339 lines
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339 lines
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<h1 class="title">QPersistentModelIndex Class Reference</h1>
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<!-- $$$QPersistentModelIndex-brief -->
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<p>The QPersistentModelIndex class is used to locate data in a data model. <a href="#details">More...</a></p>
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<!-- @@@QPersistentModelIndex -->
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<pre class="cpp"> <span class="preprocessor">#include <QPersistentModelIndex></span></pre><ul>
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<li><a href="qpersistentmodelindex-members.html">List of all members, including inherited members</a></li>
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<a name="public-functions"></a>
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<h2>Public Functions</h2>
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<table class="alignedsummary">
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#QPersistentModelIndex">QPersistentModelIndex</a></b> ( const QModelIndex & <i>index</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#QPersistentModelIndex-3">QPersistentModelIndex</a></b> ( const QPersistentModelIndex & <i>other</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QModelIndex </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#child">child</a></b> ( int <i>row</i>, int <i>column</i> ) const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#column">column</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QVariant </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#data">data</a></b> ( int <i>role</i> = Qt::DisplayRole ) const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> Qt::ItemFlags </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#flags">flags</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#isValid">isValid</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> const QAbstractItemModel * </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#model">model</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QModelIndex </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#parent">parent</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#row">row</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QModelIndex </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#sibling">sibling</a></b> ( int <i>row</i>, int <i>column</i> ) const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#operator-const-QModelIndex--and">operator const QModelIndex &</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#operator-not-eq">operator!=</a></b> ( const QPersistentModelIndex & <i>other</i> ) const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#operator-not-eq-2">operator!=</a></b> ( const QModelIndex & <i>other</i> ) const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#operator-lt">operator<</a></b> ( const QPersistentModelIndex & <i>other</i> ) const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QPersistentModelIndex & </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#operator-eq">operator=</a></b> ( const QPersistentModelIndex & <i>other</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QPersistentModelIndex & </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#operator-eq-2">operator=</a></b> ( const QModelIndex & <i>other</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#operator-eq-eq">operator==</a></b> ( const QPersistentModelIndex & <i>other</i> ) const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpersistentmodelindex.html#operator-eq-eq-2">operator==</a></b> ( const QModelIndex & <i>other</i> ) const</td></tr>
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</table>
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<a name="details"></a>
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<!-- $$$QPersistentModelIndex-description -->
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<div class="descr">
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<h2>Detailed Description</h2>
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<p>The QPersistentModelIndex class is used to locate data in a data model.</p>
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<p>A QPersistentModelIndex is a model index that can be stored by an application, and later used to access information in a model. Unlike the <a href="qmodelindex.html">QModelIndex</a> class, it is safe to store a QPersistentModelIndex since the model will ensure that references to items will continue to be valid as long as they can be accessed by the model.</p>
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<p>It is good practice to check that persistent model indexes are valid before using them.</p>
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</div>
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<p><b>See also </b><a href="model-view-programming.html">Model/View Programming</a>, <a href="qmodelindex.html">QModelIndex</a>, and <a href="qabstractitemmodel.html">QAbstractItemModel</a>.</p>
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<!-- @@@QPersistentModelIndex -->
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<div class="func">
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<h2>Member Function Documentation</h2>
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<!-- $$$QPersistentModelIndex[overload1]$$$QPersistentModelIndexconstQModelIndex& -->
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<h3 class="fn"><a name="QPersistentModelIndex"></a>QPersistentModelIndex::<span class="name">QPersistentModelIndex</span> ( const <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> & <i>index</i> )</h3>
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<p>Creates a new <a href="qpersistentmodelindex.html">QPersistentModelIndex</a> that is a copy of the model <i>index</i>.</p>
