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<p>Return the element in the trie which is the longest prefix of <code>key</code>. If no element in the trie is a prefix of <code>key</code>, the end iterator is returned.</p>
<p>Example: </p><pre class="fragment">tsl::htrie_map&lt;char, int&gt; map = {{"/foo", 1}, {"/foo/bar", 1}};

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