rmined by using <code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;</span></code> in the non-predicate versions, and
            by evaluating <code class="computeroutput"><span class="identifier">pred</span></code> in
            the predicate versions.
          </p>
<h6>
<a name="range.reference.algorithms.set.set_difference.h2"></a>
            <span class="phrase"><a name="range.reference.algorithms.set.set_difference.definition"></a></span><a class="link" href=