Symbian3/SDK/Source/GUID-B70E22E6-CF28-58A0-9D1E-C9A12D1FBC72.dita
author Dominic Pinkman <Dominic.Pinkman@Nokia.com>
Wed, 31 Mar 2010 11:11:55 +0100
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permissions -rw-r--r--
Week 12 contribution of API Specs and fix SDK submission
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License 
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"Eclipse Public License v1.0" which accompanies this distribution, 
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors: 
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-B70E22E6-CF28-58A0-9D1E-C9A12D1FBC72" xml:lang="en"><title>Using
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RPointerArray&lt;class T&gt;</title><shortdesc>This document covers the issues involved in using a RPointerArray.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<section id="GUID-F7FD2F4C-A187-5289-B28D-1A7A40A7EF4B"><title>Freeing all
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memory before the array goes out of scope</title> <p>By convention, class
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names starting with the letter <codeph>R</codeph> do not allocate memory on
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the heap. <codeph>RPointerArray&lt;class T&gt;</codeph> is an <i>exception</i> and
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this should be remembered when using the class. </p> <p>If an array is declared
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on the program stack, then its <codeph>Close()</codeph> or <codeph>Reset()</codeph> member
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function must be called to ensure that allocated memory is freed. </p> <p>Similarly,
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if <codeph>RPointerArray&lt;class T&gt;</codeph> is a data member of another
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class, then the destructor of that class must call <codeph>Close()</codeph> or <codeph>Reset()</codeph>. </p> <p>Another
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issue to remember is the ownership of objects whose pointers are contained
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within an <codeph>RPointerArray&lt;class T&gt;</codeph> array. If ownership of
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the objects lies elsewhere, then calling <codeph>Close()</codeph> or <codeph>Reset()</codeph> before
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the array goes out of scope is sufficient. If, however, ownership of these
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objects is vested in the array, and it is the intention that these objects
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be destroyed when the array is destroyed, then <codeph>ResetAndDestroy()</codeph> must
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be called before the array goes out of scope. </p> </section>
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<section id="GUID-7CBFF894-9704-5018-A062-6EB2DC2D181A"><title>Packaging the
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algorithm for ordering array objects</title> <p>A <codeph>RPointerArray&lt;class
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T&gt;</codeph> array allows its contained pointers to be ordered so that the
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objects themselves are in object order. The array provides the behaviour for
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inserting and sorting instances of pointers to the template class. To help
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with this, the template class must provide an algorithm for deciding how two
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template class objects are ordered. This algorithm is implemented by a function
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which must be wrapped in a <codeph>TLinearOrder&lt;class T&gt;</codeph> package. </p> <p>The
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function implementing the algorithm can be a static member of the class but
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need not necessarily be so. </p> <p>Here, we aim to build an array of <codeph>CMyTest</codeph> objects
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ordered in a way which makes sense for the <codeph>CTMyTest</codeph> class. </p> <codeblock id="GUID-46BBDDDA-9AF5-5A1D-80B0-7F9441D1DBF8" xml:space="preserve">class CMyTest
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 { 
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public 
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 ~CMyTest();
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 Static CMytest* NewL(const TDesC&amp; aText);
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 static TInt Compare(const CMyTest&amp; aFirst, const CMyTest&amp; Second);
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public:
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 HBufC* iText;
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 };</codeblock> <p>In this example, the algorithm is implemented by a static
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function called <codeph>Compare()</codeph>. It takes const references to two <codeph>CMyTest</codeph> objects
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and returns zero if the objects are equal, a negative value if <codeph>aFirst</codeph> is
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less than <codeph>aSecond</codeph> and a positive value if <codeph>aFirst</codeph> is
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greater than <codeph>aSecond</codeph>. </p> <codeblock id="GUID-FE525095-5A8F-52CB-A56C-6E0148011478" xml:space="preserve">TInt CMyTest::Compare(const CMyTest&amp; aFirst,const CMyTest&amp; aSecond)
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 {
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 TInt ret = (aFirst.iText)-&gt;Compare(*aSecond.iText);
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 if (ret &gt; 0)
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  return 1;
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 if (ret &lt; 0)
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  return -1;
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 return 0;
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 }</codeblock> <p>Construct three <codeph>CMyTest</codeph> objects and then
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construct an array object for an array of pointers to <codeph>CMyTest</codeph> objects;
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the array has default granularity. </p> <codeblock id="GUID-DA86C3D4-1D9C-5FAD-B418-9EB65DECB045" xml:space="preserve">_LIT(KTextOne,"First Text");
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_LIT(KTextTwo,"Second Text");
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_LIT(KTextThree,"Third Text");
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...
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CMyTest* one   = CMyTest::NewL(KTextOne);
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CMyTest* two   = CMyTest::NewL(KTextTwo);
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CMyTest* three = CMyTest::NewL(KTextThree);
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RPointerArray&lt;CMyTest&gt; x;</codeblock> <p>There are at least three ways
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of proceeding, some of which are more efficient than others. </p> <ul>
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<li id="GUID-502B71BF-A649-5E1A-90C1-B7822FD61CF8"><p>Explicitly build a <codeph>TLinearOrder&lt;CMyTest&gt;</codeph> and
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pass this as a parameter to <codeph>InsertInOrder()</codeph>. </p> </li>
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</ul> <codeblock id="GUID-65DCB793-5FE3-59F7-B479-DCEDB2FEC5BC" xml:space="preserve">...
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TLinearOrder&lt;CMyTest&gt; order(CMyTest::Compare);
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...
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x.InsertInOrder(one,order);
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...</codeblock> <ul>
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<li id="GUID-A9BEE65B-EA73-57C8-8E3A-FCDAF7D7AFD3"><p>Construct a temporary <codeph>TLinearOrder&lt;CMyTest&gt;</codeph> on
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the call to <codeph>InsertInOrder()</codeph>. </p> </li>
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</ul> <codeblock id="GUID-A61509B0-8473-56BA-B343-3F62A9D54A0B" xml:space="preserve">...
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x.InsertInOrder(one,TLinearOrder&lt;CMyTest&gt;(CMyTest::Compare));
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...</codeblock> <ul>
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<li id="GUID-46064641-BA0A-5FE5-93A1-1C2F3981AB1B"><p>Implicitly construct
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a temporary <codeph>TLinearOrder&lt;CMyTest&gt;</codeph> on the call to <codeph>InsertOrder()</codeph>. </p> </li>
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</ul> <codeblock id="GUID-9B4DA4D7-2DAC-58C6-B958-EDC20ED785B6" xml:space="preserve">...
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x.InsertInOrder(one,CMyTest::Compare);
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...</codeblock> <p>This applies to all member functions of <codeph>RPointerArray&lt;class
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T&gt;</codeph> which take a <codeph>TLinearOrder&lt;class T&gt;</codeph> argument. </p> </section>
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</conbody></concept>