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