|static tick_count now()||
Current wall clock timestamp.
|static double resolution()||
The resolution of the clock in seconds.
|tick_count::interval_t operator-( const tick_count& t1, const tick_count& t0 )||
Relative time that t1 occurred after t0.
On Microsoft Windows* operating systems, the current implementation uses the function QueryPerformanceCounter. Some systems may have bugs in their basic input/output system (BIOS) or hardware abstraction layer (HAL) that cause different processors to return different time results.