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<h1 class="title">Q3PtrDict Class Reference</h1>
<!-- $$$Q3PtrDict-brief -->
<p>The Q3PtrDict class is a template class that provides a dictionary based on void* keys. <a href="#details">More...</a></p>
<!-- @@@Q3PtrDict -->
<pre class="cpp"> <span class="preprocessor">#include <Q3PtrDict></span></pre><p><b>This class is part of the Qt 3 support library.</b> It is provided to keep old source code working. We strongly advise against using it in new code. See <a href="porting4.html">Porting to Qt 4</a> for more information.</p>
<p><b>Inherits: </b><a href="q3ptrcollection.html">Q3PtrCollection</a>.</p>
<ul>
<li><a href="q3ptrdict-members.html">List of all members, including inherited members</a></li>
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<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="q3ptrdict.html#Q3PtrDict">Q3PtrDict</a></b> ( int <i>size</i> = 17 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="q3ptrdict.html#Q3PtrDict-2">Q3PtrDict</a></b> ( const Q3PtrDict<type> & <i>dict</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="q3ptrdict.html#dtor.Q3PtrDict">~Q3PtrDict</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> type * </td><td class="memItemRight bottomAlign"><b><a href="q3ptrdict.html#find">find</a></b> ( void * <i>key</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="q3ptrdict.html#insert">insert</a></b> ( void * <i>key</i>, const type * <i>item</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="q3ptrdict.html#isEmpty">isEmpty</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="q3ptrdict.html#remove">remove</a></b> ( void * <i>key</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="q3ptrdict.html#replace">replace</a></b> ( void * <i>key</i>, const type * <i>item</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="q3ptrdict.html#resize">resize</a></b> ( uint <i>newsize</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> uint </td><td class="memItemRight bottomAlign"><b><a href="q3ptrdict.html#size">size</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="q3ptrdict.html#statistics">statistics</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> type * </td><td class="memItemRight bottomAlign"><b><a href="q3ptrdict.html#take">take</a></b> ( void * <i>key</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> Q3PtrDict<type> & </td><td class="memItemRight bottomAlign"><b><a href="q3ptrdict.html#operator-eq">operator=</a></b> ( const Q3PtrDict<type> & <i>dict</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> type * </td><td class="memItemRight bottomAlign"><b><a href="q3ptrdict.html#operator-5b-5d">operator[]</a></b> ( void * <i>key</i> ) const</td></tr>
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<a name="reimplemented-public-functions"></a>
<h2>Reimplemented Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="q3ptrdict.html#clear">clear</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual uint </td><td class="memItemRight bottomAlign"><b><a href="q3ptrdict.html#count">count</a></b> () const</td></tr>
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<ul>
<li class="fn">4 public functions inherited from <a href="q3ptrcollection.html#public-functions">Q3PtrCollection</a></li>
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<a name="protected-functions"></a>
<h2>Protected Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual QDataStream & </td><td class="memItemRight bottomAlign"><b><a href="q3ptrdict.html#read">read</a></b> ( QDataStream & <i>s</i>, Q3PtrCollection::Item & <i>item</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QDataStream & </td><td class="memItemRight bottomAlign"><b><a href="q3ptrdict.html#write">write</a></b> ( QDataStream & <i>s</i>, Q3PtrCollection::Item <i>item</i> ) const</td></tr>
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<li class="fn">2 protected functions inherited from <a href="q3ptrcollection.html#protected-functions">Q3PtrCollection</a></li>
