special">::</span><span class="identifier">string_type</span> <a name="id-1_3_47_5_3_2_1_2_15_4_1-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Sub</span> <span class="keyword">const</span> <span class="special">&amp;</span> sub<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>

</p>
<div class="variablelist"><table border="0" class="variabl