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<td >Qt 5.9</td><td ><a href="qtcore-index.html">Qt Core</a></td><td ><a href="qtcore-module.html">C++ Classes</a></td><td >QVariant</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
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<li class="level1"><a href="#public-functions">Public Functions</a></li>
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<li class="level2"><a href="#a-note-on-gui-types">A Note on GUI Types</a></li>
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<h1 class="title">QVariant Class</h1>
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<p>The <a href="qvariant.html">QVariant</a> class acts like a union for the most common Qt data types. <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 <QVariant></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="qvariant-members.html">List of all members, including inherited members</a></li>
<li><a href="qvariant-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="qvariant.html#QVariant">QVariant</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-1">QVariant</a></b>(Type <i>type</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-36">QVariant</a></b>(const QRegularExpression &<i>re</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-37">QVariant</a></b>(const QUrl &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-38">QVariant</a></b>(const QEasingCurve &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-39">QVariant</a></b>(const QUuid &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-40">QVariant</a></b>(const QModelIndex &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-41">QVariant</a></b>(const QPersistentModelIndex &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-42">QVariant</a></b>(const QJsonValue &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-43">QVariant</a></b>(const QJsonObject &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-44">QVariant</a></b>(const QJsonArray &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-45">QVariant</a></b>(const QJsonDocument &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-46">QVariant</a></b>(QVariant &&<i>other</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-2">QVariant</a></b>(int <i>typeId</i>, const void *<i>copy</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-4">QVariant</a></b>(const QVariant &<i>p</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-5">QVariant</a></b>(QDataStream &<i>s</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-6">QVariant</a></b>(int <i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-7">QVariant</a></b>(uint <i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-8">QVariant</a></b>(qlonglong <i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-9">QVariant</a></b>(qulonglong <i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-10">QVariant</a></b>(bool <i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-11">QVariant</a></b>(double <i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-12">QVariant</a></b>(float <i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-13">QVariant</a></b>(const char *<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-14">QVariant</a></b>(const QByteArray &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-15">QVariant</a></b>(const QBitArray &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-16">QVariant</a></b>(const QString &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-17">QVariant</a></b>(QLatin1String <i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-18">QVariant</a></b>(const QStringList &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-19">QVariant</a></b>(QChar <i>c</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-20">QVariant</a></b>(const QDate &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-21">QVariant</a></b>(const QTime &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-22">QVariant</a></b>(const QDateTime &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-23">QVariant</a></b>(const QList<QVariant> &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-24">QVariant</a></b>(const QMap<QString, QVariant> &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-25">QVariant</a></b>(const QHash<QString, QVariant> &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-26">QVariant</a></b>(const QSize &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-27">QVariant</a></b>(const QSizeF &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-28">QVariant</a></b>(const QPoint &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-29">QVariant</a></b>(const QPointF &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-30">QVariant</a></b>(const QLine &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-31">QVariant</a></b>(const QLineF &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-32">QVariant</a></b>(const QRect &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-33">QVariant</a></b>(const QRectF &<i>val</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-34">QVariant</a></b>(const QLocale &<i>l</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariant-35">QVariant</a></b>(const QRegExp &<i>regExp</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#dtor.QVariant">~QVariant</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#canConvert">canConvert</a></b>(int <i>targetTypeId</i>) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#canConvert-1">canConvert</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#clear">clear</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#convert">convert</a></b>(int <i>targetTypeId</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#isNull">isNull</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#isValid">isValid</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#setValue">setValue</a></b>(const T &<i>value</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#swap">swap</a></b>(QVariant &<i>other</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QBitArray </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toBitArray">toBitArray</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toBool">toBool</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QByteArray </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toByteArray">toByteArray</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QChar </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toChar">toChar</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QDate </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toDate">toDate</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QDateTime </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toDateTime">toDateTime</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> double </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toDouble">toDouble</a></b>(bool *<i>ok</i> = Q_NULLPTR) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QEasingCurve </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toEasingCurve">toEasingCurve</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> float </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toFloat">toFloat</a></b>(bool *<i>ok</i> = Q_NULLPTR) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QHash<QString, QVariant> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toHash">toHash</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toInt">toInt</a></b>(bool *<i>ok</i> = Q_NULLPTR) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QJsonArray </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toJsonArray">toJsonArray</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QJsonDocument </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toJsonDocument">toJsonDocument</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QJsonObject </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toJsonObject">toJsonObject</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QJsonValue </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toJsonValue">toJsonValue</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QLine </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toLine">toLine</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QLineF </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toLineF">toLineF</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QList<QVariant> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toList">toList</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QLocale </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toLocale">toLocale</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> qlonglong </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toLongLong">toLongLong</a></b>(bool *<i>ok</i> = Q_NULLPTR) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QMap<QString, QVariant> </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toMap">toMap</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QModelIndex </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toModelIndex">toModelIndex</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QPersistentModelIndex </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toPersistentModelIndex">toPersistentModelIndex</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QPoint </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toPoint">toPoint</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QPointF </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toPointF">toPointF</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> qreal </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toReal">toReal</a></b>(bool *<i>ok</i> = Q_NULLPTR) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QRect </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toRect">toRect</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QRectF </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toRectF">toRectF</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QRegExp </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toRegExp">toRegExp</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QRegularExpression </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toRegularExpression">toRegularExpression</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QSize </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toSize">toSize</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QSizeF </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toSizeF">toSizeF</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QString </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toString">toString</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QStringList </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toStringList">toStringList</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QTime </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toTime">toTime</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> uint </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toUInt">toUInt</a></b>(bool *<i>ok</i> = Q_NULLPTR) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> qulonglong </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toULongLong">toULongLong</a></b>(bool *<i>ok</i> = Q_NULLPTR) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QUrl </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toUrl">toUrl</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QUuid </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#toUuid">toUuid</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> Type </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#type">type</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const char *</td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#typeName">typeName</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#userType">userType</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> T </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#value">value</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#operator-not-eq">operator!=</a></b>(const QVariant &<i>v</i>) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#operator-lt">operator<</a></b>(const QVariant &<i>v</i>) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#operator-lt-eq">operator<=</a></b>(const QVariant &<i>v</i>) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QVariant &</td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#operator-eq">operator=</a></b>(const QVariant &<i>variant</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QVariant &</td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#operator-eq-1">operator=</a></b>(QVariant &&<i>other</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#operator-eq-eq">operator==</a></b>(const QVariant &<i>v</i>) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#operator-gt">operator></a></b>(const QVariant &<i>v</i>) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#operator-gt-eq">operator>=</a></b>(const QVariant &<i>v</i>) const</td></tr>
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<a name="static-public-members"></a>
<h2 id="static-public-members">Static Public Members</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> QVariant </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#fromValue">fromValue</a></b>(const T &<i>value</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> Type </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#nameToType">nameToType</a></b>(const char *<i>name</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const char *</td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#typeToName">typeToName</a></b>(int <i>typeId</i>)</td></tr>
