67491
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
[Bug 67491] [meta-bug] concepts issues
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/99909] The value of 'std::is_integral_v<auto>' is not usable in a constant expression
2021-04-04 18:30 [Bug c++/99909] New: The value of 'std::is_integral_v<auto>' is not usable in a constant expression hewillk at gmail dot com
2021-04-06 18:59 ` [Bug c++/99909] " jason at gcc dot gnu.org
@ 2021-06-29 14:23 ` giecrilj at stegny dot 2a.pl
2021-06-29 15:17 ` hewillk at gmail dot com
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: giecrilj at stegny dot 2a.pl @ 2021-06-29 14:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99909
Christopher Yeleighton <giecrilj at stegny dot 2a.pl> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |giecrilj at stegny dot 2a.pl
--- Comment #1 from Christopher Yeleighton <giecrilj at stegny dot 2a.pl> ---
(In reply to 康桓瑋 from comment #0)
> template <template <std::integral auto> class>
> constexpr auto f() {}
That means auto is void, doesn’t it?
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/99909] The value of 'std::is_integral_v<auto>' is not usable in a constant expression
2021-04-04 18:30 [Bug c++/99909] New: The value of 'std::is_integral_v<auto>' is not usable in a constant expression hewillk at gmail dot com
2021-04-06 18:59 ` [Bug c++/99909] " jason at gcc dot gnu.org
2021-06-29 14:23 ` giecrilj at stegny dot 2a.pl
@ 2021-06-29 15:17 ` hewillk at gmail dot com
2021-09-27 19:38 ` ppalka at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: hewillk at gmail dot com @ 2021-06-29 15:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99909
--- Comment #2 from 康桓瑋 <hewillk at gmail dot com> ---
(In reply to Christopher Yeleighton from comment #1)
> (In reply to 康桓瑋 from comment #0)
> > template <template <std::integral auto> class>
> > constexpr auto f() {}
>
> That means auto is void, doesn’t it?
Yes, the second auto just means void.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/99909] The value of 'std::is_integral_v<auto>' is not usable in a constant expression
2021-04-04 18:30 [Bug c++/99909] New: The value of 'std::is_integral_v<auto>' is not usable in a constant expression hewillk at gmail dot com
` (2 preceding siblings ...)
2021-06-29 15:17 ` hewillk at gmail dot com
@ 2021-09-27 19:38 ` ppalka at gcc dot gnu.org
2021-09-28 21:26 ` cvs-commit at gcc dot gnu.org
2021-09-28 21:27 ` ppalka at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: ppalka at gcc dot gnu.org @ 2021-09-27 19:38 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99909
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC| |ppalka at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |ppalka at gcc dot gnu.org
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/99909] The value of 'std::is_integral_v<auto>' is not usable in a constant expression
2021-04-04 18:30 [Bug c++/99909] New: The value of 'std::is_integral_v<auto>' is not usable in a constant expression hewillk at gmail dot com
` (3 preceding siblings ...)
2021-09-27 19:38 ` ppalka at gcc dot gnu.org
@ 2021-09-28 21:26 ` cvs-commit at gcc dot gnu.org
2021-09-28 21:27 ` ppalka at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-09-28 21:26 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99909
--- Comment #3 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:daa762f01d8cf932484b7df122a5e872439bc92c
commit r12-3950-gdaa762f01d8cf932484b7df122a5e872439bc92c
Author: Patrick Palka <ppalka@redhat.com>
Date: Tue Sep 28 17:26:20 2021 -0400
c++: ttp matching with constrained auto parm [PR99909]
Here, when unifying TT with S, processing_template_decl is unset, and
this foils the dependence checks in do_auto_deduction for avoiding
checking constraints on an auto when the initializer is dependent.
This patch fixes this by making sure processing_template_decl is set
around the call to unify from coerce_template_template_parms; this seems
sensible because we're unifying one set of template parameters with
another, so we're dealing with templated trees throughout.
PR c++/99909
gcc/cp/ChangeLog:
* pt.c (coerce_template_template_parms): Keep
processing_template_decl set around the call to unify as well.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/concepts-ttp3.C: New test.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/99909] The value of 'std::is_integral_v<auto>' is not usable in a constant expression
2021-04-04 18:30 [Bug c++/99909] New: The value of 'std::is_integral_v<auto>' is not usable in a constant expression hewillk at gmail dot com
` (4 preceding siblings ...)
2021-09-28 21:26 ` cvs-commit at gcc dot gnu.org
@ 2021-09-28 21:27 ` ppalka at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: ppalka at gcc dot gnu.org @ 2021-09-28 21:27 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99909
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |12.0
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Fixed for GCC 12, thanks for the report.
^ permalink raw reply [flat|nested] 7+ messages in thread
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2021-04-04 18:30 [Bug c++/99909] New: The value of 'std::is_integral_v<auto>' is not usable in a constant expression hewillk at gmail dot com
2021-04-06 18:59 ` [Bug c++/99909] " jason at gcc dot gnu.org
2021-06-29 14:23 ` giecrilj at stegny dot 2a.pl
2021-06-29 15:17 ` hewillk at gmail dot com
2021-09-27 19:38 ` ppalka at gcc dot gnu.org
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