Adds asio library and Storage Module
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Gettable socket option requirements</title>
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<link rel="stylesheet" href="../../boostbook.css" type="text/css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
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<link rel="home" href="../../index.html" title="Asio">
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<link rel="up" href="../reference.html" title="Reference">
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<link rel="prev" href="GettableSerialPortOption.html" title="Gettable serial port option requirements">
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<link rel="next" href="Handler.html" title="Handlers">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="GettableSerialPortOption.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="Handler.html"><img src="../../next.png" alt="Next"></a>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.reference.GettableSocketOption"></a><a class="link" href="GettableSocketOption.html" title="Gettable socket option requirements">Gettable socket
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option requirements</a>
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</h3></div></div></div>
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<p>
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A type <code class="computeroutput">X</code> meets the <code class="computeroutput">GettableSocketOption</code> requirements
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if it satisfies the requirements listed below.
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</p>
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<p>
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In the table below, <code class="computeroutput">a</code> denotes a (possibly const) value of type
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<code class="computeroutput">X</code>, <code class="computeroutput">b</code> denotes a value of type <code class="computeroutput">X</code>, <code class="computeroutput">p</code>
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denotes a (possibly const) value that meets the <a class="link" href="Protocol.html" title="Protocol requirements"><code class="computeroutput">Protocol</code></a>
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requirements, and <code class="computeroutput">s</code> denotes a (possibly const) value of a type
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that is convertible to <code class="computeroutput">size_t</code> and denotes a size in bytes.
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</p>
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<div class="table">
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<a name="asio.reference.GettableSocketOption.t0"></a><p class="title"><b>Table 17. GettableSocketOption requirements for extensible implementations</b></p>
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<div class="table-contents"><table class="table" summary="GettableSocketOption requirements for extensible implementations">
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<colgroup>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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expression
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</p>
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</th>
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<th>
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<p>
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type
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</p>
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</th>
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<th>
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<p>
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assertion/note<br> pre/post-conditions
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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<code class="computeroutput">a.level(p)</code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput">int</code>
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</p>
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</td>
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<td>
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<p>
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Returns a value suitable for passing as the <span class="emphasis"><em>level</em></span>
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argument to <span class="emphasis"><em>POSIX</em></span> <a href="http://www.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html" target="_top"><code class="computeroutput"><span class="identifier">getsockopt</span><span class="special">()</span></code></a>
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(or equivalent).
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">a.name(p)</code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput">int</code>
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</p>
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</td>
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<td>
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<p>
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Returns a value suitable for passing as the <span class="emphasis"><em>option_name</em></span>
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argument to <span class="emphasis"><em>POSIX</em></span> <a href="http://www.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html" target="_top"><code class="computeroutput"><span class="identifier">getsockopt</span><span class="special">()</span></code></a>
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(or equivalent).
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">b.data(p)</code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput">void*</code>
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</p>
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</td>
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<td>
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<p>
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Returns a pointer suitable for passing as the <span class="emphasis"><em>option_value</em></span>
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argument to <span class="emphasis"><em>POSIX</em></span> <a href="http://www.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html" target="_top"><code class="computeroutput"><span class="identifier">getsockopt</span><span class="special">()</span></code></a>
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(or equivalent).
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">a.size(p)</code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput">size_t</code>
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</p>
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</td>
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<td>
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<p>
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Returns a value suitable for passing as the <span class="emphasis"><em>option_len</em></span>
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argument to <span class="emphasis"><em>POSIX</em></span> <a href="http://www.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html" target="_top"><code class="computeroutput"><span class="identifier">getsockopt</span><span class="special">()</span></code></a>
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(or equivalent), after appropriate integer conversion has been
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performed.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">b.resize(p,s)</code>
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</p>
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</td>
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<td>
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</td>
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<td>
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<p>
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post: <code class="computeroutput">b.size(p) == s</code>.<br> Passed the value contained
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in the <span class="emphasis"><em>option_len</em></span> argument to <span class="emphasis"><em>POSIX</em></span>
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<a href="http://www.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html" target="_top"><code class="computeroutput"><span class="identifier">getsockopt</span><span class="special">()</span></code></a>
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(or equivalent) after successful completion of the function. Permitted
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to throw an exception if the socket option object <code class="computeroutput">b</code>
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does not support the specified size.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<br class="table-break">
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M.
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Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</p>
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</div></td>
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</tr></table>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="GettableSerialPortOption.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="Handler.html"><img src="../../next.png" alt="Next"></a>
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</div>
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</body>
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</html>
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