Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_c_classes_8cpp_source.html
author Dominic Pinkman <dominic.pinkman@nokia.com>
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Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
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<title>TB9.2 Example Applications: examples/Basics/CClasses/CClasses.cpp Source File</title>
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<link href="tabs.css" rel="stylesheet" type="text/css"/>
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<link href="doxygen.css" rel="stylesheet" type="text/css"/>
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</head>
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<body>
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<!-- Generated by Doxygen 1.6.2 -->
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<h1>examples/Basics/CClasses/CClasses.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (c) 2000-2009 Nokia Corporation and/or its subsidiary(-ies).</span>
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<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
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<a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span>
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<a name="l00004"></a>00004 <span class="comment">// under the terms of &quot;Eclipse Public License v1.0&quot;</span>
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<a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span>
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<a name="l00006"></a>00006 <span class="comment">// at the URL &quot;http://www.eclipse.org/legal/epl-v10.html&quot;.</span>
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<a name="l00007"></a>00007 <span class="comment">//</span>
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<a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span>
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<a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span>
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<a name="l00010"></a>00010 <span class="comment">//</span>
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<a name="l00011"></a>00011 <span class="comment">// Contributors:</span>
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<a name="l00012"></a>00012 <span class="comment">//</span>
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<a name="l00013"></a>00013 <span class="comment">// Description:</span>
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<a name="l00014"></a>00014 <span class="comment">//</span>
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<a name="l00015"></a>00015 
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<a name="l00016"></a>00016 <span class="preprocessor">#include &quot;CommonFramework.h&quot;</span>
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<a name="l00017"></a>00017 
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<a name="l00018"></a>00018 <span class="comment">// start of real example</span>
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<a name="l00019"></a>00019 
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<a name="l00020"></a>00020 <span class="comment">// #include specific files</span>
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<a name="l00021"></a>00021 
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<a name="l00022"></a>00022 <span class="comment">// class with single-phase construction, NewL and NewLC</span>
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<a name="l00023"></a>00023 
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<a name="l00024"></a>00024 <span class="keyword">class </span>COnePhaser : <span class="keyword">public</span> CBase {
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<a name="l00025"></a>00025 <span class="keyword">public</span>: <span class="comment">// data</span>
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<a name="l00026"></a>00026         TInt iInt1; <span class="comment">// one integer</span>
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<a name="l00027"></a>00027         TInt iInt2; <span class="comment">// another integer</span>
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<a name="l00028"></a>00028 <span class="keyword">public</span>: <span class="comment">// functions</span>
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<a name="l00029"></a>00029         <span class="comment">// construct/destruct</span>
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<a name="l00030"></a>00030         <span class="keyword">static</span> COnePhaser* NewL()
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<a name="l00031"></a>00031                 { <span class="comment">// construct and leave if error</span>
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<a name="l00032"></a>00032                 <span class="keywordflow">return</span> <span class="keyword">new</span> (ELeave) COnePhaser; <span class="comment">// new COnePhaser, C++ constructor</span>
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<a name="l00033"></a>00033                 };
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<a name="l00034"></a>00034         <span class="keyword">static</span> COnePhaser* NewLC()
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<a name="l00035"></a>00035                 { <span class="comment">// construct, leave if error, else push to clean-up stack</span>
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<a name="l00036"></a>00036                 COnePhaser* <span class="keyword">self</span>=COnePhaser::NewL(); <span class="comment">// construct</span>
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<a name="l00037"></a>00037                 CleanupStack::PushL(<span class="keyword">self</span>); <span class="comment">// push to clean-up stack</span>
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<a name="l00038"></a>00038                 <span class="keywordflow">return</span> <span class="keyword">self</span>; <span class="comment">// and return new object</span>
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<a name="l00039"></a>00039                 };
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<a name="l00040"></a>00040         <span class="comment">// other functions</span>
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<a name="l00041"></a>00041         <span class="keywordtype">void</span> Print()
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<a name="l00042"></a>00042                 {
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<a name="l00043"></a>00043                 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KFormat1,<span class="stringliteral">&quot;COnePhaser {TInt %d, TInt %d}&quot;</span>);
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<a name="l00044"></a>00044                 console-&gt;Printf(KFormat1, iInt1, iInt2);
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<a name="l00045"></a>00045                 }
