Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_m_classes1_8cpp-source.html
week 10 bug fix submission: Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
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<h1>examples/Basics/MClasses1/MClasses1.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>
<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span>
<a name="l00004"></a>00004 <span class="comment">// under the terms of "Eclipse Public License v1.0"</span>
<a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span>
<a name="l00006"></a>00006 <span class="comment">// at the URL "http://www.eclipse.org/legal/epl-v10.html".</span>
<a name="l00007"></a>00007 <span class="comment">//</span>
<a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span>
<a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span>
<a name="l00010"></a>00010 <span class="comment">//</span>
<a name="l00011"></a>00011 <span class="comment">// Contributors:</span>
<a name="l00012"></a>00012 <span class="comment">//</span>
<a name="l00013"></a>00013 <span class="comment">// Description:</span>
<a name="l00014"></a>00014 <span class="comment">// Demonstrate use of M classes, or mixins - the</span>
<a name="l00015"></a>00015 <span class="comment">// only use of multiple inheritance that has been</span>
<a name="l00016"></a>00016 <span class="comment">// sanctioned by the E32 architecture team</span>
<a name="l00017"></a>00017 <span class="comment">// This example shows how mixins can be used to</span>
<a name="l00018"></a>00018 <span class="comment">// pass some protocol, and an associated object, from</span>
<a name="l00019"></a>00019 <span class="comment">// a protocol provider to an protocol user. The user</span>
<a name="l00020"></a>00020 <span class="comment">// is not supposed to know everything about the provider,</span>
<a name="l00021"></a>00021 <span class="comment">// only about the protocol it's interested in.</span>
<a name="l00022"></a>00022 <span class="comment">// In this specific example, the provider is derived </span>
<a name="l00023"></a>00023 <span class="comment">// from a CProtocol class.</span>
<a name="l00024"></a>00024 <span class="comment">//</span>
<a name="l00025"></a>00025
<a name="l00026"></a>00026
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="preprocessor">#include "CommonFramework.h"</span>
<a name="l00029"></a>00029
<a name="l00031"></a>00031 <span class="comment">//</span>
<a name="l00032"></a>00032 <span class="comment">// -----> CProtocol (definition)</span>
<a name="l00033"></a>00033 <span class="comment">//</span>
<a name="l00034"></a>00034 <span class="comment">// A protocol class for mixing in</span>
<a name="l00035"></a>00035 <span class="comment">//</span>
<a name="l00037"></a>00037 <span class="comment"></span><span class="keyword">class </span>CProtocol : <span class="keyword">public</span> CBase
<a name="l00038"></a>00038 {
<a name="l00039"></a>00039 <span class="keyword">public</span>:
<a name="l00040"></a>00040 <span class="keyword">virtual</span> <span class="keywordtype">void</span> HandleEvent(TInt aEventCode)=0;
<a name="l00041"></a>00041 };
<a name="l00042"></a>00042
<a name="l00043"></a>00043
<a name="l00045"></a>00045 <span class="comment">//</span>
<a name="l00046"></a>00046 <span class="comment">// -----> CProtocolUser (definition)</span>
<a name="l00047"></a>00047 <span class="comment">//</span>
<a name="l00048"></a>00048 <span class="comment">// Define a protocol user which uses this protocol</span>
<a name="l00049"></a>00049 <span class="comment">//</span>
<a name="l00051"></a>00051 <span class="comment"></span><span class="keyword">class </span>CProtocolUser : <span class="keyword">public</span> CBase
<a name="l00052"></a>00052 {
<a name="l00053"></a>00053 <span class="keyword">public</span>:
<a name="l00054"></a>00054 <span class="comment">// Construction</span>
<a name="l00055"></a>00055 <span class="keyword">static</span> CProtocolUser* NewLC();
<a name="l00056"></a>00056 <span class="keyword">static</span> CProtocolUser* NewL();
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="comment">// Destruction</span>
<a name="l00059"></a>00059 ~CProtocolUser();
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="comment">// Some function which uses a protocol</span>
