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<concept id="GUID-D7DF85A8-1F90-5EC8-9EA1-EB33382849B0" xml:lang="en"><title>TAndRClasses:
typical ‘T’ and ‘R’ type classes</title><prolog><metadata><keywords/></metadata></prolog><conbody>
<section><title>Description</title> <p> <filepath>TAndRClasses</filepath> shows
a typical ‘T’ class and a typical ‘R’ class. </p> <p>The ‘T’ type is a value
type, owning no external object. </p> <p>The ‘R’ type is a resource type;
typically this is proxy for an object owned elsewhere. In practice, the 'R'
type is a handle to a resource owned and managed by the Kernel. </p> <p>In
this example, the ‘R’ class derives from the standard Symbian platform handle
class <codeph>RTimer</codeph>. </p> </section>
<section><title>Download</title> <p>Click on the following link to download
the example: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/zips/guid-1bfb2b42-8897-4660-8409-5e9fd441745b.zip" scope="external"> TAndRClasses.zip</xref></p><p>Click on the following link
to download additional files: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/zips/guid-bd05bfa4-e51c-4cf7-b327-646b0b9e814d.zip" scope="external">CommonFramework.zip</xref></p><p>Click <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/guid-1bfb2b42-8897-4660-8409-5e9fd441745b.html" scope="peer"> browse TAndRClasses </xref> to view the example code.</p><p>Click <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/guid-bd05bfa4-e51c-4cf7-b327-646b0b9e814d.html" scope="peer">CommonFramework</xref> to view additional files.</p> </section>
<section><title>Class summary</title><p> <xref href="GUID-8A423EA2-4264-30C9-9579-0466994E6E88.dita"><apiname>RTimer </apiname></xref>  <xref href="GUID-CD0A798E-7E42-3689-8E86-F5FD43C758FC.dita"><apiname>TCleanupItem </apiname></xref> <xref href="GUID-0DD554D7-B9B1-3FD3-898F-4D855144FCEA.dita"><apiname>CleanupStack </apiname></xref>  <xref href="GUID-E0B34F3E-D4C4-3232-B8B1-7DB35B454646.dita"><apiname>TRequestStatus</apiname></xref> </p></section>
<section><title>Build</title> <p>The example includes the two project files
needed for building: <filepath>bld.inf</filepath> and the <filepath>.mmp</filepath> file. </p> <p><xref href="GUID-3100800B-B2F7-50EF-BD4C-3C345ECCB2A5.dita">The Symbian platform build
process</xref> describes how to build this application, which results in an
executable called: </p> <p> <filepath>\epoc32\release\&lt;target&gt;\&lt;urel
or udeb&gt;\TANDRCLASSES.EXE</filepath>. </p> </section>
<section><title>Usage</title> <p>Run the executable <filepath>TANDRCLASSES.EXE</filepath>. </p> <p>Executables
for the emulator targets <filepath>wins</filepath> and <filepath>winscw</filepath> can
be run on your PC. Executables for ARM targets must be copied to your target
platform before being run. </p> </section>
</conbody></concept>