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Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_range_checking_8cpp_source.html
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
changeset 14 578be2adaf3e
parent 6 43e37759235e
permissions -rw-r--r--
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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/Base/ArraysAndLists/FixedArrays/RangeChecking.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/Base/ArraysAndLists/FixedArrays/RangeChecking.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">// Code to demonstrate the range checking wrapper class</span>
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<a name="l00015"></a>00015 <span class="comment">// for C++ arrays; i.e. the TFixedArray&lt;class T,TInt S&gt;.</span>
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<a name="l00016"></a>00016 <span class="comment">//</span>
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<a name="l00017"></a>00017
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<a name="l00018"></a>00018 <span class="preprocessor">#include &quot;CommonFramework.h&quot;</span>
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<a name="l00019"></a>00019
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<a name="l00020"></a>00020 <span class="comment">//</span>
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<a name="l00021"></a>00021 <span class="comment">// Definition of the TTest class</span>
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<a name="l00022"></a>00022 <span class="comment">//</span>
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<a name="l00023"></a>00023 <span class="keyword">class </span>TTest
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<a name="l00024"></a>00024         {
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<a name="l00025"></a>00025 <span class="keyword">public</span>:
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<a name="l00026"></a>00026         TTest();
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<a name="l00027"></a>00027         TTest(TInt aValue);
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<a name="l00028"></a>00028         <span class="keywordtype">void</span> SetValue(TInt aValue);
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<a name="l00029"></a>00029         TInt GetValue() <span class="keyword">const</span>;
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<a name="l00030"></a>00030 <span class="keyword">private</span> :
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<a name="l00031"></a>00031         TInt     iX;
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<a name="l00032"></a>00032         TBuf&lt;8&gt;  iPadding; <span class="comment">// never used in this example</span>
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<a name="l00033"></a>00033         };
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<a name="l00034"></a>00034
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<a name="l00035"></a>00035 TTest::TTest()
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<a name="l00036"></a>00036         : iX(1)
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<a name="l00037"></a>00037         {}
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<a name="l00038"></a>00038
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<a name="l00039"></a>00039 TTest::TTest(TInt aValue)
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<a name="l00040"></a>00040         : iX(aValue)
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<a name="l00041"></a>00041         {}
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<a name="l00042"></a>00042
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<a name="l00043"></a>00043 TInt TTest::GetValue()<span class="keyword"> const</span>
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<a name="l00044"></a>00044 <span class="keyword">        </span>{
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<a name="l00045"></a>00045         <span class="keywordflow">return</span> iX;
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<a name="l00046"></a>00046         }
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<a name="l00047"></a>00047
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<a name="l00048"></a>00048 <span class="keywordtype">void</span> TTest::SetValue(TInt aValue)
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<a name="l00049"></a>00049         {
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<a name="l00050"></a>00050         iX = aValue;
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<a name="l00051"></a>00051         }
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<a name="l00052"></a>00052
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<a name="l00053"></a>00053 <span class="comment">//</span>
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<a name="l00054"></a>00054 <span class="comment">// Definition of the CTest class</span>
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<a name="l00055"></a>00055 <span class="comment">//</span>
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<a name="l00056"></a>00056 <span class="keyword">class </span>CTest : <span class="keyword">public</span> CBase
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<a name="l00057"></a>00057         {
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<a name="l00058"></a>00058 <span class="keyword">public</span>:
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<a name="l00059"></a>00059         <span class="keyword">static</span> CTest* NewL(<span class="keyword">const</span> TDesC&amp; aText);
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<a name="l00060"></a>00060         ~CTest();
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<a name="l00061"></a>00061         <span class="keywordtype">void</span> ConstructL(<span class="keyword">const</span> TDesC&amp; aText);
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<a name="l00062"></a>00062 <span class="keyword">private</span> :
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<a name="l00063"></a>00063         HBufC*   iSomeText;
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<a name="l00064"></a>00064         };
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<a name="l00065"></a>00065
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<a name="l00066"></a>00066 CTest* CTest::NewL(<span class="keyword">const</span> TDesC&amp; aText)
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<a name="l00067"></a>00067         {
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<a name="l00068"></a>00068         CTest* <span class="keyword">self</span>=<span class="keyword">new</span> (ELeave) CTest;
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<a name="l00069"></a>00069         CleanupStack::PushL(<span class="keyword">self</span>);
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<a name="l00070"></a>00070         <span class="keyword">self</span>-&gt;ConstructL(aText);
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<a name="l00071"></a>00071         CleanupStack::Pop();
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<a name="l00072"></a>00072         <span class="keywordflow">return</span> <span class="keyword">self</span>;
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<a name="l00073"></a>00073         }
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<a name="l00074"></a>00074
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<a name="l00075"></a>00075 <span class="keywordtype">void</span> CTest::ConstructL(<span class="keyword">const</span> TDesC&amp; aText)
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<a name="l00076"></a>00076         {
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<a name="l00077"></a>00077         iSomeText = aText.AllocL();
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<a name="l00078"></a>00078         }
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<a name="l00079"></a>00079
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<a name="l00080"></a>00080 CTest::~CTest()
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<a name="l00081"></a>00081         {
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<a name="l00082"></a>00082         <span class="keyword">delete</span> iSomeText;
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<a name="l00083"></a>00083         }
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<a name="l00087"></a>00087 <span class="comment">// Some source data</span>
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<a name="l00088"></a>00088 <span class="keyword">const</span> TTest data[] = {TTest(1),TTest(2),TTest(3),TTest(4)};
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<a name="l00089"></a>00089
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<a name="l00090"></a>00090 <span class="comment">//</span>
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<a name="l00091"></a>00091 <span class="comment">// main body of the example</span>
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<a name="l00092"></a>00092 <span class="comment">//</span>
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<a name="l00093"></a>00093 <span class="keyword">static</span> <span class="keywordtype">void</span> doExampleL()
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<a name="l00094"></a>00094     {
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<a name="l00095"></a>00095
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<a name="l00096"></a>00096         <span class="comment">// A C++ array of 4 elements of type class TTest.</span>
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<a name="l00097"></a>00097         <span class="comment">//</span>
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   108
 