<a name="l00062"></a>00062 <span class="keywordtype">void</span> DoSomething(CProtocol* aProtocol);
<a name="l00063"></a>00063
<a name="l00064"></a>00064 <span class="keyword">protected</span>:
<a name="l00065"></a>00065 <span class="comment">// Construction assistance</span>
<a name="l00066"></a>00066 <span class="keywordtype">void</span> ConstructL();
<a name="l00067"></a>00067 };
<a name="l00068"></a>00068
<a name="l00069"></a>00069
<a name="l00071"></a>00071 <span class="comment">//</span>
<a name="l00072"></a>00072 <span class="comment">// -----> CProtocolProvider (definition)</span>
<a name="l00073"></a>00073 <span class="comment">//</span>
<a name="l00074"></a>00074 <span class="comment">// A simple class which uses the mixin</span>
<a name="l00075"></a>00075 <span class="comment">//</span>
<a name="l00077"></a>00077 <span class="comment"></span><span class="keyword">class </span>CProtocolProvider : <span class="keyword">public</span> CProtocol
<a name="l00078"></a>00078 {
<a name="l00079"></a>00079 <span class="keyword">public</span>:
<a name="l00080"></a>00080 <span class="comment">// Construction</span>
<a name="l00081"></a>00081 <span class="keyword">static</span> CProtocolProvider* NewLC();
<a name="l00082"></a>00082
<a name="l00083"></a>00083 <span class="comment">// Destruction</span>
<a name="l00084"></a>00084 ~CProtocolProvider();
<a name="l00085"></a>00085
<a name="l00086"></a>00086 <span class="comment">// Calls the protocol user</span>
<a name="l00087"></a>00087 <span class="keywordtype">void</span> CallProtocolUser();
<a name="l00088"></a>00088
<a name="l00089"></a>00089 <span class="comment">// Implement the protocol (handles the protocol)</span>
<a name="l00090"></a>00090 <span class="keywordtype">void</span> HandleEvent(TInt aEventCode);
<a name="l00091"></a>00091
<a name="l00092"></a>00092 <span class="keyword">protected</span>:
<a name="l00093"></a>00093 <span class="comment">// Construction assistance</span>
<a name="l00094"></a>00094 <span class="keywordtype">void</span> ConstructL();
<a name="l00095"></a>00095
<a name="l00096"></a>00096 <span class="keyword">private</span>:
<a name="l00097"></a>00097 <span class="comment">// data member defined by this class</span>
<a name="l00098"></a>00098 CProtocolUser* iProtocolUser;
<a name="l00099"></a>00099 };
<a name="l00100"></a>00100
<a name="l00101"></a>00101
<a name="l00103"></a>00103 <span class="comment">//</span>
<a name="l00104"></a>00104 <span class="comment">// -----> CProtocolUser (implementation)</span>
<a name="l00105"></a>00105 <span class="comment">//</span>
<a name="l00107"></a>00107 <span class="comment"></span>CProtocolUser* CProtocolUser::NewLC()
<a name="l00108"></a>00108 {
<a name="l00109"></a>00109 CProtocolUser* <span class="keyword">self</span>=<span class="keyword">new</span>(ELeave) CProtocolUser;
<a name="l00110"></a>00110 CleanupStack::PushL(<span class="keyword">self</span>);
<a name="l00111"></a>00111 <span class="keyword">self</span>->ConstructL();
<a name="l00112"></a>00112 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00113"></a>00113 }
<a name="l00114"></a>00114
<a name="l00115"></a>00115 CProtocolUser* CProtocolUser::NewL()
<a name="l00116"></a>00116 {
<a name="l00117"></a>00117 CProtocolUser* <span class="keyword">self</span>=NewLC();
<a name="l00118"></a>00118 CleanupStack::Pop();
<a name="l00119"></a>00119 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00120"></a>00120 }
<a name="l00121"></a>00121
<a name="l00122"></a>00122 CProtocolUser::~CProtocolUser()
<a name="l00123"></a>00123 {
<a name="l00124"></a>00124 }
<a name="l00125"></a>00125
<a name="l00126"></a>00126 <span class="keywordtype">void</span> CProtocolUser::ConstructL()
<a name="l00127"></a>00127 {
<a name="l00128"></a>00128 }
<a name="l00129"></a>00129
<a name="l00130"></a>00130 <span class="keywordtype">void</span> CProtocolUser::DoSomething(CProtocol* aProtocol)
<a name="l00131"></a>00131 {
<a name="l00132"></a>00132 <span class="comment">// Do something that requires a protocol</span>
<a name="l00133"></a>00133 _LIT(KTxtExtSystemDoing,<span class="stringliteral">"External system doing something\n"</span>);
<a name="l00134"></a>00134 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtExtSystemDoing);
