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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>
30 <a class="indexterm" name="idp117186704"></a>
31 Start an asynchronous operation to read a certain amount of
32 data at the specified offset.
34 <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span>
35 <span class="keyword">typename</span> <a class="link" href="AsyncRandomAccessReadDevice.html" title="Buffer-oriented asynchronous random-access read device requirements">AsyncRandomAccessReadDevice</a><span class="special">,</span>
36 <span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">,</span>
37 <span class="keyword">typename</span> <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a><span class="special">></span>
38 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.return_type_of_an_initiating_function"><span class="emphasis"><em>void-or-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><span class="special">(</span>
39 <span class="identifier">AsyncRandomAccessReadDevice</span> <span class="special">&</span> <span class="identifier">d</span><span class="special">,</span>
40 <span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
41 <span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">buffers</span><span class="special">,</span>
42 <span class="identifier">ReadHandler</span> <span class="identifier">handler</span><span class="special">);</span>
43 <span class="emphasis"><em>» <a class="link" href="async_read_at/overload1.html" title="async_read_at (1 of 4 overloads)">more...</a></em></span>
45 <span class="keyword">template</span><span class="special"><</span>
46 <span class="keyword">typename</span> <a class="link" href="AsyncRandomAccessReadDevice.html" title="Buffer-oriented asynchronous random-access read device requirements">AsyncRandomAccessReadDevice</a><span class="special">,</span>
47 <span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">,</span>
48 <span class="keyword">typename</span> <span class="identifier">CompletionCondition</span><span class="special">,</span>
49 <span class="keyword">typename</span> <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a><span class="special">></span>
50 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.return_type_of_an_initiating_function"><span class="emphasis"><em>void-or-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><span class="special">(</span>
51 <span class="identifier">AsyncRandomAccessReadDevice</span> <span class="special">&</span> <span class="identifier">d</span><span class="special">,</span>
52 <span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
53 <span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">buffers</span><span class="special">,</span>
54 <span class="identifier">CompletionCondition</span> <span class="identifier">completion_condition</span><span class="special">,</span>
55 <span class="identifier">ReadHandler</span> <span class="identifier">handler</span><span class="special">);</span>
56 <span class="emphasis"><em>» <a class="link" href="async_read_at/overload2.html" title="async_read_at (2 of 4 overloads)">more...</a></em></span>
58 <span class="keyword">template</span><span class="special"><</span>
59 <span class="keyword">typename</span> <a class="link" href="AsyncRandomAccessReadDevice.html" title="Buffer-oriented asynchronous random-access read device requirements">AsyncRandomAccessReadDevice</a><span class="special">,</span>
60 <span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">,</span>
61 <span class="keyword">typename</span> <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a><span class="special">></span>
62 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.return_type_of_an_initiating_function"><span class="emphasis"><em>void-or-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><span class="special">(</span>
63 <span class="identifier">AsyncRandomAccessReadDevice</span> <span class="special">&</span> <span class="identifier">d</span><span class="special">,</span>
64 <span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
65 <span class="identifier">basic_streambuf</span><span class="special"><</span> <span class="identifier">Allocator</span> <span class="special">></span> <span class="special">&</span> <span class="identifier">b</span><span class="special">,</span>
66 <span class="identifier">ReadHandler</span> <span class="identifier">handler</span><span class="special">);</span>
67 <span class="emphasis"><em>» <a class="link" href="async_read_at/overload3.html" title="async_read_at (3 of 4 overloads)">more...</a></em></span>
69 <span class="keyword">template</span><span class="special"><</span>
70 <span class="keyword">typename</span> <a class="link" href="AsyncRandomAccessReadDevice.html" title="Buffer-oriented asynchronous random-access read device requirements">AsyncRandomAccessReadDevice</a><span class="special">,</span>
71 <span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">,</span>
72 <span class="keyword">typename</span> <span class="identifier">CompletionCondition</span><span class="special">,</span>
73 <span class="keyword">typename</span> <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a><span class="special">></span>
74 <a class="link" href="asynchronous_operations.html#boost_asio.reference.asynchronous_operations.return_type_of_an_initiating_function"><span class="emphasis"><em>void-or-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><span class="special">(</span>
75 <span class="identifier">AsyncRandomAccessReadDevice</span> <span class="special">&</span> <span class="identifier">d</span><span class="special">,</span>
76 <span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
77 <span class="identifier">basic_streambuf</span><span class="special"><</span> <span class="identifier">Allocator</span> <span class="special">></span> <span class="special">&</span> <span class="identifier">b</span><span class="special">,</span>
78 <span class="identifier">CompletionCondition</span> <span class="identifier">completion_condition</span><span class="special">,</span>
79 <span class="identifier">ReadHandler</span> <span class="identifier">handler</span><span class="special">);</span>
80 <span class="emphasis"><em>» <a class="link" href="async_read_at/overload4.html" title="async_read_at (4 of 4 overloads)">more...</a></em></span>
83 <a name="boost_asio.reference.async_read_at.h0"></a>
84 <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>
87 <span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/read_at.hpp</code>
90 <span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code>
93 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
94 <td align="left"></td>
95 <td align="right"><div class="copyright-footer">Copyright © 2003-2014 Christopher M. Kohlhoff<p>
96 Distributed under the Boost Software License, Version 1.0. (See accompanying
97 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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