https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114240
Bug ID: 114240
Summary: sys_days not being parsed with only a date in the
stream
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: howard.hinnant at gmail dot com
Target Milestone: ---
#include <chrono>
#include <iostream>
#include <sstream>
int main(int argc, char**argv){
std::istringstream ssStart{"2024-01-01"};
std::istringstream ssEnd("2024-02-01");
ssStart.exceptions(std::ios::failbit);
std::chrono::sys_days tStart, tEnd;
ssStart >> std::chrono::parse("%Y-%m-%d ", tStart);
ssEnd >> std::chrono::parse("%Y-%m-%d ", tEnd);
auto tDays = tEnd-tStart;
std::cout << ssStart.str() << "," << ssEnd.str() << "," << tDays.count() <<
std::endl;
}
Expected output:
2024-01-01,2024-02-01,31
Actual output:
terminate called after throwing an instance of 'std::__ios_failure'
what(): basic_ios::clear: iostream error
I expected this function: http://eel.is/c++draft/time.clock.system.nonmembers#6
to successfully parse the days-precision time_point because there is sufficient
information in the stream to form a valid date.
Demo: https://wandbox.org/permlink/FrtMteIddnb4ogpZ
