lass="keywordsign">-&gt;</span>&nbsp;bool<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;compare&nbsp;:&nbsp;bool&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;bool&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;to_int&nbsp;:&nbsp;bool&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;to_float&nbsp;:&nbsp;bool&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;float<br>
&nbsp;&nbsp;<s