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<li class="level1"><a href="#public-types">Public Types</a></li>
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<h1 class="title">const_iterator Class Reference</h1>
<span class="small-subtitle">(QList::const_iterator)<br/></span>
<!-- $$$const_iterator-brief -->
<p>The QList::const_iterator class provides an STL-style const iterator for <a href="qlist.html">QList</a> and <a href="qqueue.html">QQueue</a>. <a href="#details">More...</a></p>
<!-- @@@const_iterator -->
<pre class="cpp"> <span class="preprocessor">#include <<a href="qlist.html">QList</a>></span></pre><ul>
<li><a href="qlist-const-iterator-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="public-types"></a>
<h2>Public Types</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> typedef </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#iterator_category-typedef">iterator_category</a></b></td></tr>
</table>
<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="qlist-const-iterator.html#const_iterator">const_iterator</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#const_iterator-3">const_iterator</a></b> ( const const_iterator & <i>other</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#const_iterator-4">const_iterator</a></b> ( const iterator & <i>other</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#operator-not-eq">operator!=</a></b> ( const const_iterator & <i>other</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const T & </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#operator-2a">operator*</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const_iterator </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#operator-2b">operator+</a></b> ( int <i>j</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const_iterator & </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#operator-2b-2b">operator++</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const_iterator </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#operator-2b-2b-2">operator++</a></b> ( int )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const_iterator & </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#operator-2b-eq">operator+=</a></b> ( int <i>j</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const_iterator </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#operator-">operator-</a></b> ( int <i>j</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#operator--2">operator-</a></b> ( const_iterator <i>other</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const_iterator & </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#operator--">operator--</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const_iterator </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#operator---2">operator--</a></b> ( int )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const_iterator & </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#operator--eq">operator-=</a></b> ( int <i>j</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const T * </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-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="qlist-const-iterator.html#operator-lt">operator<</a></b> ( const const_iterator & <i>other</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#operator-lt-eq">operator<=</a></b> ( const const_iterator & <i>other</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#operator-eq-eq">operator==</a></b> ( const const_iterator & <i>other</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#operator-gt">operator></a></b> ( const const_iterator & <i>other</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#operator-gt-eq">operator>=</a></b> ( const const_iterator & <i>other</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const T & </td><td class="memItemRight bottomAlign"><b><a href="qlist-const-iterator.html#operator-5b-5d">operator[]</a></b> ( int <i>j</i> ) const</td></tr>
</table>
<a name="details"></a>
<!-- $$$const_iterator-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The QList::const_iterator class provides an STL-style const iterator for <a href="qlist.html">QList</a> and <a href="qqueue.html">QQueue</a>.</p>