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<!-- @@@QPersistentModelIndex -->
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<!-- $$$QPersistentModelIndex$$$QPersistentModelIndexconstQPersistentModelIndex& -->
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<h3 class="fn"><a name="QPersistentModelIndex-3"></a>QPersistentModelIndex::<span class="name">QPersistentModelIndex</span> ( const <span class="type">QPersistentModelIndex</span> & <i>other</i> )</h3>
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<p>Creates a new <a href="qpersistentmodelindex.html">QPersistentModelIndex</a> that is a copy of the <i>other</i> persistent model index.</p>
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<!-- @@@QPersistentModelIndex -->
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<!-- $$$child[overload1]$$$childintint -->
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<h3 class="fn"><a name="child"></a><span class="type"><a href="qmodelindex.html">QModelIndex</a></span> QPersistentModelIndex::<span class="name">child</span> ( <span class="type">int</span> <i>row</i>, <span class="type">int</span> <i>column</i> ) const</h3>
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<p>Returns the child of the model index that is stored in the given <i>row</i> and <i>column</i>.</p>
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<p><b>See also </b><a href="qpersistentmodelindex.html#parent">parent</a>() and <a href="qpersistentmodelindex.html#sibling">sibling</a>().</p>
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<!-- @@@child -->
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<!-- $$$column[overload1]$$$column -->
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<h3 class="fn"><a name="column"></a><span class="type">int</span> QPersistentModelIndex::<span class="name">column</span> () const</h3>
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<p>Returns the column this persistent model index refers to.</p>
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<!-- @@@column -->
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<!-- $$$data[overload1]$$$dataint -->
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<h3 class="fn"><a name="data"></a><span class="type"><a href="qvariant.html">QVariant</a></span> QPersistentModelIndex::<span class="name">data</span> ( <span class="type">int</span> <i>role</i> = Qt::DisplayRole ) const</h3>
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<p>Returns the data for the given <i>role</i> for the item referred to by the index.</p>
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<p><b>See also </b><a href="qt.html#ItemDataRole-enum">Qt::ItemDataRole</a> and <a href="qabstractitemmodel.html#setData">QAbstractItemModel::setData</a>().</p>
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<!-- @@@data -->
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<!-- $$$flags[overload1]$$$flags -->
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<h3 class="fn"><a name="flags"></a><span class="type"><a href="qt.html#ItemFlag-enum">Qt::ItemFlags</a></span> QPersistentModelIndex::<span class="name">flags</span> () const</h3>
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<p>Returns the flags for the item referred to by the index.</p>
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<p>This function was introduced in Qt 4.2.</p>
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<!-- @@@flags -->
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<!-- $$$isValid[overload1]$$$isValid -->
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<h3 class="fn"><a name="isValid"></a><span class="type">bool</span> QPersistentModelIndex::<span class="name">isValid</span> () const</h3>
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<p>Returns true if this persistent model index is valid; otherwise returns false.</p>
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<p>A valid index belongs to a model, and has non-negative row and column numbers.</p>
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<p><b>See also </b><a href="qpersistentmodelindex.html#model">model</a>(), <a href="qpersistentmodelindex.html#row">row</a>(), and <a href="qpersistentmodelindex.html#column">column</a>().</p>
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<!-- @@@isValid -->
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<!-- $$$model[overload1]$$$model -->
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<h3 class="fn"><a name="model"></a>const <span class="type"><a href="qabstractitemmodel.html">QAbstractItemModel</a></span> * QPersistentModelIndex::<span class="name">model</span> () const</h3>
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<p>Returns the model that the index belongs to.</p>
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<!-- @@@model -->
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<!-- $$$parent[overload1]$$$parent -->
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<h3 class="fn"><a name="parent"></a><span class="type"><a href="qmodelindex.html">QModelIndex</a></span> QPersistentModelIndex::<span class="name">parent</span> () const</h3>
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<p>Returns the parent <a href="qmodelindex.html">QModelIndex</a> for this persistent index, or an invalid <a href="qmodelindex.html">QModelIndex</a> if it has no parent.</p>
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<p><b>See also </b><a href="qpersistentmodelindex.html#child">child</a>(), <a href="qpersistentmodelindex.html#sibling">sibling</a>(), and <a href="qpersistentmodelindex.html#model">model</a>().</p>
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<!-- @@@parent -->
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<!-- $$$row[overload1]$$$row -->
