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

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

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

in a derived class with example code.</shortdesc><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

    {

public:

    ...

protected:

    ...

    void ConstructL();

private:

    ...

    };</codeblock>

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

    {

    this->CCompound::ConstructL();

    // own construction

    }</codeblock>

</conbody></concept>