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<a name="related-non-members"></a>
<h2 id="related-non-members">Related Non-Members</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> typedef </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariantHash-typedef">QVariantHash</a></b></td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> typedef </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariantList-typedef">QVariantList</a></b></td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> typedef </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#QVariantMap-typedef">QVariantMap</a></b></td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> T </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#qvariant_cast">qvariant_cast</a></b>(const QVariant &<i>value</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#operator-not-eq-1">operator!=</a></b>(const QVariant &<i>v1</i>, const QVariant &<i>v2</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qvariant.html#operator-eq-eq-1">operator==</a></b>(const QVariant &<i>v1</i>, const QVariant &<i>v2</i>)</td></tr>
</table></div>
<a name="details"></a>
<!-- $$$QVariant-description -->
<div class="descr">
<h2 id="details">Detailed Description</h2>
<p>The <a href="qvariant.html">QVariant</a> class acts like a union for the most common Qt data types.</p>
<p>Because C++ forbids unions from including types that have non-default constructors or destructors, most interesting Qt classes cannot be used in unions. Without <a href="qvariant.html">QVariant</a>, this would be a problem for <a href="qobject.html#property">QObject::property</a>() and for database work, etc.</p>
<p>A <a href="qvariant.html">QVariant</a> object holds a single value of a single <a href="qvariant.html#type">type</a>() at a time. (Some <a href="qvariant.html#type">type</a>()s are multi-valued, for example a string list.) You can find out what type, T, the variant holds, convert it to a different type using <a href="qvariant.html#convert">convert</a>(), get its value using one of the toT() functions (e.g., <a href="qvariant.html#toSize">toSize</a>()) and check whether the type can be converted to a particular type using <a href="qvariant.html#canConvert-1">canConvert</a>().</p>
<p>The methods named toT() (e.g., <a href="qvariant.html#toInt">toInt</a>(), <a href="qvariant.html#toString">toString</a>()) are const. If you ask for the stored type, they return a copy of the stored object. If you ask for a type that can be generated from the stored type, toT() copies and converts and leaves the object itself unchanged. If you ask for a type that cannot be generated from the stored type, the result depends on the type; see the function documentation for details.</p>
<p>Here is some example code to demonstrate the use of <a href="qvariant.html">QVariant</a>:</p>
<pre class="cpp">
<span class="type"><a href="qdatastream.html">QDataStream</a></span> out(<span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>);
<span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> v(<span class="number">123</span>); <span class="comment">// The variant now contains an int</span>
<span class="type">int</span> x <span class="operator">=</span> v<span class="operator">.</span>toInt(); <span class="comment">// x = 123</span>
out <span class="operator"><</span><span class="operator"><</span> v; <span class="comment">// Writes a type tag and an int to out</span>
v <span class="operator">=</span> <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span>(<span class="string">"hello"</span>); <span class="comment">// The variant now contains a QByteArray</span>
v <span class="operator">=</span> <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span>(tr(<span class="string">"hello"</span>)); <span class="comment">// The variant now contains a QString</span>
<span class="type">int</span> y <span class="operator">=</span> v<span class="operator">.</span>toInt(); <span class="comment">// y = 0 since v cannot be converted to an int</span>
<span class="type"><a href="qstring.html">QString</a></span> s <span class="operator">=</span> v<span class="operator">.</span>toString(); <span class="comment">// s = tr("hello") (see QObject::tr())</span>
out <span class="operator"><</span><span class="operator"><</span> v; <span class="comment">// Writes a type tag and a QString to out</span>
<span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>
<span class="type"><a href="qdatastream.html">QDataStream</a></span> in(<span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>); <span class="comment">// (opening the previously written stream)</span>
in <span class="operator">></span><span class="operator">></span> v; <span class="comment">// Reads an Int variant</span>
<span class="type">int</span> z <span class="operator">=</span> v<span class="operator">.</span>toInt(); <span class="comment">// z = 123</span>
<a href="qtglobal.html#qDebug">qDebug</a>(<span class="string">"Type is %s"</span><span class="operator">,</span> <span class="comment">// prints "Type is int"</span>
v<span class="operator">.</span>typeName());
v <span class="operator">=</span> v<span class="operator">.</span>toInt() <span class="operator">+</span> <span class="number">100</span>; <span class="comment">// The variant now hold the value 223</span>
v <span class="operator">=</span> <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span>(<span class="type"><a href="qstringlist.html">QStringList</a></span>());
</pre>
<p>You can even store <a href="qlist.html">QList</a><<a href="qvariant.html">QVariant</a>> and <a href="qmap.html">QMap</a><<a href="qstring.html">QString</a>, <a href="qvariant.html">QVariant</a>> values in a variant, so you can easily construct arbitrarily complex data structures of arbitrary types. This is very powerful and versatile, but may prove less memory and speed efficient than storing specific types in standard data structures.</p>
<p><a href="qvariant.html">QVariant</a> also supports the notion of null values, where you can have a defined type with no value set. However, note that <a href="qvariant.html">QVariant</a> types can only be cast when they have had a value set.</p>
<pre class="cpp">
<span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> x<span class="operator">,</span> y(<span class="type"><a href="qstring.html">QString</a></span>())<span class="operator">,</span> z(<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">""</span>));
x<span class="operator">.</span>convert(<span class="type"><a href="qvariant.html#QVariant">QVariant</a></span><span class="operator">::</span>Int);
<span class="comment">// x.isNull() == true</span>
<span class="comment">// y.isNull() == true, z.isNull() == false</span>
</pre>
<p><a href="qvariant.html">QVariant</a> can be extended to support other types than those mentioned in the <a href="qvariant-obsolete.html#Type-enum">Type</a> enum. See <a href="custom-types.html">Creating Custom Qt Types</a> for details.</p>
<a name="a-note-on-gui-types"></a>
<h3 >A Note on GUI Types</h3>
<p>Because <a href="qvariant.html">QVariant</a> is part of the Qt Core module, it cannot provide conversion functions to data types defined in Qt GUI, such as <a href="../qtgui/qcolor.html">QColor</a>, <a href="../qtgui/qimage.html">QImage</a>, and <a href="../qtgui/qpixmap.html">QPixmap</a>. In other words, there is no <code>toColor()</code> function. Instead, you can use the <a href="qvariant.html#value">QVariant::value</a>() or the <a href="qvariant.html#qvariant_cast">qvariant_cast</a>() template function. For example:</p>
<pre class="cpp">
<span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> variant;
<span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>
<span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> color <span class="operator">=</span> variant<span class="operator">.</span>value<span class="operator"><</span><span class="type"><a href="../qtgui/qcolor.html">QColor</a></span><span class="operator">></span>();
</pre>
<p>The inverse conversion (e.g., from <a href="../qtgui/qcolor.html">QColor</a> to <a href="qvariant.html">QVariant</a>) is automatic for all data types supported by <a href="qvariant.html">QVariant</a>, including GUI-related types:</p>
<pre class="cpp">
<span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> color <span class="operator">=</span> palette()<span class="operator">.</span>background()<span class="operator">.</span>color();
<span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> variant <span class="operator">=</span> color;
</pre>
<a name="using-canconvert-and-convert-consecutively"></a>
<h3 >Using canConvert() and convert() Consecutively</h3>
<p>When using <a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>() consecutively, it is possible for <a href="qvariant.html#canConvert-1">canConvert</a>() to return true, but <a href="qvariant.html#convert">convert</a>() to return false. This is typically because <a href="qvariant.html#canConvert-1">canConvert</a>() only reports the general ability of <a href="qvariant.html">QVariant</a> to convert between types given suitable data; it is still possible to supply data which cannot actually be converted.</p>
<p>For example, <a href="qvariant.html#canConvert">canConvert</a>(Int) would return true when called on a variant containing a string because, in principle, <a href="qvariant.html">QVariant</a> is able to convert strings of numbers to integers. However, if the string contains non-numeric characters, it cannot be converted to an integer, and any attempt to convert it will fail. Hence, it is important to have both functions return true for a successful conversion.</p>
</div>
<p><b>See also </b><a href="qmetatype.html">QMetaType</a>.</p>
<!-- @@@QVariant -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QVariant[overload1]$$$QVariant -->
<h3 class="fn" id="QVariant"><a name="QVariant"></a>QVariant::<span class="name">QVariant</span>()</h3>
<p>Constructs an invalid variant.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantType -->
<h3 class="fn" id="QVariant-1"><a name="QVariant-1"></a>QVariant::<span class="name">QVariant</span>(<span class="type"><a href="qvariant-obsolete.html#Type-enum">Type</a></span> <i>type</i>)</h3>
<p>Constructs a null variant of type <i>type</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQRegularExpression& -->
<h3 class="fn" id="QVariant-36"><a name="QVariant-36"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qregularexpression.html">QRegularExpression</a></span> &<i>re</i>)</h3>
<p>Constructs a new variant with the regular expression value <i>re</i>.</p>
<p>This function was introduced in Qt 5.0.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQUrl& -->
<h3 class="fn" id="QVariant-37"><a name="QVariant-37"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qurl.html">QUrl</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a url value of <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQEasingCurve& -->
<h3 class="fn" id="QVariant-38"><a name="QVariant-38"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qeasingcurve.html">QEasingCurve</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with an easing curve value, <i>val</i>.</p>
<p>This function was introduced in Qt 4.7.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQUuid& -->
<h3 class="fn" id="QVariant-39"><a name="QVariant-39"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="quuid.html">QUuid</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with an uuid value, <i>val</i>.</p>
<p>This function was introduced in Qt 5.0.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQModelIndex& -->
<h3 class="fn" id="QVariant-40"><a name="QVariant-40"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a <a href="qmodelindex.html">QModelIndex</a> value, <i>val</i>.</p>
<p>This function was introduced in Qt 5.0.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQPersistentModelIndex& -->
<h3 class="fn" id="QVariant-41"><a name="QVariant-41"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qpersistentmodelindex.html">QPersistentModelIndex</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a <a href="qpersistentmodelindex.html">QPersistentModelIndex</a> value, <i>val</i>.</p>
<p>This function was introduced in Qt 5.5.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQJsonValue& -->
<h3 class="fn" id="QVariant-42"><a name="QVariant-42"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qjsonvalue.html">QJsonValue</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a json value, <i>val</i>.</p>
<p>This function was introduced in Qt 5.0.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQJsonObject& -->
<h3 class="fn" id="QVariant-43"><a name="QVariant-43"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qjsonobject.html">QJsonObject</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a json object value, <i>val</i>.</p>
<p>This function was introduced in Qt 5.0.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQJsonArray& -->
<h3 class="fn" id="QVariant-44"><a name="QVariant-44"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qjsonarray.html">QJsonArray</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a json array value, <i>val</i>.</p>
<p>This function was introduced in Qt 5.0.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQJsonDocument& -->
