ClickHouse/base/ext/chrono_io.h

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#pragma once
#include <chrono>
#include <ctime>
#include <string>
#include <iomanip>
namespace ext
{
inline std::string to_string(const std::time_t & time)
{
std::stringstream ss;
ss << std::put_time(std::localtime(&time), "%Y-%m-%d %X");
return ss.str();
}
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);
}
}