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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/doc/qmap.doc:726 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>QMapConstIterator Class</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: #ffffff; color: black; }--></style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr bgcolor="#E5E5E5"><td valign=center> <a href="index.html"><font color="#004faf">Home</font></a> | <a href="classes.html"><font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> | <a href="annotated.html"><font color="#004faf">Annotated</font></a> | <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"><font color="#004faf">Functions</font></a></td><td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QMapConstIterator Class Reference</h1><p>The QMapConstIterator class provides an iterator for QMap.<a href="#details">More...</a><p><tt>#include <<a href="qmap-h.html">qmap.h</a>></tt><p><a href="qmapconstiterator-members.html">List of all member functions.</a><h2>Public Members</h2><ul><li><div class=fn>typedef std::bidirectional_iterator_tag <a href="#iterator_category"><b>iterator_category</b></a></div></li><li><div class=fn>typedef T <a href="#value_type"><b>value_type</b></a></div></li><li><div class=fn>typedef const T * <a href="#pointer"><b>pointer</b></a></div></li><li><div class=fn>typedef const T & <a href="#reference"><b>reference</b></a></div></li><li><div class=fn><a href="#QMapConstIterator"><b>QMapConstIterator</b></a> ()</div></li><li><div class=fn><a href="#QMapConstIterator-2"><b>QMapConstIterator</b></a> ( QMapNode<K, T> * p )</div></li><li><div class=fn><a href="#QMapConstIterator-3"><b>QMapConstIterator</b></a> ( const QMapConstIterator<K, T> & it )</div></li><li><div class=fn><a href="#QMapConstIterator-4"><b>QMapConstIterator</b></a> ( const QMapIterator<K, T> & it )</div></li><li><div class=fn>bool <a href="#operator-eq-eq"><b>operator==</b></a> ( const QMapConstIterator<K, T> & it ) const</div></li><li><div class=fn>bool <a href="#operator!-eq"><b>operator!=</b></a> ( const QMapConstIterator<K, T> & it ) const</div></li><li><div class=fn>const T & <a href="#operator*"><b>operator*</b></a> () const</div></li><li><div class=fn>const K & <a href="#key"><b>key</b></a> () const</div></li><li><div class=fn>const T & <a href="#data"><b>data</b></a> () const</div></li><li><div class=fn>QMapConstIterator<K, T> & <a href="#operator++"><b>operator++</b></a> ()</div></li><li><div class=fn>QMapConstIterator<K, T> <a href="#operator++-2"><b>operator++</b></a> ( int )</div></li><li><div class=fn>QMapConstIterator<K, T> & <a href="#operator--"><b>operator--</b></a> ()</div></li><li><div class=fn>QMapConstIterator<K, T> <a href="#operator---2"><b>operator--</b></a> ( int )</div></li></ul><hr><a name="details"></a><h2>Detailed Description</h2>The QMapConstIterator class provides an iterator for <a href="qmap.html">QMap</a>.<p> <p> In contrast to <a href="qmapiterator.html">QMapIterator</a>, this class is used to iterate over aconst map. It does not allow you to modify the values of the mapbecause this would break the const semantics.<p> For more information on QMap iterators, see <a href="qmapiterator.html">QMapIterator</a>.and the <a href="qmap.html#qmap-eg">QMap example</a>.<p> <p>See also <a href="qmap.html">QMap</a>, <a href="qmapiterator.html">QMapIterator</a>, <a href="qtl.html">Qt Template Library Classes</a> and <a href="tools.html">Non-GUI Classes</a>.<hr><h2>Member Type Documentation</h2><h3 class=fn><a name="iterator_category"></a>QMapConstIterator::iterator_category</h3> The type of iterator category, <tt>std::bidirectional_iterator_tag</tt>. <h3 class=fn><a name="pointer"></a>QMapConstIterator::pointer</h3> Const pointer to value_type. <h3 class=fn><a name="reference"></a>QMapConstIterator::reference</h3> Const reference to value_type. <h3 class=fn><a name="value_type"></a>QMapConstIterator::value_type</h3> The type of const value. <hr><h2>Member Function Documentation</h2><h3 class=fn><a name="QMapConstIterator"></a>QMapConstIterator::QMapConstIterator ()</h3>Constructs an uninitialized iterator.