<h3 class="fn" id="QVariant-45"><a name="QVariant-45"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qjsondocument.html">QJsonDocument</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a json document value, <i>val</i>.</p>
<p>This function was introduced in Qt 5.0.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantQVariant&& -->
<h3 class="fn" id="QVariant-46"><a name="QVariant-46"></a>QVariant::<span class="name">QVariant</span>(<span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &&<i>other</i>)</h3>
<p>Move-constructs a <a href="qvariant.html">QVariant</a> instance, making it point at the same object that <i>other</i> was pointing to.</p>
<p>This function was introduced in Qt 5.2.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantintconstvoid* -->
<h3 class="fn" id="QVariant-2"><a name="QVariant-2"></a>QVariant::<span class="name">QVariant</span>(<span class="type">int</span> <i>typeId</i>, const <span class="type">void</span> *<i>copy</i>)</h3>
<p>Constructs variant of type <i>typeId</i>, and initializes with <i>copy</i> if <i>copy</i> is not 0.</p>
<p>Note that you have to pass the address of the variable you want stored.</p>
<p>Usually, you never have to use this constructor, use <a href="qvariant.html#fromValue">QVariant::fromValue</a>() instead to construct variants from the pointer types represented by <code>QMetaType::VoidStar</code>, and <code>QMetaType::QObjectStar</code>.</p>
<p><b>See also </b><a href="qvariant.html#fromValue">QVariant::fromValue</a>() and <a href="qmetatype.html#Type-enum">QMetaType::Type</a>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQVariant& -->
<h3 class="fn" id="QVariant-4"><a name="QVariant-4"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &<i>p</i>)</h3>
<p>Constructs a copy of the variant, <i>p</i>, passed as the argument to this constructor.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantQDataStream& -->
<h3 class="fn" id="QVariant-5"><a name="QVariant-5"></a>QVariant::<span class="name">QVariant</span>(<span class="type"><a href="qdatastream.html">QDataStream</a></span> &<i>s</i>)</h3>
<p>Reads the variant from the data stream, <i>s</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantint -->
<h3 class="fn" id="QVariant-6"><a name="QVariant-6"></a>QVariant::<span class="name">QVariant</span>(<span class="type">int</span> <i>val</i>)</h3>
<p>Constructs a new variant with an integer value, <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantuint -->
<h3 class="fn" id="QVariant-7"><a name="QVariant-7"></a>QVariant::<span class="name">QVariant</span>(<span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> <i>val</i>)</h3>
<p>Constructs a new variant with an unsigned integer value, <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantqlonglong -->
<h3 class="fn" id="QVariant-8"><a name="QVariant-8"></a>QVariant::<span class="name">QVariant</span>(<span class="type"><a href="qtglobal.html#qlonglong-typedef">qlonglong</a></span> <i>val</i>)</h3>
<p>Constructs a new variant with a long long integer value, <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantqulonglong -->
<h3 class="fn" id="QVariant-9"><a name="QVariant-9"></a>QVariant::<span class="name">QVariant</span>(<span class="type"><a href="qtglobal.html#qulonglong-typedef">qulonglong</a></span> <i>val</i>)</h3>
<p>Constructs a new variant with an unsigned long long integer value, <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantbool -->
<h3 class="fn" id="QVariant-10"><a name="QVariant-10"></a>QVariant::<span class="name">QVariant</span>(<span class="type">bool</span> <i>val</i>)</h3>
<p>Constructs a new variant with a boolean value, <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantdouble -->
<h3 class="fn" id="QVariant-11"><a name="QVariant-11"></a>QVariant::<span class="name">QVariant</span>(<span class="type">double</span> <i>val</i>)</h3>
<p>Constructs a new variant with a floating point value, <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantfloat -->
<h3 class="fn" id="QVariant-12"><a name="QVariant-12"></a>QVariant::<span class="name">QVariant</span>(<span class="type">float</span> <i>val</i>)</h3>
<p>Constructs a new variant with a floating point value, <i>val</i>.</p>
<p>This function was introduced in Qt 4.6.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstchar* -->
<h3 class="fn" id="QVariant-13"><a name="QVariant-13"></a>QVariant::<span class="name">QVariant</span>(const <span class="type">char</span> *<i>val</i>)</h3>
<p>Constructs a new variant with a string value of <i>val</i>. The variant creates a deep copy of <i>val</i> into a <a href="qstring.html">QString</a> assuming UTF-8 encoding on the input <i>val</i>.</p>
<p>Note that <i>val</i> is converted to a <a href="qstring.html">QString</a> for storing in the variant and <a href="qvariant.html#userType">QVariant::userType</a>() will return <a href="qmetatype.html#Type-enum">QMetaType::QString</a> for the variant.</p>
<p>You can disable this operator by defining <code>QT_NO_CAST_FROM_ASCII</code> when you compile your applications.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQByteArray& -->
<h3 class="fn" id="QVariant-14"><a name="QVariant-14"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qbytearray.html">QByteArray</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a bytearray value, <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQBitArray& -->
<h3 class="fn" id="QVariant-15"><a name="QVariant-15"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qbitarray.html">QBitArray</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a bitarray value, <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQString& -->
<h3 class="fn" id="QVariant-16"><a name="QVariant-16"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qstring.html">QString</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a string value, <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantQLatin1String -->
<h3 class="fn" id="QVariant-17"><a name="QVariant-17"></a>QVariant::<span class="name">QVariant</span>(<span class="type"><a href="qlatin1string.html">QLatin1String</a></span> <i>val</i>)</h3>
<p>Constructs a new variant with a string value, <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQStringList& -->
<h3 class="fn" id="QVariant-18"><a name="QVariant-18"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qstringlist.html">QStringList</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a string list value, <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantQChar -->
<h3 class="fn" id="QVariant-19"><a name="QVariant-19"></a>QVariant::<span class="name">QVariant</span>(<span class="type"><a href="qchar.html">QChar</a></span> <i>c</i>)</h3>
<p>Constructs a new variant with a char value, <i>c</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQDate& -->
<h3 class="fn" id="QVariant-20"><a name="QVariant-20"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qdate.html">QDate</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a date value, <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQTime& -->
<h3 class="fn" id="QVariant-21"><a name="QVariant-21"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qtime.html">QTime</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a time value, <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQDateTime& -->
<h3 class="fn" id="QVariant-22"><a name="QVariant-22"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qdatetime.html">QDateTime</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a date/time value, <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQList<QVariant>& -->
<h3 class="fn" id="QVariant-23"><a name="QVariant-23"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qlist.html">QList</a></span><<span class="type"><a href="qvariant.html#QVariant">QVariant</a></span>> &<i>val</i>)</h3>
<p>Constructs a new variant with a list value, <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQMap<QString,QVariant>& -->
<h3 class="fn" id="QVariant-24"><a name="QVariant-24"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qmap.html">QMap</a></span><<span class="type"><a href="qstring.html">QString</a></span>, <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span>> &<i>val</i>)</h3>
<p>Constructs a new variant with a map of <a href="qvariant.html">QVariant</a>s, <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQHash<QString,QVariant>& -->
<h3 class="fn" id="QVariant-25"><a name="QVariant-25"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qhash.html">QHash</a></span><<span class="type"><a href="qstring.html">QString</a></span>, <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span>> &<i>val</i>)</h3>
<p>Constructs a new variant with a hash of <a href="qvariant.html">QVariant</a>s, <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQSize& -->
<h3 class="fn" id="QVariant-26"><a name="QVariant-26"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qsize.html">QSize</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a size value of <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQSizeF& -->
<h3 class="fn" id="QVariant-27"><a name="QVariant-27"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qsizef.html">QSizeF</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a size value of <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQPoint& -->
<h3 class="fn" id="QVariant-28"><a name="QVariant-28"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qpoint.html">QPoint</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a point value of <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQPointF& -->
<h3 class="fn" id="QVariant-29"><a name="QVariant-29"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qpointf.html">QPointF</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a point value of <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQLine& -->
<h3 class="fn" id="QVariant-30"><a name="QVariant-30"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qline.html">QLine</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a line value of <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQLineF& -->
<h3 class="fn" id="QVariant-31"><a name="QVariant-31"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qlinef.html">QLineF</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a line value of <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQRect& -->
<h3 class="fn" id="QVariant-32"><a name="QVariant-32"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qrect.html">QRect</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a rect value of <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQRectF& -->
<h3 class="fn" id="QVariant-33"><a name="QVariant-33"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qrectf.html">QRectF</a></span> &<i>val</i>)</h3>
<p>Constructs a new variant with a rect value of <i>val</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQLocale& -->
<h3 class="fn" id="QVariant-34"><a name="QVariant-34"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qlocale.html">QLocale</a></span> &<i>l</i>)</h3>
<p>Constructs a new variant with a locale value, <i>l</i>.</p>
<!-- @@@QVariant -->
<!-- $$$QVariant$$$QVariantconstQRegExp& -->
<h3 class="fn" id="QVariant-35"><a name="QVariant-35"></a>QVariant::<span class="name">QVariant</span>(const <span class="type"><a href="qregexp.html">QRegExp</a></span> &<i>regExp</i>)</h3>
<p>Constructs a new variant with the regexp value <i>regExp</i>.</p>
<!-- @@@QVariant -->
<!-- $$$~QVariant[overload1]$$$~QVariant -->
<h3 class="fn" id="dtor.QVariant"><a name="dtor.QVariant"></a>QVariant::<span class="name">~QVariant</span>()</h3>
<p>Destroys the <a href="qvariant.html">QVariant</a> and the contained object.</p>
<p>Note that subclasses that reimplement <a href="qvariant.html#clear">clear</a>() should reimplement the destructor to call <a href="qvariant.html#clear">clear</a>(). This destructor calls <a href="qvariant.html#clear">clear</a>(), but because it is the destructor, <a href="qvariant.html#clear">QVariant::clear</a>() is called rather than a subclass's <a href="qvariant.html#clear">clear</a>().</p>
<!-- @@@~QVariant -->
<!-- $$$canConvert[overload1]$$$canConvertint -->
<h3 class="fn" id="canConvert"><a name="canConvert"></a><span class="type">bool</span> QVariant::<span class="name">canConvert</span>(<span class="type">int</span> <i>targetTypeId</i>) const</h3>
<p>Returns <code>true</code> if the variant's type can be cast to the requested type, <i>targetTypeId</i>. Such casting is done automatically when calling the <a href="qvariant.html#toInt">toInt</a>(), <a href="qvariant.html#toBool">toBool</a>(), ... methods.</p>
<p>The following casts are done automatically:</p>
<div class="table"><table class="generic">
<thead><tr class="qt-style"><th >Type</th><th >Automatically Cast To</th></tr></thead>
<tr valign="top" class="odd"><td ><a href="qmetatype.html#Type-enum">QMetaType::Bool</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::QChar</a>, <a href="qmetatype.html#Type-enum">QMetaType::Double</a>, <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, <a href="qmetatype.html#Type-enum">QMetaType::UInt</a>, <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a></td></tr>
<tr valign="top" class="even"><td ><a href="qmetatype.html#Type-enum">QMetaType::QByteArray</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::Double</a>, <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, <a href="qmetatype.html#Type-enum">QMetaType::UInt</a>, <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::QUuid</a></td></tr>
