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-<HTML>
-<HEAD>
- <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
- <META NAME="Author" CONTENT="James CE Johnson">
- <TITLE>ACE Tutorial 012</TITLE>
-</HEAD>
-<BODY TEXT="#000000" BGCOLOR="#FFFFFF" LINK="#000FFF" VLINK="#FF0F0F">
-
-<CENTER><B><FONT SIZE=+2>ACE Tutorial 012</FONT></B></CENTER>
-
-<CENTER><B><FONT SIZE=+2>Passing classes through ACE_Message_Queue</FONT></B></CENTER>
-
-
-<P>
-<HR WIDTH="100%">
-<P>
-Last time around we put an object into a message queue by using the
-copy() method to create a duplicate of the object. That's probably OK
-for simple objects that aren't very large. However, if you have an
-object that contains pointers or tons of data then that approach is
-going to cause problems.
-<P>
-What we'll do in this tutorial is specialize the ACE_Message_Block
-object so that it can carry our data more efficiently. As you'll see,
-this isn't very difficult at all.
-<P>
-Kirthika's abstract:
-<UL>
-Here, a Message_Block class is derived from ACE_Message_Block and is
-used to hold a pointer to the object of class Work. Also, the block has
-a header containing text. This example simply illustrates a cleaner way
-of utilizing Message_Blocks to store objects rather than copying their
-contents.
-<P>
-The ACE_Barrier class has been used in the Task class which blocks the
-threads until all of them are rearing to go and grab a block from the
-queue and process it.
-<P>
-Thus a message queue can be used to accomplish a variety of tasks by
-storing a object pointer in the blocks.
-</UL>
-<P><HR WIDTH="100%">
-<CENTER>[<A HREF="../online-tutorials.html">Tutorial Index</A>] [<A HREF="page02.html">Continue This Tutorial</A>]</CENTER>