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* [Bug libstdc++/94565] New: C++20: Comparing comparison category types against 0/nullptr is not noexcept
@ 2020-04-11 21:27 daniel.kruegler at googlemail dot com
2020-04-13 20:25 ` [Bug libstdc++/94565] " redi at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2020-04-11 21:27 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94565
Bug ID: 94565
Summary: C++20: Comparing comparison category types against
0/nullptr is not noexcept
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: daniel.kruegler at googlemail dot com
Target Milestone: ---
The following program should be accepted, but is rejected due to a violation of
the static_assertion:
Compiler options:
-Wall -Wextra -pedantic "-std=c++20"
//---------------------
#include <compare>
int main()
{
static_assert(noexcept(std::partial_ordering::less == 0));
}
//---------------------
prog.cc: In function 'int main()':
prog.cc:5:17: error: static assertion failed
5 | static_assert(noexcept(std::partial_ordering::less == 0));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The corresponding comparison functions for are all declared as noexcept
([cmp.partialord], [cmp.weakord], [cmp.strongord]), so the clear intention is
that such an comparison should be observable as non-throwing operations. The
reason why above test fails for all of the existing mixed comparison functions
of all the three comparison category types against 0/nullptr is caused by the
fact that the implementation-internal type std::__cmp_cat::__unspec in header
<compare> misses to declare its converting constructor as noexcept:
struct __unspec
{
constexpr __unspec(__unspec*) { }
};
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug libstdc++/94565] C++20: Comparing comparison category types against 0/nullptr is not noexcept
2020-04-11 21:27 [Bug libstdc++/94565] New: C++20: Comparing comparison category types against 0/nullptr is not noexcept daniel.kruegler at googlemail dot com
@ 2020-04-13 20:25 ` redi at gcc dot gnu.org
2020-04-14 10:43 ` cvs-commit at gcc dot gnu.org
2020-04-14 10:44 ` redi at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: redi at gcc dot gnu.org @ 2020-04-13 20:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94565
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2020-04-13
Ever confirmed|0 |1
Target Milestone|--- |10.0
Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug libstdc++/94565] C++20: Comparing comparison category types against 0/nullptr is not noexcept
2020-04-11 21:27 [Bug libstdc++/94565] New: C++20: Comparing comparison category types against 0/nullptr is not noexcept daniel.kruegler at googlemail dot com
2020-04-13 20:25 ` [Bug libstdc++/94565] " redi at gcc dot gnu.org
@ 2020-04-14 10:43 ` cvs-commit at gcc dot gnu.org
2020-04-14 10:44 ` redi at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2020-04-14 10:43 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94565
--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:
https://gcc.gnu.org/g:597601aa7a0f822816041d521fae7da6e883fa7d
commit r10-7710-g597601aa7a0f822816041d521fae7da6e883fa7d
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Tue Apr 14 11:23:34 2020 +0100
libstdc++: Make comparison category comparisons noexcept (PR 94565)
PR libstdc++/94565
* libsupc++/compare (__unspec): Add noexcept-specifier to
constructor.
* testsuite/18_support/comparisons/categories/94565.cc: New test.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug libstdc++/94565] C++20: Comparing comparison category types against 0/nullptr is not noexcept
2020-04-11 21:27 [Bug libstdc++/94565] New: C++20: Comparing comparison category types against 0/nullptr is not noexcept daniel.kruegler at googlemail dot com
2020-04-13 20:25 ` [Bug libstdc++/94565] " redi at gcc dot gnu.org
2020-04-14 10:43 ` cvs-commit at gcc dot gnu.org
@ 2020-04-14 10:44 ` redi at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: redi at gcc dot gnu.org @ 2020-04-14 10:44 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94565
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2020-04-14 10:44 UTC | newest]
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2020-04-11 21:27 [Bug libstdc++/94565] New: C++20: Comparing comparison category types against 0/nullptr is not noexcept daniel.kruegler at googlemail dot com
2020-04-13 20:25 ` [Bug libstdc++/94565] " redi at gcc dot gnu.org
2020-04-14 10:43 ` cvs-commit at gcc dot gnu.org
2020-04-14 10:44 ` redi at gcc dot gnu.org
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