High resolution UTC

hires_utc_clock is a std::chrono clock. This is a clock with 1ns resolution, but its actual precision is based on the clock of the operating system:

• POSIX clock_gettime(CLOCK_REALTIME)
• Windows 10 GetSystemTimeAsFileTime()
• macOS/iOS gettimeofday()

During leap-seconds the UTC clock may slew or jump depending on how the operating system clock operates.

High performance Continues-UTC

hiperf_cutc_clock is a std::chrono clock. This is a clock with 1ns resolution, but its actual precision is based on a CPU counter and disciplined with hires_utc_clock.

If hires_utc_clock jumps during a leap second then hiperf_cutc_clock will filter out the leap second and keep counting as if there has not been a leap second. A leapsecond_offset attribute tracks the detected jumps.

If hires_utc_clock slews during the leap second then hiperf_cutc_clock will slew with it.