e class="programlisting"><span class="identifier">os</span> <span class="special">&lt;&lt;</span> <span class="identifier">seq</span>
</pre>
<p>
            <span class="bold"><strong>Return type</strong></span>: OStream&amp;
          </p>
<p>
            <span class="bold"><strong>Semantics</strong></span>: For each element, <code class="computeroutput"><span class="identifier">e</span></code>, in sequence, <code class="computeroutput"><span class="identifier">seq</span></code>,
            call <code cla