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212 lines
9.5 KiB
212 lines
9.5 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/qcache.doc:293 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>TQCacheIterator 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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<font color="#004faf">Main Classes</font></a>
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<font color="#004faf">Functions</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>TQCacheIterator Class Reference</h1>
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<p>The TQCacheIterator class provides an iterator for TQCache collections.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qcache-h.html">qcache.h</a>></tt>
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<p><a href="qcacheiterator-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><a href="#TQCacheIterator"><b>TQCacheIterator</b></a> ( const TQCache<type> & cache )</li>
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<li class=fn><a href="#TQCacheIterator-2"><b>TQCacheIterator</b></a> ( const TQCacheIterator<type> & ci )</li>
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<li class=fn>TQCacheIterator<type> & <a href="#operator-eq"><b>operator=</b></a> ( const TQCacheIterator<type> & ci )</li>
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<li class=fn>uint <a href="#count"><b>count</b></a> () const</li>
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<li class=fn>bool <a href="#isEmpty"><b>isEmpty</b></a> () const</li>
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<li class=fn>bool <a href="#atFirst"><b>atFirst</b></a> () const</li>
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<li class=fn>bool <a href="#atLast"><b>atLast</b></a> () const</li>
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<li class=fn>type * <a href="#toFirst"><b>toFirst</b></a> ()</li>
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<li class=fn>type * <a href="#toLast"><b>toLast</b></a> ()</li>
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<li class=fn><a href="#operator-type-*"><b>operator type *</b></a> () const</li>
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<li class=fn>type * <a href="#current"><b>current</b></a> () const</li>
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<li class=fn>TQString <a href="#currentKey"><b>currentKey</b></a> () const</li>
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<li class=fn>type * <a href="#operator()"><b>operator()</b></a> ()</li>
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<li class=fn>type * <a href="#operator++"><b>operator++</b></a> ()</li>
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<li class=fn>type * <a href="#operator+-eq"><b>operator+=</b></a> ( uint jump )</li>
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<li class=fn>type * <a href="#operator--"><b>operator--</b></a> ()</li>
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<li class=fn>type * <a href="#operator--eq"><b>operator-=</b></a> ( uint jump )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQCacheIterator class provides an iterator for <a href="qcache.html">TQCache</a> collections.
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<p>
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<p> Note that the traversal order is arbitrary; you are not guaranteed
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any particular order. If new objects are inserted into the cache
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while the iterator is active, the iterator may or may not see
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them.
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<p> Multiple iterators are completely independent, even when they
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operate on the same TQCache. TQCache updates all iterators that
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refer an item when that item is removed.
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<p> TQCacheIterator provides an <a href="#operator++">operator++</a>(), and an <a href="#operator+-eq">operator+=</a>() to
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traverse the cache. The <a href="#current">current</a>() and <a href="#currentKey">currentKey</a>() functions are
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used to access the current cache item and its key. The <a href="#atFirst">atFirst</a>()
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and <a href="#atLast">atLast</a>() return TRUE if the iterator points to the first or
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last item in the cache respectively. The <a href="#isEmpty">isEmpty</a>() function
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returns TRUE if the cache is empty, and <a href="#count">count</a>() returns the number
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of items in the cache.
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<p> Note that atFirst() and atLast() refer to the iterator's arbitrary
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ordering, not to the cache's internal least recently used list.
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<p> <p>See also <a href="qcache.html">TQCache</a>, <a href="collection.html">Collection Classes</a>, and <a href="tools.html">Non-GUI Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQCacheIterator"></a>TQCacheIterator::TQCacheIterator ( const <a href="qcache.html">TQCache</a><type> & cache )
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</h3>
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<p> Constructs an iterator for <em>cache</em>. The current iterator item is
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set to point to the first item in the <em>cache</em>.
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<h3 class=fn><a name="TQCacheIterator-2"></a>TQCacheIterator::TQCacheIterator ( const <a href="qcacheiterator.html">TQCacheIterator</a><type> & ci )
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</h3>
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<p> Constructs an iterator for the same cache as <em>ci</em>. The new
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iterator starts at the same item as ci.<a href="#current">current</a>(), but moves
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independently from there on.
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<h3 class=fn>bool <a name="atFirst"></a>TQCacheIterator::atFirst () const
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</h3>
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<p> Returns TRUE if the iterator points to the first item in the
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cache; otherwise returns FALSE. Note that this refers to the
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iterator's arbitrary ordering, not to the cache's internal least
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recently used list.
