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>Buffer-oriented synchronous random-access read device 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="SignalHandler.html" title="Signal handler requirements">
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<link rel="next" href="SyncRandomAccessWriteDevice.html" title="Buffer-oriented synchronous random-access write device requirements">
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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="SignalHandler.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="SyncRandomAccessWriteDevice.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.SyncRandomAccessReadDevice"></a><a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">Buffer-oriented
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synchronous random-access read device requirements</a>
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</h3></div></div></div>
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<p>
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In the table below, <code class="computeroutput">a</code> denotes a synchronous random-access read
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device object, <code class="computeroutput">o</code> denotes an offset of type <code class="computeroutput">boost::uint64_t</code>,
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<code class="computeroutput">mb</code> denotes an object satisfying <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">mutable
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buffer sequence</a> requirements, and <code class="computeroutput">ec</code> denotes an object
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of type <code class="computeroutput">error_code</code>.
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</p>
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<div class="table">
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<a name="asio.reference.SyncRandomAccessReadDevice.t0"></a><p class="title"><b>Table 28. Buffer-oriented synchronous random-access read device requirements</b></p>
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<div class="table-contents"><table class="table" summary="Buffer-oriented synchronous random-access read device requirements">
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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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operation
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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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semantics, 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.read_some_at(o, mb);</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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Equivalent to:
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</p>
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<pre class="programlisting">error_code ec;
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size_t s = a.read_some_at(o, mb, ec);
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if (ec) throw system_error(ec);
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return s;
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</pre>
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<p>
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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.read_some_at(o, mb, ec);</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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Reads one or more bytes of data from the device <code class="computeroutput">a</code>
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at offset <code class="computeroutput">o</code>.<br> <br> The mutable buffer sequence
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<code class="computeroutput">mb</code> specifies memory where the data should be placed.
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The <code class="computeroutput">read_some_at</code> operation shall always fill a buffer
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in the sequence completely before proceeding to the next.<br>
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<br> If successful, returns the number of bytes read and sets
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<code class="computeroutput">ec</code> such that <code class="computeroutput">!ec</code> is true. If an error
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occurred, returns <code class="computeroutput">0</code> and sets <code class="computeroutput">ec</code> such
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that <code class="computeroutput">!!ec</code> is true.<br> <br> If the total size
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of all buffers in the sequence <code class="computeroutput">mb</code> is <code class="computeroutput">0</code>,
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the function shall return <code class="computeroutput">0</code> immediately.
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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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