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<a name="Remote-Access-to-Class-Wide-Types-_0028RACW_0029"></a>
<div class="header">
<p>
Next: <a href="Summary-of-Pragma-Remote_005fCall_005fInterface.html#Summary-of-Pragma-Remote_005fCall_005fInterface" accesskey="n" rel="next">Summary of Pragma Remote_Call_Interface</a>, Previous: <a href="Remote-Access-to-Subprograms-_0028RAS_0029.html#Remote-Access-to-Subprograms-_0028RAS_0029" accesskey="p" rel="prev">Remote Access to Subprograms (RAS)</a>, Up: <a href="Pragma-Remote_005fCall_005fInterface.html#Pragma-Remote_005fCall_005fInterface" accesskey="u" rel="up">Pragma Remote_Call_Interface</a> &nbsp; [<a href="About-This-Guide.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Remote-Access-to-Class-Wide-Types-_0028RACW_0029-1"></a>
<h4 class="subsubsection">8.1.4.4 Remote Access to Class Wide Types (RACW)</h4>

<p>A bank client is now connected to a bank through a terminal. The bank
wants to notify a connected client, by means of a message on its
terminal, when another client transfers a given amount of money to its
account. In the following example, a terminal is designed as a
distributed object. Each bank client will register its terminal object
to the bank server for further use. In the code below, Term_Type is the
root type of the distributed terminal hierarchy.
</p>
<div class="smallexample">
<pre class="smallexample">
<b>with</b> Types; <b>use</b> Types;
<b>package</b> Terminal <b>is</b>
   <b>pragma</b> Pure;

   <b>type</b> Term_Type <b>is</b> <b>abstract</b> <b>tagged</b> <b>limited</b> <b>private</b>;

   <b>procedure</b> Notify
     (MyTerm   : <b>access</b> Term_Type;
      Payer    : <b>in</b> Customer_Type;
      Amount   : <b>in</b> Integer) <b>is</b> <b>abstract</b>;

<b>private</b>
   --  implementation removed
<b>end</b> Terminal;

</pre></div>

<p>In the code below, the RCI unit RACWBank defines Term_Access, a remote
access to class wide type. Term_Access becomes a reference to a
distributed object. In the next section, we will see how to derive and
extend Term_Type, how to create a distributed object and how to use a
reference to it.
</p>
<div class="smallexample">
<pre class="smallexample">
<b>with</b> Terminal, Types; <b>use</b> Terminal, Types;
<b>package</b> RACWBank <b>is</b>
   <b>pragma</b> Remote_Call_Interface;

   <b>type</b> Term_Access <b>is</b> <b>access</b> <b>all</b> Term_Type'Class;

   <b>procedure</b> Register
     (MyTerm   : <b>in</b> Term_Access;
      Customer : <b>in</b> Customer_Type;
      Password : <b>in</b> Password_Type);

   --  [...] Other services
<b>end</b> RACWBank;

</pre></div>




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