Author: James CE Johnson

ACE Tutorial 011
Passing non-trivial data through an ACE_Message_Queue

Before we go further, let's look at this Data object that's causing all the fuss.

    // page04.html,v 1.9 1999/04/03 21:56:27 jcej Exp

    #ifndef DATA_H
    #define DATA_H

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

      void who_am_i (void)
      {
        ACE_DEBUG ((LM_DEBUG,
                    "(%P|%t) DataBase instance 0x%x\n",
                    (void *) this));
      }

      virtual void what_am_i (void)
      {
        ACE_DEBUG ((LM_DEBUG,
                    "(%P|%t) I am a DataBase object\n"));
      }

    };

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

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

      void what_am_i (void)
      {
        ACE_DEBUG ((LM_DEBUG,
                    "(%P|%t) I am a Data object for message %d\n",
                    message_));
      }

    protected:
      int message_;
    };

    #endif /* DATA_H */

Ok, no mysterious magic on this one. Just a simple object and derivative that report their existence.

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