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<title>Protocol requirements</title>
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<div class="section" title="Protocol requirements">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.Protocol"></a><a class="link" href="Protocol.html" title="Protocol requirements"> Protocol requirements</a>
</h3></div></div></div>
<p>
A protocol must meet the requirements of <code class="computeroutput"><span class="identifier">CopyConstructible</span></code>
types (C++ Std, 20.1.3), and the requirements of <code class="computeroutput"><span class="identifier">Assignable</span></code>
types (C++ Std, 23.1).
</p>
<p>
In the table below, <code class="computeroutput"><span class="identifier">X</span></code> denotes
a protocol class, and <code class="computeroutput"><span class="identifier">a</span></code> denotes
a value of <code class="computeroutput"><span class="identifier">X</span></code>.
</p>
<div class="table">
<a name="id632818"></a><p class="title"><b>Table 19. Protocol requirements</b></p>
<div class="table-contents"><table class="table" summary="Protocol 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">endpoint</span></code>
</p>
</td>
<td>
<p>
type meeting <a class="link" href="Endpoint.html" title="Endpoint requirements">endpoint</a>
requirements
</p>
</td>
<td>
<p>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">family</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">int</span></code>
</p>
</td>
<td>
<p>
Returns a value suitable for passing as the <span class="emphasis"><em>domain</em></span>
argument to <span class="emphasis"><em>POSIX</em></span> <a href="http://www.opengroup.org/onlinepubs/000095399/functions/socket.html" target="_top"><code class="computeroutput"><span class="identifier">socket</span><span class="special">()</span></code></a>
(or equivalent).
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">type</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">int</span></code>
</p>
</td>
<td>
<p>
Returns a value suitable for passing as the <span class="emphasis"><em>type</em></span>
argument to <span class="emphasis"><em>POSIX</em></span> <a href="http://www.opengroup.org/onlinepubs/000095399/functions/socket.html" target="_top"><code class="computeroutput"><span class="identifier">socket</span><span class="special">()</span></code></a>
(or equivalent).
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">protocol</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">int</span></code>
</p>
</td>
<td>
<p>
Returns a value suitable for passing as the <span class="emphasis"><em>protocol</em></span>
argument to <span class="emphasis"><em>POSIX</em></span> <a href="http://www.opengroup.org/onlinepubs/000095399/functions/socket.html" target="_top"><code class="computeroutput"><span class="identifier">socket</span><span class="special">()</span></code></a>
(or equivalent).
</p>
</td>
</tr>
</tbody>
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<td align="right"><div class="copyright-footer">Copyright © 2003 - 2010 Christopher M. Kohlhoff<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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