author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 21 Jan 2010 18:18:20 +0000 | |
changeset 0 | 89d6a7a84779 |
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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-B1D63E7B-81EB-5F75-96C3-789E5C3E4C03" xml:lang="en"><title>How to |
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construct and manipulate a doubly linked list</title><shortdesc>This document describes how to construct and use a doubly linked |
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list.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>The following code fragments show how a doubly linked list can be constructed |
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and manipulated. The list consists of <codeph>CItem</codeph> objects. In this |
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example, a <codeph>CItem</codeph> object can contain an item of text implemented |
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as an <codeph>HBufC</codeph>. The <codeph>CItem</codeph> objects can form |
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elements of a doubly linked list using the <codeph>iDlink</codeph> data member |
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as the link object. </p> |
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<p>The class is declared as:</p> |
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<codeblock id="GUID-F98B0D2C-486A-59C5-B487-A0F1D7D022FD" xml:space="preserve">class CItem : public CBase |
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{ |
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public : |
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static CItem* NewL(const TDesC& aText); |
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static CItem* NewLC(const TDesC& aText); |
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virtual ~CItem(); |
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public : |
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static const TInt iOffset; |
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private : |
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void ConstructL(const TDesC& aText); |
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private : |
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TDblQueLink iDlink; |
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HBufC* iText; |
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friend class CXy; |
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};</codeblock> |
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<p>The <codeph>CItem</codeph> member functions are implemented as:</p> |
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<codeblock id="GUID-1DAC73DB-A599-5BAC-AAB5-707BA89B8382" xml:space="preserve">const TInt CItem::iOffset = _FOFF(CItem,iDlink);</codeblock> |
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<codeblock id="GUID-6FEA34D4-0937-56E3-ACA5-3912E1595511" xml:space="preserve">CItem* CItem::NewLC(const TDesC& aText) |
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{ |
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CItem* self = new (ELeave) CItem; |
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CleanupStack::PushL(self); |
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self->ConstructL(aText); |
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return self; |
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}</codeblock> |
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<codeblock id="GUID-75110620-3EDC-5B4D-84EB-C4D6C78BF2F9" xml:space="preserve">CItem* CItem::NewL(const TDesC& aText) |
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{ |
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CItem* self = CItem::NewLC(aText); |
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CleanupStack::Pop(); |
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return self; |
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}</codeblock> |
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<codeblock id="GUID-8EABC406-6C95-5139-9A97-AB467D526019" xml:space="preserve">void CItem::ConstructL(const TDesC& aText) |
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{ |
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iText = aText.AllocL(); |
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}</codeblock> |
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<codeblock id="GUID-235AC477-3C7E-52E2-B85B-57C404C8BC08" xml:space="preserve">CItem::~CItem() |
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{ |
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delete (iText); |
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}</codeblock> |
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<p>As part of its construction process, a <codeph>CItem</codeph> constructs |
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an <codeph>HBufC</codeph> of the correct length and copies the content of |
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the descriptor parameter into it.</p> |
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<p>A <codeph>CXy</codeph> object maintains the list by:</p> |
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<ul> |
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<li id="GUID-048EFEF6-B2EC-5333-A835-BC735C334220"><p> creating <codeph>CItem</codeph> objects |
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and adding them into the list</p> </li> |
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<li id="GUID-310AB703-85C5-5DFC-8AB6-2A0938095134"><p>removing <codeph>CItem</codeph> objects |
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from the list and then destroying them</p> </li> |
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</ul> |
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<p>The class is declared as:</p> |
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<codeblock id="GUID-F5CF044D-650A-5446-9713-BE84362FD793" xml:space="preserve">class CXy : public CBase |
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{ |
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public : |
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CXy(); |
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virtual ~CXy(); |
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void DoItems(); |
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TBool AddItem(const TDesC& anItem,TItemPos aPos); |
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private : |
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TDblQue<CItem> iHdr; |
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TDblQueIter<CItem> iIter; |
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};</codeblock> |
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<p>Here, the list header, <codeph>iHdr</codeph>, and the iterator, <codeph>iIter</codeph>, |
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are declared as data members of the class and are constructed when the <codeph>CXy</codeph> object |
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is constructed. A C++ constructor must be supplied so that <codeph>iIter</codeph> can |
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be properly constructed. (<codeph>TDblQueIter</codeph> has no default constructor).</p> |