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<a name="details"></a>
<!-- $$$Q3PtrDict-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The Q3PtrDict class is a template class that provides a dictionary based on void* keys.</p>
<p>Q3PtrDict is implemented as a template class. Define a template instance Q3PtrDict<X> to create a dictionary that operates on pointers to X (X*).</p>
<p>A dictionary is a collection of key-value pairs. The key is a void* used for insertion, removal and lookup. The value is a pointer. Dictionaries provide very fast insertion and lookup.</p>
<p>Example:</p>
<pre class="cpp"> <span class="type">Q3PtrDict</span><span class="operator"><</span><span class="type">char</span><span class="operator">></span> fields; <span class="comment">// void* keys, char* values</span>
<span class="type"><a href="qlineedit.html">QLineEdit</a></span> <span class="operator">*</span>le1 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineedit.html">QLineEdit</a></span>( <span class="keyword">this</span> );
le1<span class="operator">-</span><span class="operator">></span>setText( <span class="string">"Simpson"</span> );
<span class="type"><a href="qlineedit.html">QLineEdit</a></span> <span class="operator">*</span>le2 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineedit.html">QLineEdit</a></span>( <span class="keyword">this</span> );
le2<span class="operator">-</span><span class="operator">></span>setText( <span class="string">"Homer"</span> );
<span class="type"><a href="qlineedit.html">QLineEdit</a></span> <span class="operator">*</span>le3 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineedit.html">QLineEdit</a></span>( <span class="keyword">this</span> );
le3<span class="operator">-</span><span class="operator">></span>setText( <span class="string">"45"</span> );
fields<span class="operator">.</span><a href="q3ptrdict.html#insert">insert</a>( le1<span class="operator">,</span> <span class="string">"Surname"</span> );
fields<span class="operator">.</span><a href="q3ptrdict.html#insert">insert</a>( le2<span class="operator">,</span> <span class="string">"Forename"</span> );
fields<span class="operator">.</span><a href="q3ptrdict.html#insert">insert</a>( le3<span class="operator">,</span> <span class="string">"Age"</span> );
<span class="type"><a href="q3ptrdictiterator.html">Q3PtrDictIterator</a></span><span class="operator"><</span><span class="type">char</span><span class="operator">></span> it( fields );
<span class="keyword">for</span>( ; it<span class="operator">.</span>current(); <span class="operator">+</span><span class="operator">+</span>it )
cout <span class="operator"><</span><span class="operator"><</span> it<span class="operator">.</span>current() <span class="operator"><</span><span class="operator"><</span> endl;
cout <span class="operator"><</span><span class="operator"><</span> endl;
<span class="keyword">if</span> ( fields<span class="operator">[</span>le1<span class="operator">]</span> ) <span class="comment">// Prints "Surname: Simpson"</span>
cout <span class="operator"><</span><span class="operator"><</span> fields<span class="operator">[</span>le1<span class="operator">]</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">": "</span> <span class="operator"><</span><span class="operator"><</span> le1<span class="operator">-</span><span class="operator">></span>text() <span class="operator"><</span><span class="operator"><</span> endl;
<span class="keyword">if</span> ( fields<span class="operator">[</span>le2<span class="operator">]</span> ) <span class="comment">// Prints "Forename: Homer"</span>
cout <span class="operator"><</span><span class="operator"><</span> fields<span class="operator">[</span>le2<span class="operator">]</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">": "</span> <span class="operator"><</span><span class="operator"><</span> le2<span class="operator">-</span><span class="operator">></span>text() <span class="operator"><</span><span class="operator"><</span> endl;
