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<title>Internet protocol requirements</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.InternetProtocol"></a><a class="link" href="InternetProtocol.html" title="Internet protocol requirements">Internet protocol
requirements</a>
</h3></div></div></div>
<p>
An internet protocol must meet the requirements for a <a class="link" href="Protocol.html" title="Protocol requirements">protocol</a>
as well as the additional requirements listed below.
</p>
<p>
In the table below, <code class="computeroutput"><span class="identifier">X</span></code> denotes
an internet protocol class, <code class="computeroutput"><span class="identifier">a</span></code>
denotes a value of type <code class="computeroutput"><span class="identifier">X</span></code>,
and <code class="computeroutput"><span class="identifier">b</span></code> denotes a value of
type <code class="computeroutput"><span class="identifier">X</span></code>.
</p>
<div class="table">
<a name="boost_asio.reference.InternetProtocol.t0"></a><p class="title"><b>Table 15. InternetProtocol requirements</b></p>
<div class="table-contents"><table class="table" summary="InternetProtocol requirements">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
expression
</p>
</th>
<th>
<p>
return type
</p>
</th>
<th>
<p>
assertion/note<br> pre/post-conditions
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">resolver</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">basic_resolver</span><span class="special"><</span><span class="identifier">X</span><span class="special">></span></code>
</p>
</td>
<td>
<p>
The type of a resolver for the protocol.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">v4</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">X</span></code>
</p>
</td>
<td>
<p>
Returns an object representing the IP version 4 protocol.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">v6</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">X</span></code>
</p>
</td>
<td>
<p>
Returns an object representing the IP version 6 protocol.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">a</span> <span class="special">==</span>
<span class="identifier">b</span></code>
</p>
</td>
<td>
<p>
convertible to <code class="computeroutput"><span class="keyword">bool</span></code>
</p>
</td>
<td>
<p>
Returns whether two protocol objects are equal.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">a</span> <span class="special">!=</span>
<span class="identifier">b</span></code>
</p>
</td>
<td>
<p>
convertible to <code class="computeroutput"><span class="keyword">bool</span></code>
</p>
</td>
<td>
<p>
Returns <code class="computeroutput"><span class="special">!(</span><span class="identifier">a</span>
<span class="special">==</span> <span class="identifier">b</span><span class="special">)</span></code>.
</p>
</td>
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