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<title>Protocol requirements</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="asio.reference.Protocol"></a><a class="link" href="Protocol.html" title="Protocol requirements">Protocol requirements</a>
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<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="asio.reference.Protocol.t0"></a><p class="title"><b>Table&#160;20.&#160;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>
              </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 &#169; 2003-2014 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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