diff options
Diffstat (limited to 'doc/html/tqptrlistiterator.html')
| -rw-r--r-- | doc/html/tqptrlistiterator.html | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/doc/html/tqptrlistiterator.html b/doc/html/tqptrlistiterator.html new file mode 100644 index 000000000..555aa4d88 --- /dev/null +++ b/doc/html/tqptrlistiterator.html @@ -0,0 +1,234 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/tqptrlist.doc:840 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>TQPtrListIterator Class</title> +<style type="text/css"><!-- +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>TQPtrListIterator Class Reference</h1> + +<p>The TQPtrListIterator class provides an iterator for +TQPtrList collections. +<a href="#details">More...</a> +<p><tt>#include <<a href="tqptrlist-h.html">tqptrlist.h</a>></tt> +<p>Inherited by <a href="tqobjectlistiterator.html">TQObjectListIterator</a> and <a href="qstrlistiterator.html">TQStrListIterator</a>. +<p><a href="tqptrlistiterator-members.html">List of all member functions.</a> +<h2>Public Members</h2> +<ul> +<li class=fn><a href="#TQPtrListIterator"><b>TQPtrListIterator</b></a> ( const TQPtrList<type> & list )</li> +<li class=fn><a href="#~TQPtrListIterator"><b>~TQPtrListIterator</b></a> ()</li> +<li class=fn>uint <a href="#count"><b>count</b></a> () const</li> +<li class=fn>bool <a href="#isEmpty"><b>isEmpty</b></a> () const</li> +<li class=fn>bool <a href="#atFirst"><b>atFirst</b></a> () const</li> +<li class=fn>bool <a href="#atLast"><b>atLast</b></a> () const</li> +<li class=fn>type * <a href="#toFirst"><b>toFirst</b></a> ()</li> +<li class=fn>type * <a href="#toLast"><b>toLast</b></a> ()</li> +<li class=fn><a href="#operator-type-*"><b>operator type *</b></a> () const</li> +<li class=fn>type * <a href="#operator*"><b>operator*</b></a> ()</li> +<li class=fn>type * <a href="#current"><b>current</b></a> () const</li> +<li class=fn>type * <a href="#operator()"><b>operator()</b></a> ()</li> +<li class=fn>type * <a href="#operator++"><b>operator++</b></a> ()</li> +<li class=fn>type * <a href="#operator+-eq"><b>operator+=</b></a> ( uint jump )</li> +<li class=fn>type * <a href="#operator--"><b>operator--</b></a> ()</li> +<li class=fn>type * <a href="#operator--eq"><b>operator-=</b></a> ( uint jump )</li> +<li class=fn>TQPtrListIterator<type> & <a href="#operator-eq"><b>operator=</b></a> ( const TQPtrListIterator<type> & it )</li> +</ul> +<hr><a name="details"></a><h2>Detailed Description</h2> + + +The TQPtrListIterator class provides an iterator for +<a href="tqptrlist.html">TQPtrList</a> collections. +<p> + +<p> Define a template instance TQPtrListIterator<X> to create a list +iterator that operates on TQPtrList<X> (list of X*). +<p> The following example is similar to the <a href="tqptrlist.html#example">example in the TQPtrList class documentation</a>, but it uses TQPtrListIterator. The class Employee is +defined there. +<p> <pre> + <a href="tqptrlist.html">TQPtrList</a><Employee> list; + + list.<a href="tqptrlist.html#append">append</a>( new Employee("John", "Doe", 50000) ); + list.<a href="tqptrlist.html#append">append</a>( new Employee("Jane", "Williams", 80000) ); + list.<a href="tqptrlist.html#append">append</a>( new Employee("Tom", "Jones", 60000) ); + + TQPtrListIterator<Employee> it( list ); + Employee *employee; + while ( (employee = it.<a href="#current">current</a>()) != 0 ) { + ++it; + cout << employee->surname().latin1() << ", " << + employee->forename().latin1() << " earns " << + employee->salary() << endl; + } + </pre> + +<p> The output is +<pre> + Doe, John earns 50000 + Williams, Jane earns 80000 + Jones, Tom earns 60000 + </pre> + +<p> Using a list iterator is a more robust way of traversing the list +than using the <a href="tqptrlist.html">TQPtrList</a> member functions <a href="tqptrlist.html#first">first</a>(), <a href="tqptrlist.html#next">next</a>(), <a href="tqptrlist.html#current">current</a>(), etc., as many iterators can +traverse the same list independently. +<p> An iterator has its own current list item and can get the next and +previous list items. It doesn't modify the list in any way. +<p> When an item is removed from the list, all iterators that point to +that item are updated to point to <a href="tqptrlist.html#current">TQPtrList::current</a>() instead to +avoid dangling references. +<p> <p>See also <a href="tqptrlist.html">TQPtrList</a>, <a href="collection.html">Collection Classes</a>, and <a href="tools.html">Non-GUI Classes</a>. + +<hr><h2>Member Function Documentation</h2> +<h3 class=fn><a name="TQPtrListIterator"></a>TQPtrListIterator::TQPtrListIterator ( const <a href="tqptrlist.html">TQPtrList</a><type> & list ) +</h3> + +<p> Constructs an iterator for <em>list</em>. The current iterator item is +set to point on