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<link title="Weak" rel="Chapter" href="Weak.html"><title>Hashtbl.HashedType</title>
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<h1>Module type <a href="type_Hashtbl.HashedType.html">Hashtbl.HashedType</a></h1>
<pre><span id="MODULETYPEHashedType"><span class="keyword">module type</span> HashedType</span> = <code class="code"><span class="keyword">sig</span></code> <a href="Hashtbl.HashedType.html">..</a> <code class="code"><span class="keyword">end</span></code></pre><div class="info modtype top">
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<p>The input signature of the functor <a href="Hashtbl.Make.html"><code class="code"><span class="constructor">Hashtbl</span>.<span class="constructor">Make</span></code></a>.</p>
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<pre><span id="TYPEt"><span class="keyword">type</span> <code class="type"></code>t</span> </pre>
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<p>The type of the hashtable keys.</p>
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<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 ">
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<p>The equality predicate used to compare keys.</p>
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<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 ">
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<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>
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<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="Stdlib.html#VALnan"><code class="code">nan</code></a> correctly</li>
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equality (e.g. for mutable or cyclic objects).</li>
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