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<h1 class="title">iterator Class Reference</h1>
<span class="small-subtitle">(QHash::iterator)<br/></span>
<!-- $$$iterator-brief -->
<p>The QHash::iterator class provides an STL-style non-const iterator for <a href="qhash.html">QHash</a> and <a href="qmultihash.html">QMultiHash</a>. <a href="#details">More...</a></p>
<!-- @@@iterator -->
<pre class="cpp"> <span class="preprocessor">#include <<a href="qhash.html">QHash</a>></span></pre><ul>
<li><a href="qhash-iterator-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="qhash-iterator.html#iterator">iterator</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const Key & </td><td class="memItemRight bottomAlign"><b><a href="qhash-iterator.html#key">key</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> T & </td><td class="memItemRight bottomAlign"><b><a href="qhash-iterator.html#value">value</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qhash-iterator.html#operator-not-eq">operator!=</a></b> ( const iterator & <i>other</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qhash-iterator.html#operator-not-eq-2">operator!=</a></b> ( const const_iterator & <i>other</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> T & </td><td class="memItemRight bottomAlign"><b><a href="qhash-iterator.html#operator-2a">operator*</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> iterator </td><td class="memItemRight bottomAlign"><b><a href="qhash-iterator.html#operator-2b">operator+</a></b> ( int <i>j</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> iterator & </td><td class="memItemRight bottomAlign"><b><a href="qhash-iterator.html#operator-2b-2b">operator++</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> iterator </td><td class="memItemRight bottomAlign"><b><a href="qhash-iterator.html#operator-2b-2b-2">operator++</a></b> ( int )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> iterator & </td><td class="memItemRight bottomAlign"><b><a href="qhash-iterator.html#operator-2b-eq">operator+=</a></b> ( int <i>j</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> iterator </td><td class="memItemRight bottomAlign"><b><a href="qhash-iterator.html#operator-">operator-</a></b> ( int <i>j</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> iterator & </td><td class="memItemRight bottomAlign"><b><a href="qhash-iterator.html#operator--">operator--</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> iterator </td><td class="memItemRight bottomAlign"><b><a href="qhash-iterator.html#operator---2">operator--</a></b> ( int )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> iterator & </td><td class="memItemRight bottomAlign"><b><a href="qhash-iterator.html#operator--eq">operator-=</a></b> ( int <i>j</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> T * </td><td class="memItemRight bottomAlign"><b><a href="qhash-iterator.html#operator--gt">operator-></a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qhash-iterator.html#operator-eq-eq">operator==</a></b> ( const iterator & <i>other</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qhash-iterator.html#operator-eq-eq-2">operator==</a></b> ( const const_iterator & <i>other</i> ) const</td></tr>
</table>
<a name="details"></a>
<!-- $$$iterator-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The QHash::iterator class provides an STL-style non-const iterator for <a href="qhash.html">QHash</a> and <a href="qmultihash.html">QMultiHash</a>.</p>
<p><a href="qhash.html">QHash</a> features both <a href="containers.html#stl-style-iterators">STL-style iterators</a> and <a href="containers.html#java-style-iterators">Java-style iterators</a>. The STL-style iterators are more low-level and more cumbersome to use; on the other hand, they are slightly faster and, for developers who already know STL, have the advantage of familiarity.</p>
<p><a href="qhash.html">QHash</a><Key, T>::iterator allows you to iterate over a <a href="qhash.html">QHash</a> (or <a href="qmultihash.html">QMultiHash</a>) and to modify the value (but not the key) associated with a particular key. If you want to iterate over a const <a href="qhash.html">QHash</a>, you should use <a href="qhash-const-iterator.html">QHash::const_iterator</a>. It is generally good practice to use <a href="qhash-const-iterator.html">QHash::const_iterator</a> on a non-const <a href="qhash.html">QHash</a> as well, unless you need to change the <a href="qhash.html">QHash</a> through the iterator. Const iterators are slightly faster, and can improve code readability.</p>
<p>The default QHash::iterator constructor creates an uninitialized iterator. You must initialize it using a <a href="qhash.html">QHash</a> function like <a href="qhash.html#begin">QHash::begin</a>(), <a href="qhash.html#end">QHash::end</a>(), or <a href="qhash.html#find">QHash::find</a>() before you can start iterating. Here's a typical loop that prints all the (key, value) pairs stored in a hash:</p>
