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Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_m_classes2_8cpp-source.html
author Dominic Pinkman <Dominic.Pinkman@Nokia.com>
Tue, 30 Mar 2010 11:42:04 +0100
changeset 4 4816d766a08a
parent 1 25a17d01db0c
permissions -rw-r--r--
Week 12 contribution of SDK documentation_content. See release notes for details. Fixes Bug 1892, Bug 1522, Bug 1520, Bug 394, Bug 1319, Bug 344, Bug 1897
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
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<title>TB10.1 Example Applications: examples/Basics/MClasses2/MClasses2.cpp Source File</title>
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<link href="doxygen.css" rel="stylesheet" type="text/css">
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<link href="tabs.css" rel="stylesheet" type="text/css">
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</head><body>
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<!-- Generated by Doxygen 1.5.3 -->
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<h1>examples/Basics/MClasses2/MClasses2.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 "Eclipse Public License v1.0"</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 "http://www.eclipse.org/legal/epl-v10.html".</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">// Demonstrate use of M classes, or mixins - the</span>
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<a name="l00015"></a>00015 <span class="comment">// only use of multiple inheritance that has been</span>
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<a name="l00016"></a>00016 <span class="comment">// sanctioned by the E32 architecture team</span>
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<a name="l00017"></a>00017 <span class="comment">// This example shows how mixins can be used to</span>
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<a name="l00018"></a>00018 <span class="comment">// pass some protocol, and an associated object, from</span>
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<a name="l00019"></a>00019 <span class="comment">// a protocol provider to an protocol user.  The user</span>
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<a name="l00020"></a>00020 <span class="comment">// is not supposed to know everything about the provider,</span>
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<a name="l00021"></a>00021 <span class="comment">// only about the protocol it's interested in.</span>
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<a name="l00022"></a>00022 <span class="comment">// In this specific example, the provider contains a pointer </span>
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<a name="l00023"></a>00023 <span class="comment">// to the _real provider_: the provider is derived</span>
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<a name="l00024"></a>00024 <span class="comment">// from the protocol base class, but the real provider is not.</span>
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<a name="l00025"></a>00025 <span class="comment">// The real provider may thus honour many protocols.</span>
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<a name="l00026"></a>00026 <span class="comment">//</span>
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<a name="l00027"></a>00027
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<a name="l00028"></a>00028
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<a name="l00029"></a>00029
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<a name="l00030"></a>00030 <span class="preprocessor">#include "CommonFramework.h"</span>
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<a name="l00031"></a>00031
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<a name="l00033"></a>00033 <span class="comment">//</span>
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<a name="l00034"></a>00034 <span class="comment">// -----&gt; CProtocol (definition)</span>
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<a name="l00035"></a>00035 <span class="comment">//</span>
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<a name="l00036"></a>00036 <span class="comment">// A protocol class for mixing in</span>
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<a name="l00037"></a>00037 <span class="comment">//</span>
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<a name="l00039"></a>00039 <span class="comment"></span><span class="keyword">class </span>TProtocol
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<a name="l00040"></a>00040         {
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<a name="l00041"></a>00041 <span class="keyword">public</span>:
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<a name="l00042"></a>00042         <span class="keyword">virtual</span> <span class="keywordtype">void</span> HandleEvent(TInt aEventCode)=0;
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<a name="l00043"></a>00043         };
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<a name="l00044"></a>00044
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<a name="l00045"></a>00045
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<a name="l00047"></a>00047 <span class="comment">//</span>
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<a name="l00048"></a>00048 <span class="comment">// -----&gt; CProtocolUser (definition)</span>
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<a name="l00049"></a>00049 <span class="comment">//</span>
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<a name="l00050"></a>00050 <span class="comment">// Define a protocol user which uses this protocol</span>
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<a name="l00051"></a>00051 <span class="comment">//</span>
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<a name="l00053"></a>00053 <span class="comment"></span><span class="keyword">class </span>CProtocolUser : <span class="keyword">public</span> CBase
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<a name="l00054"></a>00054         {
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<a name="l00055"></a>00055 <span class="keyword">public</span>:
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<a name="l00056"></a>00056           <span class="comment">// Construction</span>
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<a name="l00057"></a>00057         <span class="keyword">static</span> CProtocolUser* NewLC();
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<a name="l00058"></a>00058         <span class="keyword">static</span> CProtocolUser* NewL();
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<a name="l00059"></a>00059
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<a name="l00060"></a>00060           <span class="comment">// Destruction</span>
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<a name="l00061"></a>00061         ~CProtocolUser();
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<a name="l00062"></a>00062
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<a name="l00063"></a>00063           <span class="comment">// Some function which uses a protocol</span>
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<a name="l00064"></a>00064         <span class="keywordtype">void</span> DoSomething(TProtocol* aProtocol);
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<a name="l00065"></a>00065
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<a name="l00066"></a>00066 <span class="keyword">protected</span>:
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<a name="l00067"></a>00067           <span class="comment">// Construction assistance</span>
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<a name="l00068"></a>00068         <span class="keywordtype">void</span> ConstructL();
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<a name="l00069"></a>00069         };
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<a name="l00070"></a>00070
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<a name="l00071"></a>00071
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<a name="l00073"></a>00073 <span class="comment">//</span>
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<a name="l00074"></a>00074 <span class="comment">// -----&gt; CProtocolProvider (definition)</span>
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<a name="l00075"></a>00075 <span class="comment">//</span>
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<a name="l00076"></a>00076 <span class="comment">// A simple class which uses the mixin</span>
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<a name="l00077"></a>00077 <span class="comment">//</span>
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<a name="l00079"></a>00079 <span class="comment"></span><span class="keyword">class </span>TProtocolProvider;
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<a name="l00080"></a>00080 <span class="keyword">class </span>CProtocolProvider : <span class="keyword">public</span> CBase
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<a name="l00081"></a>00081         {
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<a name="l00082"></a>00082 <span class="keyword">public</span>:
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    84
 
