Symbian3/PDK/Source/GUID-0970A970-6E56-556C-B032-B7EAF8ABBBA6.dita
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
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parent 5 f345bda72bc4
permissions -rw-r--r--
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License 
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"Eclipse Public License v1.0" which accompanies this distribution, 
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors: 
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-0970A970-6E56-556C-B032-B7EAF8ABBBA6" xml:lang="en"><title>How
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to use CleanupReleasePushL()</title><shortdesc><codeph>CleanupReleasePushL()</codeph> pushes a <codeph>TCleanupItem</codeph> onto
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the cleanup stack ready for <codeph>CleanupStack::PopAndDestroy()</codeph> to
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release.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>The <codeph>CleanupReleasePushL()</codeph> templated function constructs
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and pushes a <codeph>TCleanupItem</codeph> onto the cleanup stack. When <codeph>CleanupStack::PopAndDestroy()</codeph> is
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called, the <codeph>Release()</codeph> member function of the object encapsulated
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by the <codeph>TCleanupItem</codeph> is called.</p>
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<codeblock id="GUID-5CBFFD7F-68B3-55E5-9518-2A2899710AAA" xml:space="preserve">...
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RTestThree three;
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CleanupReleasePushL(three);
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...
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CleanupStack::PopAndDestroy();
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...
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</codeblock>
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<p>The <codeph>TCleanupItem</codeph> object encapsulates a reference to the <codeph>RTestThree</codeph> object;
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the cleanup operation is the static function <codeph>Release()</codeph> of
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the templated class <codeph>CleanupRelease&lt;class T&gt;</codeph>. This is implemented
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by simply calling the <codeph>Release()</codeph> member function of <codeph>RTestThree</codeph>.
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This means that <codeph>RTestThree</codeph> must define or inherit a member
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function <codeph>Release()</codeph> which performs whatever clean up is required.</p>
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</conbody></concept>