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  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="boost_asio.reference.async_write_at"></a><a class="link" href="async_write_at.html" title="async_write_at">async_write_at</a>
  28 </h3></div></div></div>
  29 <p>
  30         <a class="indexterm" name="boost_asio.indexterm.async_write_at"></a>
  31 The <code class="computeroutput">async_write_at</code>
  32         function is a composed asynchronous operation that writes a certain amount
  33         of data at the specified offset before completion.
  34       </p>
  35 <p>
  36         Start an asynchronous operation to write all of the supplied data at the
  37         specified offset.
  38       </p>
  39 <pre class="programlisting">template&lt;
  40     typename <a class="link" href="AsyncRandomAccessWriteDevice.html" title="Buffer-oriented asynchronous random-access write device requirements">AsyncRandomAccessWriteDevice</a>,
  41     typename <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a>,
  42     typename <a class="link" href="WriteHandler.html" title="Write handler requirements">WriteHandler</a>&gt;
  43 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="async_write_at/overload1.html" title="async_write_at (1 of 4 overloads)">async_write_at</a>(
  44     AsyncRandomAccessWriteDevice &amp; d,
  45     uint64_t offset,
  46     const ConstBufferSequence &amp; buffers,
  47     WriteHandler &amp;&amp; handler);
  48   <span class="emphasis"><em>&#187; <a class="link" href="async_write_at/overload1.html" title="async_write_at (1 of 4 overloads)">more...</a></em></span>
  49 </pre>
  50 <p>
  51         Start an asynchronous operation to write a certain amount of data at the
  52         specified offset.
  53       </p>
  54 <pre class="programlisting">template&lt;
  55     typename <a class="link" href="AsyncRandomAccessWriteDevice.html" title="Buffer-oriented asynchronous random-access write device requirements">AsyncRandomAccessWriteDevice</a>,
  56     typename <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a>,
  57     typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>,
  58     typename <a class="link" href="WriteHandler.html" title="Write handler requirements">WriteHandler</a>&gt;
  59 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="async_write_at/overload2.html" title="async_write_at (2 of 4 overloads)">async_write_at</a>(
  60     AsyncRandomAccessWriteDevice &amp; d,
  61     uint64_t offset,
  62     const ConstBufferSequence &amp; buffers,
  63     CompletionCondition completion_condition,
  64     WriteHandler &amp;&amp; handler);
  65   <span class="emphasis"><em>&#187; <a class="link" href="async_write_at/overload2.html" title="async_write_at (2 of 4 overloads)">more...</a></em></span>
  66 </pre>
  67 <p>
  68         Start an asynchronous operation to write all of the supplied data at the
  69         specified offset.
  70       </p>
  71 <pre class="programlisting">template&lt;
  72     typename <a class="link" href="AsyncRandomAccessWriteDevice.html" title="Buffer-oriented asynchronous random-access write device requirements">AsyncRandomAccessWriteDevice</a>,
  73     typename Allocator,
  74     typename <a class="link" href="WriteHandler.html" title="Write handler requirements">WriteHandler</a>&gt;
  75 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="async_write_at/overload3.html" title="async_write_at (3 of 4 overloads)">async_write_at</a>(
  76     AsyncRandomAccessWriteDevice &amp; d,
  77     uint64_t offset,
  78     basic_streambuf&lt; Allocator &gt; &amp; b,
  79     WriteHandler &amp;&amp; handler);
  80   <span class="emphasis"><em>&#187; <a class="link" href="async_write_at/overload3.html" title="async_write_at (3 of 4 overloads)">more...</a></em></span>
  81 </pre>
  82 <p>
  83         Start an asynchronous operation to write a certain amount of data at the
  84         specified offset.
  85       </p>
  86 <pre class="programlisting">template&lt;
  87     typename <a class="link" href="AsyncRandomAccessWriteDevice.html" title="Buffer-oriented asynchronous random-access write device requirements">AsyncRandomAccessWriteDevice</a>,
  88     typename Allocator,
  89     typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>,
  90     typename <a class="link" href="WriteHandler.html" title="Write handler requirements">WriteHandler</a>&gt;
  91 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <a class="link" href="async_write_at/overload4.html" title="async_write_at (4 of 4 overloads)">async_write_at</a>(
  92     AsyncRandomAccessWriteDevice &amp; d,
  93     uint64_t offset,
  94     basic_streambuf&lt; Allocator &gt; &amp; b,
  95     CompletionCondition completion_condition,
  96     WriteHandler &amp;&amp; handler);
  97   <span class="emphasis"><em>&#187; <a class="link" href="async_write_at/overload4.html" title="async_write_at (4 of 4 overloads)">more...</a></em></span>
  98 </pre>
  99 <h5>
 100 <a name="boost_asio.reference.async_write_at.h0"></a>
 101         <span class="phrase"><a name="boost_asio.reference.async_write_at.requirements"></a></span><a class="link" href="async_write_at.html#boost_asio.reference.async_write_at.requirements">Requirements</a>
 102       </h5>
 103 <p>
 104         <span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/write_at.hpp</code>
 105       </p>
 106 <p>
 107         <span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code>
 108       </p>
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