<tr valign="top" class="odd"><td ><a href="qmetatype.html#Type-enum">QMetaType::QChar</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::Bool</a>, <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::UInt</a>, <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a></td></tr>
<tr valign="top" class="even"><td ><a href="qmetatype.html#Type-enum">QMetaType::QColor</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::QString</a></td></tr>
<tr valign="top" class="odd"><td ><a href="qmetatype.html#Type-enum">QMetaType::QDate</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::QDateTime</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a></td></tr>
<tr valign="top" class="even"><td ><a href="qmetatype.html#Type-enum">QMetaType::QDateTime</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::QDate</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, <a href="qmetatype.html#Type-enum">QMetaType::QTime</a></td></tr>
<tr valign="top" class="odd"><td ><a href="qmetatype.html#Type-enum">QMetaType::Double</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::Bool</a>, <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, <a href="qmetatype.html#Type-enum">QMetaType::UInt</a>, <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a></td></tr>
<tr valign="top" class="even"><td ><a href="qmetatype.html#Type-enum">QMetaType::QFont</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::QString</a></td></tr>
<tr valign="top" class="odd"><td ><a href="qmetatype.html#Type-enum">QMetaType::Int</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::Bool</a>, <a href="qmetatype.html#Type-enum">QMetaType::QChar</a>, <a href="qmetatype.html#Type-enum">QMetaType::Double</a>, <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, <a href="qmetatype.html#Type-enum">QMetaType::UInt</a>, <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a></td></tr>
<tr valign="top" class="even"><td ><a href="qmetatype.html#Type-enum">QMetaType::QKeySequence</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a></td></tr>
<tr valign="top" class="odd"><td ><a href="qmetatype.html#Type-enum">QMetaType::QVariantList</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::QStringList</a> (if the list's items can be converted to QStrings)</td></tr>
<tr valign="top" class="even"><td ><a href="qmetatype.html#Type-enum">QMetaType::LongLong</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::Bool</a>, <a href="qmetatype.html#Type-enum">QMetaType::QByteArray</a>, <a href="qmetatype.html#Type-enum">QMetaType::QChar</a>, <a href="qmetatype.html#Type-enum">QMetaType::Double</a>, <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, <a href="qmetatype.html#Type-enum">QMetaType::UInt</a>, <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a></td></tr>
<tr valign="top" class="odd"><td ><a href="qmetatype.html#Type-enum">QMetaType::QPoint</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::QPointF</a></td></tr>
<tr valign="top" class="even"><td ><a href="qmetatype.html#Type-enum">QMetaType::QRect</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::QRectF</a></td></tr>
<tr valign="top" class="odd"><td ><a href="qmetatype.html#Type-enum">QMetaType::QString</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::Bool</a>, <a href="qmetatype.html#Type-enum">QMetaType::QByteArray</a>, <a href="qmetatype.html#Type-enum">QMetaType::QChar</a>, <a href="qmetatype.html#Type-enum">QMetaType::QColor</a>, <a href="qmetatype.html#Type-enum">QMetaType::QDate</a>, <a href="qmetatype.html#Type-enum">QMetaType::QDateTime</a>, <a href="qmetatype.html#Type-enum">QMetaType::Double</a>, <a href="qmetatype.html#Type-enum">QMetaType::QFont</a>, <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::QKeySequence</a>, <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::QStringList</a>, <a href="qmetatype.html#Type-enum">QMetaType::QTime</a>, <a href="qmetatype.html#Type-enum">QMetaType::UInt</a>, <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::QUuid</a></td></tr>
<tr valign="top" class="even"><td ><a href="qmetatype.html#Type-enum">QMetaType::QStringList</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::QVariantList</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a> (if the list contains exactly one item)</td></tr>
<tr valign="top" class="odd"><td ><a href="qmetatype.html#Type-enum">QMetaType::QTime</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::QString</a></td></tr>
<tr valign="top" class="even"><td ><a href="qmetatype.html#Type-enum">QMetaType::UInt</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::Bool</a>, <a href="qmetatype.html#Type-enum">QMetaType::QChar</a>, <a href="qmetatype.html#Type-enum">QMetaType::Double</a>, <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a></td></tr>
<tr valign="top" class="odd"><td ><a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::Bool</a>, <a href="qmetatype.html#Type-enum">QMetaType::QChar</a>, <a href="qmetatype.html#Type-enum">QMetaType::Double</a>, <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, <a href="qmetatype.html#Type-enum">QMetaType::UInt</a></td></tr>
<tr valign="top" class="even"><td ><a href="qmetatype.html#Type-enum">QMetaType::QUuid</a></td><td ><a href="qmetatype.html#Type-enum">QMetaType::QByteArray</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a></td></tr>
</table></div>
<p>A <a href="qvariant.html">QVariant</a> containing a pointer to a type derived from <a href="qobject.html">QObject</a> will also return true for this function if a <a href="qobject.html#qobject_cast">qobject_cast</a> to the type described by <i>targetTypeId</i> would succeed. Note that this only works for <a href="qobject.html">QObject</a> subclasses which use the <a href="qobject.html#Q_OBJECT">Q_OBJECT</a> macro.</p>
<p>A <a href="qvariant.html">QVariant</a> containing a sequential container will also return true for this function if the <i>targetTypeId</i> is <a href="qvariant.html#QVariantList-typedef">QVariantList</a>. It is possible to iterate over the contents of the container without extracting it as a (copied) <a href="qvariant.html#QVariantList-typedef">QVariantList</a>:</p>
<pre class="cpp">
<span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span><span class="type">int</span><span class="operator">></span> intList <span class="operator">=</span> {<span class="number">7</span><span class="operator">,</span> <span class="number">11</span><span class="operator">,</span> <span class="number">42</span>};
<span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> variant <span class="operator">=</span> <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span><span class="operator">::</span>fromValue(intList);
<span class="keyword">if</span> (variant<span class="operator">.</span>canConvert<span class="operator"><</span><span class="type"><a href="qvariant.html#QVariantList-typedef">QVariantList</a></span><span class="operator">></span>()) {
<span class="type"><a href="qsequentialiterable.html">QSequentialIterable</a></span> iterable <span class="operator">=</span> variant<span class="operator">.</span>value<span class="operator"><</span><span class="type"><a href="qsequentialiterable.html">QSequentialIterable</a></span><span class="operator">></span>();
<span class="comment">// Can use foreach:</span>
foreach (<span class="keyword">const</span> <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> <span class="operator">&</span>v<span class="operator">,</span> iterable) {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> v;
}
<span class="comment">// Can use C++11 range-for:</span>
<span class="keyword">for</span> (<span class="keyword">const</span> <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> <span class="operator">&</span>v : iterable) {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> v;
}
<span class="comment">// Can use iterators:</span>
<span class="type"><a href="qsequentialiterable.html">QSequentialIterable</a></span><span class="operator">::</span>const_iterator it <span class="operator">=</span> iterable<span class="operator">.</span>begin();
<span class="keyword">const</span> <span class="type"><a href="qsequentialiterable.html">QSequentialIterable</a></span><span class="operator">::</span>const_iterator end <span class="operator">=</span> iterable<span class="operator">.</span>end();
<span class="keyword">for</span> ( ; it <span class="operator">!</span><span class="operator">=</span> end; <span class="operator">+</span><span class="operator">+</span>it) {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="operator">*</span>it;
}
}
</pre>
<p>This requires that the value_type of the container is itself a metatype.</p>
<p>Similarly, a <a href="qvariant.html">QVariant</a> containing a sequential container will also return true for this function the <i>targetTypeId</i> is <a href="qvariant.html#QVariantHash-typedef">QVariantHash</a> or <a href="qvariant.html#QVariantMap-typedef">QVariantMap</a>. It is possible to iterate over the contents of the container without extracting it as a (copied) <a href="qvariant.html#QVariantHash-typedef">QVariantHash</a> or <a href="qvariant.html#QVariantMap-typedef">QVariantMap</a>:</p>
<pre class="cpp">
<span class="type"><a href="qhash.html">QHash</a></span><span class="operator"><</span><span class="type">int</span><span class="operator">,</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">></span> mapping;
mapping<span class="operator">.</span>insert(<span class="number">7</span><span class="operator">,</span> <span class="string">"Seven"</span>);
mapping<span class="operator">.</span>insert(<span class="number">11</span><span class="operator">,</span> <span class="string">"Eleven"</span>);
mapping<span class="operator">.</span>insert(<span class="number">42</span><span class="operator">,</span> <span class="string">"Forty-two"</span>);
<span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> variant <span class="operator">=</span> <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span><span class="operator">::</span>fromValue(mapping);
<span class="keyword">if</span> (variant<span class="operator">.</span>canConvert<span class="operator"><</span><span class="type"><a href="qvariant.html#QVariantHash-typedef">QVariantHash</a></span><span class="operator">></span>()) {
<span class="type"><a href="qassociativeiterable.html">QAssociativeIterable</a></span> iterable <span class="operator">=</span> variant<span class="operator">.</span>value<span class="operator"><</span><span class="type"><a href="qassociativeiterable.html">QAssociativeIterable</a></span><span class="operator">></span>();
<span class="comment">// Can use foreach over the values:</span>
foreach (<span class="keyword">const</span> <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> <span class="operator">&</span>v<span class="operator">,</span> iterable) {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> v;
}
<span class="comment">// Can use C++11 range-for over the values:</span>
<span class="keyword">for</span> (<span class="keyword">const</span> <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> <span class="operator">&</span>v : iterable) {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> v;
}
<span class="comment">// Can use iterators:</span>
<span class="type"><a href="qassociativeiterable.html">QAssociativeIterable</a></span><span class="operator">::</span>const_iterator it <span class="operator">=</span> iterable<span class="operator">.</span>begin();
<span class="keyword">const</span> <span class="type"><a href="qassociativeiterable.html">QAssociativeIterable</a></span><span class="operator">::</span>const_iterator end <span class="operator">=</span> iterable<span class="operator">.</span>end();
<span class="keyword">for</span> ( ; it <span class="operator">!</span><span class="operator">=</span> end; <span class="operator">+</span><span class="operator">+</span>it) {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="operator">*</span>it; <span class="comment">// The current value</span>
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> it<span class="operator">.</span>key();
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> it<span class="operator">.</span>value();
}
}
</pre>
<p><b>See also </b><a href="qvariant.html#convert">convert</a>(), <a href="qsequentialiterable.html">QSequentialIterable</a>, <a href="qmetatype.html#Q_DECLARE_SEQUENTIAL_CONTAINER_METATYPE">Q_DECLARE_SEQUENTIAL_CONTAINER_METATYPE</a>(), <a href="qassociativeiterable.html">QAssociativeIterable</a>, and <a href="qmetatype.html#Q_DECLARE_ASSOCIATIVE_CONTAINER_METATYPE">Q_DECLARE_ASSOCIATIVE_CONTAINER_METATYPE</a>().</p>
<!-- @@@canConvert -->
<!-- $$$canConvert$$$canConvert -->
<h3 class="fn" id="canConvert-1"><a name="canConvert-1"></a><span class="type">bool</span> QVariant::<span class="name">canConvert</span>() const</h3>
<p>Returns <code>true</code> if the variant can be converted to the template type <code>T</code>, otherwise false.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> v <span class="operator">=</span> <span class="number">42</span>;
v<span class="operator">.</span>canConvert<span class="operator"><</span><span class="type">int</span><span class="operator">></span>(); <span class="comment">// returns true</span>
v<span class="operator">.</span>canConvert<span class="operator"><</span><span class="type"><a href="qstring.html">QString</a></span><span class="operator">></span>(); <span class="comment">// returns true</span>
