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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

    <head>
    <title>NSNull class reference</title>
  </head>
  <body>
    <font face="serif">
    <a href="Base.html">Up</a>
    <br />
    <h1><a name="title$NSNull">NSNull class reference</a></h1>
    <h3>Authors</h3>
    <dl>
      <dt>Richard Frith-Macdonald (<a href="mailto:rfm@gnu.org"><code>rfm@gnu.org</code></a>)</dt>
      <dd>
      </dd>
    </dl>
    <p><b>Copyright:</b> (C) 2000 Free Software Foundation, Inc.</p>

        <div>
    </div>

          <h1><a name="001000000000">
        Software documentation for the NSNull class
      </a></h1>
    <h2><a name="class$NSNull">NSNull</a> : <a rel="gsdoc" href="NSObject.html#class$NSObject">NSObject</a></h2>
    <blockquote class="declared">
      <dl>
        <dt><b>Declared in:</b></dt>
        <dd>Foundation/NSNull.h</dd>
      </dl>
    </blockquote>
    <blockquote>
      <dl>
        <dt><b>Conforms to:</b></dt>
        <dd><a rel="gsdoc" href="NSObject.html#protocol$(NSCoding)">NSCoding</a></dd>
        <dd><a rel="gsdoc" href="NSObject.html#protocol$(NSCopying)">NSCopying</a></dd>
      </dl>
    </blockquote>
    <div class="availability">
<b>Availability:</b> MacOS-X 10.0.0</div>
<br />
    <div class="desc">
      
          An object to use as a placeholder - in collections for
          instance.
        
    </div>
    <b>Method summary</b>
    <ul>
      <li><a rel="gsdoc" href="NSNull.html#method$NSNull+null">+null</a></li>
    </ul>
    <hr width="50%" align="left" />
<div class="method">
    <h3><a name="method$NSNull+null">null&nbsp;</a></h3>
    + (<a rel="gsdoc" href="#class$NSNull">NSNull</a>*) <b>null</b>;<br />
    <div class="availability">
<b>Availability:</b> MacOS-X 10.0.0</div>
<br />
    <div class="desc">
      
            Return an object that can be used as a placeholder
            in a collection. This method always returns the same
            object.
          
    </div>
    <hr width="25%" align="left" />
</div>
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