<a name="l00083"></a>00083           <span class="comment">// Construction</span>
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    85
 
<a name="l00084"></a>00084         <span class="keyword">static</span> CProtocolProvider* NewLC();
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    86
 
<a name="l00085"></a>00085
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    87
 
<a name="l00086"></a>00086           <span class="comment">// Destruction</span>
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    88
 
<a name="l00087"></a>00087         ~CProtocolProvider();
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    89
 
<a name="l00088"></a>00088
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    90
 
<a name="l00089"></a>00089           <span class="comment">// Calls the protocol user</span>
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    91
 
<a name="l00090"></a>00090         <span class="keywordtype">void</span> CallProtocolUser();
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    92
 
<a name="l00091"></a>00091
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    93
 
<a name="l00092"></a>00092           <span class="comment">// Implement the protocol (handles the protocol)</span>
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    94
 
<a name="l00093"></a>00093         <span class="keywordtype">void</span> HandleEvent(TInt aEventCode);
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    95
 
<a name="l00094"></a>00094
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    96
 
<a name="l00095"></a>00095 <span class="keyword">protected</span>:
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    97
 
<a name="l00096"></a>00096           <span class="comment">// Construction assistance</span>
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    98
 
<a name="l00097"></a>00097         <span class="keywordtype">void</span> ConstructL();
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    99
 
<a name="l00098"></a>00098
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   100
 
<a name="l00099"></a>00099 <span class="keyword">private</span>:
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   101
 
<a name="l00100"></a>00100           <span class="comment">// data members defined by this class</span>
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   102
 
<a name="l00101"></a>00101         CProtocolUser*     iProtocolUser;
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   103
 
<a name="l00102"></a>00102         TProtocolProvider* iProviderProtocol;
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   104
 
<a name="l00103"></a>00103         };
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   105
 
<a name="l00104"></a>00104
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   106
 
