    <a class="indexterm" name="idp67661648"></a> 
Determine whether the socket is open.
        </p>
<pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">is_open</span><span class="special">(</span>
    <span class="keyword">const</span> <span class="identifier">implementation_type</span> <span class="special">&amp;</span> <span class="identifier">impl</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
</pre>
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