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208 lines
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208 lines
10 KiB
13 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/qvaluelist.doc:834 -->
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>TQValueListIterator Class</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQValueListIterator Class Reference</h1>
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<p>The TQValueListIterator class provides an iterator for TQValueList.
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<a href="#details">More...</a>
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<p>All the functions in this class are <a href="threads.html#reentrant">reentrant</a> when TQt is built with thread support.</p>
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<p><tt>#include <<a href="qvaluelist-h.html">qvaluelist.h</a>></tt>
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<p><a href="qvaluelistiterator-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn>typedef T <a href="#value_type"><b>value_type</b></a></li>
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<li class=fn>typedef T * <a href="#pointer"><b>pointer</b></a></li>
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<li class=fn>typedef T & <a href="#reference"><b>reference</b></a></li>
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<li class=fn><a href="#TQValueListIterator"><b>TQValueListIterator</b></a> ()</li>
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<li class=fn><a href="#TQValueListIterator-3"><b>TQValueListIterator</b></a> ( const TQValueListIterator<T> & it )</li>
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<li class=fn>bool <a href="#operator-eq-eq"><b>operator==</b></a> ( const TQValueListIterator<T> & it ) const</li>
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<li class=fn>bool <a href="#operator!-eq"><b>operator!=</b></a> ( const TQValueListIterator<T> & it ) const</li>
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<li class=fn>const T & <a href="#operator*-2"><b>operator*</b></a> () const</li>
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<li class=fn>T & <a href="#operator*"><b>operator*</b></a> ()</li>
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<li class=fn>TQValueListIterator<T> & <a href="#operator++"><b>operator++</b></a> ()</li>
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<li class=fn>TQValueListIterator<T> <a href="#operator++-2"><b>operator++</b></a> ( int )</li>
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<li class=fn>TQValueListIterator<T> & <a href="#operator--"><b>operator--</b></a> ()</li>
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<li class=fn>TQValueListIterator<T> <a href="#operator---2"><b>operator--</b></a> ( int )</li>
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<li class=fn>TQValueListIterator<T> & <a href="#operator+-eq"><b>operator+=</b></a> ( int j )</li>
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<li class=fn>TQValueListIterator<T> & <a href="#operator--eq"><b>operator-=</b></a> ( int j )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQValueListIterator class provides an iterator for <a href="qvaluelist.html">TQValueList</a>.
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<p>
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<p> An iterator is a class for accessing the items of a container
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class: a generalization of the index in an array. A pointer
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into a "const char *" and an index into an "int[]" are both
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iterators, and the general idea is to provide that functionality
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for any data structure.
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<p> The TQValueListIterator class is an iterator for TQValueList
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instantiations. You can create the appropriate iterator type by
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using the <tt>iterator</tt> typedef provided by TQValueList.
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<p> The only way to access the items in a TQValueList is to use an
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iterator.
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<p> Example (see TQValueList for the complete code):
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<pre>
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EmployeeList::iterator it;
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for ( it = list.begin(); it != list.end(); ++it )
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cout << (*it).surname().latin1() << ", " <<
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(*it).forename().latin1() << " earns " <<
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(*it).salary() << endl;
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// Output:
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// Doe, John earns 50000
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// Williams, Jane earns 80000
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// Hawthorne, Mary earns 90000
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// Jones, Tom earns 60000
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</pre>
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<p> <a href="qvaluelist.html">TQValueList</a> is highly optimized for performance and memory usage.
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This means that you must be careful: TQValueList does not know
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about all its iterators and the iterators don't know to which list
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they belong. This makes things very fast, but if you're not
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careful, you can get spectacular bugs. Always make sure iterators
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are valid before dereferencing them or using them as parameters to
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generic algorithms in the STL or the <a href="qtl.html">TQTL</a>.
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<p> Using an invalid iterator is undefined (your application will
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probably crash). Many TQt functions return const value lists; to
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iterate over these you should make a copy and iterate over the
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copy.
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<p> For every Iterator there is a ConstIterator. When accessing a
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TQValueList in a const environment or if the reference or pointer
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to the list is itself const, then you must use the ConstIterator.
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Its semantics are the same as the Iterator, but it only returns
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const references.
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<p> <p>See also <a href="qvaluelist.html">TQValueList</a>, <a href="qvaluelistconstiterator.html">TQValueListConstIterator</a>, <a href="qtl.html">TQt Template Library Classes</a>, and <a href="tools.html">Non-GUI Classes</a>.
