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<concept id="GUID-F9FCE3FC-42E4-5E9E-9AFC-A9B02E2612A2" xml:lang="en"><title>Using

TRefByValue&lt;class T&gt; Class</title><shortdesc>This document describes how to use the TRefByValue&lt;class T&gt;

class.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>Functions which take a variable number of arguments, such as <codeph>TDes8::Format()</codeph>,

always take the first parameter as a value reference.</p>

<p>For example, the function <codeph>TDes8::Format()</codeph> is prototyped

as:</p>

<codeblock id="GUID-A3704F62-5577-585E-A6D5-052194467C7D" xml:space="preserve">void Format(TRefByValue&lt;const TDesC8&gt; aFmt,...);</codeblock>

<p>The first argument is a value reference for a <codeph>const         TDesC8</codeph> type.

Just pass a parameter of this type or a parameter that can be converted to

that type. </p>

<codeblock id="GUID-D4B86B9C-43B9-53A1-9038-A9515D6A806B" xml:space="preserve">_LIT(KFormat1,"%b %c %d %o %u %x");

...

tgt.Format(KFormat1,65,65,65,65,65,65);

...</codeblock>