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<title>Endpoint requirements</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="asio.reference.Endpoint"></a><a class="link" href="Endpoint.html" title="Endpoint requirements">Endpoint requirements</a>
</h3></div></div></div>
<p>
        An endpoint 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
        an endpoint class, <code class="computeroutput"><span class="identifier">a</span></code> denotes
        a value of type <code class="computeroutput"><span class="identifier">X</span></code>, <code class="computeroutput"><span class="identifier">s</span></code> denotes a size in bytes, and <code class="computeroutput"><span class="identifier">u</span></code> denotes an identifier.
      </p>
<div class="table">
<a name="asio.reference.Endpoint.t0"></a><p class="title"><b>Table&#160;10.&#160;Endpoint requirements</b></p>
<div class="table-contents"><table class="table" summary="Endpoint requirements">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                <p>
                  expression
                </p>
              </th>
<th>
                <p>
                  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">protocol_type</span></code>
                </p>
              </td>
<td>
                <p>
                  type meeting <a class="link" href="Protocol.html" title="Protocol requirements">protocol</a>
                  requirements
                </p>
              </td>
<td>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">X</span> <span class="identifier">u</span><span class="special">;</span></code>
                </p>
              </td>
<td>
              </td>
<td>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">X</span><span class="special">();</span></code>
                </p>
              </td>
<td>
              </td>
<td>
              </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="identifier">protocol_type</span></code>
                </p>
              </td>
<td>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">data</span><span class="special">();</span></code>
                </p>
              </td>
<td>
                <p>
                  a pointer
                </p>
              </td>
<td>
                <p>
                  Returns a pointer suitable for passing as the <span class="emphasis"><em>address</em></span>
                  argument to <span class="emphasis"><em>POSIX</em></span> functions such as <a href="http://www.opengroup.org/onlinepubs/000095399/functions/accept.html" target="_top"><code class="computeroutput"><span class="identifier">accept</span><span class="special">()</span></code></a>,
                  <a href="http://www.opengroup.org/onlinepubs/000095399/functions/getpeername.html" target="_top"><code class="computeroutput"><span class="identifier">getpeername</span><span class="special">()</span></code></a>,
                  <a href="http://www.opengroup.org/onlinepubs/000095399/functions/getsockname.html" target="_top"><code class="computeroutput"><span class="identifier">getsockname</span><span class="special">()</span></code></a>
                  and <a href="http://www.opengroup.org/onlinepubs/000095399/functions/recvfrom.html" target="_top"><code class="computeroutput"><span class="identifier">recvfrom</span><span class="special">()</span></code></a>.
                  The implementation shall perform a <code class="computeroutput"><span class="keyword">reinterpret_cast</span></code>
                  on the pointer to convert it to <code class="computeroutput"><span class="identifier">sockaddr</span><span class="special">*</span></code>.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="keyword">const</span> <span class="identifier">X</span><span class="special">&amp;</span> <span class="identifier">u</span>
                  <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span> <span class="identifier">u</span><span class="special">.</span><span class="identifier">data</span><span class="special">();</span></code>
                </p>
              </td>
<td>
                <p>
                  a pointer
                </p>
              </td>
<td>
                <p>
                  Returns a pointer suitable for passing as the <span class="emphasis"><em>address</em></span>
                  argument to <span class="emphasis"><em>POSIX</em></span> functions such as <a href="http://www.opengroup.org/onlinepubs/000095399/functions/connect.html" target="_top"><code class="computeroutput"><span class="identifier">connect</span><span class="special">()</span></code></a>,
                  or as the <span class="emphasis"><em>dest_addr</em></span> argument to <span class="emphasis"><em>POSIX</em></span>
                  functions such as <a href="http://www.opengroup.org/onlinepubs/000095399/functions/sendto.html" target="_top"><code class="computeroutput"><span class="identifier">sendto</span><span class="special">()</span></code></a>.
