48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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* Qwt Widget Library
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* Copyright (C) 1997 Josef Wilgen
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* Copyright (C) 2002 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#ifndef QWT_SYSTEM_CLOCK_H
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#define QWT_SYSTEM_CLOCK_H
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#include "qwt_global.h"
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/*!
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\brief QwtSystemClock provides high resolution clock time functions.
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Sometimes the resolution offered by QTime ( millisecond ) is not accurate
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enough for implementing time measurements ( f.e. sampling ).
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QwtSystemClock offers a subset of the QTime functionality using higher
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resolution timers ( if possible ).
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Precision and time intervals are multiples of milliseconds (ms).
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\note The implementation uses high-resolution performance counter on Windows,
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mach_absolute_time() on the Mac or POSIX timers on other systems.
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If none is available it falls back on QTimer.
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*/
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class QWT_EXPORT QwtSystemClock
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{
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public:
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QwtSystemClock();
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virtual ~QwtSystemClock();
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bool isNull() const;
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void start();
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double restart();
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double elapsed() const;
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private:
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class PrivateData;
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PrivateData *d_data;
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};
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#endif
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