std::chrono::gps_clock
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gps_clock
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std::chrono::gps_clock
Member functions
Time point I/O
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 behind GPS. As of December 2017, UTC is 18 seconds behind GPS, reflecting the 18 leap seconds inserted between 1980 and 2017. Thus, 2018年01月01日 00:00:00 UTC is equivalent to 2018年01月01日 00:00:18 GPS. GPS is a constant 19 seconds behind TAI.
gps_clock meets the Clock requirements. It does not meet the TrivialClock requirements unless the implementation can guarantee that now() does not throw an exception.
Time point family
Defined in namespace
std::chronotemplate<class Duration>
using gps_time = std::chrono::time_point <std::chrono::gps_clock, Duration>;
(since C++20)
using gps_time = std::chrono::time_point <std::chrono::gps_clock, Duration>;
using gps_seconds = gps_time<std::chrono::seconds >;
(since C++20)
[edit] Member types
Member type
Definition
rep
signed arithmetic type representing the number of ticks in the clock's duration
period
a std::ratio type representing the tick period of the clock, in seconds
duration
std::chrono::duration <rep, period>, capable of representing negative durations
time_point
std::chrono::time_point <std::chrono::gps_clock>
[edit] Member constants
constexpr bool is_steady
[static]
(public static member constant)
[edit] Member functions
[static]
(public static member function) [edit]