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* [Bug libstdc++/110504] New: std::format("{:%S}", duration<long, std::ratio<1,2>>(4)) returns "02.0" instead of "02"
@ 2023-06-30 16:35 redi at gcc dot gnu.org
2023-06-30 16:55 ` [Bug libstdc++/110504] " redi at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: redi at gcc dot gnu.org @ 2023-06-30 16:35 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110504
Bug ID: 110504
Summary: std::format("{:%S}", duration<long,
std::ratio<1,2>>(4)) returns "02.0" instead of "02"
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
And std::format("{:%M:%S}", duration<long, std::ratio<2, 3>>(99)) returns
"01:06.000000" instead of "01:06"
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug libstdc++/110504] std::format("{:%S}", duration<long, std::ratio<1,2>>(4)) returns "02.0" instead of "02"
2023-06-30 16:35 [Bug libstdc++/110504] New: std::format("{:%S}", duration<long, std::ratio<1,2>>(4)) returns "02.0" instead of "02" redi at gcc dot gnu.org
@ 2023-06-30 16:55 ` redi at gcc dot gnu.org
2023-06-30 23:16 ` redi at gcc dot gnu.org
2023-07-10 14:43 ` redi at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: redi at gcc dot gnu.org @ 2023-06-30 16:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110504
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2023-06-30
Ever confirmed|0 |1
Status|UNCONFIRMED |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug libstdc++/110504] std::format("{:%S}", duration<long, std::ratio<1,2>>(4)) returns "02.0" instead of "02"
2023-06-30 16:35 [Bug libstdc++/110504] New: std::format("{:%S}", duration<long, std::ratio<1,2>>(4)) returns "02.0" instead of "02" redi at gcc dot gnu.org
2023-06-30 16:55 ` [Bug libstdc++/110504] " redi at gcc dot gnu.org
@ 2023-06-30 23:16 ` redi at gcc dot gnu.org
2023-07-10 14:43 ` redi at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: redi at gcc dot gnu.org @ 2023-06-30 23:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110504
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I have a patch to fix this:
--- a/libstdc++-v3/include/bits/chrono_io.h
+++ b/libstdc++-v3/include/bits/chrono_io.h
@@ -1079,7 +1079,9 @@ namespace __format
{
locale __loc = _M_locale(__ctx);
auto __ss = __hms.subseconds();
- if constexpr (is_floating_point_v<rep>)
+ if (__ss == __ss.zero())
+ ; // Do not write all-zero fractional part.
+ else if constexpr (is_floating_point_v<rep>)
{
__out = std::format_to(__loc, std::move(__out),
_GLIBCXX_WIDEN("{:.{}Lg}"),
However the example in [time.clock.utc.nonmembers] suggests that in fact
printing the zeros is correct. The sys_time<milliseconds> value is printed as
"2015-06-30 23:59:60.000 UTC" which would be altered by the patch above.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug libstdc++/110504] std::format("{:%S}", duration<long, std::ratio<1,2>>(4)) returns "02.0" instead of "02"
2023-06-30 16:35 [Bug libstdc++/110504] New: std::format("{:%S}", duration<long, std::ratio<1,2>>(4)) returns "02.0" instead of "02" redi at gcc dot gnu.org
2023-06-30 16:55 ` [Bug libstdc++/110504] " redi at gcc dot gnu.org
2023-06-30 23:16 ` redi at gcc dot gnu.org
@ 2023-07-10 14:43 ` redi at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: redi at gcc dot gnu.org @ 2023-07-10 14:43 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110504
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |INVALID
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The current code in libstdc++ is correct here.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2023-07-10 14:43 UTC | newest]
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2023-06-30 16:35 [Bug libstdc++/110504] New: std::format("{:%S}", duration<long, std::ratio<1,2>>(4)) returns "02.0" instead of "02" redi at gcc dot gnu.org
2023-06-30 16:55 ` [Bug libstdc++/110504] " redi at gcc dot gnu.org
2023-06-30 23:16 ` redi at gcc dot gnu.org
2023-07-10 14:43 ` redi at gcc dot gnu.org
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