MyCustomStruct s;
v<span class="operator">.</span>setValue(s);
v<span class="operator">.</span>canConvert<span class="operator"><</span><span class="type">int</span><span class="operator">></span>(); <span class="comment">// returns false</span>
v<span class="operator">.</span>canConvert<span class="operator"><</span>MyCustomStruct<span class="operator">></span>(); <span class="comment">// returns true</span>
</pre>
<p>A <a href="qvariant.html">QVariant</a> containing a pointer to a type derived from <a href="qobject.html">QObject</a> will also return true for this function if a <a href="qobject.html#qobject_cast">qobject_cast</a> to the template type <code>T</code> would succeed. Note that this only works for <a href="qobject.html">QObject</a> subclasses which use the <a href="qobject.html#Q_OBJECT">Q_OBJECT</a> macro.</p>
<p><b>See also </b><a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@canConvert -->
<!-- $$$clear[overload1]$$$clear -->
<h3 class="fn" id="clear"><a name="clear"></a><span class="type">void</span> QVariant::<span class="name">clear</span>()</h3>
<p>Convert this variant to type <a href="qmetatype.html#Type-enum">QMetaType::UnknownType</a> and free up any resources used.</p>
<!-- @@@clear -->
<!-- $$$convert[overload1]$$$convertint -->
<h3 class="fn" id="convert"><a name="convert"></a><span class="type">bool</span> QVariant::<span class="name">convert</span>(<span class="type">int</span> <i>targetTypeId</i>)</h3>
<p>Casts the variant to the requested type, <i>targetTypeId</i>. If the cast cannot be done, the variant is cleared. Returns <code>true</code> if the current type of the variant was successfully cast; otherwise returns <code>false</code>.</p>
<p>A <a href="qvariant.html">QVariant</a> containing a pointer to a type derived from <a href="qobject.html">QObject</a> will also convert and return true for this function if a <a href="qobject.html#qobject_cast">qobject_cast</a> to the type described by <i>targetTypeId</i> would succeed. Note that this only works for <a href="qobject.html">QObject</a> subclasses which use the <a href="qobject.html#Q_OBJECT">Q_OBJECT</a> macro.</p>
<p><b>Warning:</b> For historical reasons, converting a null <a href="qvariant.html">QVariant</a> results in a null value of the desired type (e.g., an empty string for <a href="qstring.html">QString</a>) and a result of false.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#clear">clear</a>().</p>
<!-- @@@convert -->
<!-- $$$fromValue[overload1]$$$fromValueconstT& -->
<h3 class="fn" id="fromValue"><a name="fromValue"></a><code>[static] </code><span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> QVariant::<span class="name">fromValue</span>(const <span class="type">T</span> &<i>value</i>)</h3>
<p>Returns a <a href="qvariant.html">QVariant</a> containing a copy of <i>value</i>. Behaves exactly like <a href="qvariant.html#setValue">setValue</a>() otherwise.</p>
<p>Example:</p>
<pre class="cpp">
MyCustomStruct s;
<span class="keyword">return</span> <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span><span class="operator">::</span>fromValue(s);
</pre>
<p><b>Note: </b>If you are working with custom types, you should use the <a href="qmetatype.html#Q_DECLARE_METATYPE">Q_DECLARE_METATYPE</a>() macro to register your custom type.</p><p><b>See also </b><a href="qvariant.html#setValue">setValue</a>() and <a href="qvariant.html#value">value</a>().</p>
<!-- @@@fromValue -->
<!-- $$$isNull[overload1]$$$isNull -->
<h3 class="fn" id="isNull"><a name="isNull"></a><span class="type">bool</span> QVariant::<span class="name">isNull</span>() const</h3>
<p>Returns <code>true</code> if this is a null variant, false otherwise. A variant is considered null if it contains a default constructed value or a built-in type instance that has an isNull method, in which case the result would be the same as calling isNull on the wrapped object.</p>
<p><b>Warning:</b> The result of the function doesn't affect == operator, which means that two values can be equal even if one of them is null and another is not.</p>
<!-- @@@isNull -->
<!-- $$$isValid[overload1]$$$isValid -->
<h3 class="fn" id="isValid"><a name="isValid"></a><span class="type">bool</span> QVariant::<span class="name">isValid</span>() const</h3>
<p>Returns <code>true</code> if the storage type of this variant is not <a href="qmetatype.html#Type-enum">QMetaType::UnknownType</a>; otherwise returns <code>false</code>.</p>
<!-- @@@isValid -->
<!-- $$$nameToType[overload1]$$$nameToTypeconstchar* -->
<h3 class="fn" id="nameToType"><a name="nameToType"></a><code>[static] </code><span class="type"><a href="qvariant-obsolete.html#Type-enum">Type</a></span> QVariant::<span class="name">nameToType</span>(const <span class="type">char</span> *<i>name</i>)</h3>
<p>Converts the string representation of the storage type given in <i>name</i>, to its enum representation.</p>
<p>If the string representation cannot be converted to any enum representation, the variant is set to <code>Invalid</code>.</p>
<!-- @@@nameToType -->
<!-- $$$setValue[overload1]$$$setValueconstT& -->
<h3 class="fn" id="setValue"><a name="setValue"></a><span class="type">void</span> QVariant::<span class="name">setValue</span>(const <span class="type">T</span> &<i>value</i>)</h3>
<p>Stores a copy of <i>value</i>. If <code>T</code> is a type that <a href="qvariant.html">QVariant</a> doesn't support, <a href="qmetatype.html">QMetaType</a> is used to store the value. A compile error will occur if <a href="qmetatype.html">QMetaType</a> doesn't handle the type.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> v;
v<span class="operator">.</span>setValue(<span class="number">5</span>);
<span class="type">int</span> i <span class="operator">=</span> v<span class="operator">.</span>toInt(); <span class="comment">// i is now 5</span>
<span class="type"><a href="qstring.html">QString</a></span> s <span class="operator">=</span> v<span class="operator">.</span>toString() <span class="comment">// s is now "5"</span>
MyCustomStruct c;
v<span class="operator">.</span>setValue(c);
<span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>
MyCustomStruct c2 <span class="operator">=</span> v<span class="operator">.</span>value<span class="operator"><</span>MyCustomStruct<span class="operator">></span>();
</pre>
<p><b>See also </b><a href="qvariant.html#value">value</a>(), <a href="qvariant.html#fromValue">fromValue</a>(), and <a href="qvariant.html#canConvert-1">canConvert</a>().</p>
<!-- @@@setValue -->
<!-- $$$swap[overload1]$$$swapQVariant& -->
<h3 class="fn" id="swap"><a name="swap"></a><span class="type">void</span> QVariant::<span class="name">swap</span>(<span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &<i>other</i>)</h3>
<p>Swaps variant <i>other</i> with this variant. This operation is very fast and never fails.</p>
<p>This function was introduced in Qt 4.8.</p>
<!-- @@@swap -->
<!-- $$$toBitArray[overload1]$$$toBitArray -->
<h3 class="fn" id="toBitArray"><a name="toBitArray"></a><span class="type"><a href="qbitarray.html">QBitArray</a></span> QVariant::<span class="name">toBitArray</span>() const</h3>
<p>Returns the variant as a <a href="qbitarray.html">QBitArray</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QBitArray</a>; otherwise returns an empty bit array.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toBitArray -->
<!-- $$$toBool[overload1]$$$toBool -->
<h3 class="fn" id="toBool"><a name="toBool"></a><span class="type">bool</span> QVariant::<span class="name">toBool</span>() const</h3>
<p>Returns the variant as a bool if the variant has <a href="qvariant.html#userType">userType</a>() Bool.</p>
<p>Returns <code>true</code> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::Bool</a>, <a href="qmetatype.html#Type-enum">QMetaType::QChar</a>, <a href="qmetatype.html#Type-enum">QMetaType::Double</a>, <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::UInt</a>, or <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a> and the value is non-zero, or if the variant has type <a href="qmetatype.html#Type-enum">QMetaType::QString</a> or <a href="qmetatype.html#Type-enum">QMetaType::QByteArray</a> and its lower-case content is not one of the following: empty, "0" or "false"; otherwise returns <code>false</code>.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toBool -->
<!-- $$$toByteArray[overload1]$$$toByteArray -->
<h3 class="fn" id="toByteArray"><a name="toByteArray"></a><span class="type"><a href="qbytearray.html">QByteArray</a></span> QVariant::<span class="name">toByteArray</span>() const</h3>
<p>Returns the variant as a <a href="qbytearray.html">QByteArray</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QByteArray</a> or <a href="qmetatype.html#Type-enum">QMetaType::QString</a> (converted using <a href="qstring.html#fromUtf8">QString::fromUtf8</a>()); otherwise returns an empty byte array.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toByteArray -->
<!-- $$$toChar[overload1]$$$toChar -->
<h3 class="fn" id="toChar"><a name="toChar"></a><span class="type"><a href="qchar.html">QChar</a></span> QVariant::<span class="name">toChar</span>() const</h3>
<p>Returns the variant as a <a href="qchar.html">QChar</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QChar</a>, <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, or <a href="qmetatype.html#Type-enum">QMetaType::UInt</a>; otherwise returns an invalid <a href="qchar.html">QChar</a>.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toChar -->
<!-- $$$toDate[overload1]$$$toDate -->
<h3 class="fn" id="toDate"><a name="toDate"></a><span class="type"><a href="qdate.html">QDate</a></span> QVariant::<span class="name">toDate</span>() const</h3>
<p>Returns the variant as a <a href="qdate.html">QDate</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QDate</a>, <a href="qmetatype.html#Type-enum">QMetaType::QDateTime</a>, or <a href="qmetatype.html#Type-enum">QMetaType::QString</a>; otherwise returns an invalid date.</p>
<p>If the <a href="qvariant.html#type">type</a>() is <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, an invalid date will be returned if the string cannot be parsed as a <a href="qt.html#DateFormat-enum">Qt::ISODate</a> format date.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toDate -->
<!-- $$$toDateTime[overload1]$$$toDateTime -->
<h3 class="fn" id="toDateTime"><a name="toDateTime"></a><span class="type"><a href="qdatetime.html">QDateTime</a></span> QVariant::<span class="name">toDateTime</span>() const</h3>
<p>Returns the variant as a <a href="qdatetime.html">QDateTime</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QDateTime</a>, <a href="qmetatype.html#Type-enum">QMetaType::QDate</a>, or <a href="qmetatype.html#Type-enum">QMetaType::QString</a>; otherwise returns an invalid date/time.</p>
<p>If the <a href="qvariant.html#type">type</a>() is <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, an invalid date/time will be returned if the string cannot be parsed as a <a href="qt.html#DateFormat-enum">Qt::ISODate</a> format date/time.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toDateTime -->
<!-- $$$toDouble[overload1]$$$toDoublebool* -->
<h3 class="fn" id="toDouble"><a name="toDouble"></a><span class="type">double</span> QVariant::<span class="name">toDouble</span>(<span class="type">bool</span> *<i>ok</i> = Q_NULLPTR) const</h3>
<p>Returns the variant as a double if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::Double</a>, <a href="qmetatype.html#Type-enum">QMetaType::Float</a>, <a href="qmetatype.html#Type-enum">QMetaType::Bool</a>, <a href="qmetatype.html#Type-enum">QMetaType::QByteArray</a>, <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, <a href="qmetatype.html#Type-enum">QMetaType::UInt</a>, or <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a>; otherwise returns 0.0.</p>
<p>If <i>ok</i> is non-null: <code>*</code><i>ok</i> is set to true if the value could be converted to a double; otherwise <code>*</code><i>ok</i> is set to false.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toDouble -->
<!-- $$$toEasingCurve[overload1]$$$toEasingCurve -->
<h3 class="fn" id="toEasingCurve"><a name="toEasingCurve"></a><span class="type"><a href="qeasingcurve.html">QEasingCurve</a></span> QVariant::<span class="name">toEasingCurve</span>() const</h3>
<p>Returns the variant as a <a href="qeasingcurve.html">QEasingCurve</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QEasingCurve</a>; otherwise returns a default easing curve.</p>
<p>This function was introduced in Qt 4.7.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toEasingCurve -->
<!-- $$$toFloat[overload1]$$$toFloatbool* -->
<h3 class="fn" id="toFloat"><a name="toFloat"></a><span class="type">float</span> QVariant::<span class="name">toFloat</span>(<span class="type">bool</span> *<i>ok</i> = Q_NULLPTR) const</h3>
<p>Returns the variant as a float if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::Double</a>, <a href="qmetatype.html#Type-enum">QMetaType::Float</a>, <a href="qmetatype.html#Type-enum">QMetaType::Bool</a>, <a href="qmetatype.html#Type-enum">QMetaType::QByteArray</a>, <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, <a href="qmetatype.html#Type-enum">QMetaType::UInt</a>, or <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a>; otherwise returns 0.0.</p>
<p>If <i>ok</i> is non-null: <code>*</code><i>ok</i> is set to true if the value could be converted to a double; otherwise <code>*</code><i>ok</i> is set to false.</p>
