diff -r 000000000000 -r 89d6a7a84779 Symbian3/SDK/Source/GUID-82862A69-5E86-5924-BFF0-F7655FCBFAF0.dita
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-82862A69-5E86-5924-BFF0-F7655FCBFAF0.dita	Thu Jan 21 18:18:20 2010 +0000
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-82862A69-5E86-5924-BFF0-F7655FCBFAF0" xml:lang="en"><title>Contiguousness</title><shortdesc>Description of contiguous data in flat and segmented buffers.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>In flat buffers, all data is contiguous. The <codeph>Ptr()</codeph> function
+always returns a pointer descriptor from the buffer position specified to
+the end of the data, and the <codeph>BackPtr()</codeph> function always returns
+a pointer descriptor from the beginning of the buffer to the buffer position
+specified.</p>
+<p>In segmented buffers, data is contained in segments and the maximum length
+of contiguous data is the granularity of the buffer. The extent of contiguous
+data contained in a segment may vary between a single byte, and the granularity,
+if the insertion and deletion pattern is arbitrary.</p>
+<p>However, the following guarantee is made: if the number of bytes inserted
+or deleted in <i>all</i> insertion and deletion operations is a multiple of
+some number <i>n</i>, and the granularity is also a multiple of this number <i>n</i>,
+then all data extents will be a multiple of <i>n</i> in length. This implies
+that the <codeph>Ptr()</codeph> function, given a buffer position which is
+a multiple of <i>n</i>, will always return a pointer descriptor referring
+to at least <i>n</i> bytes.</p>
+<p>This property of segmented descriptors is exploited by the <codeph>CArrayFixBase</codeph>, <codeph>CArrayVarBase</codeph> and <codeph>CArrayPakBase</codeph> derived array classes. In these classes, all insertion or deletion operations
+are always done in terms of the (fixed) length of data stored in the buffer.
+Therefore, the data for an individual array element is always contiguous.</p>
+</conbody><related-links>
+<link>
+<desc><xref href="GUID-2F64B579-73D3-548A-9104-16483AF77BCB.dita">Dynamic Arrays</xref></desc>
+</link>
+</related-links></concept>
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