SysTutorials Posts

std::chrono::to_stream(std::chrono::sys_time) – std::chrono::to_stream(std::chrono::sys_time) Synopsis template <class CharT, class Traits, class Duration> std::basic_ostream<CharT, Traits> &(since C++ 20) to_stream(std::basic_ostream<CharT, Traits> &os, const CharT *fmt, const std::chrono::sys_time<Duration> &tp); Outputs tp to the stream os, formatted according to the null-terminated format string fmt. If %Z is used, it is replaced with "UTC" widened to CharT. If %z or a…

std::chrono::to_stream(std::chrono::month_day) – std::chrono::to_stream(std::chrono::month_day) Synopsis template <class CharT, class Traits> std::basic_ostream<CharT, Traits> &(since C++ 20) to_stream(std::basic_ostream<CharT, Traits> &os, const CharT *fmt, const std::chrono::month_day &md); Outputs md to the stream os, formatted according to the null-terminated format string fmt. Format string The format string consists of zero or more conversion specifiers and ordinary characters. All ordinary characters,…

std::chrono::to_stream(std::chrono::month) – std::chrono::to_stream(std::chrono::month) Synopsis template <class CharT, class Traits> std::basic_ostream<CharT, Traits> &(since C++ 20) to_stream(std::basic_ostream<CharT, Traits> &os, const CharT *fmt, const std::chrono::month &m); Outputs m to the stream os, formatted according to the null-terminated format string fmt. Format string The format string consists of zero or more conversion specifiers and ordinary characters. All ordinary characters,…

std::chrono::to_stream(std::chrono::local_time) – std::chrono::to_stream(std::chrono::local_time) Synopsis template <class CharT, class Traits, class Duration> std::basic_ostream<CharT, Traits> & to_stream(std::basic_ostream<CharT, Traits> &os, const CharT *fmt, (since C++ 20) const std::chrono::local_time<Duration> &tp, const std::string *abbrev = nullptr, const std::chrono::seconds *offset_sec = nullptr); Outputs tp to the stream os, formatted according to the null-terminated format string fmt. If %Z is used, it…

std::chrono::to_stream(std::chrono::gps_time) – std::chrono::to_stream(std::chrono::gps_time) Synopsis template <class CharT, class Traits, class Duration> std::basic_ostream<CharT, Traits> &(since C++ 20) to_stream(std::basic_ostream<CharT, Traits> &os, const CharT *fmt, const std::chrono::gps_time<Duration> &tp); Outputs tp to the stream os, formatted according to the null-terminated format string fmt. If %Z is used, it is replaced with "GPS" widened to CharT. If %z or a…

std::chrono::to_stream(std::chrono::file_time) – std::chrono::to_stream(std::chrono::file_time) Synopsis template <class CharT, class Traits, class Duration> std::basic_ostream<CharT, Traits> &(since C++ 20) to_stream(std::basic_ostream<CharT, Traits> &os, const CharT *fmt, const std::chrono::file_time<Duration> &tp); Outputs tp to the stream os, formatted according to the null-terminated format string fmt. If %Z is used, it is replaced with "UTC" widened to CharT. If %z or a…

std::chrono::to_stream(std::chrono::duration) – std::chrono::to_stream(std::chrono::duration) Synopsis template <class CharT, class Traits, class Rep, class Period> std::basic_ostream<CharT, Traits> &(since C++ 20) to_stream(std::basic_ostream<CharT, Traits> &os, const CharT *fmt, const std::chrono::duration<Rep, Period> &d); Outputs d (interpreted as a time of day since midnight) to the stream os, formatted according to the null-terminated format string fmt. Format string The format string…

std::chrono::to_stream(std::chrono::day) – std::chrono::to_stream(std::chrono::day) Synopsis template <class CharT, class Traits> std::basic_ostream<CharT, Traits> &(since C++ 20) to_stream(std::basic_ostream<CharT, Traits> &os, const CharT *fmt, const std::chrono::day &d); Outputs d to the stream os, formatted according to the null-terminated format string fmt. Format string The format string consists of zero or more conversion specifiers and ordinary characters. All ordinary characters,…

std::chrono::time_zone::to_sys – std::chrono::time_zone::to_sys Synopsis template <class Duration> auto to_sys(const std::chrono::local_time<Duration> &tp) const(since C++ 20) -> std::chrono::sys_time<std::common_type_t<Duration, std::chrono::seconds>>; template <class Duration> auto to_sys(const std::chrono::local_time<Duration> &tp, std::chrono::choose z) const(since C++ 20) -> std::chrono::sys_time<std::common_type_t<Duration, std::chrono::seconds>>; Converts the local_time tp in this time zone to the corresponding sys_time. 1) Throws an exception if the conversion is ambiguous or if…

std::chrono::time_zone::to_local – std::chrono::time_zone::to_local Synopsis template <class Duration> auto to_local(const std::chrono::sys_time<Duration> &tp) const(since C++ 20) -> std::chrono::local_time<std::common_type_t<Duration, std::chrono::seconds>>; Converts the sys_time tp to the corresponding local_time in this time zone. Return value The local_time associated with tp and this time zone. Notes The precision of the result is at least std::chrono::seconds, and will be finer if…

std::chrono::time_zone::name – std::chrono::time_zone::name Synopsis std::string_view name() const noexcept; (since C++20) Obtains the name of this time zone. Return value The name of this time zone (e.g., "America/New_York").