<h3 class=fn><a name="QMapConstIterator-2"></a>QMapConstIterator::QMapConstIterator ( QMapNode<K, T> * p )</h3>Constructs an iterator starting at node <em>p</em>.<h3 class=fn><a name="QMapConstIterator-3"></a>QMapConstIterator::QMapConstIterator ( const <a href="qmapconstiterator.html">QMapConstIterator</a><K, T> & it )</h3>Constructs a copy of the iterator, <em>it</em>.<h3 class=fn><a name="QMapConstIterator-4"></a>QMapConstIterator::QMapConstIterator ( const <a href="qmapiterator.html">QMapIterator</a><K, T> & it )</h3>Constructs a copy of the iterator, <em>it</em>.<h3 class=fn>const T & <a name="data"></a>QMapConstIterator::data () const</h3>Returns a const reference to the data of the current item.<h3 class=fn>const K & <a name="key"></a>QMapConstIterator::key () const</h3>Returns a const reference to the current key.<h3 class=fn>bool <a name="operator!-eq"></a>QMapConstIterator::operator!= ( const <a href="qmapconstiterator.html">QMapConstIterator</a><K, T> & it ) const</h3><p> Compares the iterator to the <em>it</em> iterator and returns FALSE if theypoint to the same item; otherwise returns TRUE.<h3 class=fn>const T & <a name="operator*"></a>QMapConstIterator::operator* () const</h3><p> Dereference operator. Returns a const reference to the current item.The same as <a href="#data">data</a>().<h3 class=fn><a href="qmapconstiterator.html">QMapConstIterator</a><K, T> & <a name="operator++"></a>QMapConstIterator::operator++ ()</h3><p> Prefix ++ makes the succeeding item current and returns an iteratorpointing to the new current item. The iterator cannot checkwhether it reached the end of the map. Incrementing the iterator returned by end() causes undefined results.<h3 class=fn><a href="qmapconstiterator.html">QMapConstIterator</a><K, T> <a name="operator++-2"></a>QMapConstIterator::operator++ ( int )</h3><p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.<p> Postfix ++ makes the succeeding item current and returns an iteratorpointing to the new current item. The iterator cannot checkwhether it reached the end of the map. Incrementing the iterator returned by end() causes undefined results.<h3 class=fn><a href="qmapconstiterator.html">QMapConstIterator</a><K, T> & <a name="operator--"></a>QMapConstIterator::operator-- ()</h3><p> Prefix -- makes the previous item current and returns an iteratorpointing to the new current item. The iterator cannot checkwhether it reached the beginning of the map. Decrementing theiterator returned by begin() causes undefined results.<h3 class=fn><a href="qmapconstiterator.html">QMapConstIterator</a><K, T> <a name="operator---2"></a>QMapConstIterator::operator-- ( int )</h3><p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.<p> Postfix -- makes the previous item current and returns an iteratorpointing to the new current item. The iterator cannot checkwhether it reached the beginning of the map. Decrementing theiterator returned by begin() causes undefined results.<h3 class=fn>bool <a name="operator-eq-eq"></a>QMapConstIterator::operator== ( const <a href="qmapconstiterator.html">QMapConstIterator</a><K, T> & it ) const</h3><p> Compares the iterator to the <em>it</em> iterator and returns TRUE if theypoint to the same item; otherwise returns FALSE.<!-- eof --><hr><p>This file is part of the <a href="index.html">Qt toolkit</a>.Copyright © 1995-2002<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center><table width=100% cellspacing=0 border=0><tr><td>Copyright © 2002 <a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a><td align=right><div align=right>Qt version 3.0.5</div></table></div></address></body></html>⌨️ 快捷键说明
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