<p><a href="qlist.html">QList</a> provides 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="qlist.html">QList</a><T>::const_iterator allows you to iterate over a <a href="qlist.html">QList</a><T> (or a <a href="qqueue.html">QQueue</a><T>). If you want to modify the <a href="qlist.html">QList</a> as you iterate over it, use <a href="qlist-iterator.html">QList::iterator</a> instead. It is generally good practice to use QList::const_iterator on a non-const <a href="qlist.html">QList</a> as well, unless you need to change the <a href="qlist.html">QList</a> through the iterator. Const iterators are slightly faster, and can improve code readability.</p>
<p>The default QList::const_iterator constructor creates an uninitialized iterator. You must initialize it using a <a href="qlist.html">QList</a> function like <a href="qlist.html#constBegin">QList::constBegin</a>(), <a href="qlist.html#constEnd">QList::constEnd</a>(), or <a href="qlist.html#insert">QList::insert</a>() before you can start iterating. Here's a typical loop that prints all the items stored in a list:</p>
<pre class="cpp"> <span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qstring.html">QString</a></span><span class="operator">></span> list;
list<span class="operator">.</span><a href="qlist.html#append">append</a>(<span class="string">"January"</span>);
list<span class="operator">.</span><a href="qlist.html#append">append</a>(<span class="string">"February"</span>);
<span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>
list<span class="operator">.</span><a href="qlist.html#append">append</a>(<span class="string">"December"</span>);
<span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qstring.html">QString</a></span><span class="operator">></span><span class="operator">::</span>const_iterator i;
<span class="keyword">for</span> (i <span class="operator">=</span> list<span class="operator">.</span>constBegin(); i <span class="operator">!</span><span class="operator">=</span> list<span class="operator">.</span>constEnd(); <span class="operator">+</span><span class="operator">+</span>i)
cout <span class="operator"><</span><span class="operator"><</span> <span class="operator">*</span>i <span class="operator"><</span><span class="operator"><</span> endl;</pre>
<p>Most <a href="qlist.html">QList</a> functions accept an integer index rather than an iterator. For that reason, iterators are rarely useful in connection with <a href="qlist.html">QList</a>. One place where STL-style iterators do make sense is as arguments to <a href="qtalgorithms.html">generic algorithms</a>.</p>
<p>For example, here's how to delete all the widgets stored in a <a href="qlist.html">QList</a><<a href="qwidget.html">QWidget</a> *>:</p>
<pre class="cpp"> <span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span><span class="operator">></span> list;
<span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>
<a href="qtalgorithms.html#qDeleteAll">qDeleteAll</a>(list<span class="operator">.</span>constBegin()<span class="operator">,</span> list<span class="operator">.</span>constEnd());</pre>
<p>Multiple iterators can be used on the same list. However, be aware that any non-const function call performed on the <a href="qlist.html">QList</a> will render all existing iterators undefined. If you need to keep iterators over a long period of time, we recommend that you use <a href="qlinkedlist.html">QLinkedList</a> rather than <a href="qlist.html">QList</a>.</p>
</div>
<p><b>See also </b><a href="qlist-iterator.html">QList::iterator</a> and <a href="qlistiterator.html">QListIterator</a>.</p>
<!-- @@@const_iterator -->
<div class="types">
<h2>Member Type Documentation</h2>
<!-- $$$iterator_category -->
<h3 class="fn"><a name="iterator_category-typedef"></a>typedef const_iterator::<span class="name">iterator_category</span></h3>
<p>A synonym for <i>std::random_access_iterator_tag</i> indicating this iterator is a random access iterator.</p>
<!-- @@@iterator_category -->
</div>
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$const_iterator[overload1]$$$const_iterator -->
<h3 class="fn"><a name="const_iterator"></a>const_iterator::<span class="name">const_iterator</span> ()</h3>
<p>Constructs an uninitialized iterator.</p>
<p>Functions like operator*() and operator++() should not be called on an uninitialized iterator. Use operator=() to assign a value to it before using it.</p>
<p><b>See also </b><a href="qlist.html#constBegin">QList::constBegin</a>() and <a href="qlist.html#constEnd">QList::constEnd</a>().</p>
<!-- @@@const_iterator -->
<!-- $$$const_iterator$$$const_iteratorconstconst_iterator& -->