<pre class="cpp"> <span class="type"><a href="qhash.html">QHash</a></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> hash;
hash<span class="operator">.</span><a href="qhash.html#insert">insert</a>(<span class="string">"January"</span><span class="operator">,</span> <span class="number">1</span>);
hash<span class="operator">.</span><a href="qhash.html#insert">insert</a>(<span class="string">"February"</span><span class="operator">,</span> <span class="number">2</span>);
<span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>
hash<span class="operator">.</span><a href="qhash.html#insert">insert</a>(<span class="string">"December"</span><span class="operator">,</span> <span class="number">12</span>);
<span class="type"><a href="qhash.html">QHash</a></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="keyword">for</span> (i <span class="operator">=</span> hash<span class="operator">.</span>begin(); i <span class="operator">!</span><span class="operator">=</span> hash<span class="operator">.</span>end(); <span class="operator">+</span><span class="operator">+</span>i)
cout <span class="operator"><</span><span class="operator"><</span> i<span class="operator">.</span><a href="qhash-iterator.html#key">key</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">": "</span> <span class="operator"><</span><span class="operator"><</span> i<span class="operator">.</span><a href="qhash-iterator.html#value">value</a>() <span class="operator"><</span><span class="operator"><</span> endl;</pre>
<p>Unlike <a href="qmap.html">QMap</a>, which orders its items by key, <a href="qhash.html">QHash</a> stores its items in an arbitrary order. The only guarantee is that items that share the same key (because they were inserted using <a href="qhash.html#insertMulti">QHash::insertMulti</a>()) will appear consecutively, from the most recently to the least recently inserted value.</p>
<p>Let's see a few examples of things we can do with a QHash::iterator that we cannot do with a <a href="qhash-const-iterator.html">QHash::const_iterator</a>. Here's an example that increments every value stored in the <a href="qhash.html">QHash</a> by 2:</p>
<pre class="cpp"> <span class="type"><a href="qhash.html">QHash</a></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="keyword">for</span> (i <span class="operator">=</span> hash<span class="operator">.</span>begin(); i <span class="operator">!</span><span class="operator">=</span> hash<span class="operator">.</span>end(); <span class="operator">+</span><span class="operator">+</span>i)
i<span class="operator">.</span><a href="qhash-iterator.html#value">value</a>() <span class="operator">+</span><span class="operator">=</span> <span class="number">2</span>;</pre>
<p>Here's an example that removes all the items whose key is a string that starts with an underscore character:</p>
<pre class="cpp"> <span class="type"><a href="qhash.html">QHash</a></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> hash<span class="operator">.</span><a href="qhash.html#begin">begin</a>();
<span class="keyword">while</span> (i <span class="operator">!</span><span class="operator">=</span> hash<span class="operator">.</span>end()) {
<span class="keyword">if</span> (i<span class="operator">.</span>key()<span class="operator">.</span>startsWith(<span class="string">"_"</span>))
i <span class="operator">=</span> hash<span class="operator">.</span>erase(i);
<span class="keyword">else</span>
<span class="operator">+</span><span class="operator">+</span>i;
}</pre>
<p>The call to <a href="qhash.html#erase">QHash::erase</a>() removes the item pointed to by the iterator from the hash, and returns an iterator to the next item. Here's another way of removing an item while iterating:</p>
<pre class="cpp"> <span class="type"><a href="qhash.html">QHash</a></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> hash<span class="operator">.</span><a href="qhash.html#begin">begin</a>();
<span class="keyword">while</span> (i <span class="operator">!</span><span class="operator">=</span> hash<span class="operator">.</span>end()) {
<span class="type"><a href="qhash.html">QHash</a></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 prev <span class="operator">=</span> i;
<span class="operator">+</span><span class="operator">+</span>i;
<span class="keyword">if</span> (prev<span class="operator">.</span>key()<span class="operator">.</span>startsWith(<span class="string">"_"</span>))
hash<span class="operator">.</span>erase(prev);
}</pre>
<p>It might be tempting to write code like this:</p>
<pre class="cpp"> <span class="comment">// WRONG</span>
<span class="keyword">while</span> (i <span class="operator">!</span><span class="operator">=</span> hash<span class="operator">.</span>end()) {
<span class="keyword">if</span> (i<span class="operator">.</span>key()<span class="operator">.</span>startsWith(<span class="string">"_"</span>))
