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<td >Qt 5.12</td><td ><a href="qtcore-index.html">Qt Core</a></td><td ><a href="qtcore-module.html">C++ Classes</a></td><td >QObjectCleanupHandler</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtcore-index.html">Qt 5.12.6 Reference Documentation</a></td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#static-public-members">Static Public Members</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QObjectCleanupHandler Class</h1>
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<p>The <a href="qobjectcleanuphandler.html">QObjectCleanupHandler</a> class watches the lifetime of multiple QObjects. <a href="#details">More...</a></p>
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<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QObjectCleanupHandler></span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += core</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="qobject.html">QObject</a></td></tr></table></div><ul>
<li><a href="qobjectcleanuphandler-members.html">List of all members, including inherited members</a></li>
<li><a href="qobjectcleanuphandler-obsolete.html">Obsolete members</a></li>
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<h2 id="public-functions">Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qobjectcleanuphandler.html#QObjectCleanupHandler">QObjectCleanupHandler</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual </td><td class="memItemRight bottomAlign"><b><a href="qobjectcleanuphandler.html#dtor.QObjectCleanupHandler">~QObjectCleanupHandler</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QObject *</td><td class="memItemRight bottomAlign"><b><a href="qobjectcleanuphandler.html#add">add</a></b>(QObject *<i>object</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qobjectcleanuphandler.html#clear">clear</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qobjectcleanuphandler.html#isEmpty">isEmpty</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qobjectcleanuphandler.html#remove">remove</a></b>(QObject *<i>object</i>)</td></tr>
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<li class="fn">32 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>
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<h2 id="static-public-members">Static Public Members</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> const QMetaObject </td><td class="memItemRight bottomAlign"><b><a href="qobjectcleanuphandler.html#staticMetaObject-var">staticMetaObject</a></b></td></tr>
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<li class="fn">10 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li>
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<h3>Additional Inherited Members</h3>
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<li class="fn">1 property inherited from <a href="qobject.html#properties">QObject</a></li>
<li class="fn">1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li>
<li class="fn">2 signals inherited from <a href="qobject.html#signals">QObject</a></li>
<li class="fn">9 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
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<h2 id="details">Detailed Description</h2>
<p>The <a href="qobjectcleanuphandler.html">QObjectCleanupHandler</a> class watches the lifetime of multiple QObjects.</p>
<p>A <a href="qobjectcleanuphandler.html">QObjectCleanupHandler</a> is useful whenever you need to know when a number of <a href="qobject.html">QObject</a>s that are owned by someone else have been deleted. This is important, for example, when referencing memory in an application that has been allocated in a shared library.</p>
<p>To keep track of some <a href="qobject.html">QObject</a>s, create a <a href="qobjectcleanuphandler.html">QObjectCleanupHandler</a>, and <a href="qobjectcleanuphandler.html#add">add</a>() the objects you are interested in. If you are no longer interested in tracking a particular object, use <a href="qobjectcleanuphandler.html#remove">remove</a>() to remove it from the cleanup handler. If an object being tracked by the cleanup handler gets deleted by someone else it will automatically be removed from the cleanup handler. You can delete all the objects in the cleanup handler with <a href="qobjectcleanuphandler.html#clear">clear</a>(), or by destroying the cleanup handler. <a href="qobjectcleanuphandler.html#isEmpty">isEmpty</a>() returns <code>true</code> if the <a href="qobjectcleanuphandler.html">QObjectCleanupHandler</a> has no objects to keep track of.</p>
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<p><b>See also </b><a href="qpointer.html">QPointer</a>.</p>
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<h2>Member Function Documentation</h2>
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<h3 class="fn" id="QObjectCleanupHandler"><a name="QObjectCleanupHandler"></a>QObjectCleanupHandler::<span class="name">QObjectCleanupHandler</span>()</h3>
<p>Constructs an empty <a href="qobjectcleanuphandler.html">QObjectCleanupHandler</a>.</p>
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<h3 class="fn" id="dtor.QObjectCleanupHandler"><a name="dtor.QObjectCleanupHandler"></a><code>[virtual] </code>QObjectCleanupHandler::<span class="name">~QObjectCleanupHandler</span>()</h3>
<p>Destroys the cleanup handler. All objects in this cleanup handler will be deleted.</p>
<p><b>See also </b><a href="qobjectcleanuphandler.html#clear">clear</a>().</p>
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<h3 class="fn" id="add"><a name="add"></a><span class="type"><a href="qobject.html#QObject">QObject</a></span> *QObjectCleanupHandler::<span class="name">add</span>(<span class="type"><a href="qobject.html#QObject">QObject</a></span> *<i>object</i>)</h3>
<p>Adds <i>object</i> to this cleanup handler and returns the pointer to the object.</p>
<p><b>See also </b><a href="qobjectcleanuphandler.html#remove">remove</a>().</p>
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<h3 class="fn" id="clear"><a name="clear"></a><span class="type">void</span> QObjectCleanupHandler::<span class="name">clear</span>()</h3>
<p>Deletes all objects in this cleanup handler. The cleanup handler becomes empty.</p>
<p><b>See also </b><a href="qobjectcleanuphandler.html#isEmpty">isEmpty</a>().</p>
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<h3 class="fn" id="isEmpty"><a name="isEmpty"></a><span class="type">bool</span> QObjectCleanupHandler::<span class="name">isEmpty</span>() const</h3>
<p>Returns <code>true</code> if this cleanup handler is empty or if all objects in this cleanup handler have been destroyed; otherwise return false.</p>
<p><b>See also </b><a href="qobjectcleanuphandler.html#add">add</a>(), <a href="qobjectcleanuphandler.html#remove">remove</a>(), and <a href="qobjectcleanuphandler.html#clear">clear</a>().</p>
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<h3 class="fn" id="remove"><a name="remove"></a><span class="type">void</span> QObjectCleanupHandler::<span class="name">remove</span>(<span class="type"><a href="qobject.html#QObject">QObject</a></span> *<i>object</i>)</h3>
<p>Removes the <i>object</i> from this cleanup handler. The object will not be destroyed.</p>
<p><b>See also </b><a href="qobjectcleanuphandler.html#add">add</a>().</p>
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