<a name="l00105"></a>00105
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   107
 
<a name="l00107"></a>00107 <span class="comment">//</span>
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   108
 
<a name="l00108"></a>00108 <span class="comment">// -----&gt; TProtocolProvider (definition)</span>
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   109
 
<a name="l00109"></a>00109 <span class="comment">//</span>
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   110
 
<a name="l00110"></a>00110 <span class="comment">// Define protocol implementation which passes on the implementation</span>
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   111
 
<a name="l00111"></a>00111 <span class="comment">// to a real protocol provider</span>
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   112
 
<a name="l00112"></a>00112 <span class="comment">//</span>
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   113
 
<a name="l00114"></a>00114 <span class="comment"></span><span class="keyword">class </span>TProtocolProvider : <span class="keyword">public</span> TProtocol
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   114
 
<a name="l00115"></a>00115         {
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   115
 
<a name="l00116"></a>00116 <span class="keyword">public</span>:
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   116
 
<a name="l00117"></a>00117           <span class="comment">// Construction</span>
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   117
 
<a name="l00118"></a>00118         TProtocolProvider(CProtocolProvider* aProvider);
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   118
 
<a name="l00119"></a>00119
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   119
 
<a name="l00120"></a>00120           <span class="comment">// The protocol itself</span>
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   120
 
<a name="l00121"></a>00121         <span class="keywordtype">void</span> HandleEvent(TInt aEventCode);
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   121
 
<a name="l00122"></a>00122
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   122
 
<a name="l00123"></a>00123 <span class="keyword">private</span>:
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   123
 
<a name="l00124"></a>00124           <span class="comment">// The real provider</span>
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   124
 
<a name="l00125"></a>00125         CProtocolProvider* iProvider;
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   125
 
<a name="l00126"></a>00126         };
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   126
 
<a name="l00127"></a>00127
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   127
 
<a name="l00128"></a>00128
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   128
 
<a name="l00130"></a>00130 <span class="comment">//</span>
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   129
 
<a name="l00131"></a>00131 <span class="comment">// -----&gt; CProtocolUser (implementation)</span>
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   130
 
<a name="l00132"></a>00132 <span class="comment">//</span>
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   131
 
<a name="l00134"></a>00134 <span class="comment"></span>CProtocolUser* CProtocolUser::NewLC()
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   132
 
<a name="l00135"></a>00135         {
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   133
 
<a name="l00136"></a>00136         CProtocolUser* <span class="keyword">self</span>=<span class="keyword">new</span>(ELeave) CProtocolUser;
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   134
 
<a name="l00137"></a>00137         CleanupStack::PushL(<span class="keyword">self</span>);
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   135
 
<a name="l00138"></a>00138         <span class="keyword">self</span>-&gt;ConstructL();
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   136
 
<a name="l00139"></a>00139         <span class="keywordflow">return</span> <span class="keyword">self</span>;
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   137
 
<a name="l00140"></a>00140         }
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   138
 
<a name="l00141"></a>00141
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   139
 
<a name="l00142"></a>00142 CProtocolUser* CProtocolUser::NewL()
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   140
 
<a name="l00143"></a>00143         {
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   141
 
<a name="l00144"></a>00144         CProtocolUser* <span class="keyword">self</span>=NewLC();
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   142
 
<a name="l00145"></a>00145         CleanupStack::Pop();
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   143
 
<a name="l00146"></a>00146         <span class="keywordflow">return</span> <span class="keyword">self</span>;
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   144
 
<a name="l00147"></a>00147         }
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   145
 
<a name="l00148"></a>00148
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   146
 
<a name="l00149"></a>00149 CProtocolUser::~CProtocolUser()
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   147
 
<a name="l00150"></a>00150         {
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   148
 
<a name="l00151"></a>00151         }
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   149
 
<a name="l00152"></a>00152
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   150
 
<a name="l00153"></a>00153 <span class="keywordtype">void</span> CProtocolUser::ConstructL()
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   151
 