hash<span class="operator">.</span>erase(i);
<span class="operator">+</span><span class="operator">+</span>i;
}</pre>
<p>However, this will potentially crash in <tt>++i</tt>, because <tt>i</tt> is a dangling iterator after the call to <a href="qhash.html#erase">erase</a>().</p>
<p>Multiple iterators can be used on the same hash. However, be aware that any modification performed directly on the <a href="qhash.html">QHash</a> has the potential of dramatically changing the order in which the items are stored in the hash, as they might cause <a href="qhash.html">QHash</a> to rehash its internal data structure. There is one notable exception: <a href="qhash.html#erase">QHash::erase</a>(). This function can safely be called while iterating, and won't affect the order of items in the hash. If you need to keep iterators over a long period of time, we recommend that you use <a href="qmap.html">QMap</a> rather than <a href="qhash.html">QHash</a>.</p>
</div>
<p><b>See also </b><a href="qhash-const-iterator.html">QHash::const_iterator</a> and <a href="qmutablehashiterator.html">QMutableHashIterator</a>.</p>
<!-- @@@iterator -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$iterator[overload1]$$$iterator -->
<h3 class="fn"><a name="iterator"></a>iterator::<span class="name">iterator</span> ()</h3>
<p>Constructs an uninitialized iterator.</p>
<p>Functions like <a href="qhash-iterator.html#key">key</a>(), <a href="qhash-iterator.html#value">value</a>(), and operator++() must not be called on an uninitialized iterator. Use operator=() to assign a value to it before using it.</p>
<p><b>See also </b><a href="qhash.html#begin">QHash::begin</a>() and <a href="qhash.html#end">QHash::end</a>().</p>
<!-- @@@iterator -->
<!-- $$$key[overload1]$$$key -->
<h3 class="fn"><a name="key"></a>const <span class="type">Key</span> & iterator::<span class="name">key</span> () const</h3>
<p>Returns the current item's key as a const reference.</p>
<p>There is no direct way of changing an item's key through an iterator, although it can be done by calling <a href="qhash.html#erase">QHash::erase</a>() followed by <a href="qhash.html#insert">QHash::insert</a>() or <a href="qhash.html#insertMulti">QHash::insertMulti</a>().</p>
<p><b>See also </b><a href="qhash-iterator.html#value">value</a>().</p>
<!-- @@@key -->
<!-- $$$value[overload1]$$$value -->
<h3 class="fn"><a name="value"></a><span class="type">T</span> & iterator::<span class="name">value</span> () const</h3>
<p>Returns a modifiable reference to the current item's value.</p>
<p>You can change the value of an item by using value() on the left side of an assignment, for example:</p>
<pre class="cpp"> <span class="keyword">if</span> (i<span class="operator">.</span>key() <span class="operator">=</span><span class="operator">=</span> <span class="string">"Hello"</span>)
i<span class="operator">.</span>value() <span class="operator">=</span> <span class="string">"Bonjour"</span>;</pre>
<p><b>See also </b><a href="qhash-iterator.html#key">key</a>() and <a href="qhash-iterator.html#operator-2a">operator*</a>().</p>
<!-- @@@value -->
<!-- $$$operator!=[overload1]$$$operator!=constiterator& -->
<h3 class="fn"><a name="operator-not-eq"></a><span class="type">bool</span> iterator::<span class="name">operator!=</span> ( const <span class="type">iterator</span> & <i>other</i> ) const</h3>
<p>Returns true if <i>other</i> points to a different item than this iterator; otherwise returns false.</p>
<p><b>See also </b><a href="qhash-iterator.html#operator-eq-eq">operator==</a>().</p>
<!-- @@@operator!= -->
<!-- $$$operator!=$$$operator!=constconst_iterator& -->
<h3 class="fn"><a name="operator-not-eq-2"></a><span class="type">bool</span> iterator::<span class="name">operator!=</span> ( const <span class="type"><a href="qhash-const-iterator.html">const_iterator</a></span> & <i>other</i> ) const</h3>
<p>Returns true if <i>other</i> points to a different item than this iterator; otherwise returns false.</p>
<p><b>See also </b><a href="qhash-iterator.html#operator-eq-eq">operator==</a>().</p>
<!-- @@@operator!= -->
<!-- $$$operator*[overload1]$$$operator* -->
<h3 class="fn"><a name="operator-2a"></a><span class="type">T</span> & iterator::<span class="name">operator*</span> () const</h3>
<p>Returns a modifiable reference to the current item's value.</p>
<p>Same as <a href="qhash-iterator.html#value">value</a>().</p>
<p><b>See also </b><a href="qhash-iterator.html#key">key</a>().</p>
<!-- @@@operator* -->
<!-- $$$operator+[overload1]$$$operator+int -->
<h3 class="fn"><a name="operator-2b"></a><span class="type">iterator</span> iterator::<span class="name">operator+</span> ( <span class="type">int</span> <i>j</i> ) const</h3>
<p>Returns an iterator to the item at <i>j</i> positions forward from this iterator. (If <i>j</i> is negative, the iterator goes backward.)</p>
