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- .TH "QwtSystemClock" 3 "Mon Dec 28 2020" "Version 6.1.6" "Qwt User's Guide" \" -*- nroff -*-
- .ad l
- .nh
- .SH NAME
- QwtSystemClock \- \fBQwtSystemClock\fP provides high resolution clock time functions\&.
- .SH SYNOPSIS
- .br
- .PP
- .PP
- \fC#include <qwt_system_clock\&.h>\fP
- .SS "Public Member Functions"
- .in +1c
- .ti -1c
- .RI "\fBQwtSystemClock\fP ()"
- .br
- .RI "Constructs a null clock object\&. "
- .ti -1c
- .RI "virtual \fB~QwtSystemClock\fP ()"
- .br
- .RI "Destructor\&. "
- .ti -1c
- .RI "bool \fBisNull\fP () const"
- .br
- .ti -1c
- .RI "void \fBstart\fP ()"
- .br
- .ti -1c
- .RI "double \fBrestart\fP ()"
- .br
- .ti -1c
- .RI "double \fBelapsed\fP () const"
- .br
- .in -1c
- .SH "Detailed Description"
- .PP
- \fBQwtSystemClock\fP provides high resolution clock time functions\&.
- Sometimes the resolution offered by QTime ( millisecond ) is not accurate enough for implementing time measurements ( f\&.e\&. sampling )\&. \fBQwtSystemClock\fP offers a subset of the QTime functionality using higher resolution timers ( if possible )\&.
- .PP
- Precision and time intervals are multiples of milliseconds (ms)\&.
- .PP
- ( \fBQwtSystemClock\fP is obsolete since Qt 4\&.8 as QElapsedTimer offers the same precision )
- .PP
- \fBNote\fP
- .RS 4
- 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\&.
- .RE
- .PP
- .SH "Member Function Documentation"
- .PP
- .SS "double QwtSystemClock::elapsed () const"
- .PP
- \fBReturns\fP
- .RS 4
- Number of milliseconds that have elapsed since the last time \fBstart()\fP or \fBrestart()\fP was called or 0\&.0 for null clocks\&.
- .RE
- .PP
- .SS "bool QwtSystemClock::isNull () const"
- .PP
- \fBReturns\fP
- .RS 4
- true if the clock has never been started\&.
- .RE
- .PP
- .SS "double QwtSystemClock::restart ()"
- Set the start time to the current time
- .PP
- \fBReturns\fP
- .RS 4
- Time, that is elapsed since the previous start time\&.
- .RE
- .PP
- .SS "void QwtSystemClock::start ()"
- Sets the start time to the current time\&.
- .SH "Author"
- .PP
- Generated automatically by Doxygen for Qwt User's Guide from the source code\&.
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