<a name="l00154"></a>00154         {
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   152
 
<a name="l00155"></a>00155         }
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   153
 
<a name="l00156"></a>00156
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   154
 
<a name="l00157"></a>00157 <span class="keywordtype">void</span> CProtocolUser::DoSomething(TProtocol* aProtocol)
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   155
 
<a name="l00158"></a>00158         {
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   156
 
<a name="l00159"></a>00159           <span class="comment">// Do something that requires a protocol</span>
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   157
 
<a name="l00160"></a>00160         _LIT(KTxtExtSystemDoing,<span class="stringliteral">"External system doing something\n"</span>);
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   158
 
<a name="l00161"></a>00161         <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>-&gt;Printf(KTxtExtSystemDoing);
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   159
 
<a name="l00162"></a>00162         _LIT(KTxtInvokingProtocol,<span class="stringliteral">"invoking protocol - event 3\n"</span>);
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   160
 
<a name="l00163"></a>00163         <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>-&gt;Printf(KTxtInvokingProtocol);
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   161
 
<a name="l00164"></a>00164           <span class="comment">// Handle an event</span>
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   162
 
<a name="l00165"></a>00165         aProtocol-&gt;HandleEvent(3);
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   163
 
<a name="l00166"></a>00166         }
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   164
 
<a name="l00167"></a>00167
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   165
 
<a name="l00168"></a>00168
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   166
 
<a name="l00170"></a>00170 <span class="comment">//</span>
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   167
 
<a name="l00171"></a>00171 <span class="comment">// -----&gt; TProtocolProvider (implementation)</span>
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   168
 
<a name="l00172"></a>00172 <span class="comment">//</span>
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   169
 
<a name="l00174"></a>00174 <span class="comment"></span>TProtocolProvider::TProtocolProvider(CProtocolProvider* aProvider)
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   170
 