<a name="l00098"></a>00098         <span class="comment">// Effectively the same as if we had explicitly</span>
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   109
 
<a name="l00099"></a>00099         <span class="comment">// declared: TTest array[4];</span>
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   110
 
<a name="l00100"></a>00100         <span class="comment">//</span>
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   111
 
<a name="l00101"></a>00101         TFixedArray&lt;TTest,4&gt; array;
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diff changeset 
   112
 
<a name="l00102"></a>00102
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diff changeset 
   113
 
<a name="l00103"></a>00103
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diff changeset 
   114
 
<a name="l00104"></a>00104         <span class="comment">//</span>
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   115
 
<a name="l00105"></a>00105         <span class="comment">// Copy 4 elements into the array.</span>
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   116
 
<a name="l00106"></a>00106         <span class="comment">//</span>
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   117
 
<a name="l00107"></a>00107         <span class="comment">// We could have constructed the array by:</span>
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   118
 
<a name="l00108"></a>00108         <span class="comment">// TFixedArray&lt;TTest,4&gt; array(&amp;data[0],4);</span>
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   119
 
<a name="l00109"></a>00109         array.Copy(&amp;data[0],4);
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   120
 
<a name="l00110"></a>00110
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   121
 
<a name="l00111"></a>00111         <span class="comment">//</span>
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   122
 
<a name="l00112"></a>00112         <span class="comment">// Trying to execute the following call would result</span>
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   123
 
<a name="l00113"></a>00113         <span class="comment">// in a USER 133 panic in a debug build. The range checking</span>
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   124
 
<a name="l00114"></a>00114         <span class="comment">// stops us from trying to write to a 5th element which </span>
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   125
 
<a name="l00115"></a>00115         <span class="comment">// does not (legitimately) exist.</span>
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   126
 
<a name="l00116"></a>00116         <span class="comment">//</span>
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   127
 
<a name="l00117"></a>00117         <span class="comment">//array.Copy(&amp;array[0],5);</span>
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   128
 
<a name="l00118"></a>00118
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   129
 
<a name="l00119"></a>00119         <span class="comment">//</span>
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   130
 