fields<span class="operator">.</span><a href="q3ptrdict.html#remove">remove</a>( le1 ); <span class="comment">// Removes le1 from the dictionary</span>
cout <span class="operator"><</span><span class="operator"><</span> le1<span class="operator">-</span><span class="operator">></span>text() <span class="operator"><</span><span class="operator"><</span> endl; <span class="comment">// Prints "Simpson"</span></pre>
<p>In this example we use a dictionary to add an extra property (a char*) to the line edits we're using.</p>
<p>See <a href="q3dict.html">Q3Dict</a> for full details, including the choice of dictionary size, and how deletions are handled.</p>
</div>
<p><b>See also </b><a href="q3ptrdictiterator.html">Q3PtrDictIterator</a>, <a href="q3dict.html">Q3Dict</a>, <a href="q3asciidict.html">Q3AsciiDict</a>, and <a href="q3intdict.html">Q3IntDict</a>.</p>
<!-- @@@Q3PtrDict -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$Q3PtrDict[overload1]$$$Q3PtrDictint -->
<h3 class="fn"><a name="Q3PtrDict"></a>Q3PtrDict::<span class="name">Q3PtrDict</span> ( <span class="type">int</span> <i>size</i> = 17 )</h3>
<p>Constructs a dictionary using an internal hash array with the size <i>size</i>.</p>
<p>Setting <i>size</i> to a suitably large prime number (equal to or greater than the expected number of entries) makes the hash distribution better and improves lookup performance.</p>
<!-- @@@Q3PtrDict -->
<!-- $$$Q3PtrDict$$$Q3PtrDictconstQ3PtrDict<type>& -->
<h3 class="fn"><a name="Q3PtrDict-2"></a>Q3PtrDict::<span class="name">Q3PtrDict</span> ( const <span class="type">Q3PtrDict</span><<span class="type">type</span>> & <i>dict</i> )</h3>
<p>Constructs a copy of <i>dict</i>.</p>
<p>Each item in <i>dict</i> is inserted into this dictionary. Only the pointers are copied (shallow copy).</p>
<!-- @@@Q3PtrDict -->
<!-- $$$~Q3PtrDict[overload1]$$$~Q3PtrDict -->
<h3 class="fn"><a name="dtor.Q3PtrDict"></a>Q3PtrDict::<span class="name">~Q3PtrDict</span> ()</h3>
<p>Removes all items from the dictionary and destroys it.</p>
<p>All iterators that access this dictionary will be reset.</p>
<p><b>See also </b><a href="q3ptrcollection.html#setAutoDelete">setAutoDelete</a>().</p>
<!-- @@@~Q3PtrDict -->
<!-- $$$clear[overload1]$$$clear -->
<h3 class="fn"><a name="clear"></a><span class="type">void</span> Q3PtrDict::<span class="name">clear</span> ()<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="q3ptrcollection.html#clear">Q3PtrCollection::clear</a>().</p>
<p>Removes all items from the dictionary.</p>
<p>The removed items are deleted if <a href="q3ptrcollection.html#setAutoDelete">auto-deletion</a> is enabled.</p>
<p>All dictionary iterators that access this dictionary will be reset.</p>
<p><b>See also </b><a href="q3ptrdict.html#remove">remove</a>(), <a href="q3ptrdict.html#take">take</a>(), and <a href="q3ptrcollection.html#setAutoDelete">setAutoDelete</a>().</p>
<!-- @@@clear -->
<!-- $$$count[overload1]$$$count -->
<h3 class="fn"><a name="count"></a><span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> Q3PtrDict::<span class="name">count</span> () const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="q3ptrcollection.html#count">Q3PtrCollection::count</a>().</p>
<p>Returns the number of items in the dictionary.</p>
<p><b>See also </b><a href="q3ptrdict.html#isEmpty">isEmpty</a>().</p>
<!-- @@@count -->
<!-- $$$find[overload1]$$$findvoid* -->
<h3 class="fn"><a name="find"></a><span class="type">type</span> * Q3PtrDict::<span class="name">find</span> ( <span class="type">void</span> * <i>key</i> ) const</h3>
<p>Returns the item associated with <i>key</i>, or 0 if the key does not exist in the dictionary.</p>
<p>If there are two or more items with equal keys, then the most recently inserted item will be found.</p>
<p>Equivalent to operator[].</p>
