 corresponds exactly to
<code>characterIndex</code>.</p>

<p><strong>Requires:</strong> <code>characterIndex</code> is an element of
  <code>String(utf16)!.indices</code>.</p>

    <h4>Declaration</h4>    
    <code class="language-swift">init(_ characterIndex: Index, within utf16: String.UTF16View)</code>

    </div></div>
</div>
<div class="declaration" id="init_-unicodescalarindex-within_-string-utf16view">
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