ClickHouse/base/ext/chrono_io.h
2020-07-05 02:16:16 +03:00

50 lines
1.7 KiB
C++

#pragma once
#include <chrono>
#include <string>
#include <sstream>
#include <cctz/time_zone.h>
namespace ext
{
inline std::string to_string(const std::time_t & time)
{
return cctz::format("%Y-%m-%d %H:%M:%S", std::chrono::system_clock::from_time_t(time), cctz::local_time_zone());
}
template <typename Clock, typename Duration = typename Clock::duration>
std::string to_string(const std::chrono::time_point<Clock, Duration> & tp)
{
// Don't use DateLUT because it shows weird characters for
// TimePoint::max(). I wish we could use C++20 format, but it's not
// there yet.
// return DateLUT::instance().timeToString(std::chrono::system_clock::to_time_t(tp));
auto in_time_t = std::chrono::system_clock::to_time_t(tp);
return to_string(in_time_t);
}
template <typename Rep, typename Period = std::ratio<1>>
std::string to_string(const std::chrono::duration<Rep, Period> & dur)
{
auto seconds_as_int = std::chrono::duration_cast<std::chrono::seconds>(dur);
if (seconds_as_int == dur)
return std::to_string(seconds_as_int.count()) + "s";
auto seconds_as_double = std::chrono::duration_cast<std::chrono::duration<double>>(dur);
return std::to_string(seconds_as_double.count()) + "s";
}
template <typename Clock, typename Duration = typename Clock::duration>
std::ostream & operator<<(std::ostream & o, const std::chrono::time_point<Clock, Duration> & tp)
{
return o << to_string(tp);
}
template <typename Rep, typename Period = std::ratio<1>>
std::ostream & operator<<(std::ostream & o, const std::chrono::duration<Rep, Period> & dur)
{
return o << to_string(dur);
}
}