author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Fri, 22 Jan 2010 18:26:19 +0000 | |
changeset 1 | 25a17d01db0c |
parent 0 | 89d6a7a84779 |
permissions | -rw-r--r-- |
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Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
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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-D37E0579-0F3B-5EE4-8264-1358E493672B" xml:lang="en"><title>Array |
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of variable length elements, flat buffer</title><shortdesc>Describes how elements of varying length are organised in the array |
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buffer.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>This is a <codeph>CArrayVarFlat<class T></codeph> object whose |
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elements can have different lengths. Although each element is a <codeph>class T</codeph> object, |
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the length of that object can vary.</p> |
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<p>In this type of array, each element occupies its own individual cell allocated |
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from the heap. The array buffer contains fixed length data structures, one |
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for each element, which are physically contiguous within the flat array buffer. |
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Each fixed length data structure contains the length of an element (a <codeph>TInt</codeph> value) |
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and a pointer to it. The structure itself is part of the implementation but |
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occupies no more than eight bytes on 32-bit machines.</p> |
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<p>A flat buffer always occupies a single cell allocated from the heap and |
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Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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is always extended by the process of reallocation. A flat array buffer is |
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implemented using a <codeph>CBufFlat</codeph> object.</p> |
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<p>The following diagram illustrates how elements are organised within the |
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array buffer:</p> |
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<fig id="GUID-2A857FBF-943D-5665-9999-BC27EA321F73"> |
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<image href="GUID-924E26D6-8B9D-5C76-AF61-7C5514BB3D78_d0e190846_href.png" placement="inline"/> |
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</fig> |
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<p>This kind of array is suitable for a small number of elements or for a |
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moderately large but fixed maximum number of elements. It is not suitable |
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for large arrays with a high turnover of elements. </p> |
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<p>This class is immediately derived from the abstract templated base class <codeph>CArrayVar<class T></codeph> which |
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is itself derived from the abstract non-templated base class <codeph>CArrayVarBase</codeph>.</p> |
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<section id="GUID-59ADA2D7-56B2-44C3-8E7C-A5DE5F0BBDBA"><title>See also</title> <p><xref href="GUID-112AAFA5-B4C9-5B62-A106-FB5097C13A0E.dita">Using |
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Dynamic Buffers</xref>.</p> </section> |
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</conbody></concept> |