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* [Bug c++/97934] New: Defaulting <=> breaks other equality operators
@ 2020-11-21 22:09 barry.revzin at gmail dot com
2020-11-21 22:20 ` [Bug c++/97934] Adding an operator== breaks implicit operator== generation from defaulted <=> mpolacek at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: barry.revzin at gmail dot com @ 2020-11-21 22:09 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97934
Bug ID: 97934
Summary: Defaulting <=> breaks other equality operators
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: barry.revzin at gmail dot com
Target Milestone: ---
Reduced example:
#include <compare>
struct X
{
auto operator<=>(X const&) const = default;
auto operator==(int i) const;
};
bool f(X x) {
return x == x;
}
gcc trunk rejects this saying no matching candidate. The presence of the
unrelated operator== seems to prevent the generation of X::operator==(X const&)
const from the defaulted <=>.
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug c++/97934] Adding an operator== breaks implicit operator== generation from defaulted <=> 2020-11-21 22:09 [Bug c++/97934] New: Defaulting <=> breaks other equality operators barry.revzin at gmail dot com @ 2020-11-21 22:20 ` mpolacek at gcc dot gnu.org 2020-11-22 1:59 ` ensadc at mailnesia dot com 2021-09-23 7:13 ` fchelnokov at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: mpolacek at gcc dot gnu.org @ 2020-11-21 22:20 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97934 Marek Polacek <mpolacek at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2020-11-21 CC| |mpolacek at gcc dot gnu.org Ever confirmed|0 |1 Keywords| |rejects-valid --- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Confirmed. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/97934] Adding an operator== breaks implicit operator== generation from defaulted <=> 2020-11-21 22:09 [Bug c++/97934] New: Defaulting <=> breaks other equality operators barry.revzin at gmail dot com 2020-11-21 22:20 ` [Bug c++/97934] Adding an operator== breaks implicit operator== generation from defaulted <=> mpolacek at gcc dot gnu.org @ 2020-11-22 1:59 ` ensadc at mailnesia dot com 2021-09-23 7:13 ` fchelnokov at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: ensadc at mailnesia dot com @ 2020-11-22 1:59 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97934 ensadc at mailnesia dot com changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |ensadc at mailnesia dot com --- Comment #2 from ensadc at mailnesia dot com --- Per [class.compare.default] (http://eel.is/c++draft/class.compare.default#5.sentence-1 ), the == operator is implicitly generated if the member-specification does not declare *any* operator==. So the current behavior seems correct? ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/97934] Adding an operator== breaks implicit operator== generation from defaulted <=> 2020-11-21 22:09 [Bug c++/97934] New: Defaulting <=> breaks other equality operators barry.revzin at gmail dot com 2020-11-21 22:20 ` [Bug c++/97934] Adding an operator== breaks implicit operator== generation from defaulted <=> mpolacek at gcc dot gnu.org 2020-11-22 1:59 ` ensadc at mailnesia dot com @ 2021-09-23 7:13 ` fchelnokov at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: fchelnokov at gmail dot com @ 2021-09-23 7:13 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97934 Fedor Chelnokov <fchelnokov at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |fchelnokov at gmail dot com --- Comment #3 from Fedor Chelnokov <fchelnokov at gmail dot com> --- I believe, GCC is correct here as well as other compilers: https://gcc.godbolt.org/z/4nrdedbGd ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2021-09-23 7:13 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2020-11-21 22:09 [Bug c++/97934] New: Defaulting <=> breaks other equality operators barry.revzin at gmail dot com 2020-11-21 22:20 ` [Bug c++/97934] Adding an operator== breaks implicit operator== generation from defaulted <=> mpolacek at gcc dot gnu.org 2020-11-22 1:59 ` ensadc at mailnesia dot com 2021-09-23 7:13 ` fchelnokov at gmail dot com
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