he type of a signal set implementation.
        </p>
<pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">implementation_defined</span> <span class="identifier">implementation_type</span><span class="special">;</span>
</pre>
<h6>
<a name="boost_asio.reference.signal_set_service.implementation_type.h0"></a>
          <span><a name="boost_asio.reference.signal_set_service.implementation_type.requirements"></a></span><a class="link" href="implementation_type.html#boost_asio