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* [Bug c++/94422] New: static_cast from std::array to enum class
@ 2020-03-31 9:41 vincent.hamp at higaski dot at
2020-03-31 10:17 ` [Bug c++/94422] [9 Regression] static_cast from std::array operator[] " redi at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: vincent.hamp at higaski dot at @ 2020-03-31 9:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94422
Bug ID: 94422
Summary: static_cast from std::array to enum class
Product: gcc
Version: 9.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vincent.hamp at higaski dot at
Target Milestone: ---
static_cast from std::array operator[] to an enum class inside a template class
produces an unexpected expression error. It seems that error is only present in
9.3, 9.2 and trunk work.
#include <array>
#include <cstdint>
enum class EnumC : int8_t { Forward = 1, Backward = -1 };
std::array<uint8_t, sizeof(EnumC)> buf;
template <typename T>
struct S {
void foo() { auto const cast_to_enum{static_cast<EnumC>(buf[0])}; }
};
S<int> s;
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/94422] [9 Regression] static_cast from std::array operator[] to enum class
2020-03-31 9:41 [Bug c++/94422] New: static_cast from std::array to enum class vincent.hamp at higaski dot at
@ 2020-03-31 10:17 ` redi at gcc dot gnu.org
2020-03-31 10:24 ` [Bug c++/94422] [9/10 " redi at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: redi at gcc dot gnu.org @ 2020-03-31 10:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94422
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Ever confirmed|0 |1
Last reconfirmed| |2020-03-31
Known to work| |9.2.0
Summary|static_cast from std::array |[9 Regression] static_cast
|operator[] to enum class |from std::array operator[]
| |to enum class
Known to fail| |9.3.0
Status|UNCONFIRMED |NEW
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
You didn't say what gcc options you're using, and since this only happens with
C++17 or C++20 (not the default options) that's not very helpful.
Confirmed for -std=gnu++17
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/94422] [9/10 Regression] static_cast from std::array operator[] to enum class
2020-03-31 9:41 [Bug c++/94422] New: static_cast from std::array to enum class vincent.hamp at higaski dot at
2020-03-31 10:17 ` [Bug c++/94422] [9 Regression] static_cast from std::array operator[] " redi at gcc dot gnu.org
@ 2020-03-31 10:24 ` redi at gcc dot gnu.org
2020-03-31 11:59 ` [Bug c++/94422] [9 " rguenth at gcc dot gnu.org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: redi at gcc dot gnu.org @ 2020-03-31 10:24 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94422
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[9 Regression] static_cast |[9/10 Regression]
|from std::array operator[] |static_cast from std::array
|to enum class |operator[] to enum class
Known to fail| |10.0
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced:
// { dg-options "-std=gnu++17" }
template<typename T, unsigned N>
struct array
{
T data[N];
constexpr T& operator[](unsigned n) { return data[n]; }
};
enum class EnumC : signed char { Forward = 1, Backward = -1 };
array<unsigned char, sizeof(EnumC)> buf;
template <typename T>
struct S {
void foo() { auto const cast_to_enum{static_cast<EnumC>(buf[0])}; }
};
S<int> s;
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/94422] [9 Regression] static_cast from std::array operator[] to enum class
2020-03-31 9:41 [Bug c++/94422] New: static_cast from std::array to enum class vincent.hamp at higaski dot at
2020-03-31 10:17 ` [Bug c++/94422] [9 Regression] static_cast from std::array operator[] " redi at gcc dot gnu.org
2020-03-31 10:24 ` [Bug c++/94422] [9/10 " redi at gcc dot gnu.org
@ 2020-03-31 11:59 ` rguenth at gcc dot gnu.org
2020-03-31 16:23 ` jakub at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2020-03-31 11:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94422
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.4
Priority|P3 |P2
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/94422] [9 Regression] static_cast from std::array operator[] to enum class
2020-03-31 9:41 [Bug c++/94422] New: static_cast from std::array to enum class vincent.hamp at higaski dot at
` (2 preceding siblings ...)
2020-03-31 11:59 ` [Bug c++/94422] [9 " rguenth at gcc dot gnu.org
@ 2020-03-31 16:23 ` jakub at gcc dot gnu.org
2021-06-01 8:17 ` rguenth at gcc dot gnu.org
2022-05-27 8:50 ` rguenth at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2020-03-31 16:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94422
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |jason at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r9-8323-gb4e53e9b3c963b1c0fe9637618dec8042764f599
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/94422] [9 Regression] static_cast from std::array operator[] to enum class
2020-03-31 9:41 [Bug c++/94422] New: static_cast from std::array to enum class vincent.hamp at higaski dot at
` (3 preceding siblings ...)
2020-03-31 16:23 ` jakub at gcc dot gnu.org
@ 2021-06-01 8:17 ` rguenth at gcc dot gnu.org
2022-05-27 8:50 ` rguenth at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-06-01 8:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94422
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|9.4 |9.5
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 9.4 is being released, retargeting bugs to GCC 9.5.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/94422] [9 Regression] static_cast from std::array operator[] to enum class
2020-03-31 9:41 [Bug c++/94422] New: static_cast from std::array to enum class vincent.hamp at higaski dot at
` (4 preceding siblings ...)
2021-06-01 8:17 ` rguenth at gcc dot gnu.org
@ 2022-05-27 8:50 ` rguenth at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2022-05-27 8:50 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94422
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Target Milestone|9.5 |10.0
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed in GCC 10.
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2022-05-27 8:50 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-03-31 9:41 [Bug c++/94422] New: static_cast from std::array to enum class vincent.hamp at higaski dot at
2020-03-31 10:17 ` [Bug c++/94422] [9 Regression] static_cast from std::array operator[] " redi at gcc dot gnu.org
2020-03-31 10:24 ` [Bug c++/94422] [9/10 " redi at gcc dot gnu.org
2020-03-31 11:59 ` [Bug c++/94422] [9 " rguenth at gcc dot gnu.org
2020-03-31 16:23 ` jakub at gcc dot gnu.org
2021-06-01 8:17 ` rguenth at gcc dot gnu.org
2022-05-27 8:50 ` rguenth at gcc dot gnu.org
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