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<li class="navelem"><a class="el" href="namespaceCairo.html">Cairo</a></li><li class="navelem"><a class="el" href="classCairo_1_1Device.html">Device</a></li><li class="navelem"><a class="el" href="classCairo_1_1Device_1_1Lock.html">Lock</a></li> </ul>
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<div class="title">Cairo::Device::Lock Class Reference</div> </div>
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<p>A convenience class for acquiring a <a class="el" href="classCairo_1_1Device.html" title="Devices are the abstraction Cairo employs for the rendering system used by a cairo_surface_t. ">Device</a> object in an exception-safe manner.
<a href="classCairo_1_1Device_1_1Lock.html#details">More...</a></p>
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Public Member Functions</h2></td></tr>
<tr class="memitem:a7a376f275131519394fb4256418ee607"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classCairo_1_1Device_1_1Lock.html#a7a376f275131519394fb4256418ee607">Lock</a> (const <a class="el" href="classCairo_1_1RefPtr.html">RefPtr</a>< <a class="el" href="classCairo_1_1Device.html">Device</a> >& device)</td></tr>
<tr class="memdesc:a7a376f275131519394fb4256418ee607"><td class="mdescLeft"> </td><td class="mdescRight">Create a new <a class="el" href="classCairo_1_1Device.html" title="Devices are the abstraction Cairo employs for the rendering system used by a cairo_surface_t. ">Device</a> lock for <em>device</em>. <a href="#a7a376f275131519394fb4256418ee607">More...</a><br /></td></tr>
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<tr class="memitem:ac717b4a10ad681aae711c852e0824571"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classCairo_1_1Device_1_1Lock.html#ac717b4a10ad681aae711c852e0824571">Lock</a> (const <a class="el" href="classCairo_1_1Device_1_1Lock.html">Lock</a>& other)</td></tr>
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<tr class="memitem:a0a5e7c6b770589a05554ebae5681ed10"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classCairo_1_1Device_1_1Lock.html#a0a5e7c6b770589a05554ebae5681ed10">~Lock</a> ()</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A convenience class for acquiring a <a class="el" href="classCairo_1_1Device.html" title="Devices are the abstraction Cairo employs for the rendering system used by a cairo_surface_t. ">Device</a> object in an exception-safe manner. </p>
<p>The device is automatically acquired when a <a class="el" href="classCairo_1_1Device_1_1Lock.html" title="A convenience class for acquiring a Device object in an exception-safe manner. ">Lock</a> object is created and released when the <a class="el" href="classCairo_1_1Device_1_1Lock.html" title="A convenience class for acquiring a Device object in an exception-safe manner. ">Lock</a> object is destroyed. For example:</p>
<div class="fragment"><div class="line"><span class="keywordtype">void</span></div>
<div class="line">my_device_modifying_function (<span class="keyword">const</span> RefPtr<Device>& device)</div>
<div class="line">{</div>
<div class="line"> <span class="comment">// Ensure the device is properly reset</span></div>
<div class="line"> device->flush();</div>
<div class="line"></div>
<div class="line"> Device::Lock <a class="codeRef" doxygen="libstdc++.tag:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01650.html#ga24630a7020b341d48604f46e9eb210cd">lock</a>(device);</div>
<div class="line"> <span class="comment">// Do the custom operations on the device here.</span></div>
<div class="line"> <span class="comment">// But do not call any Cairo functions that might acquire devices.</span></div>
<div class="line"></div>
<div class="line">} <span class="comment">// device is automatically released at the end of the function scope</span></div>
</div><!-- fragment --> </div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<td class="memname">Cairo::Device::Lock::Lock </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classCairo_1_1RefPtr.html">RefPtr</a>< <a class="el" href="classCairo_1_1Device.html">Device</a> >& </td>
<td class="paramname"><em>device</em></td><td>)</td>
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<p>Create a new <a class="el" href="classCairo_1_1Device.html" title="Devices are the abstraction Cairo employs for the rendering system used by a cairo_surface_t. ">Device</a> lock for <em>device</em>. </p>
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<td class="memname">Cairo::Device::Lock::Lock </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classCairo_1_1Device_1_1Lock.html">Lock</a>& </td>
<td class="paramname"><em>other</em></td><td>)</td>
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<td class="memname">Cairo::Device::Lock::~Lock </td>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>cairomm/device.h</li>
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