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 asynchronous random-access write 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="AsyncRandomAccessReadDevice.html" title="Buffer-oriented asynchronous random-access read device requirements">
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<link rel="next" href="AsyncReadStream.html" title="Buffer-oriented asynchronous read stream 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="AsyncRandomAccessReadDevice.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="AsyncReadStream.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.AsyncRandomAccessWriteDevice"></a><a class="link" href="AsyncRandomAccessWriteDevice.html" title="Buffer-oriented asynchronous random-access write device requirements">Buffer-oriented
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asynchronous random-access write 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 an asynchronous write stream object,
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<code class="computeroutput">o</code> denotes an offset of type <code class="computeroutput">boost::uint64_t</code>, <code class="computeroutput">cb</code>
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denotes an object satisfying <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">constant
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buffer sequence</a> requirements, and <code class="computeroutput">h</code> denotes an object
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satisfying <a class="link" href="WriteHandler.html" title="Write handler requirements">write handler</a>
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requirements.
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</p>
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<div class="table">
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<a name="asio.reference.AsyncRandomAccessWriteDevice.t0"></a><p class="title"><b>Table 3. Buffer-oriented asynchronous random-access write device requirements</b></p>
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<div class="table-contents"><table class="table" summary="Buffer-oriented asynchronous random-access write 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.get_executor()</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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A type satisfying the <a class="link" href="Executor1.html" title="Executor requirements">Executor
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requirements</a>.
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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 the associated I/O executor.
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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.async_write_some_at(o, cb, h);</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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Initiates an asynchronous operation to write one or more bytes
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of data to the device <code class="computeroutput">a</code> at offset <code class="computeroutput">o</code>.
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The operation is performed via the <code class="computeroutput">io_service</code> object
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<code class="computeroutput">a.get_io_service()</code> and behaves according to <a class="link" href="asynchronous_operations.html" title="Requirements on asynchronous operations">asynchronous operation</a>
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requirements.<br> <br> The constant buffer sequence <code class="computeroutput">cb</code>
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specifies memory where the data to be written is located. The
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<code class="computeroutput">async_write_some_at</code> operation shall always write a
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buffer in the sequence completely before proceeding to the next.<br>
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<br> The implementation shall maintain one or more copies of
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<code class="computeroutput">cb</code> until such time as the write operation no longer
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requires access to the memory specified by the buffers in the sequence.
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The program must ensure the memory is valid until:<br> <br>
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— the last copy of <code class="computeroutput">cb</code> is destroyed, or<br> <br>
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— the handler for the asynchronous write operation is invoked,<br>
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<br> whichever comes first.<br> <br> If the total size of
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all buffers in the sequence <code class="computeroutput">cb</code> is <code class="computeroutput">0</code>,
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the asynchronous write operation shall complete immediately and
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pass <code class="computeroutput">0</code> as the argument to the handler that specifies
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the number of bytes written.
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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="AsyncRandomAccessReadDevice.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="AsyncReadStream.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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