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title="MoreLabels.Hashtbl.SeededHashedType">Next</a> </div> <h1>Module type <a href="type_MoreLabels.Hashtbl.HashedType.html">MoreLabels.Hashtbl.HashedType</a></h1> <pre><span id="MODULETYPEHashedType"><span class="keyword">module type</span> HashedType</span> = <code class="type"><a href="Hashtbl.HashedType.html">Hashtbl.HashedType</a></code></pre><hr width="100%"> <pre><span id="TYPEt"><span class="keyword">type</span> <code class="type"></code>t</span> </pre> <div class="info "> <div class="info-desc"> <p>The type of the hashtable keys.</p> </div> </div> <pre><span id="VALequal"><span class="keyword">val</span> equal</span> : <code class="type"><a href="Hashtbl.HashedType.html#TYPEt">t</a> -> <a href="Hashtbl.HashedType.html#TYPEt">t</a> -> bool</code></pre><div class="info "> <div class="info-desc"> <p>The equality predicate used to compare keys.</p> </div> </div> <pre><span id="VALhash"><span class="keyword">val</span> hash</span> : <code class="type"><a href="Hashtbl.HashedType.html#TYPEt">t</a> -> int</code></pre><div class="info "> <div class="info-desc"> <p>A hashing function on keys. It must be such that if two keys are equal according to <code class="code">equal</code>, then they have identical hash values as computed by <code class="code">hash</code>. Examples: suitable (<code class="code">equal</code>, <code class="code">hash</code>) pairs for arbitrary key types include</p> <ul> <li> (<code class="code">(=)</code>, <a href="Hashtbl.html#VALhash"><code class="code"><span class="constructor">Hashtbl</span>.hash</code></a>) for comparing objects by structure (provided objects do not contain floats)</li> <li> (<code class="code">(<span class="keyword">fun</span> x y <span class="keywordsign">-></span> compare x y = 0)</code>, <a href="Hashtbl.html#VALhash"><code class="code"><span class="constructor">Hashtbl</span>.hash</code></a>) for comparing objects by structure and handling <a href="Pervasives.html#VALnan"><code class="code">nan</code></a> correctly</li> <li> (<code class="code">(==)</code>, <a href="Hashtbl.html#VALhash"><code class="code"><span class="constructor">Hashtbl</span>.hash</code></a>) for comparing objects by physical equality (e.g. for mutable or cyclic objects).</li> </ul> </div> </div> </body></html>