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-- |
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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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|
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static CStringUserSinglePhase* NewL(const TDesC& aName) |
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{ |
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return new(ELeave) CStringUserSinglePhase(aName); |
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} |
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|
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~CStringUserSinglePhase() |
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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-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> |