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<a name="l00046"></a>00046 <span class="keyword">protected</span>: <span class="comment">// functions</span>
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<a name="l00047"></a>00047         <span class="comment">// construct</span>
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<a name="l00048"></a>00048         COnePhaser()
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<a name="l00049"></a>00049                 { <span class="comment">// standard C++ constructor, because it cannot leave</span>
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<a name="l00050"></a>00050                 iInt1=3; <span class="comment">// set first int to 3</span>
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<a name="l00051"></a>00051                 <span class="comment">// iInt2=0; // unnecessary</span>
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<a name="l00052"></a>00052                 }
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<a name="l00053"></a>00053         };
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<a name="l00054"></a>00054 
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<a name="l00055"></a>00055 <span class="comment">// class with two-phase construction</span>
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<a name="l00056"></a>00056 
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<a name="l00057"></a>00057 <span class="keyword">class </span>CTwoPhaser : <span class="keyword">public</span> CBase {
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<a name="l00058"></a>00058 <span class="keyword">public</span>: <span class="comment">// data</span>
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<a name="l00059"></a>00059         TInt iInt1; <span class="comment">// one integer</span>
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<a name="l00060"></a>00060         TInt iInt2; <span class="comment">// another integer</span>
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<a name="l00061"></a>00061         RTimer iTimer; <span class="comment">// a resource</span>
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<a name="l00062"></a>00062         COnePhaser* iOnePhaser; <span class="comment">// another CBase object</span>
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<a name="l00063"></a>00063 <span class="keyword">public</span>: <span class="comment">// functions</span>
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<a name="l00064"></a>00064         <span class="comment">// construct/destruct</span>
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<a name="l00065"></a>00065         <span class="keyword">static</span> CTwoPhaser* NewLC(TInt aInt1)
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<a name="l00066"></a>00066                 { <span class="comment">// construct and leave on the clean-up stack</span>
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<a name="l00067"></a>00067                 CTwoPhaser* <span class="keyword">self</span>=<span class="keyword">new</span> (ELeave) CTwoPhaser; <span class="comment">// new CTwoPhaser, initialized to binary zeroes</span>
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<a name="l00068"></a>00068                 CleanupStack::PushL(<span class="keyword">self</span>); <span class="comment">// push to clean-up stack</span>
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<a name="l00069"></a>00069                 <span class="keyword">self</span>-&gt;ConstructL(aInt1); <span class="comment">// construct</span>
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<a name="l00070"></a>00070                 <span class="keywordflow">return</span> <span class="keyword">self</span>; <span class="comment">// return new object</span>
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<a name="l00071"></a>00071                 };
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<a name="l00072"></a>00072         <span class="keyword">static</span> CTwoPhaser* NewL(TInt aInt1)
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<a name="l00073"></a>00073                 { <span class="comment">// construct and don&#39;t leave on clean-up stack</span>
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<a name="l00074"></a>00074                 CTwoPhaser* <span class="keyword">self</span>=CTwoPhaser::NewLC(aInt1); <span class="comment">// construct and leave on clean-up stack</span>
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<a name="l00075"></a>00075                 CleanupStack::Pop(); <span class="comment">// pop from clean-up stack</span>
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<a name="l00076"></a>00076                 <span class="keywordflow">return</span> <span class="keyword">self</span>; <span class="comment">// return new object</span>
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<a name="l00077"></a>00077                 };
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<a name="l00078"></a>00078         <span class="keyword">virtual</span> ~CTwoPhaser()
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<a name="l00079"></a>00079                 {
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<a name="l00080"></a>00080                 <span class="keyword">delete</span> iOnePhaser; <span class="comment">// just destroy anything we point to</span>
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<a name="l00081"></a>00081                 iTimer.Close(); <span class="comment">// close timer</span>
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<a name="l00082"></a>00082                 }
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<a name="l00083"></a>00083         <span class="comment">// other functions</span>
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<a name="l00084"></a>00084         <span class="keywordtype">void</span> Print()
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<a name="l00085"></a>00085                 {
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<a name="l00086"></a>00086                 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KFormat2,<span class="stringliteral">&quot;CTwoPhaser {TInt %d, TInt %d, RTimer, &quot;</span>);
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<a name="l00087"></a>00087                 console-&gt;Printf(KFormat2, iInt1, iInt2);
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<a name="l00088"></a>00088                 iOnePhaser-&gt;Print();
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<a name="l00089"></a>00089                 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KtxtCloseCurly,<span class="stringliteral">&quot;}&quot;</span>);
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<a name="l00090"></a>00090                 console-&gt;Printf(KtxtCloseCurly);
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   101
<a name="l00091"></a>00091                 }
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<a name="l00092"></a>00092 <span class="keyword">protected</span>: <span class="comment">// functions</span>
