" id="details"></a><h2 class="groupheader">Description</h2>
<p>The <code>Hashable</code> concept represents objects that can be normalized to a type-level hash. </p>
<p>In day to day programming, hashes are very important as a way to efficiently lookup objects in maps. While the implementation of maps is very different, the same idea of using hashes for efficient lookup applies in metaprogramming. The <code>Hashable</code> concept represents objects that can be summarized (possibly with loss of information)