string&amp;)&gt; <a class="code" href="classcpp__redis_1_1subscriber.html#ac6ab8ebc526d784e4b79a39bbd73dca8">subscribe_callback_t</a>;</div><div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;</div><div class="line"><a name="l00176"></a><span class="lineno"><a class="line" href="classcpp__redis_1_1subscriber.html#a19ea39dfabeb19937a9ce4c8d21781b4">  176</a></span>&#160;  <span class="keyword">typedef</span> std::function&lt;void(int64_t)&gt; <a class="code" href="classcpp__redis_1_