<p><b>See also </b><a href="q3ptrdict.html#operator-5b-5d">operator[]</a>().</p>
<!-- @@@find -->
<!-- $$$insert[overload1]$$$insertvoid*consttype* -->
<h3 class="fn"><a name="insert"></a><span class="type">void</span> Q3PtrDict::<span class="name">insert</span> ( <span class="type">void</span> * <i>key</i>, const <span class="type">type</span> * <i>item</i> )</h3>
<p>Inserts the <i>key</i> with the <i>item</i> into the dictionary.</p>
<p>Multiple items can have the same key, in which case only the last item will be accessible using <a href="q3ptrdict.html#operator-5b-5d">operator[]</a>().</p>
<p><i>item</i> may not be 0.</p>
<p><b>See also </b><a href="q3ptrdict.html#replace">replace</a>().</p>
<!-- @@@insert -->
<!-- $$$isEmpty[overload1]$$$isEmpty -->
<h3 class="fn"><a name="isEmpty"></a><span class="type">bool</span> Q3PtrDict::<span class="name">isEmpty</span> () const</h3>
<p>Returns TRUE if the dictionary is empty; otherwise returns FALSE.</p>
<p><b>See also </b><a href="q3ptrdict.html#count">count</a>().</p>
<!-- @@@isEmpty -->
<!-- $$$read[overload1]$$$readQDataStream&Q3PtrCollection::Item& -->
<h3 class="fn"><a name="read"></a><span class="type"><a href="qdatastream.html">QDataStream</a></span> & Q3PtrDict::<span class="name">read</span> ( <span class="type"><a href="qdatastream.html">QDataStream</a></span> & <i>s</i>, <span class="type"><a href="q3ptrcollection.html#Item-typedef">Q3PtrCollection::Item</a></span> & <i>item</i> )<tt> [virtual protected]</tt></h3>
<p>Reads a dictionary item from the stream <i>s</i> and returns a reference to the stream.</p>
<p>The default implementation sets <i>item</i> to 0.</p>
<p><b>See also </b><a href="q3ptrdict.html#write">write</a>().</p>
<!-- @@@read -->
<!-- $$$remove[overload1]$$$removevoid* -->
<h3 class="fn"><a name="remove"></a><span class="type">bool</span> Q3PtrDict::<span class="name">remove</span> ( <span class="type">void</span> * <i>key</i> )</h3>
<p>Removes the item associated with <i>key</i> from the dictionary. Returns TRUE if successful, i.e. if <i>key</i> is in the dictionary; otherwise returns FALSE.</p>
<p>If there are two or more items with equal keys, then the most recently inserted item will be removed.</p>
<p>The removed item is deleted if <a href="q3ptrcollection.html#setAutoDelete">auto-deletion</a> is enabled.</p>
<p>All dictionary iterators that refer to the removed item will be set to point to the next item in the dictionary traversal order.</p>
<p><b>See also </b><a href="q3ptrdict.html#take">take</a>(), <a href="q3ptrdict.html#clear">clear</a>(), and <a href="q3ptrcollection.html#setAutoDelete">setAutoDelete</a>().</p>
<!-- @@@remove -->
<!-- $$$replace[overload1]$$$replacevoid*consttype* -->
<h3 class="fn"><a name="replace"></a><span class="type">void</span> Q3PtrDict::<span class="name">replace</span> ( <span class="type">void</span> * <i>key</i>, const <span class="type">type</span> * <i>item</i> )</h3>
<p>If the dictionary has key <i>key</i>, this key's item is replaced with <i>item</i>. If the dictionary doesn't contain key <i>key</i>, <i>item</i> is inserted into the dictionary using key <i>key</i>.</p>
<p><i>item</i> may not be 0.</p>
<p>Equivalent to</p>
<pre class="cpp"> <span class="type"><a href="q3ptrdict.html">Q3PtrDict</a></span><span class="operator"><</span>ItemType<span class="operator">></span> dict;
<span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>
<span class="keyword">if</span> ( dict<span class="operator">.</span>find( key ) )
dict<span class="operator">.</span><a href="q3ptrdict.html#remove">remove</a>( key );
dict<span class="operator">.</span><a href="q3ptrdict.html#insert">insert</a>( key<span class="operator">,</span> item );</pre>
<p>If there are two or more items with equal keys, then the most recently inserted item will be replaced.</p>
<p><b>See also </b><a href="q3ptrdict.html#insert">insert</a>().</p>
<!-- @@@replace -->
<!-- $$$resize[overload1]$$$resizeuint -->
