__address_v4.operator_lt_"></a> 
Compare
          addresses for ordering.
        </p>
<pre class="programlisting">friend bool operator&lt;(
    const address_v4 &amp; a1,
    const address_v4 &amp; a2);
</pre>
<h6>
<a name="boost_asio.reference.ip__address_v4.operator_lt_.h0"></a>
          <span class="phrase"><a name="boost_asio.reference.ip__address_v4.operator_lt_.requirements"></a></span><a class="link" href="operator_lt_.html#boost_asio.reference.ip__address_v4.operator_lt_.requirements">Requirement