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<hr><h2>Member Type Documentation</h2>
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<h3 class=fn><a name="pointer"></a>TQValueListIterator::pointer</h3>
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Pointer to value_type.
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<h3 class=fn><a name="reference"></a>TQValueListIterator::reference</h3>
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Reference to value_type.
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<h3 class=fn><a name="value_type"></a>TQValueListIterator::value_type</h3>
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The type of value, T.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQValueListIterator"></a>TQValueListIterator::TQValueListIterator ()
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</h3>
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<p> Creates un uninitialized iterator.
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<h3 class=fn><a name="TQValueListIterator-3"></a>TQValueListIterator::TQValueListIterator ( const <a href="qvaluelistiterator.html">TQValueListIterator</a><T> & it )
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</h3>
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<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Constructs a copy of the iterator <em>it</em>.
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<h3 class=fn>bool <a name="operator!-eq"></a>TQValueListIterator::operator!= ( const <a href="qvaluelistiterator.html">TQValueListIterator</a><T> & it ) const
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</h3>
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<p> Compares this iterator and <em>it</em> and returns TRUE if they point to
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different items; otherwise returns FALSE.
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<h3 class=fn>T & <a name="operator*"></a>TQValueListIterator::operator* ()
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</h3>
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<p> Asterisk operator. Returns a reference to the current iterator item.
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<h3 class=fn>const T & <a name="operator*-2"></a>TQValueListIterator::operator* () const
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</h3>
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<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Asterisk operator. Returns a reference to the current iterator item.
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<h3 class=fn><a href="qvaluelistiterator.html">TQValueListIterator</a><T> & <a name="operator++"></a>TQValueListIterator::operator++ ()
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</h3>
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<p> Prefix ++ makes the succeeding item current and returns an
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iterator pointing to the new current item. The iterator cannot
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check whether it reached the end of the list. Incrementing the
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iterator returned by end() causes undefined results.
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<h3 class=fn><a href="qvaluelistiterator.html">TQValueListIterator</a><T> <a name="operator++-2"></a>TQValueListIterator::operator++ ( int )
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</h3>
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<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Postfix ++ makes the succeeding item current and returns an
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iterator pointing to the new current item. The iterator cannot
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check whether it reached the end of the list. Incrementing the
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iterator returned by end() causes undefined results.
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<h3 class=fn><a href="qvaluelistiterator.html">TQValueListIterator</a><T> & <a name="operator+-eq"></a>TQValueListIterator::operator+= ( int j )
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</h3>
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<p> Postfix -- jumps <em>j</em> steps forward in the list. The iterator
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cannot check whether it reached the end of the list. Jumping past
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the end() causes undefined results.
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<h3 class=fn><a href="qvaluelistiterator.html">TQValueListIterator</a><T> & <a name="operator--"></a>TQValueListIterator::operator-- ()
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</h3>
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<p> Prefix -- makes the previous item current and returns an iterator
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pointing to the new current item. The iterator cannot check
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whether it reached the beginning of the list. Decrementing the
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iterator returned by begin() causes undefined results.
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<h3 class=fn><a href="qvaluelistiterator.html">TQValueListIterator</a><T> <a name="operator---2"></a>TQValueListIterator::operator-- ( int )
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</h3>
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<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Postfix -- makes the previous item current and returns an iterator
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pointing to the new current item. The iterator cannot check
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whether it reached the beginning of the list. Decrementing the
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iterator returned by begin() causes undefined results.
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<h3 class=fn><a href="qvaluelistiterator.html">TQValueListIterator</a><T> & <a name="operator--eq"></a>TQValueListIterator::operator-= ( int j )
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</h3>
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<p> Postfix -- jumps <em>j</em> steps backward in the list. The iterator
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cannot check whether it reached the beginning of the list. Jumping
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past begin() causes undefined results.
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<h3 class=fn>bool <a name="operator-eq-eq"></a>TQValueListIterator::operator== ( const <a href="qvaluelistiterator.html">TQValueListIterator</a><T> & it ) const
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</h3>
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<p> Compares this iterator and <em>it</em> and returns TRUE if they point to
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the same item; otherwise returns FALSE.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">TQt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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</table></div></address></body>
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</html>
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