The latest version of this topic can be found at steady_clock struct.
On Windows, steady_clock wraps the QueryPerformanceCounter function.
A clock is monotonic if the value that is returned by a first call to
now() is always less than or equal to the value that is returned by a subsequent call to
A clock is steady if it is monotonic and if the time between clock ticks is constant.
High_resolution_clock is a typdef for steady_clock.
|now||Returns the current time as a time_point value.|