https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115668
Bug ID: 115668
Summary: Cannot format chrono::duration<unsigned>
Product: gcc
Version: 13.3.1
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
std::format("", std::chrono::duration<unsigned>{}) fails with:
/home/jwakely/gcc/15/include/c++/15.0.0/bits/chrono_io.h:1699:44: error: no
matching function for call to ‘abs(const std::chrono::duration<unsigned int>&)’
1699 | return _M_f._M_format(chrono::abs(__d), __fc, __d <
__d.zero());
| ~~~~~~~~~~~^~~~~
chrono::abs is only defined for durations with signed rep types.
This fixes it:
--- a/libstdc++-v3/include/bits/chrono_io.h
+++ b/libstdc++-v3/include/bits/chrono_io.h
@@ -1696,10 +1696,10 @@ namespace __format
format(const chrono::duration<_Rep, _Period>& __d,
basic_format_context<_Out, _CharT>& __fc) const
{
- const bool __is_neg = __d < __d.zero();
- if (__is_neg)
- __d = -__d;
- return _M_f._M_format(__d, __fc, __is_neg);
+ if (__d < __d.zero())
+ return _M_f._M_format(-__d, __fc, true);
+ else
+ return _M_f._M_format(__d, __fc, false);
}
private:
