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<h1 class="title">QMultiMap Class Reference</h1>
<!-- $$$QMultiMap-brief -->
<p>The QMultiMap class is a convenience <a href="qmap.html">QMap</a> subclass that provides multi-valued maps. <a href="#details">More...</a></p>
<!-- @@@QMultiMap -->
<pre class="cpp"> <span class="preprocessor">#include <QMultiMap></span></pre><p><b>Inherits: </b><a href="qmap.html">QMap<Key, T></a>.</p>
<p><b>Note:</b> All functions in this class are <a href="threads-reentrancy.html#reentrant">reentrant</a>.</p>
<ul>
<li><a href="qmultimap-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="public-functions"></a>
<h2>Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#QMultiMap">QMultiMap</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#QMultiMap-2">QMultiMap</a></b> ( const QMap<Key, T> & <i>other</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QMap<Key, T>::const_iterator </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#constFind">constFind</a></b> ( const Key & <i>key</i>, const T & <i>value</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QMap<Key, T>::const_iterator </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#constFind-2">constFind</a></b> ( const Key & <i>key</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#contains">contains</a></b> ( const Key & <i>key</i>, const T & <i>value</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#contains-2">contains</a></b> ( const Key & <i>key</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#count">count</a></b> ( const Key & <i>key</i>, const T & <i>value</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#count-2">count</a></b> ( const Key & <i>key</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#count-3">count</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QMap<Key, T>::iterator </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#find">find</a></b> ( const Key & <i>key</i>, const T & <i>value</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QMap<Key, T>::iterator </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#find-2">find</a></b> ( const Key & <i>key</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QMap<Key, T>::const_iterator </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#find-3">find</a></b> ( const Key & <i>key</i>, const T & <i>value</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QMap<Key, T>::const_iterator </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#find-4">find</a></b> ( const Key & <i>key</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QMap<Key, T>::iterator </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#insert">insert</a></b> ( const Key & <i>key</i>, const T & <i>value</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#remove">remove</a></b> ( const Key & <i>key</i>, const T & <i>value</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#remove-2">remove</a></b> ( const Key & <i>key</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QMap<Key, T>::iterator </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#replace">replace</a></b> ( const Key & <i>key</i>, const T & <i>value</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#swap">swap</a></b> ( QMultiMap<Key, T> & <i>other</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QMultiMap </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#operator-2b">operator+</a></b> ( const QMultiMap & <i>other</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QMultiMap & </td><td class="memItemRight bottomAlign"><b><a href="qmultimap.html#operator-2b-eq">operator+=</a></b> ( const QMultiMap & <i>other</i> )</td></tr>
</table>
<ul>
<li class="fn">42 public functions inherited from <a href="qmap.html#public-functions">QMap</a></li>
</ul>
<a name="details"></a>
<!-- $$$QMultiMap-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The QMultiMap class is a convenience <a href="qmap.html">QMap</a> subclass that provides multi-valued maps.</p>
<p>QMultiMap<Key, T> is one of Qt's generic <a href="containers.html">container classes</a>. It inherits <a href="qmap.html">QMap</a> and extends it with a few convenience functions that make it more suitable than <a href="qmap.html">QMap</a> for storing multi-valued maps. A multi-valued map is a map that allows multiple values with the same key; <a href="qmap.html">QMap</a> normally doesn't allow that, unless you call <a href="qmap.html#insertMulti">QMap::insertMulti</a>().</p>
<p>Because QMultiMap inherits <a href="qmap.html">QMap</a>, all of <a href="qmap.html">QMap</a>'s functionality also applies to QMultiMap. For example, you can use <a href="qmap.html#isEmpty">isEmpty</a>() to test whether the map is empty, and you can traverse a QMultiMap using <a href="qmap.html">QMap</a>'s iterator classes (for example, <a href="qmapiterator.html">QMapIterator</a>). But in addition, it provides an <a href="qmultimap.html#insert">insert</a>() function that corresponds to <a href="qmap.html#insertMulti">QMap::insertMulti</a>(), and a <a href="qmultimap.html#replace">replace</a>() function that corresponds to <a href="qmap.html#insert">QMap::insert</a>(). It also provides convenient operator+() and operator+=().</p>
<p>Example:</p>
<pre class="cpp"> <span class="type">QMultiMap</span><span class="operator"><</span><span class="type"><a href="qstring.html">QString</a></span><span class="operator">,</span> <span class="type">int</span><span class="operator">></span> map1<span class="operator">,</span> map2<span class="operator">,</span> map3;
map1<span class="operator">.</span><a href="qmultimap.html#insert">insert</a>(<span class="string">"plenty"</span><span class="operator">,</span> <span class="number">100</span>);
map1<span class="operator">.</span><a href="qmultimap.html#insert">insert</a>(<span class="string">"plenty"</span><span class="operator">,</span> <span class="number">2000</span>);
<span class="comment">// map1.size() == 2</span>
map2<span class="operator">.</span><a href="qmultimap.html#insert">insert</a>(<span class="string">"plenty"</span><span class="operator">,</span> <span class="number">5000</span>);
<span class="comment">// map2.size() == 1</span>
map3 <span class="operator">=</span> map1 <span class="operator">+</span> map2;
<span class="comment">// map3.size() == 3</span></pre>
<p>Unlike <a href="qmap.html">QMap</a>, QMultiMap provides no operator[]. Use <a href="qmap.html#value">value</a>() or <a href="qmultimap.html#replace">replace</a>() if you want to access the most recently inserted item with a certain key.</p>
<p>If you want to retrieve all the values for a single key, you can use values(const Key &key), which returns a <a href="qlist.html">QList</a><T>:</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> values <span class="operator">=</span> map<span class="operator">.</span><a href="qmap.html#values">values</a>(<span class="string">"plenty"</span>);
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> values<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i)
cout <span class="operator"><</span><span class="operator"><</span> values<span class="operator">.</span>at(i) <span class="operator"><</span><span class="operator"><</span> endl;</pre>
<p>The items that share the same key are available from most recently to least recently inserted.</p>
<p>If you prefer the STL-style iterators, you can call <a href="qmultimap.html#find">find</a>() to get the iterator for the first item with a key and iterate from there:</p>
<pre class="cpp"> <span class="type">QMultiMap</span><span class="operator"><</span><span class="type"><a href="qstring.html">QString</a></span><span class="operator">,</span> <span class="type">int</span><span class="operator">></span><span class="operator">::</span>iterator i <span class="operator">=</span> map<span class="operator">.</span><a href="qmultimap.html#find">find</a>(<span class="string">"plenty"</span>);
<span class="keyword">while</span> (i <span class="operator">!</span><span class="operator">=</span> map<span class="operator">.</span>end() <span class="operator">&</span><span class="operator">&</span> i<span class="operator">.</span>key() <span class="operator">=</span><span class="operator">=</span> <span class="string">"plenty"</span>) {
cout <span class="operator"><</span><span class="operator"><</span> i<span class="operator">.</span>value() <span class="operator"><</span><span class="operator"><</span> endl;
<span class="operator">+</span><span class="operator">+</span>i;
}</pre>
<p>QMultiMap's key and value data types must be <a href="containers.html#assignable-data-types">assignable data types</a>. This covers most data types you are likely to encounter, but the compiler won't let you, for example, store a <a href="qwidget.html">QWidget</a> as a value; instead, store a <a href="qwidget.html">QWidget</a> *. In addition, QMultiMap's key type must provide operator<(). See the <a href="qmap.html">QMap</a> documentation for details.</p>
</div>
<p><b>See also </b><a href="qmap.html">QMap</a>, <a href="qmapiterator.html">QMapIterator</a>, <a href="qmutablemapiterator.html">QMutableMapIterator</a>, and <a href="qmultihash.html">QMultiHash</a>.</p>
<!-- @@@QMultiMap -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QMultiMap[overload1]$$$QMultiMap -->
<h3 class="fn"><a name="QMultiMap"></a>QMultiMap::<span class="name">QMultiMap</span> ()</h3>
<p>Constructs an empty map.</p>
<!-- @@@QMultiMap -->
<!-- $$$QMultiMap$$$QMultiMapconstQMap<Key,T>& -->
<h3 class="fn"><a name="QMultiMap-2"></a>QMultiMap::<span class="name">QMultiMap</span> ( const <span class="type"><a href="qmap.html">QMap</a></span><<span class="type">Key</span>, <span class="type">T</span>> & <i>other</i> )</h3>
<p>Constructs a copy of <i>other</i> (which can be a <a href="qmap.html">QMap</a> or a <a href="qmultimap.html">QMultiMap</a>).</p>
<p><b>See also </b><a href="qmap.html#operator-eq">operator=</a>().</p>
<!-- @@@QMultiMap -->
<!-- $$$constFind[overload1]$$$constFindconstKey&constT& -->
<h3 class="fn"><a name="constFind"></a><span class="type"><a href="qmap.html">QMap</a></span><<span class="type">Key</span>, <span class="type">T</span>><span class="type">::const_iterator</span> QMultiMap::<span class="name">constFind</span> ( const <span class="type">Key</span> & <i>key</i>, const <span class="type">T</span> & <i>value</i> ) const</h3>
<p>Returns an iterator pointing to the item with key <i>key</i> and the value <i>value</i> in the map.</p>
<p>If the map contains no such item, the function returns <a href="qmap.html#constEnd">constEnd</a>().</p>
<p>This function was introduced in Qt 4.3.</p>
<p><b>See also </b><a href="qmap.html#constFind">QMap::constFind</a>().</p>
<!-- @@@constFind -->
<!-- $$$constFind$$$constFindconstKey& -->
<h3 class="fn"><a name="constFind-2"></a><span class="type"><a href="qmap.html">QMap</a></span><<span class="type">Key</span>, <span class="type">T</span>><span class="type">::const_iterator</span> QMultiMap::<span class="name">constFind</span> ( const <span class="type">Key</span> & <i>key</i> ) const</h3>
<p>This is an overloaded function.</p>
<p><b>See also </b><a href="qmap.html#constFind">QMap::constFind</a>().</p>
<!-- @@@constFind -->
<!-- $$$contains[overload1]$$$containsconstKey&constT& -->
<h3 class="fn"><a name="contains"></a><span class="type">bool</span> QMultiMap::<span class="name">contains</span> ( const <span class="type">Key</span> & <i>key</i>, const <span class="type">T</span> & <i>value</i> ) const</h3>
<p>Returns true if the map contains an item with key <i>key</i> and value <i>value</i>; otherwise returns false.</p>
<p>This function was introduced in Qt 4.3.</p>
<p><b>See also </b><a href="qmap.html#contains">QMap::contains</a>().</p>
<!-- @@@contains -->
<!-- $$$contains$$$containsconstKey& -->
<h3 class="fn"><a name="contains-2"></a><span class="type">bool</span> QMultiMap::<span class="name">contains</span> ( const <span class="type">Key</span> & <i>key</i> ) const</h3>
<p>This is an overloaded function.</p>
<p><b>See also </b><a href="qmap.html#contains">QMap::contains</a>().</p>
<!-- @@@contains -->
<!-- $$$count[overload1]$$$countconstKey&constT& -->
<h3 class="fn"><a name="count"></a><span class="type">int</span> QMultiMap::<span class="name">count</span> ( const <span class="type">Key</span> & <i>key</i>, const <span class="type">T</span> & <i>value</i> ) const</h3>
<p>Returns the number of items with key <i>key</i> and value <i>value</i>.</p>
<p>This function was introduced in Qt 4.3.</p>
<p><b>See also </b><a href="qmap.html#count">QMap::count</a>().</p>
<!-- @@@count -->
<!-- $$$count$$$countconstKey& -->
<h3 class="fn"><a name="count-2"></a><span class="type">int</span> QMultiMap::<span class="name">count</span> ( const <span class="type">Key</span> & <i>key</i> ) const</h3>
<p>This is an overloaded function.</p>
<p><b>See also </b><a href="qmap.html#count">QMap::count</a>().</p>
<!-- @@@count -->
<!-- $$$count$$$count -->
<h3 class="fn"><a name="count-3"></a><span class="type">int</span> QMultiMap::<span class="name">count</span> () const</h3>
<p>This is an overloaded function.</p>
<p><b>See also </b><a href="qmap.html#count">QMap::count</a>().</p>
<!-- @@@count -->
<!-- $$$find[overload1]$$$findconstKey&constT& -->
<h3 class="fn"><a name="find"></a><span class="type"><a href="qmap.html">QMap</a></span><<span class="type">Key</span>, <span class="type">T</span>><span class="type">::iterator</span> QMultiMap::<span class="name">find</span> ( const <span class="type">Key</span> & <i>key</i>, const <span class="type">T</span> & <i>value</i> )</h3>
<p>Returns an iterator pointing to the item with key <i>key</i> and value <i>value</i> in the map.</p>
<p>If the map contains no such item, the function returns <a href="qmap.html#end">end</a>().</p>
<p>If the map contains multiple items with key <i>key</i>, this function returns an iterator that points to the most recently inserted value.</p>
<p>This function was introduced in Qt 4.3.</p>
<p><b>See also </b><a href="qmap.html#find">QMap::find</a>().</p>
<!-- @@@find -->
<!-- $$$find$$$findconstKey& -->
<h3 class="fn"><a name="find-2"></a><span class="type"><a href="qmap.html">QMap</a></span><<span class="type">Key</span>, <span class="type">T</span>><span class="type">::iterator</span> QMultiMap::<span class="name">find</span> ( const <span class="type">Key</span> & <i>key</i> )</h3>
<p>This is an overloaded function.</p>
<p><b>See also </b><a href="qmap.html#find">QMap::find</a>().</p>
<!-- @@@find -->
<!-- $$$find$$$findconstKey&constT& -->
<h3 class="fn"><a name="find-3"></a><span class="type"><a href="qmap.html">QMap</a></span><<span class="type">Key</span>, <span class="type">T</span>><span class="type">::const_iterator</span> QMultiMap::<span class="name">find</span> ( const <span class="type">Key</span> & <i>key</i>, const <span class="type">T</span> & <i>value</i> ) const</h3>
<p>This is an overloaded function.</p>
<p>Returns a const iterator pointing to the item with the given <i>key</i> and <i>value</i> in the map.</p>
<p>If the map contains no such item, the function returns <a href="qmap.html#end">end</a>().</p>
<p>If the map contains multiple items with the specified <i>key</i>, this function returns a const iterator that points to the most recently inserted value.</p>
<p>This function was introduced in Qt 4.3.</p>
<p><b>See also </b><a href="qmap.html#find">QMap::find</a>().</p>
<!-- @@@find -->
<!-- $$$find$$$findconstKey& -->
<h3 class="fn"><a name="find-4"></a><span class="type"><a href="qmap.html">QMap</a></span><<span class="type">Key</span>, <span class="type">T</span>><span class="type">::const_iterator</span> QMultiMap::<span class="name">find</span> ( const <span class="type">Key</span> & <i>key</i> ) const</h3>
<p>This is an overloaded function.</p>
<p>This function was introduced in Qt 4.3.</p>
<p><b>See also </b><a href="qmap.html#find">QMap::find</a>().</p>
<!-- @@@find -->
<!-- $$$insert[overload1]$$$insertconstKey&constT& -->