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<a name="l00093"></a>00093         <span class="comment">// construct support</span>
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<a name="l00094"></a>00094         <span class="keywordtype">void</span> ConstructL(TInt aInt1)
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<a name="l00095"></a>00095                 { <span class="comment">// do the work involved in construction</span>
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<a name="l00096"></a>00096                 iInt1=aInt1; <span class="comment">// assign iInt1 from argument</span>
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<a name="l00097"></a>00097                 User::LeaveIfError(iTimer.CreateLocal()); <span class="comment">// initialize timer</span>
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<a name="l00098"></a>00098                 iOnePhaser=COnePhaser::NewL(); <span class="comment">// make a new one-phaser</span>
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<a name="l00099"></a>00099                 }
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<a name="l00100"></a>00100         };
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<a name="l00101"></a>00101 
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<a name="l00102"></a>00102 <span class="comment">// abstract class derived from CBase</span>
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<a name="l00103"></a>00103 
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<a name="l00104"></a>00104 <span class="keyword">class </span>CAbstract : <span class="keyword">public</span> CBase
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<a name="l00105"></a>00105         {
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<a name="l00106"></a>00106 <span class="keyword">public</span>: <span class="comment">// data</span>
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<a name="l00107"></a>00107         CTwoPhaser* iTwoPhaser; <span class="comment">// a contained object</span>
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<a name="l00108"></a>00108 <span class="keyword">public</span>: <span class="comment">// functions</span>
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<a name="l00109"></a>00109         <span class="keywordtype">void</span> SomeFunction(TInt aInt)
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<a name="l00110"></a>00110                 { <span class="comment">// request some function</span>
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<a name="l00111"></a>00111                 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtbeginSomeFunction,<span class="stringliteral">&quot;beginning to do SomeFunction()\n&quot;</span>);
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<a name="l00112"></a>00112                 console-&gt;Printf(KTxtbeginSomeFunction);
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<a name="l00113"></a>00113                 DoSomeFunction(aInt); <span class="comment">// invoke virtual function</span>
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<a name="l00114"></a>00114                 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtfinishSomeFunction,<span class="stringliteral">&quot;finished doing SomeFunction()\n&quot;</span>);
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<a name="l00115"></a>00115                 console-&gt;Printf(KTxtfinishSomeFunction);
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<a name="l00116"></a>00116                 }
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<a name="l00117"></a>00117         <span class="keyword">virtual</span> ~CAbstract()
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<a name="l00118"></a>00118                 {
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<a name="l00119"></a>00119                 <span class="keyword">delete</span> iTwoPhaser;
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<a name="l00120"></a>00120                 }
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<a name="l00121"></a>00121 <span class="keyword">protected</span>:
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<a name="l00122"></a>00122         <span class="keyword">virtual</span> <span class="keywordtype">void</span> DoSomeFunction(TInt aInt) <span class="keyword">const</span> =0;
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<a name="l00123"></a>00123                 <span class="comment">// implement heart of some function, in derived class</span>
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<a name="l00124"></a>00124         <span class="keywordtype">void</span> ConstructL(TInt aInt)
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<a name="l00125"></a>00125                 { <span class="comment">// second phase of constructor</span>
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<a name="l00126"></a>00126                 iTwoPhaser=CTwoPhaser::NewL(aInt);
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<a name="l00127"></a>00127                         <span class="comment">// construct embedded object</span>
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<a name="l00128"></a>00128                 }
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<a name="l00129"></a>00129         };
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<a name="l00130"></a>00130 
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<a name="l00131"></a>00131 <span class="comment">// class derived from above</span>
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<a name="l00132"></a>00132 
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<a name="l00133"></a>00133 <span class="keyword">class </span>CConcrete : <span class="keyword">public</span> CAbstract
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<a name="l00134"></a>00134         {
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<a name="l00135"></a>00135 <span class="keyword">public</span>: <span class="comment">// data</span>
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<a name="l00136"></a>00136         COnePhaser* iOnePhaser; <span class="comment">// some extra data</span>
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<a name="l00137"></a>00137 <span class="keyword">public</span>: <span class="comment">// functions</span>
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<a name="l00138"></a>00138         <span class="comment">// construct/destruct</span>
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<a name="l00139"></a>00139         <span class="keyword">static</span> CConcrete* NewLC(TInt aInt)
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<a name="l00140"></a>00140                 { <span class="comment">// construct and leave on the clean-up stack</span>
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<a name="l00141"></a>00141                 CConcrete* <span class="keyword">self</span>=<span class="keyword">new</span> (ELeave) CConcrete; <span class="comment">// new object, C++ constructor</span>
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<a name="l00142"></a>00142                 CleanupStack::PushL(<span class="keyword">self</span>); <span class="comment">// push to clean-up stack</span>
