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* [Bug c++/110904] New: __is_convertible incorrectly reports non-referenceable function prototypes as convertible
@ 2023-08-04 18:05 nikolasklauser at berlin dot de
2023-08-04 18:08 ` [Bug c++/110904] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: nikolasklauser at berlin dot de @ 2023-08-04 18:05 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110904
Bug ID: 110904
Summary: __is_convertible incorrectly reports non-referenceable
function prototypes as convertible
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: nikolasklauser at berlin dot de
Target Milestone: ---
```
#include <utility>
using Function = void();
using ConstFunction = void() const;
static_assert((!std::is_convertible<ConstFunction, Function>::value), "");
static_assert((!std::is_convertible<ConstFunction, Function*>::value), ""); //
convertible
static_assert((!std::is_convertible<ConstFunction, Function&>::value), ""); //
convertible
static_assert((!std::is_convertible<ConstFunction, Function&&>::value), ""); //
convertible
static_assert((!std::is_convertible<Function*, ConstFunction>::value), "");
static_assert((!std::is_convertible<Function&, ConstFunction>::value), "");
static_assert((!std::is_convertible<ConstFunction, ConstFunction>::value), "");
static_assert((!std::is_convertible<ConstFunction, void>::value), "");
```
__is_convertible() claims that the cases marked above are convertible, but
AFAICT that shouldn't be true. According to the standard,
```
To test() {
return declval<From>();
}
```
has to be well formed, but that's never the case for `ConstFunction`.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/110904] __is_convertible incorrectly reports non-referenceable function prototypes as convertible
2023-08-04 18:05 [Bug c++/110904] New: __is_convertible incorrectly reports non-referenceable function prototypes as convertible nikolasklauser at berlin dot de
@ 2023-08-04 18:08 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-08-04 18:08 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110904
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of bug 109680.
*** This bug has been marked as a duplicate of bug 109680 ***
^ permalink raw reply [flat|nested] 2+ messages in thread
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2023-08-04 18:05 [Bug c++/110904] New: __is_convertible incorrectly reports non-referenceable function prototypes as convertible nikolasklauser at berlin dot de
2023-08-04 18:08 ` [Bug c++/110904] " pinskia at gcc dot gnu.org
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