<?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 xml:lang="en" id="GUID-DA4160B0-7B63-5C84-B3C6-190100530EDE"><title>How to use templated stream operators</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>Templated stream operators are straight forward to use. For example, given the class <codeph>TSimple</codeph> defined as:</p> <codeblock id="GUID-E705AC6E-6671-552D-90A3-6BEF66E30A0C" xml:space="preserve">    class TSimple
          {
    public :
          void InternalizeL(RReadStream&amp; aStream);
          void ExternalizeL(RWriteStream&amp; aStream) const;
          ...
          TInt8     iInt8Value;
          TInt64    iInt64Value;
          TRect     iRectangle;
          TUid      iUid;
          CBufSeg*  iSegBuffer;
          }</codeblock> <p><codeph>ExternalizeL()</codeph> and <codeph>InternalizeL()</codeph> might be implemented as:</p> <codeblock id="GUID-F89A6EEB-FA20-5A2B-A3DB-33630212DD70" xml:space="preserve">void TSimple::ExternalizeL(RWriteStream&amp; aStream) const
          {
          aStream &lt;&lt;  iInt8Value;
          aStream &lt;&lt;  iInt64Value;
          aStream &lt;&lt;  iRectangle
          aStream &lt;&lt;  iUid;
          aStream &lt;&lt;  *iSegBuffer;
          }</codeblock> <codeblock id="GUID-DABABB0C-435F-594C-9424-F27EBDC00F17" xml:space="preserve">void TSimple::InternalizeL(RReadStream&amp; aStream)
          {
          aStream &gt;&gt;  iInt8Value;
          aStream &gt;&gt;  iInt64Value;
          aStream &gt;&gt;  iRectangle
          aStream &gt;&gt;  iUid;
          aStream &gt;&gt;  *iSegBuffer;
          }</codeblock> <p>The templated operators can also be used on an object of type <codeph>TSimple</codeph>. For example:</p> <codeblock id="GUID-326FFA1F-3614-5257-A3F9-1908F25E5DC8" xml:space="preserve">TSimple simple;
...
aStream &lt;&lt; simple;
...</codeblock> <p>The <codeph>operator&lt;&lt;</codeph> results in call to <codeph>TSimple::ExternalizeL()</codeph> function and this, in turn, calls <codeph>operator&lt;&lt;</codeph> on <codeph>TSimple</codeph>'s data members.</p> </conbody></concept>