<a name="l00175"></a>00175                 : iProvider(aProvider)
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<a name="l00176"></a>00176         {
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<a name="l00177"></a>00177         }
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<a name="l00178"></a>00178
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<a name="l00179"></a>00179 <span class="comment">// see later for definition of HandleEvent()</span>
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<a name="l00180"></a>00180
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<a name="l00181"></a>00181
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<a name="l00183"></a>00183 <span class="comment">//</span>
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<a name="l00184"></a>00184 <span class="comment">// -----&gt; CProtocolProvider (implementation)</span>
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<a name="l00185"></a>00185 <span class="comment">//</span>
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<a name="l00187"></a>00187 <span class="comment"></span>CProtocolProvider* CProtocolProvider::NewLC()
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<a name="l00188"></a>00188         {
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<a name="l00189"></a>00189         CProtocolProvider* <span class="keyword">self</span>=<span class="keyword">new</span>(ELeave) CProtocolProvider;
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<a name="l00190"></a>00190         CleanupStack::PushL(<span class="keyword">self</span>);
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<a name="l00191"></a>00191         <span class="keyword">self</span>-&gt;ConstructL();
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<a name="l00192"></a>00192         <span class="keywordflow">return</span> <span class="keyword">self</span>;
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<a name="l00193"></a>00193         };
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<a name="l00194"></a>00194
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<a name="l00195"></a>00195 CProtocolProvider::~CProtocolProvider()
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<a name="l00196"></a>00196         {
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<a name="l00197"></a>00197         <span class="keyword">delete</span> iProtocolUser;
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<a name="l00198"></a>00198         <span class="keyword">delete</span> iProviderProtocol;
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<a name="l00199"></a>00199         }
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<a name="l00200"></a>00200
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<a name="l00201"></a>00201 <span class="keywordtype">void</span> CProtocolProvider::ConstructL()
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<a name="l00202"></a>00202         {
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<a name="l00203"></a>00203         iProtocolUser=CProtocolUser::NewL();
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<a name="l00204"></a>00204         iProviderProtocol=<span class="keyword">new</span>(ELeave) TProtocolProvider(<span class="keyword">this</span>);
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<a name="l00205"></a>00205         }
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<a name="l00206"></a>00206
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<a name="l00207"></a>00207 <span class="keywordtype">void</span> CProtocolProvider::CallProtocolUser()
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<a name="l00208"></a>00208         {
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<a name="l00209"></a>00209           <span class="comment">// Call the protocol user to do some work</span>
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<a name="l00210"></a>00210         _LIT(KTxtCallProtUser,<span class="stringliteral">"CProtocolProvider calling protocol user\n"</span>);
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<a name="l00211"></a>00211         <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>-&gt;Printf(KTxtCallProtUser);
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<a name="l00212"></a>00212         iProtocolUser-&gt;DoSomething(iProviderProtocol);
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<a name="l00213"></a>00213                         <span class="comment">// pass the intermediary, which implements the</span>
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<a name="l00214"></a>00214                         <span class="comment">// protocol by passing it on to us,</span>
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<a name="l00215"></a>00215                         <span class="comment">// to the protocol user</span>
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<a name="l00216"></a>00216         }
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<a name="l00217"></a>00217
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<a name="l00218"></a>00218 <span class="keywordtype">void</span> CProtocolProvider::HandleEvent(TInt aEventCode)
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<a name="l00219"></a>00219         {
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<a name="l00220"></a>00220           <span class="comment">// A concrete implementation of the abstract protocol.</span>
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<a name="l00221"></a>00221           <span class="comment">// Handle an event in the protocol user</span>
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<a name="l00222"></a>00222         _LIT(KFormat1,<span class="stringliteral">"CProtocolProvider handling event %d\n"</span>);
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<a name="l00223"></a>00223         <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>-&gt;Printf(KFormat1,aEventCode);
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<a name="l00224"></a>00224         }
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<a name="l00225"></a>00225
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<a name="l00226"></a>00226 <span class="keywordtype">void</span> TProtocolProvider::HandleEvent(TInt aEventCode)
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<a name="l00227"></a>00227         {
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<a name="l00228"></a>00228           <span class="comment">// A concrete definition of TProtocol::HandleEvent()</span>
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<a name="l00229"></a>00229         _LIT(KTxtHandling,<span class="stringliteral">"Handling through intermediary\n"</span>);
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<a name="l00230"></a>00230         <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>-&gt;Printf(KTxtHandling);
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<a name="l00231"></a>00231         iProvider-&gt;HandleEvent(aEventCode);
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<a name="l00232"></a>00232         }
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<a name="l00233"></a>00233
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<a name="l00234"></a>00234
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<a name="l00236"></a>00236 <span class="comment">//</span>
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<a name="l00237"></a>00237 <span class="comment">// Do the example</span>
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<a name="l00238"></a>00238 <span class="comment">//</span>
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<a name="l00240"></a>00240 <span class="comment"></span>LOCAL_C <span class="keywordtype">void</span> doExampleL()
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<a name="l00241"></a>00241     {
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<a name="l00242"></a>00242           <span class="comment">// show use of mixin with simple class</span>
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<a name="l00243"></a>00243         CProtocolProvider* simpleProvider=CProtocolProvider::NewLC();
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<a name="l00244"></a>00244           <span class="comment">// call protocol user</span>
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<a name="l00245"></a>00245         simpleProvider-&gt;CallProtocolUser();
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<a name="l00246"></a>00246           <span class="comment">// Remove simpleProvider from cleanup stack and destroy</span>
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<a name="l00247"></a>00247         CleanupStack::PopAndDestroy();
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<a name="l00248"></a>00248         }
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</pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Thu Jan 21 10:32:57 2010 for TB10.1 Example Applications by&nbsp;
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<a href="http://www.doxygen.org/index.html">
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<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.3 </small></address>
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</body>
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</html>
FCL/sftools/depl/docscontent