ve runs of the program, and even between minor versions
   of OCaml.  For randomized hash tables, the order of enumeration
   is entirely random.
</p><p>

   The behavior is not defined if the hash table is modified
   by <code class="code">f</code> during the iteration.<br>
</p></div>

<pre><span id="VALfilter_map_inplace"><span class="keyword">val</span> filter_map_inplace</span> : <code class="type">('a -&gt; 'b -&gt; 'b option) -&gt; ('a, 'b) <a href="Hashtbl.html#TYPEt">t</a> -&gt; unit</code></pre><di