></a> 
A bitmask
          type (C++ Std [lib.bitmask.types]).
        </p>
<pre class="programlisting">typedef unspecified flags;
</pre>
<h6>
<a name="boost_asio.reference.ip__resolver_base.flags.h0"></a>
          <span class="phrase"><a name="boost_asio.reference.ip__resolver_base.flags.requirements"></a></span><a class="link" href="flags.html#boost_asio.reference.ip__resolver_base.flags.requirements">Requirements</a>
        </h6>
<p>
          <span class="emphasis"><em>Header: </em></span><code class=