<h3 class="fn"><a name="const_iterator-3"></a>const_iterator::<span class="name">const_iterator</span> ( const <span class="type">const_iterator</span> & <i>other</i> )</h3>
<p>Constructs a copy of <i>other</i>.</p>
<!-- @@@const_iterator -->
<!-- $$$const_iterator$$$const_iteratorconstiterator& -->
<h3 class="fn"><a name="const_iterator-4"></a>const_iterator::<span class="name">const_iterator</span> ( const <span class="type"><a href="qlist-iterator.html">iterator</a></span> & <i>other</i> )</h3>
<p>Constructs a copy of <i>other</i>.</p>
<!-- @@@const_iterator -->
<!-- $$$operator!=[overload1]$$$operator!=constconst_iterator& -->
<h3 class="fn"><a name="operator-not-eq"></a><span class="type">bool</span> const_iterator::<span class="name">operator!=</span> ( const <span class="type">const_iterator</span> & <i>other</i> ) const</h3>
<p>Returns true if <i>other</i> points to a different item than this iterator; otherwise returns false.</p>
<p><b>See also </b><a href="qlist-const-iterator.html#operator-eq-eq">operator==</a>().</p>
<!-- @@@operator!= -->
<!-- $$$operator*[overload1]$$$operator* -->
<h3 class="fn"><a name="operator-2a"></a>const <span class="type">T</span> & const_iterator::<span class="name">operator*</span> () const</h3>
<p>Returns the current item.</p>
<p><b>See also </b><a href="qlist-const-iterator.html#operator--gt">operator-></a>().</p>
<!-- @@@operator* -->
<!-- $$$operator+[overload1]$$$operator+int -->
<h3 class="fn"><a name="operator-2b"></a><span class="type">const_iterator</span> const_iterator::<span class="name">operator+</span> ( <span class="type">int</span> <i>j</i> ) const</h3>
<p>Returns an iterator to the item at <i>j</i> positions forward from this iterator. (If <i>j</i> is negative, the iterator goes backward.)</p>
<p><b>See also </b><a href="qlist-const-iterator.html#operator-">operator-</a>() and <a href="qlist-const-iterator.html#operator-2b-eq">operator+=</a>().</p>
<!-- @@@operator+ -->
<!-- $$$operator++[overload1]$$$operator++ -->
<h3 class="fn"><a name="operator-2b-2b"></a><span class="type">const_iterator</span> & const_iterator::<span class="name">operator++</span> ()</h3>
<p>The prefix ++ operator (<tt>++it</tt>) advances the iterator to the next item in the list and returns an iterator to the new current item.</p>
<p>Calling this function on <a href="qlist.html#end">QList::end</a>() leads to undefined results.</p>
<p><b>See also </b><a href="qlist-const-iterator.html#operator--">operator--</a>().</p>
<!-- @@@operator++ -->
<!-- $$$operator++$$$operator++int -->
<h3 class="fn"><a name="operator-2b-2b-2"></a><span class="type">const_iterator</span> const_iterator::<span class="name">operator++</span> ( <span class="type">int</span> )</h3>
<p>This is an overloaded function.</p>
<p>The postfix ++ operator (<tt>it++</tt>) advances the iterator to the next item in the list and returns an iterator to the previously current item.</p>
<!-- @@@operator++ -->
<!-- $$$operator+=[overload1]$$$operator+=int -->
<h3 class="fn"><a name="operator-2b-eq"></a><span class="type">const_iterator</span> & const_iterator::<span class="name">operator+=</span> ( <span class="type">int</span> <i>j</i> )</h3>
<p>Advances the iterator by <i>j</i> items. (If <i>j</i> is negative, the iterator goes backward.)</p>
<p><b>See also </b><a href="qlist-const-iterator.html#operator--eq">operator-=</a>() and <a href="qlist-const-iterator.html#operator-2b">operator+</a>().</p>
<!-- @@@operator+= -->
<!-- $$$operator-[overload1]$$$operator-int -->
<h3 class="fn"><a name="operator-"></a><span class="type">const_iterator</span> const_iterator::<span class="name">operator-</span> ( <span class="type">int</span> <i>j</i> ) const</h3>
<p>Returns an iterator to the item at <i>j</i> positions backward from this iterator. (If <i>j</i> is negative, the iterator goes forward.)</p>
<p><b>See also </b><a href="qlist-const-iterator.html#operator-2b">operator+</a>() and <a href="qlist-const-iterator.html#operator--eq">operator-=</a>().</p>
<!-- @@@operator- -->
<!-- $$$operator-$$$operator-const_iterator -->
<h3 class="fn"><a name="operator--2"></a><span class="type">int</span> const_iterator::<span class="name">operator-</span> ( <span class="type">const_iterator</span> <i>other</i> ) const</h3>
<p>Returns the number of items between the item pointed to by <i>other</i> and the item pointed to by this iterator.</p>
<!-- @@@operator- -->
<!-- $$$operator--[overload1]$$$operator-- -->