<p>This operation can be slow for large <i>j</i> values.</p>
<p><b>See also </b><a href="qhash-iterator.html#operator-">operator-</a>().</p>
<!-- @@@operator+ -->
<!-- $$$operator++[overload1]$$$operator++ -->
<h3 class="fn"><a name="operator-2b-2b"></a><span class="type">iterator</span> & iterator::<span class="name">operator++</span> ()</h3>
<p>The prefix ++ operator (<tt>++i</tt>) advances the iterator to the next item in the hash and returns an iterator to the new current item.</p>
<p>Calling this function on <a href="qhash.html#end">QHash::end</a>() leads to undefined results.</p>
<p><b>See also </b><a href="qhash-iterator.html#operator--">operator--</a>().</p>
<!-- @@@operator++ -->
<!-- $$$operator++$$$operator++int -->
<h3 class="fn"><a name="operator-2b-2b-2"></a><span class="type">iterator</span> iterator::<span class="name">operator++</span> ( <span class="type">int</span> )</h3>
<p>This is an overloaded function.</p>
<p>The postfix ++ operator (<tt>i++</tt>) advances the iterator to the next item in the hash and returns an iterator to the previously current item.</p>
<!-- @@@operator++ -->
<!-- $$$operator+=[overload1]$$$operator+=int -->
<h3 class="fn"><a name="operator-2b-eq"></a><span class="type">iterator</span> & iterator::<span class="name">operator+=</span> ( <span class="type">int</span> <i>j</i> )</h3>
<p>Advances the iterator by <i>j</i> items. (If <i>j</i> is negative, the iterator goes backward.)</p>
<p><b>See also </b><a href="qhash-iterator.html#operator--eq">operator-=</a>() and <a href="qhash-iterator.html#operator-2b">operator+</a>().</p>
<!-- @@@operator+= -->
<!-- $$$operator-[overload1]$$$operator-int -->
<h3 class="fn"><a name="operator-"></a><span class="type">iterator</span> iterator::<span class="name">operator-</span> ( <span class="type">int</span> <i>j</i> ) const</h3>
<p>Returns an iterator to the item at <i>j</i> positions backward from this iterator. (If <i>j</i> is negative, the iterator goes forward.)</p>
<p>This operation can be slow for large <i>j</i> values.</p>
<p><b>See also </b><a href="qhash-iterator.html#operator-2b">operator+</a>().</p>
<!-- @@@operator- -->
<!-- $$$operator--[overload1]$$$operator-- -->
<h3 class="fn"><a name="operator--"></a><span class="type">iterator</span> & iterator::<span class="name">operator--</span> ()</h3>
<p>The prefix -- operator (<tt>--i</tt>) makes the preceding item current and returns an iterator pointing to the new current item.</p>
<p>Calling this function on <a href="qhash.html#begin">QHash::begin</a>() leads to undefined results.</p>
<p><b>See also </b><a href="qhash-iterator.html#operator-2b-2b">operator++</a>().</p>
<!-- @@@operator-- -->
<!-- $$$operator--$$$operator--int -->
<h3 class="fn"><a name="operator---2"></a><span class="type">iterator</span> iterator::<span class="name">operator--</span> ( <span class="type">int</span> )</h3>
<p>This is an overloaded function.</p>
<p>The postfix -- operator (<tt>i--</tt>) makes the preceding item current and returns an iterator pointing to the previously current item.</p>
<!-- @@@operator-- -->
<!-- $$$operator-=[overload1]$$$operator-=int -->
<h3 class="fn"><a name="operator--eq"></a><span class="type">iterator</span> & iterator::<span class="name">operator-=</span> ( <span class="type">int</span> <i>j</i> )</h3>
<p>Makes the iterator go back by <i>j</i> items. (If <i>j</i> is negative, the iterator goes forward.)</p>
<p><b>See also </b><a href="qhash-iterator.html#operator-2b-eq">operator+=</a>() and <a href="qhash-iterator.html#operator-">operator-</a>().</p>
<!-- @@@operator-= -->
<!-- $$$operator->[overload1]$$$operator-> -->
<h3 class="fn"><a name="operator--gt"></a><span class="type">T</span> * iterator::<span class="name">operator-></span> () const</h3>
<p>Returns a pointer to the current item's value.</p>
<p><b>See also </b><a href="qhash-iterator.html#value">value</a>().</p>
<!-- @@@operator-> -->
<!-- $$$operator==[overload1]$$$operator==constiterator& -->
<h3 class="fn"><a name="operator-eq-eq"></a><span class="type">bool</span> iterator::<span class="name">operator==</span> ( const <span class="type">iterator</span> & <i>other</i> ) const</h3>
<p>Returns true if <i>other</i> points to the same item as this iterator; otherwise returns false.</p>
<p><b>See also </b><a href="qhash-iterator.html#operator-not-eq">operator!=</a>().</p>
<!-- @@@operator== -->
<!-- $$$operator==$$$operator==constconst_iterator& -->
<h3 class="fn"><a name="operator-eq-eq-2"></a><span class="type">bool</span> iterator::<span class="name">operator==</span> ( const <span class="type"><a href="qhash-const-iterator.html">const_iterator</a></span> & <i>other</i> ) const</h3>
<p>Returns true if <i>other</i> points to the same item as this iterator; otherwise returns false.</p>
<p><b>See also </b><a href="qhash-iterator.html#operator-not-eq">operator!=</a>().</p>
<!-- @@@operator== -->
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