the first item in the <em>list</em>. + +<h3 class=fn><a name="~TQPtrListIterator"></a>TQPtrListIterator::~TQPtrListIterator () +</h3> + +<p> Destroys the iterator. + +<h3 class=fn>bool <a name="atFirst"></a>TQPtrListIterator::atFirst () const +</h3> + +<p> Returns TRUE if the current iterator item is the first list item; +otherwise returns FALSE. +<p> <p>See also <a href="#toFirst">toFirst</a>() and <a href="#atLast">atLast</a>(). + +<h3 class=fn>bool <a name="atLast"></a>TQPtrListIterator::atLast () const +</h3> + +<p> Returns TRUE if the current iterator item is the last list item; +otherwise returns FALSE. +<p> <p>See also <a href="#toLast">toLast</a>() and <a href="#atFirst">atFirst</a>(). + +<h3 class=fn>uint <a name="count"></a>TQPtrListIterator::count () const +</h3> + +<p> Returns the number of items in the list this iterator operates on. +<p> <p>See also <a href="#isEmpty">isEmpty</a>(). + +<p>Example: <a href="customlayout-example.html#x1522">customlayout/card.cpp</a>. +<h3 class=fn>type * <a name="current"></a>TQPtrListIterator::current () const +</h3> + +<p> Returns a pointer to the current iterator item. If the iterator is +positioned before the first item in the list or after the last +item in the list, 0 is returned. + +<p>Examples: <a href="canvas-example.html#x2949">canvas/canvas.cpp</a>, <a href="customlayout-example.html#x1523">customlayout/card.cpp</a>, and <a href="customlayout-example.html#x1481">customlayout/flow.cpp</a>. +<h3 class=fn>bool <a name="isEmpty"></a>TQPtrListIterator::isEmpty () const +</h3> + +<p> Returns TRUE if the list is empty; otherwise returns FALSE. +<p> <p>See also <a href="#count">count</a>(). + +<h3 class=fn><a name="operator-type-*"></a>TQPtrListIterator::operator type * () const +</h3> + +<p> Cast operator. Returns a pointer to the current iterator item. +Same as <a href="#current">current</a>(). + +<h3 class=fn>type * <a name="operator()"></a>TQPtrListIterator::operator() () +</h3> + +<p> Makes the succeeding item current and returns the original current +item. +<p> If the current iterator item was the last item in the list or if +it was 0, 0 is returned. + +<h3 class=fn>type * <a name="operator*"></a>TQPtrListIterator::operator* () +</h3> + +<p> Asterisk operator. Returns a pointer to the current iterator item. +Same as <a href="#current">current</a>(). + +<h3 class=fn>type * <a name="operator++"></a>TQPtrListIterator::operator++ () +</h3> + +<p> Prefix ++ makes the succeeding item current and returns the new +current item. +<p> If the current iterator item was the last item in the list or if +it was 0, 0 is returned. + +<h3 class=fn>type * <a name="operator+-eq"></a>TQPtrListIterator::operator+= ( uint jump ) +</h3> + +<p> Sets the current item to the item <em>jump</em> positions after the +current item and returns a pointer to that item. +<p> If that item is beyond the last item or if the list is empty, it +sets the current item to 0 and returns 0 + +<h3 class=fn>type * <a name="operator--"></a>TQPtrListIterator::operator-- () +</h3> + +<p> Prefix - makes the preceding item current and returns the new +current item. +<p> If the current iterator item was the first item in the list or if +it was 0, 0 is returned. + +<h3 class=fn>type * <a name="operator--eq"></a>TQPtrListIterator::operator-= ( uint jump ) +</h3> + +<p> Returns the item <em>jump</em> positions before the current item or 0 +if it is beyond the first item. Makes this the current item. + +<h3 class=fn><a href="tqptrlistiterator.html">TQPtrListIterator</a><type> & <a name="operator-eq"></a>TQPtrListIterator::operator= ( const <a href="tqptrlistiterator.html">TQPtrListIterator</a><type> & it ) +</h3> + +<p> Assignment. Makes a copy of the iterator <em>it</em> and returns a +reference to this iterator. + +<h3 class=fn>type * <a name="toFirst"></a>TQPtrListIterator::toFirst () +</h3> + +<p> Sets the current iterator item to point to the first list item and +returns a pointer to the item. Sets the current item to 0 and +returns 0 if the list is empty. +<p> <p>See also <a href="#toLast">toLast</a>() and <a href="#atFirst">atFirst</a>(). + +<h3 class=fn>type * <a name="toLast"></a>TQPtrListIterator::toLast () +</h3> + +<p> Sets the current iterator item to point to the last list item and +returns a pointer to the item. Sets the current item to 0 and +returns 0 if the list is empty. +<p> <p>See also <a href="#toFirst">toFirst</a>() and <a href="#atLast">atLast</a>(). + +<!-- eof --> +<hr><p> +This file is part of the <a href="index.html">TQt toolkit</a>. +Copyright © 1995-2007 +<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 © 2007 +<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> +<td align=right><div align=right>TQt 3.3.8</div> +</table></div></address></body> +</html> |