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178 lines
9.5 KiB
178 lines
9.5 KiB
14 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/src/tools/qptrcollection.cpp:40 -->
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>QPtrCollection Class</title>
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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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>QPtrCollection Class Reference</h1>
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<p>The QPtrCollection class is the base class of most pointer-based Qt collections.
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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 Qt is built with thread support.</p>
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<p><tt>#include <<a href="qptrcollection-h.html">qptrcollection.h</a>></tt>
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<p>Inherited by <a href="qasciicache.html">QAsciiCache</a>, <a href="qasciidict.html">QAsciiDict</a>, <a href="qcache.html">QCache</a>, <a href="qdict.html">QDict</a>, <a href="qintcache.html">QIntCache</a>, <a href="qintdict.html">QIntDict</a>, <a href="qptrlist.html">QPtrList</a>, <a href="qptrdict.html">QPtrDict</a>, and <a href="qptrvector.html">QPtrVector</a>.
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<p><a href="qptrcollection-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>bool <a href="#autoDelete"><b>autoDelete</b></a> () const</li>
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<li class=fn>void <a href="#setAutoDelete"><b>setAutoDelete</b></a> ( bool enable )</li>
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<li class=fn>virtual uint <a href="#count"><b>count</b></a> () const = 0</li>
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<li class=fn>virtual void <a href="#clear"><b>clear</b></a> () = 0</li>
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<li class=fn>typedef void * <a href="#Item"><b>Item</b></a></li>
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</ul>
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<h2>Protected Members</h2>
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<ul>
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<li class=fn><a href="#QPtrCollection"><b>QPtrCollection</b></a> ()</li>
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<li class=fn><a href="#QPtrCollection-2"><b>QPtrCollection</b></a> ( const QPtrCollection & source )</li>
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<li class=fn>virtual <a href="#~QPtrCollection"><b>~QPtrCollection</b></a> ()</li>
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<li class=fn>virtual Item <a href="#newItem"><b>newItem</b></a> ( Item d )</li>
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<li class=fn>virtual void <a href="#deleteItem"><b>deleteItem</b></a> ( Item d ) = 0</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QPtrCollection class is the base class of most pointer-based Qt collections.
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<p>
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<p> The QPtrCollection class is an abstract base class for the Qt
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<a href="collection.html">collection classes</a> <a href="qdict.html">QDict</a>, <a href="qptrlist.html">QPtrList</a>,
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etc. Qt also includes value based collections, e.g. <a href="qvaluelist.html">QValueList</a>,
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<a href="qmap.html">QMap</a>, etc.
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<p> A QPtrCollection only knows about the number of objects in the
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collection and the deletion strategy (see <a href="#setAutoDelete">setAutoDelete</a>()).
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<p> A collection is implemented using the <a href="#Item">Item</a> (generic collection
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item) type, which is a <tt>void*</tt>. The template classes that create
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the real collections cast the <a href="#Item">Item</a> to the required type.
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<p>See also <a href="collection.html">Collection 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="Item"></a>QPtrCollection::Item</h3>
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<p> This type is the generic "item" in a QPtrCollection.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QPtrCollection"></a>QPtrCollection::QPtrCollection ()<tt> [protected]</tt>
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</h3>
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<p> Constructs a collection. The constructor is protected because
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QPtrCollection is an abstract class.
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<h3 class=fn><a name="QPtrCollection-2"></a>QPtrCollection::QPtrCollection ( const <a href="qptrcollection.html">QPtrCollection</a> & source )<tt> [protected]</tt>
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</h3>
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<p> Constructs a copy of <em>source</em> with <a href="#autoDelete">autoDelete</a>() set to FALSE. The
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constructor is protected because QPtrCollection is an abstract
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class.
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<p> Note that if <em>source</em> has autoDelete turned on, copying it will
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risk memory leaks, reading freed memory, or both.
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<h3 class=fn><a name="~QPtrCollection"></a>QPtrCollection::~QPtrCollection ()<tt> [virtual protected]</tt>
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</h3>
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<p> Destroys the collection. The destructor is protected because
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QPtrCollection is an abstract class.
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<h3 class=fn>bool <a name="autoDelete"></a>QPtrCollection::autoDelete () const
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</h3>
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<p> Returns the setting of the auto-delete option. The default is FALSE.
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<p> <p>See also <a href="#setAutoDelete">setAutoDelete</a>().
