ntifier">use_default</span></code> type is not left unspecified
        because specification helps to highlight that the <code class="computeroutput"><span class="identifier">Reference</span></code>
        template parameter may not always be identical to the iterator's <code class="computeroutput"><span class="identifier">reference</span></code> type, and will keep users from
        making mistakes based on that assumption.
      </p>
<div class="section">
<div class="titlepage"><div><div><h4 class="tit