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        <td><font size="6"><strong>Class DS_PAIR</strong></font></td>
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<pre><font color="#000080"><em><strong>note</strong></em></font></pre>

<blockquote>
    <pre><em>description</em>:

<font color="#800000"><em>    &quot;Cells containing two items&quot;

</em></font><em>library:    </em><font color="#800000"><em>&quot;Gobo Eiffel Structure Library&quot;
</em></font><em>author:     </em><font color="#800000"><em>&quot;Eric Bezault &lt;</em></font><a
href="mailto:ericb@gobosoft.com"><font color="#800000"><em>ericb@gobosoft.com</em></font></a><font
color="#800000"><em>&gt;&quot;
</em></font><em>copyright:  </em><font color="#800000"><em>&quot;Copyright (c) 1999, Eric Bezault and others&quot;
</em></font><em>license:   </em><font color="#800000"><em> &quot;MIT License&quot;</em></font></pre>
</blockquote>

<pre><font color="#000080"><em><strong>class interface</strong></em></font></pre>

<blockquote>
    <pre><em>DS_PAIR </em>[<em>G</em>,<em> H</em>]</pre>
</blockquote>

<pre><font color="#000080"><em><strong>inherit</strong></em></font></pre>

<blockquote>
    <pre><a href="ds_cell.html"><em>DS_CELL</em></a><em> </em>[<em>G</em>]</pre>
</blockquote>

<pre><font color="#000080"><em><strong>create</strong></em></font></pre>

<blockquote>
    <pre><a name="make"><em>make</em></a><em> </em>(<em>v</em>:<em> G</em>;<em> w</em>:<em> H</em>)<em>
        </em><font color="#008000">-- Create a new cell containing </font><em>v</em><font
color="#008000"> and </font><em>w</em><font color="#008000">.</font><em>
    </em><font color="#000080"><em><strong>ensure</strong></em></font><em>
        first_set</em>:<em> </em><a href="#first"><em>first</em></a><em> </em>=<em> v
        second_set</em>:<em> </em><a href="#second"><em>second</em></a><em> </em>=<em> w</em></pre>
</blockquote>

<pre><font color="#000080"><em><strong>feature</strong></em></font><font
color="#008000"> -- Access</font></pre>

<blockquote>
    <pre><a name="first"><em>first</em></a>:<em> G
       </em><font color="#008000"> -- First item of cell
        -- (From </font><a href="ds_cell.html#item"><font
color="#008000"><em>item</em></font></a><font color="#008000"> is </font><a
href="ds_cell.html#item"><font color="#008000"><em>DS_CELL</em></font></a><font
color="#008000">.)</font></pre>
    <pre><a name="second"><em>second</em></a>:<em> H</em><font
color="#008000">
        -- Second item of cell</font></pre>
</blockquote>

<pre><font color="#000080"><em><strong>feature </strong></em></font><font
color="#008000">-- Element change</font></pre>

<blockquote>
    <pre><a name="put_first"><em>put_first</em></a><em> </em>(<em>v</em>:<em> G</em>)<em>
        </em><font color="#008000">-- Insert </font><em>v</em><font
color="#008000"> in cell.</font><em>
    </em><font color="#000080"><em><strong>ensure</strong></em></font><em>
        inserted</em>:<em> </em><a href="#first"><em>first</em></a><em> </em>=<em> v</em></pre>
    <pre><a name="put_second"><em>put_second</em></a><em> </em>(<em>w</em>:<em> H</em>)<em>
        </em><font color="#008000">-- Insert </font><em>w</em><font
color="#008000"> in cell.</font><em>
    </em><font color="#000080"><em><strong>ensure</strong></em></font><em>
        inserted: </em><a href="#second"><em>second</em></a><em> = w</em></pre>
</blockquote>

<pre><font color="#000080"><em><strong>end</strong></em></font><font
color="#008000"> -- class DS_PAIR</font></pre>

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        <td><address>
            <font size="2"><b>Copyright © 1999</b></font><font
            size="1"><b>, </b></font><font size="2"><strong>Eric
            Bezault</strong></font><strong> </strong><font
            size="2"><br>
            <strong>mailto:</strong></font><a
            href="mailto:ericb@gobosoft.com"><font size="2">ericb@gobosoft.com</font></a><font
            size="2"><br>
            <strong>http:</strong></font><a
            href="http://www.gobosoft.com"><font size="2">//www.gobosoft.com</font></a><font
            size="2"><br>
            <strong>Last Updated:</strong> 8 August 1999</font><br>
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