1 <?xml version="1.0" encoding="utf-8"?>

     2 <!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->

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     4 "Eclipse Public License v1.0" which accompanies this distribution, 

     5 and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->

     6 <!-- Initial Contributors:

     7     Nokia Corporation - initial contribution.

     8 Contributors: 

     9 -->

    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

    12 <concept id="GUID-96C7CBD4-4B25-5AA1-A54F-1764B54FDC7E" xml:lang="en"><title>How

    13 to write a derived class with two-phase construction</title><shortdesc>This document illustrates how to implement two-phase construction

    14 in a derived class with example code.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

    15 <p>When writing a derived class, you must use the derived class <codeph>ConstructL()</codeph> to

    16 call the correct base class <codeph>ConstructL()</codeph>. </p>

    17 <p>Call the base class <codeph>ConstructL()</codeph> before the derived-class

    18 specific construction starts. This mirrors the action of C++ constructors.</p>

    19 <codeblock id="GUID-DA0E4184-AC27-565F-9DA1-2CBB59A1E949" xml:space="preserve">class CCompoundDerived : public CCompound

    20     {

    21 public:

    22     ...

    23 protected:

    24     ...

    25     void ConstructL();

    26 private:

    27     ...

    28     };</codeblock>

    29 <codeblock id="GUID-C67C0AC0-8974-54C2-AEBE-0557DA7C6838" xml:space="preserve">void CCompoundDerived::ConstructL()

    30     {

    31     this->CCompound::ConstructL();

    32     // own construction

    33     }</codeblock>

    34 </conbody></concept>