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<p> <p>See also <a href="#toFirst">toFirst</a>() and <a href="#atLast">atLast</a>().
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<h3 class=fn>bool <a name="atLast"></a>TQCacheIterator::atLast () const
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</h3>
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<p> Returns TRUE if the iterator points to the last item in the cache;
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otherwise returns FALSE. Note that this refers to the iterator's
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arbitrary ordering, not to the cache's internal least recently
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used list.
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<p> <p>See also <a href="#toLast">toLast</a>() and <a href="#atFirst">atFirst</a>().
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<h3 class=fn>uint <a name="count"></a>TQCacheIterator::count () const
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</h3>
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<p> Returns the number of items in the cache on which this iterator
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operates.
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<p> <p>See also <a href="#isEmpty">isEmpty</a>().
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<h3 class=fn>type * <a name="current"></a>TQCacheIterator::current () const
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</h3>
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<p> Returns a pointer to the current iterator item.
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<h3 class=fn><a href="qstring.html">TQString</a> <a name="currentKey"></a>TQCacheIterator::currentKey () const
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</h3>
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<p> Returns the key for the current iterator item.
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<h3 class=fn>bool <a name="isEmpty"></a>TQCacheIterator::isEmpty () const
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</h3>
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<p> Returns TRUE if the cache is empty, i.e. <a href="#count">count</a>() == 0; otherwise
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it returns FALSE.
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<p> <p>See also <a href="#count">count</a>().
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<h3 class=fn><a name="operator-type-*"></a>TQCacheIterator::operator type * () const
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</h3>
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<p> Cast operator. Returns a pointer to the current iterator item.
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Same as <a href="#current">current</a>().
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<h3 class=fn>type * <a name="operator()"></a>TQCacheIterator::operator() ()
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</h3>
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<p> Makes the succeeding item current and returns the original current
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item.
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<p> If the current iterator item was the last item in the cache or if
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it was 0, 0 is returned.
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<h3 class=fn>type * <a name="operator++"></a>TQCacheIterator::operator++ ()
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</h3>
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<p> Prefix++ makes the iterator point to the item just after <a href="#current">current</a>()
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and makes that the new current item for the iterator. If current()
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was the last item, <a href="#operator++">operator++</a>() returns 0.
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<h3 class=fn>type * <a name="operator+-eq"></a>TQCacheIterator::operator+= ( uint jump )
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</h3>
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<p> Returns the item <em>jump</em> positions after the current item, or 0 if
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it is beyond the last item. Makes this the current item.
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<h3 class=fn>type * <a name="operator--"></a>TQCacheIterator::operator-- ()
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</h3>
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<p> Prefix-- makes the iterator point to the item just before
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<a href="#current">current</a>() and makes that the new current item for the iterator. If
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current() was the first item, <a href="#operator--">operator--</a>() returns 0.
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<h3 class=fn>type * <a name="operator--eq"></a>TQCacheIterator::operator-= ( uint jump )
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</h3>
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<p> Returns the item <em>jump</em> positions before the current item, or 0
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if it is before the first item. Makes this the current item.
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<h3 class=fn><a href="qcacheiterator.html">TQCacheIterator</a><type> & <a name="operator-eq"></a>TQCacheIterator::operator= ( const <a href="qcacheiterator.html">TQCacheIterator</a><type> & ci )
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</h3>
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<p> Makes this an iterator for the same cache as <em>ci</em>. The new
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iterator starts at the same item as ci.<a href="#current">current</a>(), but moves
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independently thereafter.
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<h3 class=fn>type * <a name="toFirst"></a>TQCacheIterator::toFirst ()
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</h3>
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<p> Sets the iterator to point to the first item in the cache and
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returns a pointer to the item.
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<p> Sets the iterator to 0 and returns 0 if the cache is empty.
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<p> <p>See also <a href="#toLast">toLast</a>() and <a href="#isEmpty">isEmpty</a>().
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<h3 class=fn>type * <a name="toLast"></a>TQCacheIterator::toLast ()
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</h3>
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<p> Sets the iterator to point to the last item in the cache and
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returns a pointer to the item.
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<p> Sets the iterator to 0 and returns 0 if the cache is empty.
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<p> <p>See also <a href="#toFirst">toFirst</a>() and <a href="#isEmpty">isEmpty</a>().
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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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