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20 <code class="code"><span class="keyword">let</span>&nbsp;factory_add_memory&nbsp;=&nbsp;<span class="keyword">fun</span>&nbsp;f&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keyword">fun</span>&nbsp;n&nbsp;<span class="keywordsign">-&gt;</span><br>
21 &nbsp;&nbsp;<span class="keyword">if</span>&nbsp;n&nbsp;&gt;&nbsp;0&nbsp;<span class="keyword">then</span><br>
22 &nbsp;&nbsp;&nbsp;&nbsp;(<br>
23 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">let</span>&nbsp;memory&nbsp;=&nbsp;<span class="constructor">Hashtbl</span>.create&nbsp;n&nbsp;<span class="keyword">in</span><br>
24 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">let</span>&nbsp;new_fun&nbsp;=&nbsp;<span class="keyword">fun</span>&nbsp;i&nbsp;<span class="keywordsign">-&gt;</span><br>
25 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">try</span>&nbsp;<span class="constructor">Hashtbl</span>.find&nbsp;memory&nbsp;i<br>
26 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">with</span>&nbsp;<span class="constructor">Not_found</span>&nbsp;<span class="keywordsign">-&gt;</span><br>
27 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">let</span>&nbsp;result&nbsp;=&nbsp;f&nbsp;i&nbsp;<span class="keyword">in</span><br>
28 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">let</span>&nbsp;()&nbsp;=&nbsp;<span class="constructor">Hashtbl</span>.replace&nbsp;memory&nbsp;i&nbsp;result&nbsp;<span class="keyword">in</span><br>
29 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">let</span>&nbsp;()&nbsp;=&nbsp;<span class="constructor">Hashtbl</span>.remove&nbsp;memory&nbsp;(i&nbsp;-&nbsp;n)&nbsp;<span class="keyword">in</span><br>
30 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;result<br>
31 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">in</span><br>
32 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;new_fun<br>
33 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)<br>
34 &nbsp;&nbsp;<span class="keyword">else</span>&nbsp;raise&nbsp;(<span class="constructor">Value_operation</span>&nbsp;<span class="string">"memory&nbsp;length&nbsp;cannot&nbsp;be&nbsp;&lt;&nbsp;0."</span>&nbsp;)</code></body></html>