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   <TITLE>ACE Tutorial 011</TITLE>
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<CENTER><B><FONT SIZE=+2>ACE Tutorial 011</FONT></B></CENTER>

<CENTER><B><FONT SIZE=+2>Passing non-trivial data through an ACE_Message_Queue</FONT></B></CENTER>


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Before we go further, let's look at this <A HREF="data.h">Data</A> object
that's causing all the fuss.

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<PRE>
<font color=red>// page04.html,v 1.11 2000/03/19 20:09:26 jcej Exp</font>

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

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

  void who_am_i (void)
  {
    ACE_DEBUG ((LM_DEBUG,
                "<font color=green>(%P|%t) DataBase instance 0x%x\n</font>",
                (void *) this));
  }

  virtual void what_am_i (void)
  {
    ACE_DEBUG ((LM_DEBUG,
                "<font color=green>(%P|%t) I am a DataBase object\n</font>"));
  }

};

class Data : public DataBase
{
public:
  Data (void)
    : message_ (-1)
  {
    ACE_DEBUG ((LM_DEBUG,
                "<font color=green>(%P|%t) Data ctor 0x%x\n</font>",
                (void *) this));
  }

  Data (int message)
    : message_ (message)
  {
    ACE_DEBUG ((LM_DEBUG,
                "<font color=green>(%P|%t) Data ctor 0x%x for message %d\n</font>",
                (void *) this, message_));
  }
  virtual ~Data (void)
  {
    ACE_DEBUG ((LM_DEBUG,
                "<font color=green>(%P|%t) Data dtor 0x%x\n</font>",
                (void *) this));
  }

  void what_am_i (void)
  {
    ACE_DEBUG ((LM_DEBUG,
                "<font color=green>(%P|%t) I am a Data object for message %d\n</font>",
                message_));
  }

protected:
  int message_;
};

<font color=blue>#endif</font> <font color=red>/* DATA_H */</font>
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<P>
Ok, no mysterious magic on this one.  Just a simple object and derivative
that report their existence.
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