a name="l00042"></a><span class="lineno">   42</span>&#160;</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;                <span class="comment">// -- Conversions --</span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;                template &lt;typename U, typename V, typename M, typename N&gt;</div>
<div class="line"><a name="l00046"></a><span cl