| Qwt User's Guide
    6.1.3
    | 
QwtSystemClock provides high resolution clock time functions. More...
#include <qwt_system_clock.h>
| Public Member Functions | |
| QwtSystemClock () | |
| Constructs a null clock object. | |
| virtual | ~QwtSystemClock () | 
| Destructor. | |
| bool | isNull () const | 
| void | start () | 
| double | restart () | 
| double | elapsed () const | 
QwtSystemClock provides high resolution clock time functions.
Sometimes the resolution offered by QTime ( millisecond ) is not accurate enough for implementing time measurements ( f.e. sampling ). QwtSystemClock offers a subset of the QTime functionality using higher resolution timers ( if possible ).
Precision and time intervals are multiples of milliseconds (ms).
| double QwtSystemClock::elapsed | ( | ) | const | 
| bool QwtSystemClock::isNull | ( | ) | const | 
| double QwtSystemClock::restart | ( | ) | 
Set the start time to the current time
| void QwtSystemClock::start | ( | ) | 
Sets the start time to the current time.