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<title>Endpoint requirements</title>
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<div class="section" title="Endpoint requirements">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_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="id625859"></a><p class="title"><b>Table 10. 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>
<p>
</p>
</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>
<p>
</p>
</td>
<td>
<p>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">X</span><span class="special">();</span></code>
</p>
</td>
<td>
<p>
</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">protocol</span><span class="special">();</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">protocol_type</span></code>
</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">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">&</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>
<p>
</p>
</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>
</div>
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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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