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<a name="l00143"></a>00143                 <span class="keyword">self</span>-&gt;ConstructL(aInt); <span class="comment">// CBase constructor</span>
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<a name="l00144"></a>00144                 <span class="keywordflow">return</span> <span class="keyword">self</span>; <span class="comment">// return new object</span>
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<a name="l00145"></a>00145                 };
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<a name="l00146"></a>00146         <span class="keyword">static</span> CConcrete* NewL(TInt aInt)
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<a name="l00147"></a>00147                 { <span class="comment">// construct and don&#39;t leave on clean-up stack</span>
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<a name="l00148"></a>00148                 CConcrete* <span class="keyword">self</span>=CConcrete::NewLC(aInt); <span class="comment">// construct and leave on clean-up stack</span>
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<a name="l00149"></a>00149                 CleanupStack::Pop(); <span class="comment">// pop from clean-up stack</span>
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<a name="l00150"></a>00150                 <span class="keywordflow">return</span> <span class="keyword">self</span>; <span class="comment">// return new object</span>
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<a name="l00151"></a>00151                 };
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<a name="l00152"></a>00152         <span class="keyword">virtual</span> ~CConcrete()
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<a name="l00153"></a>00153                 {
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<a name="l00154"></a>00154                 <span class="keyword">delete</span> iOnePhaser; <span class="comment">// destroy member</span>
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<a name="l00155"></a>00155                 }
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<a name="l00156"></a>00156         <span class="comment">// protocol</span>
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<a name="l00157"></a>00157         <span class="keyword">virtual</span> <span class="keywordtype">void</span> DoSomeFunction(TInt aInt)<span class="keyword"> const</span>
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<a name="l00158"></a>00158 <span class="keyword">                </span>{ <span class="comment">// implementation of base class&#39;s pure-virtual function</span>
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<a name="l00159"></a>00159                 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KFormat3,<span class="stringliteral">&quot;CConcrete::DoSomething(%d)\n&quot;</span>);
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<a name="l00160"></a>00160                 console-&gt;Printf(KFormat3, aInt);
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<a name="l00161"></a>00161                 }
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<a name="l00162"></a>00162 <span class="keyword">protected</span>:
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<a name="l00163"></a>00163         <span class="comment">// construct/destruct</span>
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<a name="l00164"></a>00164         <span class="keywordtype">void</span> ConstructL(TInt aInt)
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<a name="l00165"></a>00165                 { <span class="comment">// second phase of construction</span>
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<a name="l00166"></a>00166                 CAbstract::ConstructL(aInt); <span class="comment">// base class constructor</span>
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<a name="l00167"></a>00167                 iOnePhaser=COnePhaser::NewL(); <span class="comment">// contained member constructor</span>
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<a name="l00168"></a>00168                 }
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<a name="l00169"></a>00169         };
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<a name="l00170"></a>00170 
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<a name="l00171"></a>00171 <span class="comment">// do the example</span>
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<a name="l00172"></a>00172 LOCAL_C <span class="keywordtype">void</span> doExampleL()
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<a name="l00173"></a>00173     {
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<a name="l00174"></a>00174         <span class="comment">// two-phase object</span>
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<a name="l00175"></a>00175         CTwoPhaser* twoPhaser=CTwoPhaser::NewLC(5);
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<a name="l00176"></a>00176                         <span class="comment">// new two-phase object</span>
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<a name="l00177"></a>00177         twoPhaser-&gt;Print(); <span class="comment">// print it</span>
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<a name="l00178"></a>00178         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtNewLine,<span class="stringliteral">&quot;\n&quot;</span>);
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<a name="l00179"></a>00179         console-&gt;Printf(KTxtNewLine);  <span class="comment">// with trailing new-line</span>
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<a name="l00180"></a>00180         CleanupStack::PopAndDestroy(); <span class="comment">// two-phase object</span>
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<a name="l00181"></a>00181         <span class="comment">// concrete instance of an abstract class</span>
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<a name="l00182"></a>00182         CAbstract* <span class="keyword">abstract</span>=CConcrete::NewLC(9);
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<a name="l00183"></a>00183                 <span class="comment">// new concrete object, but refer to it with abstract pointer</span>
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<a name="l00184"></a>00184         <span class="keyword">abstract</span>-&gt;SomeFunction(11); <span class="comment">// do something with it</span>
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<a name="l00185"></a>00185         CleanupStack::PopAndDestroy(); <span class="comment">// abstract object</span>
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<a name="l00186"></a>00186         }
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</pre></div></div>
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<hr size="1"/><address style="text-align: right;"><small>Generated by&nbsp;
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address>
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