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, 

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     6 <!-- Initial Contributors:

     7     Nokia Corporation - initial contribution.

     8 Contributors: 

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    10 <!DOCTYPE concept

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

    12 <concept xml:lang="en" id="GUID-96C7CBD4-4B25-5AA1-A54F-1764B54FDC7E"><title>How to write a derived class with two-phase construction</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>When writing a derived class, you must use the derived class <codeph>ConstructL()</codeph> to call the correct base class <codeph>ConstructL()</codeph>. </p> <p>Call the base class <codeph>ConstructL()</codeph> before the derived-class specific construction starts. This mirrors the action of C++ constructors.</p> <codeblock id="GUID-DA0E4184-AC27-565F-9DA1-2CBB59A1E949" xml:space="preserve">class CCompoundDerived : public CCompound

    13     {

    14 public:

    15     ...

    16 protected:

    17     ...

    18     void ConstructL();

    19 private:

    20     ...

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

    22     {

    23     this->CCompound::ConstructL();

    24     // own construction

    25     }</codeblock> </conbody></concept>