a><span class="lineno">   45</span>&#160;                <span class="comment">// -- Conversions --</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;                template&lt;</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;                        typename X1, typename Y1, typename Z1,</div>
<div class="line"><a name="l00049"></a><span class="li