<a name="l00135"></a>00135 _LIT(KTxtInvokingProtocol,<span class="stringliteral">"invoking protocol - event 3\n"</span>);
<a name="l00136"></a>00136 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtInvokingProtocol);
<a name="l00137"></a>00137 <span class="comment">// Handle an event</span>
<a name="l00138"></a>00138 aProtocol->HandleEvent(3);
<a name="l00139"></a>00139 }
<a name="l00140"></a>00140
<a name="l00141"></a>00141
<a name="l00143"></a>00143 <span class="comment">//</span>
<a name="l00144"></a>00144 <span class="comment">// -----> CProtocolProvider (implementation)</span>
<a name="l00145"></a>00145 <span class="comment">//</span>
<a name="l00147"></a>00147 <span class="comment"></span>CProtocolProvider* CProtocolProvider::NewLC()
<a name="l00148"></a>00148 {
<a name="l00149"></a>00149 CProtocolProvider* <span class="keyword">self</span>=<span class="keyword">new</span>(ELeave) CProtocolProvider;
<a name="l00150"></a>00150 CleanupStack::PushL(<span class="keyword">self</span>);
<a name="l00151"></a>00151 <span class="keyword">self</span>->ConstructL();
<a name="l00152"></a>00152 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00153"></a>00153 };
<a name="l00154"></a>00154
<a name="l00155"></a>00155 CProtocolProvider::~CProtocolProvider()
<a name="l00156"></a>00156 {
<a name="l00157"></a>00157 <span class="keyword">delete</span> iProtocolUser;
<a name="l00158"></a>00158 }
<a name="l00159"></a>00159
<a name="l00160"></a>00160 <span class="keywordtype">void</span> CProtocolProvider::ConstructL()
<a name="l00161"></a>00161 {
<a name="l00162"></a>00162 iProtocolUser=CProtocolUser::NewL();
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164
<a name="l00165"></a>00165 <span class="keywordtype">void</span> CProtocolProvider::CallProtocolUser()
<a name="l00166"></a>00166 {
<a name="l00167"></a>00167 <span class="comment">// Call the protocol user to do some work</span>
<a name="l00168"></a>00168 _LIT(KTxtCallProtUser,<span class="stringliteral">"CProtocolProvider calling protocol user\n"</span>);
<a name="l00169"></a>00169 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KTxtCallProtUser);
<a name="l00170"></a>00170 iProtocolUser->DoSomething(<span class="keyword">this</span>);
<a name="l00171"></a>00171
<a name="l00172"></a>00172 <span class="comment">// pass ourselves, disguised as our (unique)</span>
<a name="l00173"></a>00173 <span class="comment">// base class, so the protocol can be called</span>
<a name="l00174"></a>00174 <span class="comment">// back by the protocol user</span>
<a name="l00175"></a>00175 }
<a name="l00176"></a>00176
<a name="l00177"></a>00177 <span class="keywordtype">void</span> CProtocolProvider::HandleEvent(TInt aEventCode)
<a name="l00178"></a>00178 {
<a name="l00179"></a>00179 <span class="comment">// A concrete implementation of the abstract protocol.</span>
<a name="l00180"></a>00180 <span class="comment">// Handle an event in the protocol user</span>
<a name="l00181"></a>00181 _LIT(KFormat1,<span class="stringliteral">"CProtocolProvider handling event %d\n"</span>);
<a name="l00182"></a>00182 <a class="code" href="dbllist_8cpp.html#d789d40251baeb2f60e118de4856583d">console</a>->Printf(KFormat1,aEventCode);
<a name="l00183"></a>00183 }
<a name="l00184"></a>00184
<a name="l00185"></a>00185
<a name="l00187"></a>00187 <span class="comment">//</span>
<a name="l00188"></a>00188 <span class="comment">// Do the example</span>
<a name="l00189"></a>00189 <span class="comment">//</span>
<a name="l00191"></a>00191 <span class="comment"></span>LOCAL_C <span class="keywordtype">void</span> doExampleL()
<a name="l00192"></a>00192 {
<a name="l00193"></a>00193 <span class="comment">// show use of mixin with simple class</span>
<a name="l00194"></a>00194 CProtocolProvider* simpleProvider=CProtocolProvider::NewLC();
<a name="l00195"></a>00195 <span class="comment">// call protocol user</span>
<a name="l00196"></a>00196 simpleProvider->CallProtocolUser();
<a name="l00197"></a>00197 <span class="comment">// Remove simpleProvider from cleanup stack and destroy</span>
<a name="l00198"></a>00198 CleanupStack::PopAndDestroy();
<a name="l00199"></a>00199 }
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