Linux Manuals session 3

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…

std::chrono::tai_clock::to_utc – std::chrono::tai_clock::to_utc Synopsis template <class Duration> static std::chrono::utc_time<std::common_type_t<Duration, std::chrono::seconds>>(since C++ 20) to_utc(const std::chrono::tai_time<Duration> &t) noexcept; Converts the tai_time t to a utc_time representing the same point in time. Return value A std::chrono::utc_time representing the same point in time as t, computed as if by constructing a value of the return type from t.time_since_epoch() and…

std::chrono::tai_clock::now – std::chrono::tai_clock::now Synopsis static std::chrono::time_point<std::chrono::tai_clock> now(); (since C++20) Returns a time point representing the current point in time. The result is calculated as if by std::chrono::tai_clock::from_utc(std::chrono::utc_clock::now()). Implementations may use a more accurate value of TAI time. Parameters (none) Return value A time point representing the current time. Example // Run this code #include <iostream>…

std::chrono::tai_clock::from_utc – std::chrono::tai_clock::from_utc Synopsis template <class Duration> static std::chrono::tai_time<std::common_type_t<Duration, std::chrono::seconds>>(since C++ 20) from_utc(const std::chrono::utc_time<Duration> &) noexcept; Converts the utc_time t to a tai_time representing the same point in time. Return value A std::chrono::tai_time representing the same point in time as t, computed as if by constructing a value of the return type from t.time_since_epoch() and…

std::chrono::tai_clock – std::chrono::tai_clock Synopsis Defined in header <chrono> class tai_clock; (since C++20) The clock std::chrono::tai_clock is a Clock that represents International Atomic Time (TAI). It measures time since 00:00:00, 1 January 1958, and is offset 10 seconds ahead of UTC at that date (i.e., its epoch, 1958-01-01 00:00:00 TAI, is 1957-12-31 23:59:50 UTC). Leap seconds…

std::chrono::system_clock::to_time_t – std::chrono::system_clock::to_time_t Synopsis static std::time_t to_time_t(const time_point &t) noexcept; (since C++ 11) Converts t to a std::time_t type. If std::time_t has lower precision, it is implementation-defined whether the value is rounded or truncated. Parameters t – system clock time point to convert Return value A std::time_t value representing t. See also from_time_t converts std::time_t…

std::chrono::system_clock::now – std::chrono::system_clock::now Synopsis static std::chrono::time_point<std::chrono::system_clock> now() noexcept; (since C++11) Returns a time point representing the current point in time. Parameters (none) Return value A time point representing the current time. Example // Run this code #include <iostream> #include <vector> #include <numeric> #include <chrono> volatile int sink; int main() { for (auto size = 1ull;…

std::chrono::system_clock::from_time_t – std::chrono::system_clock::from_time_t Synopsis static std::chrono::system_clock::time_point from_time_t( std::time_t t ) noexcept; (since C++11) Converts t to a time point type, using the coarser precision of the two types. If time_point has lower precision, it is implementation defined whether the value is rounded or truncated. Parameters t – std::time_t value to convert Return value A value…

std::chrono::system_clock – std::chrono::system_clock Synopsis Defined in header <chrono> class system_clock; (since C++11) Class std::chrono::system_clock represents the system-wide real time wall clock. It may not be monotonic: on most systems, the system time can be adjusted at any moment. It is the only C++ clock that has the ability to map its time points to C-style…

std::chrono::sys_info – std::chrono::sys_info Synopsis Defined in header <chrono> struct sys_info; (since C++20) The class sys_info describes time zone information associated with a time zone at a particular point in time (represented as either a std::chrono::sys_time or a std::chrono::local_time). This is a low-level data structure typically not used directly by user code. Member objects Member object…

std::chrono::steady_clock::now – std::chrono::steady_clock::now Synopsis static std::chrono::time_point<std::chrono::steady_clock> now() noexcept; (since C++11) Returns a time point representing the current point in time. Parameters (none) Return value A time point representing the current time. Example // Run this code #include <iostream> #include <vector> #include <numeric> #include <chrono> volatile int sink; int main() { for (auto size = 1ull;…

std::chrono::steady_clock – std::chrono::steady_clock Synopsis Defined in header <chrono> class steady_clock; (since C++11) Class std::chrono::steady_clock represents a monotonic clock. The time points of this clock cannot decrease as physical time moves forward and the time between ticks of this clock is constant. This clock is not related to wall clock time (for example, it can be…

std::chrono::round(std::chrono::time_point) – std::chrono::round(std::chrono::time_point) Synopsis Defined in header<chrono> template <class ToDuration, class Clock, class Duration> (since C++ 17) constexpr time_point<Clock, ToDuration> round(const time_point<Clock, Duration> &tp); Returns the nearest time point to tp representable in ToDuration, rounding to even in halfway cases. The function does not participate in the overload resolution unless ToDuration is an specialization of…

std::chrono::round(std::chrono::duration) – std::chrono::round(std::chrono::duration) Synopsis Defined in header<chrono> template <class ToDuration, class Rep, class Period> (since C++ 17) constexpr ToDuration round(const duration<Rep, Period> &d); Returns the value t representable in ToDuration that is the closest to d. If there are two such values, returns the even value (that is, the value t such that t %…

std::chrono::parse – std::chrono::parse Synopsis template <class CharT, class Traits, class Alloc, class Parsable> (1)(since C++ 20) /* unspecified */ parse(const std::basic_string<CharT, Traits, Alloc> &fmt, Parsable &tp); template <class CharT, class Traits, class Alloc, class Parsable> /* unspecified */ parse(const std::basic_string<CharT, Traits, Alloc> &fmt, Parsable &tp, (2)(since C++ 20) std::basic_string<CharT, Traits, Alloc> &abbrev); template <class CharT,…

std::chrono::operator==,!=,<,<=,>,>=(std::chrono::year_month_day_last) – std::chrono::operator==,!=,<,<=,>,>=(std::chrono::year_month_day_last) Synopsis constexpr bool operator==(const std::chrono::year_month_day_last &x, (1)(since C++ 20) const std::chrono::year_month_day_last &y) noexcept; constexpr bool operator!=(const std::chrono::year_month_day_last &x, (2)(since C++ 20) const std::chrono::year_month_day_last &y) noexcept; constexpr bool operator<(const std::chrono::year_month_day_last &x, (3)(since C++ 20) const std::chrono::year_month_day_last &y) noexcept; constexpr bool operator>(const std::chrono::year_month_day_last &x, (4)(since C++ 20) const std::chrono::year_month_day_last &y) noexcept; constexpr bool operator<=(const…

std::chrono::operator+,std::chrono::operator-(std::chrono::year_month_weekday_last) – std::chrono::operator+,std::chrono::operator-(std::chrono::year_month_weekday_last) Synopsis constexpr std::chrono::year_month_weekday_last operator+(const std::chrono::year_month_weekday_last &ymwdl, (since C++ 20) const std::chrono::months &dm) noexcept; constexpr std::chrono::year_month_weekday_last operator+(const std::chrono::months &dm, (since C++ 20) const std::chrono::year_month_weekday_last &ymwdl) noexcept; constexpr std::chrono::year_month_weekday_last operator+(const std::chrono::year_month_weekday_last &ymwdl, (since C++ 20) const std::chrono::years &dy) noexcept; constexpr std::chrono::year_month_weekday_last operator+(const std::chrono::years &dy, (since C++ 20) const std::chrono::year_month_weekday_last &ymwdl) noexcept; constexpr std::chrono::year_month_weekday_last operator-(const…