<a name="l00120"></a>00120         <span class="comment">// Count() should return the number of array elements, i.e. 4</span>
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   131
 
<a name="l00121"></a>00121         <span class="comment">//</span>
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   132
 
<a name="l00122"></a>00122         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtFormat1,<span class="stringliteral">&quot;Array size is %d\n&quot;</span>);
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   133
 
<a name="l00123"></a>00123         console-&gt;Printf(KTxtFormat1,array.Count());
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diff changeset 
   134
 
<a name="l00124"></a>00124
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diff changeset 
   135
 
<a name="l00125"></a>00125         <span class="comment">//</span>
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   136
 
<a name="l00126"></a>00126         <span class="comment">// Length() should return the size of an array element; here</span>
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   137
 
<a name="l00127"></a>00127         <span class="comment">// that should be the size of a TTest object.</span>
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   138
 
<a name="l00128"></a>00128         <span class="comment">//</span>
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   139
 
<a name="l00129"></a>00129         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtFormat2,<span class="stringliteral">&quot;Length of an array element is %d\n\n&quot;</span>);
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diff changeset 
   140
 
<a name="l00130"></a>00130         console-&gt;Printf(KTxtFormat2,array.Length());
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diff changeset 
   141
 
<a name="l00131"></a>00131
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diff changeset 
   142
 
<a name="l00132"></a>00132         <span class="comment">//</span>
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   143
 
<a name="l00133"></a>00133         <span class="comment">// Pointers to the beginning and end of the array</span>
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   144
 
<a name="l00134"></a>00134         <span class="comment">//</span>
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   145
 
<a name="l00135"></a>00135         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtFormat3,<span class="stringliteral">&quot;Array ends   at ---&gt; 0x%x\n      starts at ---&gt; 0x%x\n&quot;</span>);
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diff changeset 
   146
 
<a name="l00136"></a>00136         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtFormat4,<span class="stringliteral">&quot;Difference is decimal %d bytes (hopefully 4 times the size of TTest)\n\n&quot;</span>);
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diff changeset 
   147
 
<a name="l00137"></a>00137         console-&gt;Printf(KTxtFormat3,array.End(),array.Begin());
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   148
 
<a name="l00138"></a>00138         console-&gt;Printf(KTxtFormat4,((TUint8*)array.End() - (TUint8*)array.Begin()));
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diff changeset 
   149
 
<a name="l00139"></a>00139
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diff changeset 
   150
 
<a name="l00140"></a>00140         <span class="comment">//</span>
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diff changeset 
   151
 
<a name="l00141"></a>00141         <span class="comment">// Access the second element of the array and change it</span>
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   152
 
<a name="l00142"></a>00142         <span class="comment">// using At().</span>
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   153
 
<a name="l00143"></a>00143         <span class="comment">//</span>
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   154
 
<a name="l00144"></a>00144         array.At(1).SetValue(100);
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diff changeset 
   155
 
<a name="l00145"></a>00145
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diff changeset 
   156
 
<a name="l00146"></a>00146         <span class="comment">//</span>
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diff changeset 
   157
 
<a name="l00147"></a>00147         <span class="comment">// Access the second element of the array and change it</span>
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diff changeset 
   158
 
<a name="l00148"></a>00148         <span class="comment">// using the [] operator.</span>
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diff changeset 
   159
 
<a name="l00149"></a>00149         <span class="comment">//</span>
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diff changeset 
   160
 
<a name="l00150"></a>00150         array[1].SetValue(99);
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diff changeset 
   161
 
<a name="l00151"></a>00151
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diff changeset 
   162
 
<a name="l00152"></a>00152         <span class="comment">// The following call using At() will panic in both a</span>
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diff changeset 
   163
 
<a name="l00153"></a>00153         <span class="comment">// release and a debug build.</span>
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   164
 
<a name="l00154"></a>00154         <span class="comment">//array.At(4).SetValue(100);</span>
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diff changeset 
   165
 
<a name="l00155"></a>00155
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diff changeset 
   166
 
<a name="l00156"></a>00156         <span class="comment">// The following call using the [] operator will only panic</span>
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diff changeset 
   167
 
<a name="l00157"></a>00157         <span class="comment">// in a debug build. In a release build, this  code</span>
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diff changeset 
   168
 