                  The implementation shall perform a <code class="computeroutput"><span class="keyword">reinterpret_cast</span></code>
                  on the pointer to convert it to <code class="computeroutput"><span class="keyword">const</span>
                  <span class="identifier">sockaddr</span><span class="special">*</span></code>.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">size</span><span class="special">();</span></code>
                </p>
              </td>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">size_t</span></code>
                </p>
              </td>
<td>
                <p>
                  Returns a value suitable for passing as the <span class="emphasis"><em>address_len</em></span>
                  argument to <span class="emphasis"><em>POSIX</em></span> functions such as <a href="http://www.opengroup.org/onlinepubs/000095399/functions/connect.html" target="_top"><code class="computeroutput"><span class="identifier">connect</span><span class="special">()</span></code></a>,
                  or as the <span class="emphasis"><em>dest_len</em></span> argument to <span class="emphasis"><em>POSIX</em></span>
                  functions such as <a href="http://www.opengroup.org/onlinepubs/000095399/functions/sendto.html" target="_top"><code class="computeroutput"><span class="identifier">sendto</span><span class="special">()</span></code></a>,
                  after appropriate integer conversion has been performed.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">resize</span><span class="special">(</span><span class="identifier">s</span><span class="special">);</span></code>
                </p>
              </td>
<td>
              </td>
<td>
                <p>
                  post: <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">size</span><span class="special">()</span>
                  <span class="special">==</span> <span class="identifier">s</span></code><br>
                  Passed the value contained in the <span class="emphasis"><em>address_len</em></span>
                  argument to <span class="emphasis"><em>POSIX</em></span> functions such as <a href="http://www.opengroup.org/onlinepubs/000095399/functions/accept.html" target="_top"><code class="computeroutput"><span class="identifier">accept</span><span class="special">()</span></code></a>,
                  <a href="http://www.opengroup.org/onlinepubs/000095399/functions/getpeername.html" target="_top"><code class="computeroutput"><span class="identifier">getpeername</span><span class="special">()</span></code></a>,
                  <a href="http://www.opengroup.org/onlinepubs/000095399/functions/getsockname.html" target="_top"><code class="computeroutput"><span class="identifier">getsockname</span><span class="special">()</span></code></a>
                  and <a href="http://www.opengroup.org/onlinepubs/000095399/functions/recvfrom.html" target="_top"><code class="computeroutput"><span class="identifier">recvfrom</span><span class="special">()</span></code></a>,
                  after successful completion of the function. Permitted to throw
                  an exception if the protocol associated with the endpoint object
                  <code class="computeroutput"><span class="identifier">a</span></code> does not support
                  the specified size.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">();</span></code>
                </p>
              </td>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">size_t</span></code>
                </p>
              </td>
<td>
                <p>
                  Returns a value suitable for passing as the <span class="emphasis"><em>address_len</em></span>
                  argument to <span class="emphasis"><em>POSIX</em></span> functions such as <a href="http://www.opengroup.org/onlinepubs/000095399/functions/accept.html" target="_top"><code class="computeroutput"><span class="identifier">accept</span><span class="special">()</span></code></a>,
                  <a href="http://www.opengroup.org/onlinepubs/000095399/functions/getpeername.html" target="_top"><code class="computeroutput"><span class="identifier">getpeername</span><span class="special">()</span></code></a>,
                  <a href="http://www.opengroup.org/onlinepubs/000095399/functions/getsockname.html" target="_top"><code class="computeroutput"><span class="identifier">getsockname</span><span class="special">()</span></code></a>
                  and <a href="http://www.opengroup.org/onlinepubs/000095399/functions/recvfrom.html" target="_top"><code class="computeroutput"><span class="identifier">recvfrom</span><span class="special">()</span></code></a>,
                  after appropriate integer conversion has been performed.
                </p>
              </td>
</tr>
</tbody>
</table></div>
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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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