source: ntrip/trunk/BNC/qwt/qwt_system_clock.h@ 5296

Last change on this file since 5296 was 4271, checked in by mervart, 12 years ago
File size: 1.3 KB
RevLine 
[4271]1/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
2 * Qwt Widget Library
3 * Copyright (C) 1997 Josef Wilgen
4 * Copyright (C) 2002 Uwe Rathmann
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the Qwt License, Version 1.0
8 *****************************************************************************/
9
10#ifndef QWT_SYSTEM_CLOCK_H
11#define QWT_SYSTEM_CLOCK_H
12
13#include "qwt_global.h"
14
15/*!
16 \brief QwtSystemClock provides high resolution clock time functions.
17
18 Sometimes the resolution offered by QTime ( millisecond ) is not accurate
19 enough for implementing time measurements ( f.e. sampling ).
20 QwtSystemClock offers a subset of the QTime functionality using higher
21 resolution timers ( if possible ).
22
23 Precision and time intervals are multiples of milliseconds (ms).
24
25 \note The implementation uses high-resolution performance counter on Windows,
26 mach_absolute_time() on the Mac or POSIX timers on other systems.
27 If none is available it falls back on QTimer.
28*/
29
30class QWT_EXPORT QwtSystemClock
31{
32public:
33 QwtSystemClock();
34 virtual ~QwtSystemClock();
35
36 bool isNull() const;
37
38 void start();
39 double restart();
40 double elapsed() const;
41
42 static double precision();
43
44private:
45 class PrivateData;
46 PrivateData *d_data;
47};
48
49#endif
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