author | Dominic Pinkman <dominic.pinkman@nokia.com> |
Fri, 11 Jun 2010 12:39:03 +0100 | |
changeset 8 | ae94777fff8f |
parent 0 | 89d6a7a84779 |
permissions | -rw-r--r-- |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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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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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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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-C6AB2B3A-BBFC-5B57-BECB-F46C96250502" xml:lang="en"><title>Cleanup |
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stack support for non-CBase classes</title><shortdesc>The cleanup stack supports other types of cleanup using <codeph>CleanupStack::PushL()</codeph>.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>The discussion of clean up so far has assumed objects to be cleaned up |
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are derived from <codeph>CBase</codeph>, with clean up by invoking <codeph>delete</codeph>. |
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Other classes need explicit cleanup support to be provided by the programmer. </p> |
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<p>The cleanup stack supports other types of cleanup. You can push: </p> |
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<ul> |
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<li id="GUID-7BD04FAD-E88D-5549-95DA-B62C5D07493F"><p>a pointer to any type |
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of object. This is an object of type <codeph>TAny*</codeph>. The cleanupstack |
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destroys this type of object with a call to <codeph>User::Free()</codeph> on |
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the pointer pushed. This is less powerful than standard cleanup, because it |
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frees memory and does not call the C++ destructor. </p> <p>You use the <codeph>CleanupStack::PushL(TAny* |
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Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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aPtr);</codeph> overload. </p> </li> |
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<li id="GUID-2D143181-B8B5-5449-B29C-358CE7F8FB4A"><p>a pointer to an object |
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together with a specific cleanup operation for that object. The pointer and |
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the cleanup operation are contained in a <codeph>TCleanupItem</codeph> object. </p> <p>You |
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use the <codeph>CleanupStack::PushL(TCleanupItem anItem)</codeph> overload. </p> <p>You |
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must understand that the <codeph>TCleanupItem</codeph> object does not go |
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on the cleanupstack. The pointer to the object that is contained within the <codeph>TCleanupItem</codeph> object |
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goes on the cleanupstack. For example, if you created a TCleanupItem called |
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myCleanupItem, you must never call <codeph>CleanupStack::Pop(myCleanupItem);</codeph> </p> </li> |
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</ul> |
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<p>Some utility functions are provided that make construction of a suitable <codeph>TCleanupItem</codeph> easy. |
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See <xref href="GUID-18EF9CFA-5080-5F89-89EC-C64897612D6B.dita">How to clean up |
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non-CBase classes</xref>.</p> |
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</conbody></concept> |