<a name="l00158"></a>00158         <span class="comment">// will go undetected and cause damage.</span>
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diff changeset 
   169
 
<a name="l00159"></a>00159         <span class="comment">//array[4].SetValue(99);</span>
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diff changeset 
   170
 
<a name="l00160"></a>00160
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diff changeset 
   171
 
<a name="l00161"></a>00161         <span class="comment">// In this example we can also replace an entire element;</span>
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diff changeset 
   172
 
<a name="l00162"></a>00162         <span class="comment">// here we replace the third element.</span>
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diff changeset 
   173
 
<a name="l00163"></a>00163         <span class="comment">// In more complex cases, the TTest class could have </span>
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diff changeset 
   174
 
<a name="l00164"></a>00164         <span class="comment">// a suitable operator= defined </span>
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diff changeset 
   175
 
<a name="l00165"></a>00165         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtFormat5,<span class="stringliteral">&quot;The new 3rd element has value %d\n\n&quot;</span>);
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   176
 
<a name="l00166"></a>00166         TTest x(256);
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   177
 
<a name="l00167"></a>00167         array.At(2) = x;
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   178
 
<a name="l00168"></a>00168         console-&gt;Printf(KTxtFormat5,array.At(2).GetValue());
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diff changeset 
   179
 
<a name="l00169"></a>00169
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diff changeset 
   180
 
<a name="l00170"></a>00170         <span class="comment">//</span>
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   181
 
<a name="l00171"></a>00171         <span class="comment">// Construct a generic array.</span>
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diff changeset 
   182
 
<a name="l00172"></a>00172         <span class="comment">//</span>
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diff changeset 
   183
 
<a name="l00173"></a>00173         <span class="comment">// Once done, we can use the standard TArray functions</span>
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diff changeset 
   184
 
<a name="l00174"></a>00174         <span class="comment">// Count() and operator[]</span>
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   185
 
<a name="l00175"></a>00175         <span class="comment">// Remember that a TArray cannot be used to change data in the</span>
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diff changeset 
   186
 
<a name="l00176"></a>00176         <span class="comment">// original array.</span>
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diff changeset 
   187
 
<a name="l00177"></a>00177         <span class="comment">//</span>
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diff changeset 
   188
 
<a name="l00178"></a>00178         TArray&lt;TTest&gt; <span class="keyword">generic</span> = array.Array();
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diff changeset 
   189
 
<a name="l00179"></a>00179
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diff changeset 
   190
 
<a name="l00180"></a>00180         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtFormat6,<span class="stringliteral">&quot;Array size as reported by TArray&#39;s Count() is %d\n\n&quot;</span>);
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diff changeset 
   191
 
<a name="l00181"></a>00181         console-&gt;Printf(KTxtFormat6,<span class="keyword">generic</span>.Count());
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diff changeset 
   192
 
<a name="l00182"></a>00182
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diff changeset 
   193
 
<a name="l00183"></a>00183         <span class="comment">// The value contained in the 2nd TTest element of the array</span>
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diff changeset 
   194
 
<a name="l00184"></a>00184         <span class="comment">// using the generic array&#39;s operator[]</span>
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diff changeset 
   195
 
<a name="l00185"></a>00185         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtFormat7,<span class="stringliteral">&quot;Value contained in the 2nd TTest element of\nthe array using TArray&#39;s operator[] is %d\n\n&quot;</span>);
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diff changeset 
   196
 
<a name="l00186"></a>00186         console-&gt;Printf(KTxtFormat7,<span class="keyword">generic</span>[1].GetValue());
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diff changeset 
   197
 
<a name="l00187"></a>00187
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diff changeset 
   198
 
<a name="l00188"></a>00188         <span class="comment">// the following line will NOT compile</span>
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   199
 
<a name="l00189"></a>00189         <span class="comment">//generic[1].SetValue(101);</span>
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diff changeset 
   200
 
<a name="l00190"></a>00190
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diff changeset 
   201
 
<a name="l00191"></a>00191
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diff changeset 
   202
 
<a name="l00192"></a>00192         <span class="comment">// This is A C++ array of 4 elements to contain</span>
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diff changeset 
   203
 
