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<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& aStream);

          void ExternalizeL(RWriteStream& 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 <<  iInt8Value;

          aStream <<  iInt64Value;

          aStream <<  iRectangle

          aStream <<  iUid;

          aStream <<  *iSegBuffer;

          }</codeblock> <codeblock id="GUID-DABABB0C-435F-594C-9424-F27EBDC00F17" xml:space="preserve">void TSimple::InternalizeL(RReadStream&amp; aStream)

          {

          aStream >>  iInt8Value;

          aStream >>  iInt64Value;

          aStream >>  iRectangle

          aStream >>  iUid;

          aStream >>  *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 << 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>