<p>This function was introduced in Qt 4.6.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toFloat -->
<!-- $$$toHash[overload1]$$$toHash -->
<h3 class="fn" id="toHash"><a name="toHash"></a><span class="type"><a href="qhash.html">QHash</a></span><<span class="type"><a href="qstring.html">QString</a></span>, <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span>> QVariant::<span class="name">toHash</span>() const</h3>
<p>Returns the variant as a <a href="qhash.html#qhash">QHash</a><<a href="qstring.html">QString</a>, <a href="qvariant.html">QVariant</a>> if the variant has <a href="qvariant.html#type">type</a>() <a href="qmetatype.html#Type-enum">QMetaType::QVariantHash</a>; otherwise returns an empty map.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toHash -->
<!-- $$$toInt[overload1]$$$toIntbool* -->
<h3 class="fn" id="toInt"><a name="toInt"></a><span class="type">int</span> QVariant::<span class="name">toInt</span>(<span class="type">bool</span> *<i>ok</i> = Q_NULLPTR) const</h3>
<p>Returns the variant as an int if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::Bool</a>, <a href="qmetatype.html#Type-enum">QMetaType::QByteArray</a>, <a href="qmetatype.html#Type-enum">QMetaType::QChar</a>, <a href="qmetatype.html#Type-enum">QMetaType::Double</a>, <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, <a href="qmetatype.html#Type-enum">QMetaType::UInt</a>, or <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a>; otherwise returns 0.</p>
<p>If <i>ok</i> is non-null: <code>*</code><i>ok</i> is set to true if the value could be converted to an int; otherwise <code>*</code><i>ok</i> is set to false.</p>
<p><b>Warning:</b> If the value is convertible to a <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a> but is too large to be represented in an int, the resulting arithmetic overflow will not be reflected in <i>ok</i>. A simple workaround is to use <a href="qstring.html#toInt">QString::toInt</a>().</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toInt -->
<!-- $$$toJsonArray[overload1]$$$toJsonArray -->
<h3 class="fn" id="toJsonArray"><a name="toJsonArray"></a><span class="type"><a href="qjsonarray.html">QJsonArray</a></span> QVariant::<span class="name">toJsonArray</span>() const</h3>
<p>Returns the variant as a <a href="qjsonarray.html">QJsonArray</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qjsonarray.html">QJsonArray</a>; otherwise returns a default constructed <a href="qjsonarray.html">QJsonArray</a>.</p>
<p>This function was introduced in Qt 5.0.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toJsonArray -->
<!-- $$$toJsonDocument[overload1]$$$toJsonDocument -->
<h3 class="fn" id="toJsonDocument"><a name="toJsonDocument"></a><span class="type"><a href="qjsondocument.html">QJsonDocument</a></span> QVariant::<span class="name">toJsonDocument</span>() const</h3>
<p>Returns the variant as a <a href="qjsondocument.html">QJsonDocument</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qjsondocument.html">QJsonDocument</a>; otherwise returns a default constructed <a href="qjsondocument.html">QJsonDocument</a>.</p>
<p>This function was introduced in Qt 5.0.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toJsonDocument -->
<!-- $$$toJsonObject[overload1]$$$toJsonObject -->
<h3 class="fn" id="toJsonObject"><a name="toJsonObject"></a><span class="type"><a href="qjsonobject.html">QJsonObject</a></span> QVariant::<span class="name">toJsonObject</span>() const</h3>
<p>Returns the variant as a <a href="qjsonobject.html">QJsonObject</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qjsonobject.html">QJsonObject</a>; otherwise returns a default constructed <a href="qjsonobject.html">QJsonObject</a>.</p>
<p>This function was introduced in Qt 5.0.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toJsonObject -->
<!-- $$$toJsonValue[overload1]$$$toJsonValue -->
<h3 class="fn" id="toJsonValue"><a name="toJsonValue"></a><span class="type"><a href="qjsonvalue.html">QJsonValue</a></span> QVariant::<span class="name">toJsonValue</span>() const</h3>
<p>Returns the variant as a <a href="qjsonvalue.html">QJsonValue</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qjsonvalue.html">QJsonValue</a>; otherwise returns a default constructed <a href="qjsonvalue.html">QJsonValue</a>.</p>
<p>This function was introduced in Qt 5.0.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toJsonValue -->
<!-- $$$toLine[overload1]$$$toLine -->
<h3 class="fn" id="toLine"><a name="toLine"></a><span class="type"><a href="qline.html">QLine</a></span> QVariant::<span class="name">toLine</span>() const</h3>
<p>Returns the variant as a <a href="qline.html">QLine</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QLine</a>; otherwise returns an invalid <a href="qline.html">QLine</a>.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toLine -->
<!-- $$$toLineF[overload1]$$$toLineF -->
<h3 class="fn" id="toLineF"><a name="toLineF"></a><span class="type"><a href="qlinef.html">QLineF</a></span> QVariant::<span class="name">toLineF</span>() const</h3>
<p>Returns the variant as a <a href="qlinef.html">QLineF</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QLineF</a>; otherwise returns an invalid <a href="qlinef.html">QLineF</a>.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toLineF -->
<!-- $$$toList[overload1]$$$toList -->
<h3 class="fn" id="toList"><a name="toList"></a><span class="type"><a href="qlist.html">QList</a></span><<span class="type"><a href="qvariant.html#QVariant">QVariant</a></span>> QVariant::<span class="name">toList</span>() const</h3>
<p>Returns the variant as a <a href="qvariant.html#QVariantList-typedef">QVariantList</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QVariantList</a> or <a href="qmetatype.html#Type-enum">QMetaType::QStringList</a>; otherwise returns an empty list.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toList -->
<!-- $$$toLocale[overload1]$$$toLocale -->
<h3 class="fn" id="toLocale"><a name="toLocale"></a><span class="type"><a href="qlocale.html">QLocale</a></span> QVariant::<span class="name">toLocale</span>() const</h3>
<p>Returns the variant as a <a href="qlocale.html">QLocale</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QLocale</a>; otherwise returns an invalid <a href="qlocale.html">QLocale</a>.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toLocale -->
<!-- $$$toLongLong[overload1]$$$toLongLongbool* -->
<h3 class="fn" id="toLongLong"><a name="toLongLong"></a><span class="type"><a href="qtglobal.html#qlonglong-typedef">qlonglong</a></span> QVariant::<span class="name">toLongLong</span>(<span class="type">bool</span> *<i>ok</i> = Q_NULLPTR) const</h3>
<p>Returns the variant as a long long int if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::Bool</a>, <a href="qmetatype.html#Type-enum">QMetaType::QByteArray</a>, <a href="qmetatype.html#Type-enum">QMetaType::QChar</a>, <a href="qmetatype.html#Type-enum">QMetaType::Double</a>, <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, <a href="qmetatype.html#Type-enum">QMetaType::UInt</a>, or <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a>; otherwise returns 0.</p>
<p>If <i>ok</i> is non-null: <code>*</code><code>ok</code> is set to true if the value could be converted to an int; otherwise <code>*</code><code>ok</code> is set to false.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toLongLong -->
<!-- $$$toMap[overload1]$$$toMap -->
<h3 class="fn" id="toMap"><a name="toMap"></a><span class="type"><a href="qmap.html">QMap</a></span><<span class="type"><a href="qstring.html">QString</a></span>, <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span>> QVariant::<span class="name">toMap</span>() const</h3>
<p>Returns the variant as a <a href="qmap.html">QMap</a><<a href="qstring.html">QString</a>, <a href="qvariant.html">QVariant</a>> if the variant has <a href="qvariant.html#type">type</a>() <a href="qmetatype.html#Type-enum">QMetaType::QVariantMap</a>; otherwise returns an empty map.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toMap -->
<!-- $$$toModelIndex[overload1]$$$toModelIndex -->
<h3 class="fn" id="toModelIndex"><a name="toModelIndex"></a><span class="type"><a href="qmodelindex.html">QModelIndex</a></span> QVariant::<span class="name">toModelIndex</span>() const</h3>
<p>Returns the variant as a <a href="qmodelindex.html">QModelIndex</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmodelindex.html">QModelIndex</a>; otherwise returns a default constructed <a href="qmodelindex.html">QModelIndex</a>.</p>
<p>This function was introduced in Qt 5.0.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>(), <a href="qvariant.html#convert">convert</a>(), and <a href="qvariant.html#toPersistentModelIndex">toPersistentModelIndex</a>().</p>
<!-- @@@toModelIndex -->
<!-- $$$toPersistentModelIndex[overload1]$$$toPersistentModelIndex -->
<h3 class="fn" id="toPersistentModelIndex"><a name="toPersistentModelIndex"></a><span class="type"><a href="qpersistentmodelindex.html">QPersistentModelIndex</a></span> QVariant::<span class="name">toPersistentModelIndex</span>() const</h3>
<p>Returns the variant as a <a href="qpersistentmodelindex.html">QPersistentModelIndex</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qpersistentmodelindex.html">QPersistentModelIndex</a>; otherwise returns a default constructed <a href="qpersistentmodelindex.html">QPersistentModelIndex</a>.</p>
<p>This function was introduced in Qt 5.5.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>(), <a href="qvariant.html#convert">convert</a>(), and <a href="qvariant.html#toModelIndex">toModelIndex</a>().</p>
<!-- @@@toPersistentModelIndex -->
<!-- $$$toPoint[overload1]$$$toPoint -->
<h3 class="fn" id="toPoint"><a name="toPoint"></a><span class="type"><a href="qpoint.html">QPoint</a></span> QVariant::<span class="name">toPoint</span>() const</h3>
<p>Returns the variant as a <a href="qpoint.html">QPoint</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QPoint</a> or <a href="qmetatype.html#Type-enum">QMetaType::QPointF</a>; otherwise returns a null <a href="qpoint.html">QPoint</a>.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toPoint -->
<!-- $$$toPointF[overload1]$$$toPointF -->
<h3 class="fn" id="toPointF"><a name="toPointF"></a><span class="type"><a href="qpointf.html">QPointF</a></span> QVariant::<span class="name">toPointF</span>() const</h3>
<p>Returns the variant as a <a href="qpointf.html">QPointF</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QPoint</a> or <a href="qmetatype.html#Type-enum">QMetaType::QPointF</a>; otherwise returns a null <a href="qpointf.html">QPointF</a>.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toPointF -->
<!-- $$$toReal[overload1]$$$toRealbool* -->
<h3 class="fn" id="toReal"><a name="toReal"></a><span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> QVariant::<span class="name">toReal</span>(<span class="type">bool</span> *<i>ok</i> = Q_NULLPTR) const</h3>
<p>Returns the variant as a qreal if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::Double</a>, <a href="qmetatype.html#Type-enum">QMetaType::Float</a>, <a href="qmetatype.html#Type-enum">QMetaType::Bool</a>, <a href="qmetatype.html#Type-enum">QMetaType::QByteArray</a>, <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, <a href="qmetatype.html#Type-enum">QMetaType::UInt</a>, or <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a>; otherwise returns 0.0.</p>
<p>If <i>ok</i> is non-null: <code>*</code><i>ok</i> is set to true if the value could be converted to a double; otherwise <code>*</code><i>ok</i> is set to false.</p>
<p>This function was introduced in Qt 4.6.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toReal -->
<!-- $$$toRect[overload1]$$$toRect -->
<h3 class="fn" id="toRect"><a name="toRect"></a><span class="type"><a href="qrect.html">QRect</a></span> QVariant::<span class="name">toRect</span>() const</h3>
<p>Returns the variant as a <a href="qrect.html">QRect</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QRect</a>; otherwise returns an invalid <a href="qrect.html">QRect</a>.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toRect -->
<!-- $$$toRectF[overload1]$$$toRectF -->
<h3 class="fn" id="toRectF"><a name="toRectF"></a><span class="type"><a href="qrectf.html">QRectF</a></span> QVariant::<span class="name">toRectF</span>() const</h3>
<p>Returns the variant as a <a href="qrectf.html">QRectF</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QRect</a> or <a href="qmetatype.html#Type-enum">QMetaType::QRectF</a>; otherwise returns an invalid <a href="qrectf.html">QRectF</a>.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toRectF -->
<!-- $$$toRegExp[overload1]$$$toRegExp -->
<h3 class="fn" id="toRegExp"><a name="toRegExp"></a><span class="type"><a href="qregexp.html">QRegExp</a></span> QVariant::<span class="name">toRegExp</span>() const</h3>
<p>Returns the variant as a <a href="qregexp.html">QRegExp</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QRegExp</a>; otherwise returns an empty <a href="qregexp.html">QRegExp</a>.</p>
<p>This function was introduced in Qt 4.1.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toRegExp -->
<!-- $$$toRegularExpression[overload1]$$$toRegularExpression -->
<h3 class="fn" id="toRegularExpression"><a name="toRegularExpression"></a><span class="type"><a href="qregularexpression.html">QRegularExpression</a></span> QVariant::<span class="name">toRegularExpression</span>() const</h3>
