Q&gt; <span class="keyword">const</span>&amp; q2,</div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;        qua&lt;T, Q&gt; <span class="keyword">const</span>&amp; s1,</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;        qua&lt;T, Q&gt; <span class="keyword">const</span>&amp; s2,</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;        T <span class="keyword">const</span>&amp; h);</div><div class="line">