https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93161
Bug ID: 93161
Summary: Remove extra operator== for comparison categories in
<compare> not in standard
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: wezrule at hotmail dot com
Target Milestone: ---
The following compiles fine with gcc (on godbolt gcc trunk):
int x{2};
int y{2};
auto s = x <=> y;
s == std::strong_ordering::equal; // fails with MSVC
https://godbolt.org/z/baRNF6
However the last line fails to compile with MSVC. After checking the standards
library support document operator==(strong_ordering, strong_ordering) is not
mentioned:
http://wg21.link/p0768
On the gcc master branch it can be located here (same exists for weak_ordering
and other comparison categories):
https://github.com/wezrule/gcc/blob/master/libstdc%2B%2B-v3/libsupc%2B%2B/compare#L299
Even worse is that value types are not even standardised for comparison
operators! (thanks Bo Persson):
http://wg21.link/P1946
I think these should just be removed, it's recommended to compare against 0 and
would be good to not have further inconsistencies in implementations.
Cheers,
Wesley
