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47 lines
1.3 KiB
47 lines
1.3 KiB
/* -*- 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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