Linux Manuals session 3

std::chrono::high_resolution_clock::now – std::chrono::high_resolution_clock::now Synopsis static std::chrono::time_point<std::chrono::high_resolution_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::high_resolution_clock – std::chrono::high_resolution_clock Synopsis Defined in header <chrono> class high_resolution_clock; (since C++11) Class std::chrono::high_resolution_clock represents the clock with the smallest tick period provided by the implementation. It may be an alias of std::chrono::system_clock or std::chrono::steady_clock, or a third, independent clock. std::chrono::high_resolution_clock meets the requirements of TrivialClock. Member types Member type Definition rep arithmetic type representing…

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

std::chrono::gps_clock::from_utc – std::chrono::gps_clock::from_utc Synopsis template <class Duration> static std::chrono::gps_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 gps_time representing the same point in time. Return value A std::chrono::gps_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::gps_clock – std::chrono::gps_clock Synopsis Defined in header <chrono> class gps_clock; (since C++20) The clock std::chrono::gps_clock is a Clock that represents Global Positioning System (GPS) time. It measures time since 00:00:00, 6 January 1980 UTC. Leap seconds are not inserted into GPS. Thus, every time a leap second is inserted into UTC, UTC falls another second…

std::chrono::get_tzdb_list,std::chrono::get_tzdb,std::chrono::remote_version,std::chrono::reload_tzdb – std::chrono::get_tzdb_list,std::chrono::get_tzdb,std::chrono::remote_version,std::chrono::reload_tzdb Synopsis std::chrono::tzdb_list& get_tzdb_list(); (1) (since C++20) const std::chrono::tzdb& get_tzdb(); (2) (since C++20) std::string remote_version(); (3) (since C++20) const std::chrono::tzdb& reload_tzdb(); (4) (since C++20) These functions provide access to the program-wide time zone database. 1) Returns a reference to the global std::chrono::tzdb_list singleton. If this is the first access to the database, initialize…

std::chrono::get_tzdb_list,std::chrono::get_tzdb,std::chrono::remote_version, – std::chrono::get_tzdb_list,std::chrono::get_tzdb,std::chrono::remote_version, Synopsis std::chrono::tzdb_list& get_tzdb_list(); (1) (since C++20) const std::chrono::tzdb& get_tzdb();     (2) (since C++20) std::string remote_version();            (3) (since C++20) const std::chrono::tzdb& reload_tzdb();  (4) (since C++20) These functions provide access to the program-wide time zone database. 1) Returns a reference to the global std::chrono::tzdb_list singleton. If this is the first access to the database, initialize the database. After the initialization, the database will hold a single initialized…

std::chrono::from_stream(std::chrono::year_month_day) – std::chrono::from_stream(std::chrono::year_month_day) Synopsis template <class CharT, class Traits, class Alloc = std::allocator<CharT>> std::basic_istream<CharT, Traits> & from_stream(std::basic_istream<CharT, Traits> &is, const CharT *fmt, (since C++ 20) std::chrono::year_month_day &ymd, std::basic_string<CharT, Traits, Alloc> *abbrev = nullptr, std::chrono::minutes *offset = nullptr); Attempts to parse the input stream is into the std::chrono::year_month_day ymd according to the format string fmt. Behaves…

std::chrono::from_stream(std::chrono::year_month) – std::chrono::from_stream(std::chrono::year_month) Synopsis template <class CharT, class Traits, class Alloc = std::allocator<CharT>> std::basic_istream<CharT, Traits> & from_stream(std::basic_istream<CharT, Traits> &is, const CharT *fmt, (since C++ 20) std::chrono::year_month &ym, std::basic_string<CharT, Traits, Alloc> *abbrev = nullptr, std::chrono::minutes *offset = nullptr); Attempts to parse the input stream is into the std::chrono::year_month ym according to the format string fmt. Behaves…

std::chrono::from_stream(std::chrono::year) – std::chrono::from_stream(std::chrono::year) Synopsis template <class CharT, class Traits, class Alloc = std::allocator<CharT>> std::basic_istream<CharT, Traits> & from_stream(std::basic_istream<CharT, Traits> &is, const CharT *fmt, (since C++ 20) std::chrono::year &y, std::basic_string<CharT, Traits, Alloc> *abbrev = nullptr, std::chrono::minutes *offset = nullptr); Attempts to parse the input stream is into the std::chrono::year y according to the format string fmt. Behaves…

std::chrono::from_stream(std::chrono::weekday) – std::chrono::from_stream(std::chrono::weekday) Synopsis template <class CharT, class Traits, class Alloc = std::allocator<CharT>> std::basic_istream<CharT, Traits> & from_stream(std::basic_istream<CharT, Traits> &is, const CharT *fmt, (since C++ 20) std::chrono::weekday &wd, std::basic_string<CharT, Traits, Alloc> *abbrev = nullptr, std::chrono::minutes *offset = nullptr); Attempts to parse the input stream is into the std::chrono::weekday wd according to the format string fmt. Behaves…