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<p>Specifically:</p> |
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<ul> |
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<li id="GUID-36B75BBC-B6EA-5717-9E88-8C1FFB4F9119"><p><codeph>AddItem()</codeph> constructs |
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a new <codeph>CItem</codeph> and adds it to the list, either after the current |
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item or at the end of the list.</p> </li> |
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<li id="GUID-B85DEE50-218E-5CC9-B60D-D6EA2176643F"><p><codeph>DoItems()</codeph> scans |
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through the list, removing and destroying each element from the list.</p> </li> |
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</ul> |
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<p>The <codeph>CXy</codeph> member functions are implemented as:</p> |
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<codeblock id="GUID-910891C0-DBEF-592F-8CA3-FC354DE16B3E" xml:space="preserve">CXy::CXy() |
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: iHdr(CItem::iOffset),iIter(iHdr) //construct header & iterator |
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{}</codeblock> |
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<codeblock id="GUID-C471B1FC-05A6-56AD-B3D6-C65FB045B864" xml:space="preserve">CXy::~CXy() |
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{ |
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CItem* anyitem; |
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|
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iIter.SetToFirst(); |
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while ((anyitem = iIter++) != NULL) |
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{ |
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anyitem->iDlink.Deque(); |
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delete anyitem; |
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}; |
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}</codeblock> |
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<p>Before destroying a <codeph>CXy</codeph> object, the list is destroyed. |
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This is achieved using the iterator. The iterator pointer is set to point |
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to each element in turn, removing that element from the list before destroying |
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it.</p> |
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<p>Once the iterator has reached the end of the list, the operator<codeph>++</codeph> returns <codeph>NULL</codeph>.</p> |
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<p>The destruction process is safe if the list is empty; the statement <codeph>iter.SetToFirst()</codeph> is |
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harmless, the operator<codeph>++</codeph> returns <codeph>NULL</codeph> and |
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execution of the body of the <codeph>while</codeph> loop never happens.</p> |
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<codeblock id="GUID-8E2FD32B-B8FF-5F37-9C66-20695B296079" xml:space="preserve">TBool CXy::AddItem(const TDesC& aText,TItemPos aPos) |
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{ |
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CItem* newitem; |
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|
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TRAPD(leavecode,newitem = CItem::NewL(aText)); |
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if (leavecode != KErrNone) |
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return EFalse; // Cannot create a CItem</codeblock> |
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<codeblock id="GUID-6A38CF3D-9547-562D-BB4C-F53938943D15" xml:space="preserve"> switch (aPos) |
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{ |
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case EAtEnd: |
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iHdr.AddLast(*newitem); // Add at back of list |
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return ETrue; |
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|
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case EAfterCurrent: |
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CItem* currentitem = iIter; |
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if (currentitem) |
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{ |
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newitem->iDlink.Enque(&currentitem->iDlink); |
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iIter.Set(*newitem); |
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} |
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else |
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{ |
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iHdr.AddFirst(*newitem); |
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iIter.SetToFirst(); |
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} |
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return ETrue; |
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} |
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|
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return EFalse; |
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}</codeblock> |
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<p>This member function creates a new <codeph>CItem</codeph> and then, depending |
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on the value of <codeph>aPos</codeph>, either adds it at the back of the list |
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or after the current element. <codeph>TItemPos</codeph> is just an enumeration |
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taking the enumerators <codeph>EAtEnd</codeph> and <codeph>EAfterCurrent</codeph>.</p> |
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<p>The statement:</p> |
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<codeblock id="GUID-FBCE5C8F-D42A-50E6-BA1E-A6B2887AF0C1" xml:space="preserve">newitem->iDlink.Enque(&currentitem->iDlink);</codeblock> |
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<p>inserts the newly created <codeph>CItem</codeph> with pointer <codeph>newitem</codeph>, <i>after</i> the |
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existing item with pointer <codeph>currentitem</codeph>.</p> |
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<p>Note also that the statement:</p> |
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<codeblock id="GUID-F875FA76-2768-5713-8462-44610B17F35A" xml:space="preserve">CItem* currentitem = iIter; |
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</codeblock> |
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<p>implicitly uses the conversion operator <codeph>T*()</codeph> where, in |
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general, <codeph>T</codeph> is the class forming elements of the list. In |
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this specific example, the conversion operator returns a pointer to the current |
