Public Member Functions
Constructs a null clock object.
virtual ~QwtSystemClock ()
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).
( QwtSystemClock is obsolete since Qt 4.8 as QElapsedTimer offers the same precision )
The implementation uses high-resolution performance counter on Windows, mach_absolute_time() on the Mac or POSIX timers on other systems. If none is available it falls back on QTimer.
Member Function Documentation
double QwtSystemClock::elapsed () const
Number of milliseconds that have elapsed since the last time start() or restart() was called or 0.0 for null clocks.
bool QwtSystemClock::isNull () const
true if the clock has never been started.
double QwtSystemClock::restart ()
Set the start time to the current time
Time, that is elapsed since the previous start time.
void QwtSystemClock::start ()
Sets the start time to the current time.
Generated automatically by Doxygen for Qwt User's Guide from the source code.