pressor</b>

<blockquote>
Instances of these classes may be created via make-instance. The only
supported initarg is <tt>:CALLBACK</tt>.
See <a href='#callback'><tt>CALLBACK</tt></a> for the expected value.
</blockquote>


<p><a name='callback'>[Accessor]</a><br>
<b>callback</b> <i>compressor</i> => <i>callback</i><br>
(<tt>setf</tt> (<b>callback</b> <i>compressor</i>) <i>new-value</i>) 
=> <i>new-value</i>

<blockquote>
Gets or sets the callback function of <i>compressor</i>. The callback
should be a funct