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<h1>QwtSystemClock Class Reference</h1>  </div>
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<p><a class="el" href="class_qwt_system_clock.html" title="QwtSystemClock provides high resolution clock time functions.">QwtSystemClock</a> provides high resolution clock time functions.  
<a href="#_details">More...</a></p>

<p><code>#include &lt;<a class="el" href="qwt__system__clock_8h_source.html">qwt_system_clock.h</a>&gt;</code></p>

<p><a href="class_qwt_system_clock-members.html">List of all members.</a></p>
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Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_system_clock.html#a0baae39a5a9d4f4e8bf3a8bd308a6dad">elapsed</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_system_clock.html#a5432c09607488f9bb7e3d7592518efb1">isNull</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_system_clock.html#a384e20d6049376575bf28306154854fd">QwtSystemClock</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_system_clock.html#a6be327dd133c1d7ecccfb95050eef7b9">restart</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_system_clock.html#a3408bd55b49582f7847865aacc7beb37">start</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_system_clock.html#a79a46a34a317543a08a8424a333b9ee3">~QwtSystemClock</a> ()</td></tr>
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Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_system_clock.html#a1653b12f0f9a4fac9a437d516fd177ab">precision</a> ()</td></tr>
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<hr/><a name="_details"></a><h2>Detailed Description</h2>
<div class="textblock"><p><a class="el" href="class_qwt_system_clock.html" title="QwtSystemClock provides high resolution clock time functions.">QwtSystemClock</a> provides high resolution clock time functions. </p>
<p>Sometimes the resolution offered by QTime ( millisecond ) is not accurate enough for implementing time measurements ( f.e. sampling ). <a class="el" href="class_qwt_system_clock.html" title="QwtSystemClock provides high resolution clock time functions.">QwtSystemClock</a> offers a subset of the QTime functionality using higher resolution timers ( if possible ).</p>
<p>Precision and time intervals are multiples of milliseconds (ms).</p>
<dl class="note"><dt><b>Note:</b></dt><dd>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. </dd></dl>
</div><hr/><h2>Constructor &amp; Destructor Documentation</h2>
<a class="anchor" id="a384e20d6049376575bf28306154854fd"></a><!-- doxytag: member="QwtSystemClock::QwtSystemClock" ref="a384e20d6049376575bf28306154854fd" args="()" -->
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          <td class="memname">QwtSystemClock::QwtSystemClock </td>
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<p>Constructs a null clock object. </p>

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          <td class="memname">QwtSystemClock::~QwtSystemClock </td>
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          <td><code> [virtual]</code></td>
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<p>Destructor. </p>

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<hr/><h2>Member Function Documentation</h2>
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          <td class="memname">double QwtSystemClock::elapsed </td>
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          <td> const</td>
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<dl class="return"><dt><b>Returns:</b></dt><dd>Number of milliseconds that have elapsed since the last time <a class="el" href="class_qwt_system_clock.html#a3408bd55b49582f7847865aacc7beb37">start()</a> or <a class="el" href="class_qwt_system_clock.html#a6be327dd133c1d7ecccfb95050eef7b9">restart()</a> was called or 0.0 for null clocks. </dd></dl>

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<dl class="return"><dt><b>Returns:</b></dt><dd>true if the clock has never been started. </dd></dl>

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          <td class="memname">double QwtSystemClock::precision </td>
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          <td><code> [static]</code></td>
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<dl class="return"><dt><b>Returns:</b></dt><dd>Accuracy of the system clock in milliseconds. </dd></dl>

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          <td class="memname">double QwtSystemClock::restart </td>
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<p>The start time to the current time and return the time, that is elapsed since the previous start time. </p>

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          <td class="memname">void QwtSystemClock::start </td>
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<p>Sets the start time to the current time. </p>

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