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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>
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<h1>Cairo::Device::Lock Class Reference</h1> </div>
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<!-- doxytag: class="Cairo::Device::Lock" -->
<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="#_details">More...</a></p>
<p><a href="classCairo_1_1Device_1_1Lock-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><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><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"></a><br/></td></tr>
<tr><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>
<tr><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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<hr/><a name="_details"></a><h2>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"><pre class="fragment"> <span class="keywordtype">void</span>
my_device_modifying_function (<span class="keyword">const</span> RefPtr<Device>& device)
{
<span class="comment">// Ensure the device is properly reset</span>
device->flush();
Device::Lock <a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01171.html#ga81b0bd53957243fe2f3148369df00a95">lock</a>(device);
<span class="comment">// Do the custom operations on the device here.</span>
<span class="comment">// But do not call any Cairo functions that might acquire devices.</span>
} <span class="comment">// device is automatically released at the end of the function scope</span>
</pre></div> </div><hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="a7a376f275131519394fb4256418ee607"></a><!-- doxytag: member="Cairo::Device::Lock::Lock" ref="a7a376f275131519394fb4256418ee607" args="(const RefPtr< Device > &device)" -->
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<td class="memname">Cairo::Device::Lock::Lock </td>
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<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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<a class="anchor" id="ac717b4a10ad681aae711c852e0824571"></a><!-- doxytag: member="Cairo::Device::Lock::Lock" ref="ac717b4a10ad681aae711c852e0824571" args="(const Lock &other)" -->
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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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<a class="anchor" id="a0a5e7c6b770589a05554ebae5681ed10"></a><!-- doxytag: member="Cairo::Device::Lock::~Lock" ref="a0a5e7c6b770589a05554ebae5681ed10" args="()" -->
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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>
</ul>
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