std::chrono::time_zone::get_info – std::chrono::time_zone::get_info Synopsis template <class Duration> (since C++ 20) std::chrono::sys_info get_info(const std::chrono::sys_time<Duration> &tp) const; template <class Duration> (since C++ 20) std::chrono::local_info get_info(const std::chrono::local_time<Duration> &tp) const; Obtains information about this time zone at the time point tp. Return value 1) A std::chrono::sys_info structure i containing the time zone information in effect for this time zone…

std::chrono::time_zone – std::chrono::time_zone Synopsis Defined in header <chrono> class time_zone; (since C++20) The class time_zone represents all time zone transitions for a specific geographic area. Users cannot construct time_zone objects. The library implementation creates time_zone objects when it initializes the time zone database and provides const access to these objects. time_zone is not copyable but…

std::chrono::time_point_cast – std::chrono::time_point_cast Synopsis template <class ToDuration, class Clock, class Duration> (since C++ 11) time_point<Clock, ToDuration> time_point_cast((until C++ 14) const time_point<Clock, Duration> &t); template <class ToDuration, class Clock, class Duration> constexpr time_point<Clock, ToDuration> time_point_cast((since C++ 14) const time_point<Clock, Duration> &t); Converts a std::chrono::time_point from one duration to another. Parameters t – time_point to convert from…

std::chrono::time_point<Clock,Duration>::time_since_epoch – std::chrono::time_point<Clock,Duration>::time_since_epoch Synopsis duration time_since_epoch() const; (since C++11)                                               (until C++14) constexpr duration time_since_epoch() const; (since C++14) Returns a duration representing the amount of time between *this and the clock’s epoch. Parameters (none) Return value The amount of time between this time_point and the clock’s epoch Example // Run this code #include <iostream> #include <chrono>…

std::chrono::time_of_day<Duration>::time_of_day – std::chrono::time_of_day<Duration>::time_of_day Synopsis time_of_day() = default; (1) explicit constexpr time_of_day(precision since_midnight) noexcept; (2) Constructs a time_of_day object. 1) Default constructor leaves the object uninitialized. 2) Constructs a time_of_day object in 24 hour format corresponding to since_midnight after 00:00:00. As applicable: * hours() returns the integral number of hours since_midnight is after 00:00:00. * minutes()…

std::chrono::time_of_day<Duration>::operatorprecision,std::chrono::time_of_day<Duration>::to_duration – std::chrono::time_of_day<Duration>::operatorprecision,std::chrono::time_of_day<Duration>::to_duration Synopsis constexpr explicit operator precision() const noexcept; (1) constexpr precision to_duration() const noexcept; (2) Returns the stored duration. Return value The stored duration.

std::chrono::time_of_day<Duration>::make12,std::chrono::time_of_day<Duration>::make24 – std::chrono::time_of_day<Duration>::make12,std::chrono::time_of_day<Duration>::make24 Synopsis constexpr void make12() noexcept; (1) constexpr void make24() noexcept; (2) Changes the output format. 1) If the current output format is 24-hour, converts to 12-hour time. Otherwise no effects. 2) If the current output format is 12-hour, converts to 24-hour time. Otherwise no effects. Notes It is not possible to query…

std::chrono::time_of_day<Duration>::hours,std::chrono::time_of_day<Duration>::minutes, – std::chrono::time_of_day<Duration>::hours,std::chrono::time_of_day<Duration>::minutes, Synopsis              std::chrono::time_of_day<Duration>::subseconds member of all specializations constexpr std::chrono::hours hours() const noexcept;                            (1) member of all specializations except time_of_day<std::chrono::hours> constexpr std::chrono::minutes minutes() const noexcept;                        (2) member only of the time_of_day<std::chrono::seconds> and time_of_day<std::chrono::duration<Rep, Period>> specializations constexpr std::chrono::seconds seconds() const noexcept;                        (3) member only of the time_of_day<std::chrono::duration<Rep, Period>> partial specialization constexpr precision subseconds() const noexcept;                                (4) Obtains the components of the stored "broken down" time. Return value Let…

std::chrono::time_of_day – std::chrono::time_of_day Synopsis Defined in header <chrono> template< class Duration > (1) (since C++20) class time_of_day; // not defined template<> (2) (since C++20) class time_of_day<std::chrono::hours>; template<> (3) (since C++20) class time_of_day<std::chrono::minutes>; template<> (4) (since C++20) class time_of_day<std::chrono::seconds>; template< class Rep, class Period > (5) (since C++20) class time_of_day<std::chrono::duration<Rep, Period>>; The class template time_of_day splits…