<a name="l00193"></a>00193         <span class="comment">// pointers to CTest type objects.</span>
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   204
 
<a name="l00194"></a>00194         <span class="comment">// This is equivalent to</span>
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   205
 
<a name="l00195"></a>00195         <span class="comment">// the naked declaration:</span>
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   206
 
<a name="l00196"></a>00196         <span class="comment">// CTest* ptrarray[4];</span>
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<a name="l00197"></a>00197         <span class="comment">// </span>
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<a name="l00198"></a>00198         <span class="comment">//</span>
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<a name="l00199"></a>00199         TFixedArray&lt;CTest*,4&gt; ptrarray;
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<a name="l00200"></a>00200
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<a name="l00201"></a>00201
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<a name="l00202"></a>00202         <span class="comment">// Allocate 4 CTest objects and put their pointers</span>
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<a name="l00203"></a>00203         <span class="comment">// into the array.</span>
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<a name="l00204"></a>00204         <span class="comment">//</span>
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<a name="l00205"></a>00205         <span class="comment">// We ignore cleanup issues arising from possible</span>
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<a name="l00206"></a>00206         <span class="comment">// failure of &#39;new&#39;; this would need to be</span>
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<a name="l00207"></a>00207         <span class="comment">// considered in a real application.</span>
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<a name="l00208"></a>00208
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<a name="l00209"></a>00209         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtDefault,<span class="stringliteral">&quot;Default text&quot;</span>);
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<a name="l00210"></a>00210         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtState1,<span class="stringliteral">&quot;The 4 elements are:     &quot;</span>);
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<a name="l00211"></a>00211         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtState2,<span class="stringliteral">&quot;After Reset() they are: &quot;</span>);
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<a name="l00212"></a>00212         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtNewLine,<span class="stringliteral">&quot;\n&quot;</span>);
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<a name="l00213"></a>00213         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTxtFormat8,<span class="stringliteral">&quot;0x%08x &quot;</span>);
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<a name="l00214"></a>00214
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<a name="l00215"></a>00215         CTest* ptr;
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<a name="l00216"></a>00216         TInt   ix;
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<a name="l00217"></a>00217         <span class="keywordflow">for</span> (ix = 0; ix&lt;4; ix++)
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<a name="l00218"></a>00218                 {
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<a name="l00219"></a>00219                 ptr = CTest::NewL(KTxtDefault);
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<a name="l00220"></a>00220                 ptrarray.At(ix) = ptr;
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<a name="l00221"></a>00221                 }
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<a name="l00222"></a>00222
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<a name="l00223"></a>00223         console-&gt;Printf(KTxtState1);
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<a name="l00224"></a>00224         <span class="keywordflow">for</span> (ix = 0; ix&lt;4; ix++)
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<a name="l00225"></a>00225                 {
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<a name="l00226"></a>00226                 console-&gt;Printf(KTxtFormat8,ptrarray[ix]);
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<a name="l00227"></a>00227                 }
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<a name="l00228"></a>00228         console-&gt;Printf(KTxtNewLine);
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<a name="l00229"></a>00229
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<a name="l00230"></a>00230         <span class="comment">// Now delete all the CTest objects</span>
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<a name="l00231"></a>00231         ptrarray.DeleteAll();
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<a name="l00232"></a>00232
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<a name="l00233"></a>00233         <span class="comment">// Set the array&#39;s data members to NULL </span>
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<a name="l00234"></a>00234         ptrarray.Reset();
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<a name="l00235"></a>00235
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<a name="l00236"></a>00236         console-&gt;Printf(KTxtState2);
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<a name="l00237"></a>00237         <span class="keywordflow">for</span> (ix = 0; ix&lt;4; ix++)
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<a name="l00238"></a>00238                 {
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<a name="l00239"></a>00239                 console-&gt;Printf(KTxtFormat8,ptrarray[ix]);
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<a name="l00240"></a>00240                 }
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<a name="l00241"></a>00241         console-&gt;Printf(KTxtNewLine);
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<a name="l00242"></a>00242
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<a name="l00243"></a>00243         }
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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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<a href="http://www.doxygen.org/index.html">
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address>
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</body>
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</html>
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