<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- qobject.cpp --> <title>Connection Class | Qt Core 5.12.6</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <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 >Connection</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> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"> <div class="toc"> <h3><a name="toc">Contents</a></h3> <ul> <li class="level1"><a href="#public-functions">Public Functions</a></li> <li class="level1"><a href="#details">Detailed Description</a></li> </ul> </div> <div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">Connection Class</h1> <span class="small-subtitle">(<a href="qmetaobject-connection.html">QMetaObject::Connection</a>)<br/></span> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <Connection></span> </td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += core</td></tr></table></div><ul> <li><a href="qmetaobject-connection-members.html">List of all members, including inherited members</a></li> </ul> <a name="public-functions"></a> <h2 id="public-functions">Public Functions</h2> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qmetaobject-connection.html#Connection">Connection</a></b>()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qmetaobject-connection.html#Connection-2">Connection</a></b>(const Connection &<i>other</i>)</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qmetaobject-connection.html#Connection-3">Connection</a></b>(Connection &&<i>o</i>)</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qmetaobject-connection.html#dtor.Connection">~Connection</a></b>()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qmetaobject-connection.html#operator-bool">operator bool</a></b>() const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> Connection &</td><td class="memItemRight bottomAlign"><b><a href="qmetaobject-connection.html#operator-eq">operator=</a></b>(const Connection &<i>other</i>)</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> Connection &</td><td class="memItemRight bottomAlign"><b><a href="qmetaobject-connection.html#operator-eq-1">operator=</a></b>(Connection &&<i>other</i>)</td></tr> </table></div> <a name="details"></a> <!-- $$$Connection-description --> <div class="descr"> <h2 id="details">Detailed Description</h2> <p>Represents a handle to a signal-slot (or signal-functor) connection.</p> <p>It can be used to check if the connection is valid and to disconnect it using <a href="qobject.html#disconnect">QObject::disconnect</a>(). For a signal-functor connection without a context object, it is the only way to selectively disconnect that connection.</p> <p>As Connection is just a handle, the underlying signal-slot connection is unaffected when Connection is destroyed or reassigned.</p> </div> <!-- @@@Connection --> <div class="func"> <h2>Member Function Documentation</h2> <!-- $$$Connection[overload1]$$$Connection --> <h3 class="fn" id="Connection"><a name="Connection"></a>Connection::<span class="name">Connection</span>()</h3> <p>Creates a Connection instance.</p> <!-- @@@Connection --> <!-- $$$Connection$$$ConnectionconstConnection& --> <h3 class="fn" id="Connection-2"><a name="Connection-2"></a>Connection::<span class="name">Connection</span>(const <span class="type"><a href="qmetaobject-connection.html#Connection">Connection</a></span> &<i>other</i>)</h3> <p>Create a copy of the handle to the <i>other</i> connection</p> <!-- @@@Connection --> <!-- $$$Connection$$$ConnectionConnection&& --> <h3 class="fn" id="Connection-3"><a name="Connection-3"></a>Connection::<span class="name">Connection</span>(<span class="type"><a href="qmetaobject-connection.html#Connection">Connection</a></span> &&<i>o</i>)</h3> <p>Move-constructs a Connection instance, making it point to the same object that <i>o</i> was pointing to.</p> <!-- @@@Connection --> <!-- $$$~Connection[overload1]$$$~Connection --> <h3 class="fn" id="dtor.Connection"><a name="dtor.Connection"></a>Connection::<span class="name">~Connection</span>()</h3> <p>Destructor for <a href="qmetaobject-connection.html">QMetaObject::Connection</a>.</p> <!-- @@@~Connection --> <!-- $$$operator bool[overload1]$$$operator bool --> <h3 class="fn" id="operator-bool"><a name="operator-bool"></a><span class="type">bool</span> Connection::<span class="name">operator bool</span>() const</h3> <p>Returns <code>true</code> if the connection is valid.</p> <p>The connection is valid if the call to <a href="qobject.html#connect">QObject::connect</a> succeeded. The connection is invalid if <a href="qobject.html#connect">QObject::connect</a> was not able to find the signal or the slot, or if the arguments do not match.</p> <!-- @@@operator bool --> <!-- $$$operator=[overload1]$$$operator=constConnection& --> <h3 class="fn" id="operator-eq"><a name="operator-eq"></a><span class="type"><a href="qmetaobject-connection.html#Connection">Connection</a></span> &Connection::<span class="name">operator=</span>(const <span class="type"><a href="qmetaobject-connection.html#Connection">Connection</a></span> &<i>other</i>)</h3> <p>Assigns <i>other</i> to this connection and returns a reference to this connection.</p> <!-- @@@operator= --> <!-- $$$operator=$$$operator=Connection&& --> <h3 class="fn" id="operator-eq-1"><a name="operator-eq-1"></a><span class="type"><a href="qmetaobject-connection.html#Connection">Connection</a></span> &Connection::<span class="name">operator=</span>(<span class="type"><a href="qmetaobject-connection.html#Connection">Connection</a></span> &&<i>other</i>)</h3> <p>Move-assigns <i>other</i> to this object, and returns a reference.</p> <!-- @@@operator= --> </div> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. 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