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<!DOCTYPE concept
  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-&gt;CCompound::ConstructL();
    // own construction
    }</codeblock>
</conbody></concept>