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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<?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 task |
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PUBLIC "-//OASIS//DTD DITA Task//EN" "task.dtd"> |
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<task id="GUID-69D916D3-ED05-58DA-BA42-CE4D7E4F6482" xml:lang="en"><title>Automatic |
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Resource Management Class Templates Tutorial</title><abstract>The <codeph>LCleanedupX</codeph> class provide a means of automatically |
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cleaning up local variables on scope exit. Variants are provided for cleaning |
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up pointers, references, handles and arrays, as well as generic cleanup items. |
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The user is able to define a cleanup strategy to clean up the resource on |
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scope exit.</abstract><prolog><metadata><keywords/></metadata></prolog><taskbody> |
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<prereq><p>Before beginning you must know the following: </p><ul> |
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<li id="GUID-90A3678E-CB31-5817-AB27-C115AC486A3A"><p> <b> Clean-up Stratergy:</b> Cleanup |
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strategies can be specified as an optional template parameter of the class |
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templates for automatic resource management. </p> </li> |
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</ul> </prereq> |
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<steps-unordered> |
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<step id="GUID-26218FF0-6994-4FD7-9609-357AFDB3C177"><cmd><b>Declaring an LCleanedupX object</b></cmd> |
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<info><p>An <codeph>LCleanedupX</codeph> object is declared using one of the |
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class template constructors. The type to be managed is declared as the first |
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template parameter. An optional second template parameter can be declared |
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to implement a non-default cleanup strategy. </p> <p>An example code snippet |
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for declaring <codeph>LCleanedupX</codeph> class is shown below: </p> <codeblock id="GUID-B9DFC2F9-0C7A-5CCA-9125-FC165BFA6C1B" xml:space="preserve">class LCleanedupPtr |
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{ |
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CTicker* ticker1 = new(ELeave) CTicker; |
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LCleanedupPtr CManagedUserTwoPhase one(CManagedUserTwoPhase::NewL(ticker1)); |
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|
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CTicker* ticker2 = new(ELeave) CTicker; |
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LCleanedupPtr CManagedUserSinglePhase two(CManagedUserSinglePhase::NewL(ticker2)); |
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} |
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</codeblock></info> |
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</step> |
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<step id="GUID-AF65DC71-78C1-4B4D-9546-A9F4921E89D9"><cmd><b>Disabling Automatic Cleanup</b></cmd> |
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<info><p>An object that is being managed by an <codeph>LCleanedupX</codeph> class |
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can be unmanaged by calling the <codeph>Unmanage()</codeph> method of the |
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LCleanedupX class. </p> <p>The managing object can be accessed using the . |
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operator as in the call to <codeph>Unmanage()</codeph>. The <codeph>Unmanage()</codeph> disables |
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cleanup and yields the previously managed pointer so that it can be safely |
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returned. </p> <p>An example code snippet is given below: </p> <codeblock id="GUID-75BA5FAF-4C81-5626-A1F6-8AF91FD5972E" xml:space="preserve"> |
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static CStringUserTwoPhase* NewL(const TDesC& aName) |
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{ |
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LCleanedupPtr CStringUserTwoPhase self(new(ELeave) CStringUserTwoPhase); |
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self->ConstructL(aName); |
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return self.Unmanage(); |
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} |
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</codeblock></info> |
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</step> |
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<step id="GUID-B9F7C183-E92E-47D6-8A6E-A1E1A76C1253"><cmd><b>Accessing the managed object</b></cmd> |
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<info><p>The managed object can be accessed using the -> operator as in the |
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call to <codeph>ConstructL()</codeph> </p> <codeblock id="GUID-2C82F4C0-9E02-51C5-BF51-2C05EACB424C" xml:space="preserve">self->ConstructL(aName);</codeblock></info> |
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</step> |
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<step id="GUID-D070D636-665B-4023-A81A-C5AB0A5390CB"><cmd><b>Passing the managed object to a function</b></cmd> |
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<info><p>The managed object can be passed to a function by dereferencing the |
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managing object. An example code snippet is given below: </p> <codeblock id="GUID-5E5A3A0C-77E4-520A-BD0A-031C7D3CAAFD" xml:space="preserve"> |
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void RegisterTicker(CTicker& aTicker) |
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{ |
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(void)aTicker; |
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} |
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</codeblock><p>The <codeph>RegisterTicker</codeph> function defined above |
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takes a <codeph>CTicker&</codeph> argument. If we have a <codeph>LCleanedupPtr<CTicker></codeph> as |
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defined below, we can pass the <codeph>CTicker</codeph> object to the function |
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by dereferencing as shown below in the code snippet: </p> <codeblock id="GUID-EC93EC4F-3D3E-5A70-A0E1-CF73475A7309" xml:space="preserve"> |
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LCleanedupPtr CTicker t(new(ELeave) CTicker); |
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|
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RegisterTicker(*t); // Takes a CTicker& |
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</codeblock></info> |
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</step> |
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</steps-unordered> |
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</taskbody><related-links> |
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<link href="GUID-B1D5B680-00E3-5702-985A-94256180E2D8.dita"><linktext>Automatic |
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Resource Management</linktext></link> |
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<link href="GUID-B419D99E-8312-5336-9693-3ED8DFCD0559.dita"><linktext>Automatic |
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Resource Management Tutorial</linktext></link> |
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</related-links></task> |