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<CENTER><B><FONT SIZE=+2>ACE Tutorial 010</FONT></B></CENTER>

<CENTER><B><FONT SIZE=+2>Passing chunks of data through an ACE_Message_Queue</FONT></B></CENTER>


<P>
<HR WIDTH="100%">
Our <A HREF="block.h">Block</A> object is a very simple derivative
of the ACE_Message_Block.  The only reason I created it was to prove
that the message blocks to, indeed, get freed when we're done with 'em.
<P>

<HR WIDTH="100%">
<PRE>
<font color=red>// page03.html,v 1.10 2000/03/19 20:09:25 jcej Exp</font>

<font color=blue>#ifndef</font> <font color=purple>BLOCK_H</font>
<font color=blue>#define</font> <font color=purple>BLOCK_H</font>

<font color=blue>#include</font> "<A HREF="../../../ace/Message_Block.h">ace/Message_Block.h</A>"

<font color=blue>#if !defined</font> (<font color=purple>ACE_LACKS_PRAGMA_ONCE</font>)
<font color=blue># pragma</font> <font color=purple>once</font>
<font color=blue>#endif</font> <font color=red>/* ACE_LACKS_PRAGMA_ONCE */</font>

<font color=red>/* This simple ACE_Message_Block derivative will inform us of it's
   construction and destruction.  We'll use this to assure ourselves
   that we don't have any memory leaks.  In a real application, of
   course, this isn't necessary.  */</font>
class Block : public ACE_Message_Block
{
public:
  Block (void)
  {
    ACE_DEBUG ((LM_DEBUG,
                "<font color=green>(%P|%t) Block ctor 0x%x\n</font>",
                (void *) this));
  }

  Block (size_t size)
    : ACE_Message_Block (size)
  {
    ACE_DEBUG ((LM_DEBUG,
                "<font color=green>(%P|%t) Block ctor 0x%x\n</font>",
                (void *) this));
  }

  virtual ~Block (void)
  {
    ACE_DEBUG ((LM_DEBUG,
                "<font color=green>(%P|%t) Block dtor 0x%x\n</font>",
                (void *) this));
  }
};

<font color=blue>#endif</font> <font color=red>/* BLOCK_H */</font>
</PRE>
<HR WIDTH="100%">
<P>
Ok, nothing really magic there.  Some folks just feel a little uncomfortable
not doing an explicit <i>delete</i> on objects they've <i>new</i>'d so I
wanted to show you that the memory really does get cleaned up.

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