<p>Returns the variant as a <a href="qregularexpression.html">QRegularExpression</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qregularexpression.html">QRegularExpression</a>; otherwise returns an empty <a href="qregularexpression.html">QRegularExpression</a>.</p>
<p>This function was introduced in Qt 5.0.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toRegularExpression -->
<!-- $$$toSize[overload1]$$$toSize -->
<h3 class="fn" id="toSize"><a name="toSize"></a><span class="type"><a href="qsize.html">QSize</a></span> QVariant::<span class="name">toSize</span>() const</h3>
<p>Returns the variant as a <a href="qsize.html">QSize</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QSize</a>; otherwise returns an invalid <a href="qsize.html">QSize</a>.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toSize -->
<!-- $$$toSizeF[overload1]$$$toSizeF -->
<h3 class="fn" id="toSizeF"><a name="toSizeF"></a><span class="type"><a href="qsizef.html">QSizeF</a></span> QVariant::<span class="name">toSizeF</span>() const</h3>
<p>Returns the variant as a <a href="qsizef.html">QSizeF</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QSizeF</a>; otherwise returns an invalid <a href="qsizef.html">QSizeF</a>.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toSizeF -->
<!-- $$$toString[overload1]$$$toString -->
<h3 class="fn" id="toString"><a name="toString"></a><span class="type"><a href="qstring.html">QString</a></span> QVariant::<span class="name">toString</span>() const</h3>
<p>Returns the variant as a <a href="qstring.html">QString</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, <a href="qmetatype.html#Type-enum">QMetaType::Bool</a>, <a href="qmetatype.html#Type-enum">QMetaType::QByteArray</a>, <a href="qmetatype.html#Type-enum">QMetaType::QChar</a>, <a href="qmetatype.html#Type-enum">QMetaType::QDate</a>, <a href="qmetatype.html#Type-enum">QMetaType::QDateTime</a>, <a href="qmetatype.html#Type-enum">QMetaType::Double</a>, <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::QStringList</a>, <a href="qmetatype.html#Type-enum">QMetaType::QTime</a>, <a href="qmetatype.html#Type-enum">QMetaType::UInt</a>, or <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a>; otherwise returns an empty string.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toString -->
<!-- $$$toStringList[overload1]$$$toStringList -->
<h3 class="fn" id="toStringList"><a name="toStringList"></a><span class="type"><a href="qstringlist.html">QStringList</a></span> QVariant::<span class="name">toStringList</span>() const</h3>
<p>Returns the variant as a <a href="qstringlist.html">QStringList</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QStringList</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, or <a href="qmetatype.html#Type-enum">QMetaType::QVariantList</a> of a type that can be converted to <a href="qstring.html">QString</a>; otherwise returns an empty list.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toStringList -->
<!-- $$$toTime[overload1]$$$toTime -->
<h3 class="fn" id="toTime"><a name="toTime"></a><span class="type"><a href="qtime.html">QTime</a></span> QVariant::<span class="name">toTime</span>() const</h3>
<p>Returns the variant as a <a href="qtime.html">QTime</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QTime</a>, <a href="qmetatype.html#Type-enum">QMetaType::QDateTime</a>, or <a href="qmetatype.html#Type-enum">QMetaType::QString</a>; otherwise returns an invalid time.</p>
<p>If the <a href="qvariant.html#type">type</a>() is <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, an invalid time will be returned if the string cannot be parsed as a <a href="qt.html#DateFormat-enum">Qt::ISODate</a> format time.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toTime -->
<!-- $$$toUInt[overload1]$$$toUIntbool* -->
<h3 class="fn" id="toUInt"><a name="toUInt"></a><span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> QVariant::<span class="name">toUInt</span>(<span class="type">bool</span> *<i>ok</i> = Q_NULLPTR) const</h3>
<p>Returns the variant as an unsigned int if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::UInt</a>, <a href="qmetatype.html#Type-enum">QMetaType::Bool</a>, <a href="qmetatype.html#Type-enum">QMetaType::QByteArray</a>, <a href="qmetatype.html#Type-enum">QMetaType::QChar</a>, <a href="qmetatype.html#Type-enum">QMetaType::Double</a>, <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, or <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a>; otherwise returns 0.</p>
<p>If <i>ok</i> is non-null: <code>*</code><i>ok</i> is set to true if the value could be converted to an unsigned int; otherwise <code>*</code><i>ok</i> is set to false.</p>
<p><b>Warning:</b> If the value is convertible to a <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a> but is too large to be represented in an unsigned int, the resulting arithmetic overflow will not be reflected in <i>ok</i>. A simple workaround is to use <a href="qstring.html#toUInt">QString::toUInt</a>().</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toUInt -->
<!-- $$$toULongLong[overload1]$$$toULongLongbool* -->
<h3 class="fn" id="toULongLong"><a name="toULongLong"></a><span class="type"><a href="qtglobal.html#qulonglong-typedef">qulonglong</a></span> QVariant::<span class="name">toULongLong</span>(<span class="type">bool</span> *<i>ok</i> = Q_NULLPTR) const</h3>
<p>Returns the variant as an unsigned long long int if the variant has <a href="qvariant.html#type">type</a>() <a href="qmetatype.html#Type-enum">QMetaType::ULongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::Bool</a>, <a href="qmetatype.html#Type-enum">QMetaType::QByteArray</a>, <a href="qmetatype.html#Type-enum">QMetaType::QChar</a>, <a href="qmetatype.html#Type-enum">QMetaType::Double</a>, <a href="qmetatype.html#Type-enum">QMetaType::Int</a>, <a href="qmetatype.html#Type-enum">QMetaType::LongLong</a>, <a href="qmetatype.html#Type-enum">QMetaType::QString</a>, or <a href="qmetatype.html#Type-enum">QMetaType::UInt</a>; otherwise returns 0.</p>
<p>If <i>ok</i> is non-null: <code>*</code><i>ok</i> is set to true if the value could be converted to an int; otherwise <code>*</code><i>ok</i> is set to false.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toULongLong -->
<!-- $$$toUrl[overload1]$$$toUrl -->
<h3 class="fn" id="toUrl"><a name="toUrl"></a><span class="type"><a href="qurl.html">QUrl</a></span> QVariant::<span class="name">toUrl</span>() const</h3>
<p>Returns the variant as a <a href="qurl.html">QUrl</a> if the variant has <a href="qvariant.html#userType">userType</a>() <a href="qmetatype.html#Type-enum">QMetaType::QUrl</a>; otherwise returns an invalid <a href="qurl.html">QUrl</a>.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toUrl -->
<!-- $$$toUuid[overload1]$$$toUuid -->
<h3 class="fn" id="toUuid"><a name="toUuid"></a><span class="type"><a href="quuid.html">QUuid</a></span> QVariant::<span class="name">toUuid</span>() const</h3>
<p>Returns the variant as a <a href="quuid.html">QUuid</a> if the variant has <a href="qvariant.html#type">type</a>() <a href="qmetatype.html#Type-enum">QMetaType::QUuid</a>, <a href="qmetatype.html#Type-enum">QMetaType::QByteArray</a> or <a href="qmetatype.html#Type-enum">QMetaType::QString</a>; otherwise returns a default-constructed <a href="quuid.html">QUuid</a>.</p>
<p>This function was introduced in Qt 5.0.</p>
<p><b>See also </b><a href="qvariant.html#canConvert-1">canConvert</a>() and <a href="qvariant.html#convert">convert</a>().</p>
<!-- @@@toUuid -->
<!-- $$$type[overload1]$$$type -->
<h3 class="fn" id="type"><a name="type"></a><span class="type"><a href="qvariant-obsolete.html#Type-enum">Type</a></span> QVariant::<span class="name">type</span>() const</h3>
<p>Returns the storage type of the value stored in the variant. Although this function is declared as returning QVariant::Type, the return value should be interpreted as <a href="qmetatype.html#Type-enum">QMetaType::Type</a>. In particular, QVariant::UserType is returned here only if the value is equal or greater than <a href="qmetatype.html#Type-enum">QMetaType::User</a>.</p>
<p>Note that return values in the ranges QVariant::Char through QVariant::RegExp and QVariant::Font through QVariant::Transform correspond to the values in the ranges <a href="qmetatype.html#Type-enum">QMetaType::QChar</a> through <a href="qmetatype.html#Type-enum">QMetaType::QRegExp</a> and <a href="qmetatype.html#Type-enum">QMetaType::QFont</a> through <a href="qmetatype.html#Type-enum">QMetaType::QQuaternion</a>.</p>
<p>Pay particular attention when working with char and <a href="qchar.html">QChar</a> variants. Note that there is no <a href="qvariant.html">QVariant</a> constructor specifically for type char, but there is one for <a href="qchar.html">QChar</a>. For a variant of type <a href="qchar.html">QChar</a>, this function returns QVariant::Char, which is the same as <a href="qmetatype.html#Type-enum">QMetaType::QChar</a>, but for a variant of type <code>char</code>, this function returns <a href="qmetatype.html#Type-enum">QMetaType::Char</a>, which is <i>not</i> the same as QVariant::Char.</p>
<p>Also note that the types <code>void*</code>, <code>long</code>, <code>short</code>, <code>unsigned</code> <code>long</code>, <code>unsigned</code> <code>short</code>, <code>unsigned</code> <code>char</code>, <code>float</code>, <code>QObject*</code>, and <code>QWidget*</code> are represented in <a href="qmetatype.html#Type-enum">QMetaType::Type</a> but not in QVariant::Type, and they can be returned by this function. However, they are considered to be user defined types when tested against QVariant::Type.</p>
<p>To test whether an instance of <a href="qvariant.html">QVariant</a> contains a data type that is compatible with the data type you are interested in, use <a href="qvariant.html#canConvert-1">canConvert</a>().</p>
<!-- @@@type -->
<!-- $$$typeName[overload1]$$$typeName -->
<h3 class="fn" id="typeName"><a name="typeName"></a>const <span class="type">char</span> *QVariant::<span class="name">typeName</span>() const</h3>
<p>Returns the name of the type stored in the variant. The returned strings describe the C++ datatype used to store the data: for example, "<a href="../qtgui/qfont.html">QFont</a>", "<a href="qstring.html">QString</a>", or "<a href="qvariant.html#QVariantList-typedef">QVariantList</a>". An Invalid variant returns 0.</p>
<!-- @@@typeName -->
<!-- $$$typeToName[overload1]$$$typeToNameint -->
<h3 class="fn" id="typeToName"><a name="typeToName"></a><code>[static] </code>const <span class="type">char</span> *QVariant::<span class="name">typeToName</span>(<span class="type">int</span> <i>typeId</i>)</h3>
<p>Converts the int representation of the storage type, <i>typeId</i>, to its string representation.</p>
<p>Returns a null pointer if the type is <a href="qmetatype.html#Type-enum">QMetaType::UnknownType</a> or doesn't exist.</p>
<!-- @@@typeToName -->
<!-- $$$userType[overload1]$$$userType -->
<h3 class="fn" id="userType"><a name="userType"></a><span class="type">int</span> QVariant::<span class="name">userType</span>() const</h3>
<p>Returns the storage type of the value stored in the variant. For non-user types, this is the same as <a href="qvariant.html#type">type</a>().</p>
<p><b>See also </b><a href="qvariant.html#type">type</a>().</p>
<!-- @@@userType -->
<!-- $$$value[overload1]$$$value -->
<h3 class="fn" id="value"><a name="value"></a><span class="type">T</span> QVariant::<span class="name">value</span>() const</h3>
<p>Returns the stored value converted to the template type <code>T</code>. Call <a href="qvariant.html#canConvert-1">canConvert</a>() to find out whether a type can be converted. If the value cannot be converted, a <a href="containers.html#default-constructed-value">default-constructed value</a> will be returned.</p>
<p>If the type <code>T</code> is supported by <a href="qvariant.html">QVariant</a>, this function behaves exactly as <a href="qvariant.html#toString">toString</a>(), <a href="qvariant.html#toInt">toInt</a>() etc.</p>
<p>Example:</p>
<pre class="cpp">
<span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> v;
MyCustomStruct c;
<span class="keyword">if</span> (v<span class="operator">.</span>canConvert<span class="operator"><</span>MyCustomStruct<span class="operator">></span>())
c <span class="operator">=</span> v<span class="operator">.</span>value<span class="operator"><</span>MyCustomStruct<span class="operator">></span>();
v <span class="operator">=</span> <span class="number">7</span>;
<span class="type">int</span> i <span class="operator">=</span> v<span class="operator">.</span>value<span class="operator"><</span><span class="type">int</span><span class="operator">></span>(); <span class="comment">// same as v.toInt()</span>
<span class="type"><a href="qstring.html">QString</a></span> s <span class="operator">=</span> v<span class="operator">.</span>value<span class="operator"><</span><span class="type"><a href="qstring.html">QString</a></span><span class="operator">></span>(); <span class="comment">// same as v.toString(), s is now "7"</span>
MyCustomStruct c2 <span class="operator">=</span> v<span class="operator">.</span>value<span class="operator"><</span>MyCustomStruct<span class="operator">></span>(); <span class="comment">// conversion failed, c2 is empty</span>
</pre>
