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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] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 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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