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| <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="id832628"></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> |
| </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">&</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 © 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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