<p>If the <a href="qvariant.html">QVariant</a> contains a pointer to a type derived from <a href="qobject.html">QObject</a> then <code>T</code> may be any <a href="qobject.html">QObject</a> type. If the pointer stored in the <a href="qvariant.html">QVariant</a> can be <a href="qobject.html#qobject_cast">qobject_cast</a> to T, then that result is returned. Otherwise a null pointer is returned. Note that this only works for <a href="qobject.html">QObject</a> subclasses which use the <a href="qobject.html#Q_OBJECT">Q_OBJECT</a> macro.</p>
<p>If the <a href="qvariant.html">QVariant</a> contains a sequential container and <code>T</code> is <a href="qvariant.html#QVariantList-typedef">QVariantList</a>, the elements of the container will be converted into <a href="qvariant.html">QVariant</a>s and returned as a <a href="qvariant.html#QVariantList-typedef">QVariantList</a>.</p>
<pre class="cpp">
<span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span><span class="type">int</span><span class="operator">></span> intList <span class="operator">=</span> {<span class="number">7</span><span class="operator">,</span> <span class="number">11</span><span class="operator">,</span> <span class="number">42</span>};
<span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> variant <span class="operator">=</span> <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span><span class="operator">::</span>fromValue(intList);
<span class="keyword">if</span> (variant<span class="operator">.</span>canConvert<span class="operator"><</span><span class="type"><a href="qvariant.html#QVariantList-typedef">QVariantList</a></span><span class="operator">></span>()) {
<span class="type"><a href="qsequentialiterable.html">QSequentialIterable</a></span> iterable <span class="operator">=</span> variant<span class="operator">.</span>value<span class="operator"><</span><span class="type"><a href="qsequentialiterable.html">QSequentialIterable</a></span><span class="operator">></span>();
<span class="comment">// Can use foreach:</span>
foreach (<span class="keyword">const</span> <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> <span class="operator">&</span>v<span class="operator">,</span> iterable) {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> v;
}
<span class="comment">// Can use C++11 range-for:</span>
<span class="keyword">for</span> (<span class="keyword">const</span> <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> <span class="operator">&</span>v : iterable) {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> v;
}
<span class="comment">// Can use iterators:</span>
<span class="type"><a href="qsequentialiterable.html">QSequentialIterable</a></span><span class="operator">::</span>const_iterator it <span class="operator">=</span> iterable<span class="operator">.</span>begin();
<span class="keyword">const</span> <span class="type"><a href="qsequentialiterable.html">QSequentialIterable</a></span><span class="operator">::</span>const_iterator end <span class="operator">=</span> iterable<span class="operator">.</span>end();
<span class="keyword">for</span> ( ; it <span class="operator">!</span><span class="operator">=</span> end; <span class="operator">+</span><span class="operator">+</span>it) {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="operator">*</span>it;
}
}
</pre>
<p><b>See also </b><a href="qvariant.html#setValue">setValue</a>(), <a href="qvariant.html#fromValue">fromValue</a>(), <a href="qvariant.html#canConvert-1">canConvert</a>(), and <a href="qmetatype.html#Q_DECLARE_SEQUENTIAL_CONTAINER_METATYPE">Q_DECLARE_SEQUENTIAL_CONTAINER_METATYPE</a>().</p>
<!-- @@@value -->
<!-- $$$operator!=[overload1]$$$operator!=constQVariant& -->
<h3 class="fn" id="operator-not-eq"><a name="operator-not-eq"></a><span class="type">bool</span> QVariant::<span class="name">operator!=</span>(const <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &<i>v</i>) const</h3>
<p>Compares this <a href="qvariant.html">QVariant</a> with <i>v</i> and returns <code>true</code> if they are not equal; otherwise returns <code>false</code>.</p>
<p><b>Warning:</b> To make this function work with a custom type registered with <a href="qmetatype.html#qRegisterMetaType-1">qRegisterMetaType</a>(), its comparison operator must be registered using <a href="qmetatype.html#registerComparators">QMetaType::registerComparators</a>().</p>
<!-- @@@operator!= -->
<!-- $$$operator<[overload1]$$$operator<constQVariant& -->
<h3 class="fn" id="operator-lt"><a name="operator-lt"></a><span class="type">bool</span> QVariant::<span class="name">operator<</span>(const <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &<i>v</i>) const</h3>
<p>Compares this <a href="qvariant.html">QVariant</a> with <i>v</i> and returns <code>true</code> if this is less than <i>v</i>.</p>
<p><b>Note: </b>Comparability might not be availabe for the type stored in this <a href="qvariant.html">QVariant</a> or in <i>v</i>.</p><p><b>Warning:</b> To make this function work with a custom type registered with <a href="qmetatype.html#qRegisterMetaType-1">qRegisterMetaType</a>(), its comparison operator must be registered using <a href="qmetatype.html#registerComparators">QMetaType::registerComparators</a>().</p>
<!-- @@@operator< -->
<!-- $$$operator<=[overload1]$$$operator<=constQVariant& -->
<h3 class="fn" id="operator-lt-eq"><a name="operator-lt-eq"></a><span class="type">bool</span> QVariant::<span class="name">operator<=</span>(const <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &<i>v</i>) const</h3>
<p>Compares this <a href="qvariant.html">QVariant</a> with <i>v</i> and returns <code>true</code> if this is less or equal than <i>v</i>.</p>
<p><b>Note: </b>Comparability might not be available for the type stored in this <a href="qvariant.html">QVariant</a> or in <i>v</i>.</p><p><b>Warning:</b> To make this function work with a custom type registered with <a href="qmetatype.html#qRegisterMetaType-1">qRegisterMetaType</a>(), its comparison operator must be registered using <a href="qmetatype.html#registerComparators">QMetaType::registerComparators</a>().</p>
<!-- @@@operator<= -->
<!-- $$$operator=[overload1]$$$operator=constQVariant& -->
<h3 class="fn" id="operator-eq"><a name="operator-eq"></a><span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &QVariant::<span class="name">operator=</span>(const <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &<i>variant</i>)</h3>
<p>Assigns the value of the variant <i>variant</i> to this variant.</p>
<!-- @@@operator= -->
<!-- $$$operator=$$$operator=QVariant&& -->
<h3 class="fn" id="operator-eq-1"><a name="operator-eq-1"></a><span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &QVariant::<span class="name">operator=</span>(<span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &&<i>other</i>)</h3>
<p>Move-assigns <i>other</i> to this <a href="qvariant.html">QVariant</a> instance.</p>
<p>This function was introduced in Qt 5.2.</p>
<!-- @@@operator= -->
<!-- $$$operator==[overload1]$$$operator==constQVariant& -->
<h3 class="fn" id="operator-eq-eq"><a name="operator-eq-eq"></a><span class="type">bool</span> QVariant::<span class="name">operator==</span>(const <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &<i>v</i>) const</h3>
<p>Compares this <a href="qvariant.html">QVariant</a> with <i>v</i> and returns <code>true</code> if they are equal; otherwise returns <code>false</code>.</p>
<p><a href="qvariant.html">QVariant</a> uses the equality operator of the <a href="qvariant.html#type">type</a>() it contains to check for equality. <a href="qvariant.html">QVariant</a> will try to <a href="qvariant.html#convert">convert</a>() <i>v</i> if its type is not the same as this variant's type. See <a href="qvariant.html#canConvert-1">canConvert</a>() for a list of possible conversions.</p>
<p><b>Warning:</b> To make this function work with a custom type registered with <a href="qmetatype.html#qRegisterMetaType-1">qRegisterMetaType</a>(), its comparison operator must be registered using <a href="qmetatype.html#registerComparators">QMetaType::registerComparators</a>().</p>
<!-- @@@operator== -->
<!-- $$$operator>[overload1]$$$operator>constQVariant& -->
<h3 class="fn" id="operator-gt"><a name="operator-gt"></a><span class="type">bool</span> QVariant::<span class="name">operator></span>(const <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &<i>v</i>) const</h3>
<p>Compares this <a href="qvariant.html">QVariant</a> with <i>v</i> and returns <code>true</code> if this is larger than <i>v</i>.</p>
<p><b>Note: </b>Comparability might not be available for the type stored in this <a href="qvariant.html">QVariant</a> or in <i>v</i>.</p><p><b>Warning:</b> To make this function work with a custom type registered with <a href="qmetatype.html#qRegisterMetaType-1">qRegisterMetaType</a>(), its comparison operator must be registered using <a href="qmetatype.html#registerComparators">QMetaType::registerComparators</a>().</p>
<!-- @@@operator> -->
<!-- $$$operator>=[overload1]$$$operator>=constQVariant& -->
<h3 class="fn" id="operator-gt-eq"><a name="operator-gt-eq"></a><span class="type">bool</span> QVariant::<span class="name">operator>=</span>(const <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &<i>v</i>) const</h3>
<p>Compares this <a href="qvariant.html">QVariant</a> with <i>v</i> and returns <code>true</code> if this is larger or equal than <i>v</i>.</p>
<p><b>Note: </b>Comparability might not be available for the type stored in this <a href="qvariant.html">QVariant</a> or in <i>v</i>.</p><p><b>Warning:</b> To make this function work with a custom type registered with <a href="qmetatype.html#qRegisterMetaType-1">qRegisterMetaType</a>(), its comparison operator must be registered using <a href="qmetatype.html#registerComparators">QMetaType::registerComparators</a>().</p>
<!-- @@@operator>= -->
</div>
<div class="relnonmem">
<h2>Related Non-Members</h2>
<!-- $$$QVariantHash -->
<h3 class="fn" id="QVariantHash-typedef"><a name="QVariantHash-typedef"></a>typedef <span class="name">QVariantHash</span></h3>
<p>Synonym for <a href="qhash.html#qhash">QHash</a><<a href="qstring.html">QString</a>, <a href="qvariant.html">QVariant</a>>.</p>
<p>This typedef was introduced in Qt 4.5.</p>
<!-- @@@QVariantHash -->
<!-- $$$QVariantList -->
<h3 class="fn" id="QVariantList-typedef"><a name="QVariantList-typedef"></a>typedef <span class="name">QVariantList</span></h3>
<p>Synonym for <a href="qlist.html">QList</a><<a href="qvariant.html">QVariant</a>>.</p>
<!-- @@@QVariantList -->
<!-- $$$QVariantMap -->
<h3 class="fn" id="QVariantMap-typedef"><a name="QVariantMap-typedef"></a>typedef <span class="name">QVariantMap</span></h3>
<p>Synonym for <a href="qmap.html">QMap</a><<a href="qstring.html">QString</a>, <a href="qvariant.html">QVariant</a>>.</p>
<!-- @@@QVariantMap -->
<!-- $$$qvariant_cast[overload1]$$$qvariant_castconstQVariant& -->
<h3 class="fn" id="qvariant_cast"><a name="qvariant_cast"></a><span class="type">T</span> <span class="name">qvariant_cast</span>(const <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &<i>value</i>)</h3>
<p>Returns the given <i>value</i> converted to the template type <code>T</code>.</p>
<p>This function is equivalent to <a href="qvariant.html#value">QVariant::value</a>().</p>
<p><b>See also </b><a href="qvariant.html#value">QVariant::value</a>().</p>
<!-- @@@qvariant_cast -->
<!-- $$$operator!=$$$operator!=constQVariant&constQVariant& -->
<h3 class="fn" id="operator-not-eq-1"><a name="operator-not-eq-1"></a><span class="type">bool</span> <span class="name">operator!=</span>(const <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &<i>v1</i>, const <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &<i>v2</i>)</h3>
<p>Returns <code>false</code> if <i>v1</i> and <i>v2</i> are equal; otherwise returns <code>true</code>.</p>
<p><b>Warning:</b> To make this function work with a custom type registered with <a href="qmetatype.html#qRegisterMetaType-1">qRegisterMetaType</a>(), its comparison operator must be registered using <a href="qmetatype.html#registerComparators">QMetaType::registerComparators</a>().</p>
<!-- @@@operator!= -->
<!-- $$$operator==$$$operator==constQVariant&constQVariant& -->
<h3 class="fn" id="operator-eq-eq-1"><a name="operator-eq-eq-1"></a><span class="type">bool</span> <span class="name">operator==</span>(const <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &<i>v1</i>, const <span class="type"><a href="qvariant.html#QVariant">QVariant</a></span> &<i>v2</i>)</h3>
<p>Returns <code>true</code> if <i>v1</i> and <i>v2</i> are equal; otherwise returns <code>false</code>.</p>
<p>If <i>v1</i> and <i>v2</i> have the same <a href="qvariant.html#type">type()</a>, the type's equality operator is used for comparison. If not, it is attempted to <a href="qvariant.html#convert">convert()</a> <i>v2</i> to the same type as <i>v1</i>. See <a href="qvariant.html#canConvert-1">canConvert()</a> for a list of possible conversions.</p>
<p>The result of the function is not affected by the result of <a href="qvariant.html#isNull">QVariant::isNull</a>, which means that two values can be equal even if one of them is null and another is not.</p>
<p><b>Warning:</b> To make this function work with a custom type registered with <a href="qmetatype.html#qRegisterMetaType-1">qRegisterMetaType</a>(), its comparison operator must be registered using <a href="qmetatype.html#registerComparators">QMetaType::registerComparators</a>().</p>
<!-- @@@operator== -->
</div>
</div>
</div>
</div>
</div>
</div>
<div class="footer">
<p>
<acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property
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distrib
>
Mageia
>
6
>
armv5tl
>
media
>
core-updates
>
by-pkgid
>
768f7d9f703884aa2562bf0a651086df
>
files
>
849
