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7 Nokia Corporation - initial contribution. |
7 Nokia Corporation - initial contribution. |
8 Contributors: |
8 Contributors: |
9 --> |
9 --> |
10 <!DOCTYPE concept |
10 <!DOCTYPE concept |
11 PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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 |
12 <concept id="GUID-96C7CBD4-4B25-5AA1-A54F-1764B54FDC7E" xml:lang="en"><title>How |
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13 to write a derived class with two-phase construction</title><shortdesc>This document illustrates how to implement two-phase construction |
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14 in a derived class with example code.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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15 <p>When writing a derived class, you must use the derived class <codeph>ConstructL()</codeph> to |
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16 call the correct base class <codeph>ConstructL()</codeph>. </p> |
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17 <p>Call the base class <codeph>ConstructL()</codeph> before the derived-class |
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18 specific construction starts. This mirrors the action of C++ constructors.</p> |
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19 <codeblock id="GUID-DA0E4184-AC27-565F-9DA1-2CBB59A1E949" xml:space="preserve">class CCompoundDerived : public CCompound |
13 { |
20 { |
14 public: |
21 public: |
15 ... |
22 ... |
16 protected: |
23 protected: |
17 ... |
24 ... |
18 void ConstructL(); |
25 void ConstructL(); |
19 private: |
26 private: |
20 ... |
27 ... |
21 };</codeblock> <codeblock id="GUID-C67C0AC0-8974-54C2-AEBE-0557DA7C6838" xml:space="preserve">void CCompoundDerived::ConstructL() |
28 };</codeblock> |
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29 <codeblock id="GUID-C67C0AC0-8974-54C2-AEBE-0557DA7C6838" xml:space="preserve">void CCompoundDerived::ConstructL() |
22 { |
30 { |
23 this->CCompound::ConstructL(); |
31 this->CCompound::ConstructL(); |
24 // own construction |
32 // own construction |
25 }</codeblock> </conbody></concept> |
33 }</codeblock> |
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34 </conbody></concept> |