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* [Bug c++/110256] New: passing concept to concept compiles
@ 2023-06-14 17:59 ldalessandro at gmail dot com
2023-06-14 18:06 ` [Bug c++/110256] " pinskia at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: ldalessandro at gmail dot com @ 2023-06-14 17:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110256
Bug ID: 110256
Summary: passing concept to concept compiles
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ldalessandro at gmail dot com
Target Milestone: ---
I accidentally passed a concept to convertible_to and was surprised to see it
compile.
```
#include <concepts>
template <class T>
concept b = requires (T t ) {
{ auto(t) } -> std::convertible_to<std::integral>;
};
static_assert(b<int>);
```
https://godbolt.org/z/jh53n185s
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug c++/110256] passing concept to concept compiles 2023-06-14 17:59 [Bug c++/110256] New: passing concept to concept compiles ldalessandro at gmail dot com @ 2023-06-14 18:06 ` pinskia at gcc dot gnu.org 2023-06-14 18:09 ` pinskia at gcc dot gnu.org 2023-06-20 14:14 ` ppalka at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-06-14 18:06 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110256 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Reduced to: ``` template<class T> concept c = true; template<class T, class T1> concept d = false; template <class T> concept b = requires (T t ) { { t } -> d<c>; }; static_assert(!b<int>); ``` ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/110256] passing concept to concept compiles 2023-06-14 17:59 [Bug c++/110256] New: passing concept to concept compiles ldalessandro at gmail dot com 2023-06-14 18:06 ` [Bug c++/110256] " pinskia at gcc dot gnu.org @ 2023-06-14 18:09 ` pinskia at gcc dot gnu.org 2023-06-20 14:14 ` ppalka at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-06-14 18:09 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110256 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- MSVC also accepts this code ... It might be the case that clang is incorrectly rejecting it. Basically the way I understand is that b will always be false due to incorrect usage of std::integral/c here. templates can be used as a template argument even. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/110256] passing concept to concept compiles 2023-06-14 17:59 [Bug c++/110256] New: passing concept to concept compiles ldalessandro at gmail dot com 2023-06-14 18:06 ` [Bug c++/110256] " pinskia at gcc dot gnu.org 2023-06-14 18:09 ` pinskia at gcc dot gnu.org @ 2023-06-20 14:14 ` ppalka at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: ppalka at gcc dot gnu.org @ 2023-06-20 14:14 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110256 Patrick Palka <ppalka at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW CC| |ppalka at gcc dot gnu.org Last reconfirmed| |2023-06-20 Ever confirmed|0 |1 --- Comment #3 from Patrick Palka <ppalka at gcc dot gnu.org> --- We also incorrectly accept: template<class> concept c = true; template<class, class> concept d = true; d<c auto> auto x = 0; ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2023-06-20 14:14 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2023-06-14 17:59 [Bug c++/110256] New: passing concept to concept compiles ldalessandro at gmail dot com 2023-06-14 18:06 ` [Bug c++/110256] " pinskia at gcc dot gnu.org 2023-06-14 18:09 ` pinskia at gcc dot gnu.org 2023-06-20 14:14 ` ppalka at gcc dot gnu.org
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