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<!DOCTYPE concept
  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="GUID-FF0330E8-81CA-52F3-AD60-89360B74B25D" xml:lang="en"><title>Using
CArrayVar&lt;TAny&gt;</title><shortdesc>The <codeph>CArrayVar&lt;TAny&gt;</codeph> class is useful for constructing
an array of variable length buffers, where the length is decided at run time.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
<section id="GUID-763A4737-913B-417F-A9A6-CB1844EC64F6"><title>Arrays whose type is not known until class instantiation</title> <p>The <codeph>CArrayVar&lt;TAny&gt;</codeph> class
is useful for constructing an array of variable length buffers, where the
length is decided at run time. It is also useful as a data member of a base
class in a thin template class/base class pair,where the type of the array
element is not known until the owning thin template class is instantiated.</p> <p>For
example, to implement a stack of variable length objects of type <codeph>T</codeph>.</p> <codeblock id="GUID-4478A571-F004-5015-9D35-DBEABFDBCFF1" xml:space="preserve">class CExampleBase : public CBase
 {
public :
 ...
protected :
 ...
 void  PushL(const TAny* aPtr);
 TAny* Pop();
private :
 CArrayVar&lt;TAny&gt; iArray;
 }</codeblock> <codeblock id="GUID-3EEED66E-A71A-597D-82B5-E2EAD5AC93CC" xml:space="preserve">template &lt;class T&gt;
class CExample : public CExampleBase
 {
public :
 ...
 inline void PushL(const T* aPtr);
 inline T*   Pop();
 }</codeblock> </section>
</conbody></concept>