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* [Bug c++/103849] New: std::hash specializations with distinct concepts fails
@ 2021-12-28 7:03 fchelnokov at gmail dot com
2021-12-28 9:29 ` [Bug c++/103849] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: fchelnokov at gmail dot com @ 2021-12-28 7:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103849
Bug ID: 103849
Summary: std::hash specializations with distinct concepts fails
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fchelnokov at gmail dot com
Target Milestone: ---
The two specialization of std::hash with distinct concepts:
```
#include <concepts>
#include <functional>
template <std::convertible_to<int> T>
struct std::hash<T> {};
template <std::convertible_to<float> U>
struct std::hash<U> {};
int main() {}
```
fails to compile in GCC with the error:
```
error: redefinition of 'struct std::hash<_Tp>'
8 | struct std::hash<U> {};
```
Clang and MSVC have no problem with it. Demo:
https://gcc.godbolt.org/z/z4f3o6bdo
Related discussion: https://stackoverflow.com/q/68885697/7325599
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/103849] std::hash specializations with distinct concepts fails
2021-12-28 7:03 [Bug c++/103849] New: std::hash specializations with distinct concepts fails fchelnokov at gmail dot com
@ 2021-12-28 9:29 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
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=103849
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of bug 92944.
*** This bug has been marked as a duplicate of bug 92944 ***
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-12-28 7:03 [Bug c++/103849] New: std::hash specializations with distinct concepts fails fchelnokov at gmail dot com
2021-12-28 9:29 ` [Bug c++/103849] " pinskia at gcc dot gnu.org
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