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<h3 class="fn"><a name="row"></a><span class="type">int</span> QPersistentModelIndex::<span class="name">row</span> () const</h3>
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<p>Returns the row this persistent model index refers to.</p>
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<!-- @@@row -->
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<!-- $$$sibling[overload1]$$$siblingintint -->
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<h3 class="fn"><a name="sibling"></a><span class="type"><a href="qmodelindex.html">QModelIndex</a></span> QPersistentModelIndex::<span class="name">sibling</span> ( <span class="type">int</span> <i>row</i>, <span class="type">int</span> <i>column</i> ) const</h3>
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<p>Returns the sibling at <i>row</i> and <i>column</i> or an invalid <a href="qmodelindex.html">QModelIndex</a> if there is no sibling at this position.</p>
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<p><b>See also </b><a href="qpersistentmodelindex.html#parent">parent</a>() and <a href="qpersistentmodelindex.html#child">child</a>().</p>
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<!-- @@@sibling -->
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<!-- $$$operator const QModelIndex &[overload1]$$$operator const QModelIndex & -->
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<h3 class="fn"><a name="operator-const-QModelIndex--and"></a>QPersistentModelIndex::<span class="name">operator const QModelIndex &</span> () const</h3>
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<p>Cast operator that returns a const <a href="qmodelindex.html">QModelIndex</a>&.</p>
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<!-- @@@operator const QModelIndex & -->
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<!-- $$$operator!=[overload1]$$$operator!=constQPersistentModelIndex& -->
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<h3 class="fn"><a name="operator-not-eq"></a><span class="type">bool</span> QPersistentModelIndex::<span class="name">operator!=</span> ( const <span class="type">QPersistentModelIndex</span> & <i>other</i> ) const</h3>
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<p>Returns true if this persistent model index is not equal to the <i>other</i> persistent model index; otherwise returns false.</p>
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<p>This function was introduced in Qt 4.2.</p>
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<!-- @@@operator!= -->
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<!-- $$$operator!=$$$operator!=constQModelIndex& -->
|
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<h3 class="fn"><a name="operator-not-eq-2"></a><span class="type">bool</span> QPersistentModelIndex::<span class="name">operator!=</span> ( const <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> & <i>other</i> ) const</h3>
|
|
<p>Returns true if this persistent model index does not refer to the same location as the <i>other</i> model index; otherwise returns false.</p>
|
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<!-- @@@operator!= -->
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<!-- $$$operator<[overload1]$$$operator<constQPersistentModelIndex& -->
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<h3 class="fn"><a name="operator-lt"></a><span class="type">bool</span> QPersistentModelIndex::<span class="name">operator<</span> ( const <span class="type">QPersistentModelIndex</span> & <i>other</i> ) const</h3>
|
|
<p>Returns true if this persistent model index is smaller than the <i>other</i> persistent model index; otherwise returns false.</p>
|
|
<p>All values in the persistent model index are used when comparing with another persistent model index.</p>
|
|
<p>This function was introduced in Qt 4.1.</p>
|
|
<!-- @@@operator< -->
|
|
<!-- $$$operator=[overload1]$$$operator=constQPersistentModelIndex& -->
|
|
<h3 class="fn"><a name="operator-eq"></a><span class="type">QPersistentModelIndex</span> & QPersistentModelIndex::<span class="name">operator=</span> ( const <span class="type">QPersistentModelIndex</span> & <i>other</i> )</h3>
|
|
<p>Sets the persistent model index to refer to the same item in a model as the <i>other</i> persistent model index.</p>
|
|
<!-- @@@operator= -->
|
|
<!-- $$$operator=$$$operator=constQModelIndex& -->
|
|
<h3 class="fn"><a name="operator-eq-2"></a><span class="type">QPersistentModelIndex</span> & QPersistentModelIndex::<span class="name">operator=</span> ( const <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> & <i>other</i> )</h3>
|
|
<p>Sets the persistent model index to refer to the same item in a model as the <i>other</i> model index.</p>
|
|
<!-- @@@operator= -->
|
|
<!-- $$$operator==[overload1]$$$operator==constQPersistentModelIndex& -->
|
|
<h3 class="fn"><a name="operator-eq-eq"></a><span class="type">bool</span> QPersistentModelIndex::<span class="name">operator==</span> ( const <span class="type">QPersistentModelIndex</span> & <i>other</i> ) const</h3>
|
|
<p>Returns true if this persistent model index is equal to the <i>other</i> persistent model index; otherwise returns false.</p>
|
|
<p>All values in the persistent model index are used when comparing with another persistent model index.</p>
|
|
<!-- @@@operator== -->
|
|
<!-- $$$operator==$$$operator==constQModelIndex& -->
|
|
<h3 class="fn"><a name="operator-eq-eq-2"></a><span class="type">bool</span> QPersistentModelIndex::<span class="name">operator==</span> ( const <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> & <i>other</i> ) const</h3>
|
|
<p>Returns true if this persistent model index refers to the same location as the <i>other</i> model index; otherwise returns false.</p>
|
|
<p>All values in the persistent model index are used when comparing with another model index.</p>
|
|
<!-- @@@operator== -->
|
|
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