<h3 class="fn"><a name="operator--"></a><span class="type">const_iterator</span> & const_iterator::<span class="name">operator--</span> ()</h3>
<p>The prefix -- operator (<tt>--it</tt>) makes the preceding item current and returns an iterator to the new current item.</p>
<p>Calling this function on <a href="qlist.html#begin">QList::begin</a>() leads to undefined results.</p>
<p><b>See also </b><a href="qlist-const-iterator.html#operator-2b-2b">operator++</a>().</p>
<!-- @@@operator-- -->
<!-- $$$operator--$$$operator--int -->
<h3 class="fn"><a name="operator---2"></a><span class="type">const_iterator</span> const_iterator::<span class="name">operator--</span> ( <span class="type">int</span> )</h3>
<p>This is an overloaded function.</p>
<p>The postfix -- operator (<tt>it--</tt>) makes the preceding item current and returns an iterator to the previously current item.</p>
<!-- @@@operator-- -->
<!-- $$$operator-=[overload1]$$$operator-=int -->
<h3 class="fn"><a name="operator--eq"></a><span class="type">const_iterator</span> & const_iterator::<span class="name">operator-=</span> ( <span class="type">int</span> <i>j</i> )</h3>
<p>Makes the iterator go back by <i>j</i> items. (If <i>j</i> is negative, the iterator goes forward.)</p>
<p><b>See also </b><a href="qlist-const-iterator.html#operator-2b-eq">operator+=</a>() and <a href="qlist-const-iterator.html#operator-">operator-</a>().</p>
<!-- @@@operator-= -->
<!-- $$$operator->[overload1]$$$operator-> -->
<h3 class="fn"><a name="operator--gt"></a>const <span class="type">T</span> * const_iterator::<span class="name">operator-></span> () const</h3>
<p>Returns a pointer to the current item.</p>
<p><b>See also </b><a href="qlist-const-iterator.html#operator-2a">operator*</a>().</p>
<!-- @@@operator-> -->
<!-- $$$operator<[overload1]$$$operator<constconst_iterator& -->
<h3 class="fn"><a name="operator-lt"></a><span class="type">bool</span> const_iterator::<span class="name">operator<</span> ( const <span class="type">const_iterator</span> & <i>other</i> ) const</h3>
<p>Returns true if the item pointed to by this iterator is less than the item pointed to by the <i>other</i> iterator.</p>
<!-- @@@operator< -->
<!-- $$$operator<=[overload1]$$$operator<=constconst_iterator& -->
<h3 class="fn"><a name="operator-lt-eq"></a><span class="type">bool</span> const_iterator::<span class="name">operator<=</span> ( const <span class="type">const_iterator</span> & <i>other</i> ) const</h3>
<p>Returns true if the item pointed to by this iterator is less than or equal to the item pointed to by the <i>other</i> iterator.</p>
<!-- @@@operator<= -->
<!-- $$$operator==[overload1]$$$operator==constconst_iterator& -->
<h3 class="fn"><a name="operator-eq-eq"></a><span class="type">bool</span> const_iterator::<span class="name">operator==</span> ( const <span class="type">const_iterator</span> & <i>other</i> ) const</h3>
<p>Returns true if <i>other</i> points to the same item as this iterator; otherwise returns false.</p>
<p><b>See also </b><a href="qlist-const-iterator.html#operator-not-eq">operator!=</a>().</p>
<!-- @@@operator== -->
<!-- $$$operator>[overload1]$$$operator>constconst_iterator& -->
<h3 class="fn"><a name="operator-gt"></a><span class="type">bool</span> const_iterator::<span class="name">operator></span> ( const <span class="type">const_iterator</span> & <i>other</i> ) const</h3>
<p>Returns true if the item pointed to by this iterator is greater than the item pointed to by the <i>other</i> iterator.</p>
<!-- @@@operator> -->
<!-- $$$operator>=[overload1]$$$operator>=constconst_iterator& -->
<h3 class="fn"><a name="operator-gt-eq"></a><span class="type">bool</span> const_iterator::<span class="name">operator>=</span> ( const <span class="type">const_iterator</span> & <i>other</i> ) const</h3>
<p>Returns true if the item pointed to by this iterator is greater than or equal to the item pointed to by the <i>other</i> iterator.</p>
<!-- @@@operator>= -->
<!-- $$$operator[][overload1]$$$operator[]int -->
<h3 class="fn"><a name="operator-5b-5d"></a>const <span class="type">T</span> & const_iterator::<span class="name">operator[]</span> ( <span class="type">int</span> <i>j</i> ) const</h3>
<p>Returns the item at position *this + <i>j</i>.</p>
<p>This function is provided to make <a href="qlist.html">QList</a> iterators behave like C++ pointers.</p>
<p><b>See also </b><a href="qlist-const-iterator.html#operator-2b">operator+</a>().</p>
<!-- @@@operator[] -->
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