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element, of type <codeph>CItem</codeph>, in the list. Immediately after construction |
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of the iterator <codeph>iIter</codeph>, the value of <codeph>currentitem</codeph> is <codeph>NULL</codeph>.</p> |
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<codeblock id="GUID-96C01CEC-29F5-537B-9E44-531A313D8796" xml:space="preserve">void CXy::DoItems() |
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{ |
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CItem* currentitem; |
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|
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iIter.SetToFirst(); |
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|
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while((currentitem = iIter++) != NULL) |
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{ |
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// do something with the text; |
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currentitem->iDlink.Deque(); |
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delete currentitem; |
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}; |
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}</codeblock> |
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<p>The <codeph>DoItems()</codeph> member function iterates through the whole |
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list, removing each <codeph>CItem</codeph> object in turn before destroying |
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it. This member function could be modified to include extra functionality |
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before the removal and destruction of the <codeph>CItem</codeph> element.</p> |
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<p>If the list is empty on entry to this function, the <codeph>iter.SetToFirst()</codeph> statement |
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is safe, <codeph>currentitem</codeph> is <codeph>NULL</codeph> on the first |
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execution of the <codeph>while</codeph> condition and the body of the <codeph>while</codeph> loop |
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is never executed.</p> |
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<p>Executing the code:</p> |
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<codeblock id="GUID-081282AE-93D7-59FB-93A7-93D7E1F2080C" xml:space="preserve"> { |
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_LIT(KTxtOne,"one"); |
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_LIT(KTxtTwo,"two"); |
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_LIT(KTxtThree",three"); |
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_LIT(KTxtFour,"four"); |
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_LIT(KTxtFive,"five"); |
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_LIT(KTxtSix,"six"); |
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CXy* items; |
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items = new CXy; |
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|
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items->AddItem(KTxtone,EAfterCurrent); |
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items->AddItem(KTxttwo,EAtEnd); |
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items->AddItem(KTxtthree,EAfterCurrent); |
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items->AddItem(KTxtfour,EAtEnd); |
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items->AddItem(KTxtfive,EAfterCurrent); |
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items->AddItem(KTxtsix,EAtEnd); |
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... |
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</codeblock> |
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<p>results in the construction of a doubly linked list of <codeph>CItem</codeph> objects |
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each containing a pointer to an <codeph>HBufC</codeph> descriptor containing |
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the text as shown:</p> |
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<fig id="GUID-10DC05B0-64A2-52D0-ABC6-ACD231F402C4"> |
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<title/> |
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<image href="GUID-03AC137D-173A-558C-A2F3-9522870AC43C_d0e189390_href.png" placement="inline"/> |
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</fig> |
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<p>The following code destroys the list elements and the <codeph>CXy</codeph> object |
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containing the list header and iterator:</p> |
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<codeblock id="GUID-37EF4182-834F-51BF-9250-61B479BFD3D1" xml:space="preserve"> ... |
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items->DoItems(); |
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delete items; |
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}</codeblock> |
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<p>There are a number of other possible ways to proceed, depending on the |
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precise needs of an application. In the previous example, the list header |
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and the iterator are declared as members of the class.</p> |
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<p>Some situations may demand that a list be created, used and destroyed within |
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the scope of a member function. Because list headers and iterators are “<codeph>T</codeph> ” |
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types, they can be declared on the stack; for example:</p> |
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<codeblock id="GUID-E29EDC0D-C7DE-5E35-B39F-DA63110DF630" xml:space="preserve">void CXy::SomeFunction(); |
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{ |
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TDblQue<CItem> iHdr(CItem::iOffset); |
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TDblQueIter<CItem> iIter(iHdr); |
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|
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// the body of the function |
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// |
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|
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} |
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</codeblock> |
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<p>The list header and the iterator go out of scope at the end of the function |
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and are destroyed. Unless the list elements themselves are “<codeph>T</codeph> ” |
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types and exist on the stack, make sure that they are explicitly destroyed |
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before the function terminates.</p> |
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</conbody></concept> |