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<h3 class=fn>void <a name="clear"></a>QPtrCollection::clear ()<tt> [pure virtual]</tt>
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</h3>
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<p> Removes all objects from the collection. The objects will be
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deleted if auto-delete has been enabled.
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<p> <p>See also <a href="#setAutoDelete">setAutoDelete</a>().
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<p>Reimplemented in <a href="qasciicache.html#clear">QAsciiCache</a>, <a href="qasciidict.html#clear">QAsciiDict</a>, <a href="qcache.html#clear">QCache</a>, <a href="qdict.html#clear">QDict</a>, <a href="qintcache.html#clear">QIntCache</a>, <a href="qintdict.html#clear">QIntDict</a>, <a href="qptrlist.html#clear">QPtrList</a>, <a href="qptrdict.html#clear">QPtrDict</a>, and <a href="qptrvector.html#clear">QPtrVector</a>.
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<h3 class=fn>uint <a name="count"></a>QPtrCollection::count () const<tt> [pure virtual]</tt>
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</h3>
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<p> Returns the number of objects in the collection.
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<p>Reimplemented in <a href="qasciicache.html#count">QAsciiCache</a>, <a href="qasciidict.html#count">QAsciiDict</a>, <a href="qcache.html#count">QCache</a>, <a href="qdict.html#count">QDict</a>, <a href="qintcache.html#count">QIntCache</a>, <a href="qintdict.html#count">QIntDict</a>, <a href="qptrlist.html#count">QPtrList</a>, <a href="qptrdict.html#count">QPtrDict</a>, and <a href="qptrvector.html#count">QPtrVector</a>.
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<h3 class=fn>void <a name="deleteItem"></a>QPtrCollection::deleteItem ( <a href="qptrcollection.html#Item">Item</a> d )<tt> [pure virtual protected]</tt>
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</h3>
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<p> Reimplement this function if you want to be able to delete items.
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<p> Deletes an item that is about to be removed from the collection.
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<p> This function has to reimplemented in the collection template
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classes, and should <em>only</em> delete item <em>d</em> if auto-delete has
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been enabled.
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<p> <b>Warning:</b> If you reimplement this function you must also
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reimplement the destructor and call the virtual function <a href="#clear">clear</a>()
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from your destructor. This is due to the way virtual functions and
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destructors work in C++: Virtual functions in derived classes
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cannot be called from a destructor. If you do not do this, your
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<a href="#deleteItem">deleteItem</a>() function will not be called when the container is
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destroyed.
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<p> <p>See also <a href="#newItem">newItem</a>() and <a href="#setAutoDelete">setAutoDelete</a>().
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<h3 class=fn><a href="qptrcollection.html#Item">Item</a> <a name="newItem"></a>QPtrCollection::newItem ( <a href="qptrcollection.html#Item">Item</a> d )<tt> [virtual protected]</tt>
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</h3>
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Virtual function that creates a copy of an object that is about to
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be inserted into the collection.
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<p> The default implementation returns the <em>d</em> pointer, i.e. no copy
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is made.
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<p> This function is seldom reimplemented in the collection template
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classes. It is not common practice to make a copy of something
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that is being inserted.
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<p> <p>See also <a href="#deleteItem">deleteItem</a>().
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<h3 class=fn>void <a name="setAutoDelete"></a>QPtrCollection::setAutoDelete ( bool enable )
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</h3>
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<p> Sets the collection to auto-delete its contents if <em>enable</em> is
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TRUE and to never delete them if <em>enable</em> is FALSE.
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<p> If auto-deleting is turned on, all the items in a collection are
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deleted when the collection itself is deleted. This is convenient
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if the collection has the only pointer to the items.
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<p> The default setting is FALSE, for safety. If you turn it on, be
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careful about copying the collection - you might find yourself
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with two collections deleting the same items.
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<p> Note that the auto-delete setting may also affect other functions
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in subclasses. For example, a subclass that has a remove()
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function will remove the item from its data structure, and if
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auto-delete is enabled, will also delete the item.
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<p> <p>See also <a href="#autoDelete">autoDelete</a>().
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<p>Examples: <a href="grapher-nsplugin-example.html#x2769">grapher/grapher.cpp</a>, <a href="scribble-example.html#x924">scribble/scribble.cpp</a>, and <a href="bigtable-example.html#x1291">table/bigtable/main.cpp</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">Qt 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>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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