<h3 class="fn"><a name="insert"></a><span class="type"><a href="qmap.html">QMap</a></span><<span class="type">Key</span>, <span class="type">T</span>><span class="type">::iterator</span> QMultiMap::<span class="name">insert</span> ( const <span class="type">Key</span> & <i>key</i>, const <span class="type">T</span> & <i>value</i> )</h3>
<p>Inserts a new item with the key <i>key</i> and a value of <i>value</i>.</p>
<p>If there is already an item with the same key in the map, this function will simply create a new one. (This behavior is different from <a href="qmultimap.html#replace">replace</a>(), which overwrites the value of an existing item.)</p>
<p><b>See also </b><a href="qmultimap.html#replace">replace</a>().</p>
<!-- @@@insert -->
<!-- $$$remove[overload1]$$$removeconstKey&constT& -->
<h3 class="fn"><a name="remove"></a><span class="type">int</span> QMultiMap::<span class="name">remove</span> ( const <span class="type">Key</span> & <i>key</i>, const <span class="type">T</span> & <i>value</i> )</h3>
<p>Removes all the items that have the key <i>key</i> and the value <i>value</i> from the map. Returns the number of items removed.</p>
<p>This function was introduced in Qt 4.3.</p>
<p><b>See also </b><a href="qmap.html#remove">QMap::remove</a>().</p>
<!-- @@@remove -->
<!-- $$$remove$$$removeconstKey& -->
<h3 class="fn"><a name="remove-2"></a><span class="type">int</span> QMultiMap::<span class="name">remove</span> ( const <span class="type">Key</span> & <i>key</i> )</h3>
<p>This is an overloaded function.</p>
<p><b>See also </b><a href="qmap.html#remove">QMap::remove</a>().</p>
<!-- @@@remove -->
<!-- $$$replace[overload1]$$$replaceconstKey&constT& -->
<h3 class="fn"><a name="replace"></a><span class="type"><a href="qmap.html">QMap</a></span><<span class="type">Key</span>, <span class="type">T</span>><span class="type">::iterator</span> QMultiMap::<span class="name">replace</span> ( const <span class="type">Key</span> & <i>key</i>, const <span class="type">T</span> & <i>value</i> )</h3>
<p>Inserts a new item with the key <i>key</i> and a value of <i>value</i>.</p>
<p>If there is already an item with the key <i>key</i>, that item's value is replaced with <i>value</i>.</p>
<p>If there are multiple items with the key <i>key</i>, the most recently inserted item's value is replaced with <i>value</i>.</p>
<p><b>See also </b><a href="qmultimap.html#insert">insert</a>().</p>
<!-- @@@replace -->
<!-- $$$swap[overload1]$$$swapQMultiMap<Key,T>& -->
<h3 class="fn"><a name="swap"></a><span class="type">void</span> QMultiMap::<span class="name">swap</span> ( <span class="type">QMultiMap</span><<span class="type">Key</span>, <span class="type">T</span>> & <i>other</i> )</h3>
<p>Swaps map <i>other</i> with this map. This operation is very fast and never fails.</p>
<p>This function was introduced in Qt 4.8.</p>
<!-- @@@swap -->
<!-- $$$operator+[overload1]$$$operator+constQMultiMap& -->
<h3 class="fn"><a name="operator-2b"></a><span class="type">QMultiMap</span> QMultiMap::<span class="name">operator+</span> ( const <span class="type">QMultiMap</span> & <i>other</i> ) const</h3>
<p>Returns a map that contains all the items in this map in addition to all the items in <i>other</i>. If a key is common to both maps, the resulting map will contain the key multiple times.</p>
<p><b>See also </b><a href="qmultimap.html#operator-2b-eq">operator+=</a>().</p>
<!-- @@@operator+ -->
<!-- $$$operator+=[overload1]$$$operator+=constQMultiMap& -->
<h3 class="fn"><a name="operator-2b-eq"></a><span class="type">QMultiMap</span> & QMultiMap::<span class="name">operator+=</span> ( const <span class="type">QMultiMap</span> & <i>other</i> )</h3>
<p>Inserts all the items in the <i>other</i> map into this map and returns a reference to this map.</p>
<p><b>See also </b><a href="qmultimap.html#insert">insert</a>() and <a href="qmultimap.html#operator-2b">operator+</a>().</p>
<!-- @@@operator+= -->
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