<h3 class="fn"><a name="resize"></a><span class="type">void</span> Q3PtrDict::<span class="name">resize</span> ( <span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> <i>newsize</i> )</h3>
<p>Changes the size of the hash table to <i>newsize</i>. The contents of the dictionary are preserved, but all iterators on the dictionary become invalid.</p>
<!-- @@@resize -->
<!-- $$$size[overload1]$$$size -->
<h3 class="fn"><a name="size"></a><span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> Q3PtrDict::<span class="name">size</span> () const</h3>
<p>Returns the size of the internal hash table (as specified in the constructor).</p>
<p><b>See also </b><a href="q3ptrdict.html#count">count</a>().</p>
<!-- @@@size -->
<!-- $$$statistics[overload1]$$$statistics -->
<h3 class="fn"><a name="statistics"></a><span class="type">void</span> Q3PtrDict::<span class="name">statistics</span> () const</h3>
<p>Debugging-only function that prints out the dictionary distribution using <a href="qtglobal.html#qDebug">qDebug</a>().</p>
<!-- @@@statistics -->
<!-- $$$take[overload1]$$$takevoid* -->
<h3 class="fn"><a name="take"></a><span class="type">type</span> * Q3PtrDict::<span class="name">take</span> ( <span class="type">void</span> * <i>key</i> )</h3>
<p>Takes the item associated with <i>key</i> out of the dictionary without deleting it (even if <a href="q3ptrcollection.html#setAutoDelete">auto-deletion</a> is enabled).</p>
<p>If there are two or more items with equal keys, then the most recently inserted item will be removed.</p>
<p>Returns a pointer to the item taken out, or 0 if the key does not exist in the dictionary.</p>
<p>All dictionary iterators that refer to the taken item will be set to point to the next item in the dictionary traversal order.</p>
<p><b>See also </b><a href="q3ptrdict.html#remove">remove</a>(), <a href="q3ptrdict.html#clear">clear</a>(), and <a href="q3ptrcollection.html#setAutoDelete">setAutoDelete</a>().</p>
<!-- @@@take -->
<!-- $$$write[overload1]$$$writeQDataStream&Q3PtrCollection::Item -->
<h3 class="fn"><a name="write"></a><span class="type"><a href="qdatastream.html">QDataStream</a></span> & Q3PtrDict::<span class="name">write</span> ( <span class="type"><a href="qdatastream.html">QDataStream</a></span> & <i>s</i>, <span class="type"><a href="q3ptrcollection.html#Item-typedef">Q3PtrCollection::Item</a></span> <i>item</i> ) const<tt> [virtual protected]</tt></h3>
<p>Writes a dictionary <i>item</i> to the stream <i>s</i> and returns a reference to the stream.</p>
<p><b>See also </b><a href="q3ptrdict.html#read">read</a>().</p>
<!-- @@@write -->
<!-- $$$operator=[overload1]$$$operator=constQ3PtrDict<type>& -->
<h3 class="fn"><a name="operator-eq"></a><span class="type">Q3PtrDict</span><<span class="type">type</span>> & Q3PtrDict::<span class="name">operator=</span> ( const <span class="type">Q3PtrDict</span><<span class="type">type</span>> & <i>dict</i> )</h3>
<p>Assigns <i>dict</i> to this dictionary and returns a reference to this dictionary.</p>
<p>This dictionary is first cleared and then each item in <i>dict</i> is inserted into the dictionary. Only the pointers are copied (shallow copy), unless <a href="q3ptrcollection.html#newItem">newItem</a>() has been reimplemented.</p>
<!-- @@@operator= -->
<!-- $$$operator[][overload1]$$$operator[]void* -->
<h3 class="fn"><a name="operator-5b-5d"></a><span class="type">type</span> * Q3PtrDict::<span class="name">operator[]</span> ( <span class="type">void</span> * <i>key</i> ) const</h3>
<p>Returns the item associated with <i>key</i>, or 0 if the key does not exist in the dictionary.</p>
<p>If there are two or more items with equal keys, then the most recently inserted item will be found.</p>
<p>Equivalent to the <a href="q3ptrdict.html#find">find</a>() function.</p>
<p><b>See also </b><a href="q3ptrdict.html#find">find</a>().</p>
<!-- @@@operator[] -->
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