Create a duration from a signed 64-bit microsecond count.
durationCopy a duration independently of the source object.
sourceReturn the exact signed 64-bit microsecond count.
Return whole milliseconds, truncated toward zero and converted to a signed 32-bit integer.
Return the seconds, rounded to float32 precision.
std::chrono::microseconds is represented by a microsecond bigint.
A signed microsecond duration; native APIs receive its bigint by value.