The Linux Manuals (man pages) document is an important part of Linux documents. Linux Manuals are organized as several sections. Each section has a group of commands for a specific area in Linux usage, administration or development.
std::chrono::link – std::chrono::link Synopsis Defined in header <chrono> class link; (since C++20) The class link represents an alternative name for a time zone. Users cannot construct link objects. The library implementation creates link objects when it initializes the time zone database and provides const access to these objects. link is not copyable but does have…
std::chrono::leap::date – std::chrono::leap::date Synopsis constexpr std::chrono::sys_seconds date() const noexcept; Obtains the date and time of the leap second insertion. Return value A std::chrono::sys_seconds representing the date and time at which the leap second was inserted.
std::chrono::leap – std::chrono::leap Synopsis Defined in header <chrono> class leap; (since C++20) The class leap represents the date and time of a leap second insertion. Users cannot construct leap objects except by copying from existing leap objects. The library implementation creates leap objects when it initializes the time zone database and provides const access to…
std::chrono::last_spec – std::chrono::last_spec Synopsis Defined in header<chrono> struct last_spec { (since C++ 20) explicit last_spec() = default; }; inline constexpr last_spec last{}; (since C++ 20) last_spec is an empty tag type that is used in conjunction with other calendar types to indicate the last thing in a sequence. Depending on context, it may indicate the…
std::chrono::is_clock – std::chrono::is_clock Synopsis Defined in header<chrono> template <class T> struct is_clock; If T satisfies the Clock requirements, provides the member constant value equal true. For any other type, value is false. For the purpose of this trait, the extent to which an implementation determines that a type cannot meet the Clock requirements is unspecified,…
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…