ack, <span class="keyword">const</span> acknowledgement_callback_t&amp; acknowledgement_callback);</div><div class="line"><a name="l00361"></a><span class="lineno">  361</span>&#160;</div><div class="line"><a name="l00370"></a><span class="lineno">  370</span>&#160;  <span class="keywordtype">void</span> unprotected_psubscribe(<span class="keyword">const</span> std::string&amp; pattern, <span class="keyword">const</span> subscribe_callback_t&amp; callback, <span class="keyword">const</span> acknowledgement_