><a name="l00137"></a><span class="lineno">  137</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;<span class="comment">                explicit base(T const &amp; x);</span></div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;<span class="comment">                explicit base(value_type const * const x);</span></div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;<spa