Symbian3/PDK/Source/GUID-B9F07057-4B31-5FE8-BE4C-98CC8151CD29.dita
author Dominic Pinkman <Dominic.Pinkman@Nokia.com>
Thu, 11 Mar 2010 18:02:22 +0000
changeset 3 46218c8b8afa
parent 1 25a17d01db0c
child 5 f345bda72bc4
permissions -rw-r--r--
week 10 bug fix submission (SF PDK version): Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
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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-B9F07057-4B31-5FE8-BE4C-98CC8151CD29" xml:lang="en"><title>Single
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Phase Constructor Tutorial</title><shortdesc>Single phase construction is enabled by defining the <apiname>CONSTRUCTORS_MAY_LEAVE()</apiname> macro
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in a public section of a class definition if the single phase construction
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is part of the public interface of the class. </shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody>
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<prereq><p><b>Required background</b></p><p>Before beginning you must know
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the following: </p> <ul>
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<li id="GUID-DC57A39F-122C-545C-A2A1-D26F71209C10"><p> <b>RAII:</b> The Resource
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Acquisition Is Initialization (RAII) idiom is the basis of the implementation
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of the smart pointer class templates. </p> </li>
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<li id="GUID-C0228985-A32D-5652-8CCC-4BF401998FCC"><p> <xref href="GUID-764C2888-7EA7-3F58-B519-878A82E879CA.dita"><apiname>CONSTRUCTORS_MAY_LEAVE()</apiname></xref>:
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This macro is used for enabling single phase construction, particularly for
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CBase-derived classes. </p> </li>
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</ul> </prereq>
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<context><p>Single phase constructor provides a means to use the RAII concepts
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for Symbian Developers who are familiar with C++ standards. It is provided
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as a tool and needs to be used after careful consideration. </p> </context>
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<steps id="GUID-DF51DCE9-ACA3-4376-B4B3-4A31728670D2">
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<step id="GUID-FA70E487-145A-4502-BB58-B09A42F69183"><cmd>Enabling single
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phase constructor</cmd>
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<stepxmp><p>Single phase construction is enabled by defining the CONSTRUCTORS_MAY_LEAVE()
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macro in a public section of a class definition if the single phase construction
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is part of the public interface of the class. An example of this is given
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below: </p><codeblock xml:space="preserve">class CManagedUserSinglePhase : public CBase
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	{
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public:
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	CONSTRUCTORS_MAY_LEAVE
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	static CManagedUserSinglePhase* NewL(CTicker* aTicker)
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		{
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		return new(ELeave) CManagedUserSinglePhase(aTicker);
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		}
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	. . .
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	}	</codeblock></stepxmp>
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</step>
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<step id="GUID-5A449AB7-512E-4701-928A-2209C1A41A06"><cmd>Using single phase
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constructor</cmd>
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<stepxmp><p>This macro must be used within a public section of a class definition,
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if the single phase construction is part of the public interface of the class.
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Other classes, not derived from CBase will not be affected by this macro. </p><p>The
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following example code snippet the class demonstrates the use of an embedded
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string in the ingle-phase construction pattern, where a leave-safe constructor
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fully initializes the object.  </p><codeblock xml:space="preserve">class CStringUserSinglePhase : public CBase
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	{
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public:
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		CONSTRUCTORS_MAY_LEAVE
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	static CStringUserSinglePhase* NewL(const TDesC&amp; aName)
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		{
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		return new(ELeave) CStringUserSinglePhase(aName);
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		}
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	~CStringUserSinglePhase()
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		{
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		}</codeblock></stepxmp>
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</step>
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<step id="GUID-D41D3443-FBFA-44DA-8E35-E82C12829F3D"><cmd>Need to declare the CONSTRUCTORS_MAY_LEAVE macro</cmd>
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<stepxmp><p>This is necessary because Symbian platform currently lacks the
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placement delete operator counterparts corresponding to the CBase placement
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new operators that take a TLeave parameter (new(ELeave)). The macro defines
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these missing placement delete operators and ensures that all allocated memory
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can be freed if a constructor leaves.</p></stepxmp>
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</step>
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</steps>
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</taskbody><related-links>
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<link href="GUID-B007634D-4D55-528A-8B85-6120C633AC8B.dita"><linktext>EUser High
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Level Library Overview</linktext></link>
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<link href="GUID-96AB1D5A-932E-55BE-A025-F01608546B99.dita"><linktext>RAII Idiom</linktext>
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</link>
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</related-links></task>