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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.AsyncRandomAccessWriteDevice"></a><a class="link" href="AsyncRandomAccessWriteDevice.html" title="Buffer-oriented asynchronous random-access write device requirements">Buffer-oriented
      asynchronous random-access write device requirements</a>
</h3></div></div></div>
<p>
        In the table below, <code class="computeroutput"><span class="identifier">a</span></code> denotes
        an asynchronous write stream object, <code class="computeroutput"><span class="identifier">o</span></code>
        denotes an offset of type <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint64_t</span></code>,
        <code class="computeroutput"><span class="identifier">cb</span></code> denotes an object satisfying
        <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">constant buffer
        sequence</a> requirements, and <code class="computeroutput"><span class="identifier">h</span></code>
        denotes an object satisfying <a class="link" href="WriteHandler.html" title="Write handler requirements">write
        handler</a> requirements.
      </p>
<div class="table">
<a name="boost_asio.reference.AsyncRandomAccessWriteDevice.t0"></a><p class="title"><b>Table&#160;2.&#160;Buffer-oriented asynchronous random-access write device requirements</b></p>
<div class="table-contents"><table class="table" summary="Buffer-oriented asynchronous random-access write device requirements">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                <p>
                  operation
                </p>
              </th>
<th>
                <p>
                  type
                </p>
              </th>
<th>
                <p>
                  semantics, pre/post-conditions
                </p>
              </th>
</tr></thead>
<tbody>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">get_io_service</span><span class="special">();</span></code>
                </p>
              </td>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">io_service</span><span class="special">&amp;</span></code>
                </p>
              </td>
<td>
                <p>
                  Returns the <code class="computeroutput"><span class="identifier">io_service</span></code>
                  object through which the <code class="computeroutput"><span class="identifier">async_write_some_at</span></code>
                  handler <code class="computeroutput"><span class="identifier">h</span></code> will
                  be invoked.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">async_write_some_at</span><span class="special">(</span><span class="identifier">o</span><span class="special">,</span>
                  <span class="identifier">cb</span><span class="special">,</span>
                  <span class="identifier">h</span><span class="special">);</span></code>
                </p>
              </td>
<td>
                <p>
                  <code class="computeroutput"><span class="keyword">void</span></code>
                </p>
              </td>
<td>
                <p>
                  Initiates an asynchronous operation to write one or more bytes
                  of data to the device <code class="computeroutput"><span class="identifier">a</span></code>
                  at offset <code class="computeroutput"><span class="identifier">o</span></code>. The
                  operation is performed via the <code class="computeroutput"><span class="identifier">io_service</span></code>
                  object <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">get_io_service</span><span class="special">()</span></code>
                  and behaves according to <a class="link" href="asynchronous_operations.html" title="Requirements on asynchronous operations">asynchronous
                  operation</a> requirements.<br> <br> The constant buffer
                  sequence <code class="computeroutput"><span class="identifier">cb</span></code> specifies
                  memory where the data to be written is located. The <code class="computeroutput"><span class="identifier">async_write_some_at</span></code> operation
                  shall always write a buffer in the sequence completely before proceeding
                  to the next.<br> <br> The implementation shall maintain one
                  or more copies of <code class="computeroutput"><span class="identifier">cb</span></code>
                  until such time as the write operation no longer requires access
                  to the memory specified by the buffers in the sequence. The program
                  must ensure the memory is valid until:<br> <br> &#8212; the last copy
                  of <code class="computeroutput"><span class="identifier">cb</span></code> is destroyed,
                  or<br> <br> &#8212; the handler for the asynchronous write operation
                  is invoked,<br> <br> whichever comes first.<br> <br> If
                  the total size of all buffers in the sequence <code class="computeroutput"><span class="identifier">cb</span></code>
                  is <code class="computeroutput"><span class="number">0</span></code>, the asynchronous
                  write operation shall complete immediately and pass <code class="computeroutput"><span class="number">0</span></code> as the argument to the handler
                  that specifies the number of bytes written.
                </p>
              </td>
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</tbody>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2012 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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