mment">                class_type&amp; operator+= (class_type const &amp; x);</span></div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;<span class="comment">                class_type&amp; operator-= (T const &amp; x);</span></div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;<span class="comment">                class_type&amp; operator-= (class_type const &amp; x);</span></div>
<div class="line"><a name="l00159"></a><span class="lineno">  