std::chrono::from_stream(std::chrono::utc_time) – std::chrono::from_stream(std::chrono::utc_time) Synopsis template <class CharT, class Traits, class Duration, class Alloc = std::allocator<CharT>> std::basic_istream<CharT, Traits> & from_stream(std::basic_istream<CharT, Traits> &is, const CharT *fmt, (since C++ 20) std::chrono::utc_time<Duration> &tp, std::basic_string<CharT, Traits, Alloc> *abbrev = nullptr, std::chrono::minutes *offset = nullptr); Attempts to parse the input stream is into the time point tp according to the format…

std::chrono::from_stream(std::chrono::tai_time) – std::chrono::from_stream(std::chrono::tai_time) Synopsis template <class CharT, class Traits, class Duration, class Alloc = std::allocator<CharT>> std::basic_istream<CharT, Traits> & from_stream(std::basic_istream<CharT, Traits> &is, const CharT *fmt, (since C++ 20) std::chrono::tai_time<Duration> &tp, std::basic_string<CharT, Traits, Alloc> *abbrev = nullptr, std::chrono::minutes *offset = nullptr); Attempts to parse the input stream is into the time point tp according to the format…

std::chrono::from_stream(std::chrono::sys_time) – std::chrono::from_stream(std::chrono::sys_time) Synopsis template <class CharT, class Traits, class Duration, class Alloc = std::allocator<CharT>> std::basic_istream<CharT, Traits> & from_stream(std::basic_istream<CharT, Traits> &is, const CharT *fmt, (since C++ 20) std::chrono::sys_time<Duration> &tp, std::basic_string<CharT, Traits, Alloc> *abbrev = nullptr, std::chrono::minutes *offset = nullptr); Attempts to parse the input stream is into the time point tp according to the format…

std::chrono::from_stream(std::chrono::month_day) – std::chrono::from_stream(std::chrono::month_day) Synopsis template <class CharT, class Traits, class Alloc = std::allocator<CharT>> std::basic_istream<CharT, Traits> & from_stream(std::basic_istream<CharT, Traits> &is, const CharT *fmt, (since C++ 20) std::chrono::month_day &md, std::basic_string<CharT, Traits, Alloc> *abbrev = nullptr, std::chrono::minutes *offset = nullptr); Attempts to parse the input stream is into the std::chrono::month_day md according to the format string fmt. Behaves…

std::chrono::from_stream(std::chrono::month) – std::chrono::from_stream(std::chrono::month) Synopsis template <class CharT, class Traits, class Alloc = std::allocator<CharT>> std::basic_istream<CharT, Traits> & from_stream(std::basic_istream<CharT, Traits> &is, const CharT *fmt, (since C++ 20) std::chrono::month &m, std::basic_string<CharT, Traits, Alloc> *abbrev = nullptr, std::chrono::minutes *offset = nullptr); Attempts to parse the input stream is into the std::chrono::month m according to the format string fmt. Behaves…

std::chrono::from_stream(std::chrono::local_time) – std::chrono::from_stream(std::chrono::local_time) Synopsis template <class CharT, class Traits, class Duration, class Alloc = std::allocator<CharT>> std::basic_istream<CharT, Traits> & from_stream(std::basic_istream<CharT, Traits> &is, const CharT *fmt, (since C++ 20) std::chrono::local_time<Duration> &tp, std::basic_string<CharT, Traits, Alloc> *abbrev = nullptr, std::chrono::minutes *offset = nullptr); Attempts to parse the input stream is into the time point tp according to the format…

std::chrono::from_stream(std::chrono::gps_time) – std::chrono::from_stream(std::chrono::gps_time) Synopsis template <class CharT, class Traits, class Duration, class Alloc = std::allocator<CharT>> std::basic_istream<CharT, Traits> & from_stream(std::basic_istream<CharT, Traits> &is, const CharT *fmt, (since C++ 20) std::chrono::gps_time<Duration> &tp, std::basic_string<CharT, Traits, Alloc> *abbrev = nullptr, std::chrono::minutes *offset = nullptr); Attempts to parse the input stream is into the time point tp according to the format…

std::chrono::from_stream(std::chrono::file_time) – std::chrono::from_stream(std::chrono::file_time) Synopsis template <class CharT, class Traits, class Duration, class Alloc = std::allocator<CharT>> std::basic_istream<CharT, Traits> & from_stream(std::basic_istream<CharT, Traits> &is, const CharT *fmt, (since C++ 20) std::chrono::file_time<Duration> &tp, std::basic_string<CharT, Traits, Alloc> *abbrev = nullptr, std::chrono::minutes *offset = nullptr); Attempts to parse the input stream is into the time point tp according to the format…