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<title>async_read_at</title>
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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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<a accesskey="p" href="async_read/overload8.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="async_read_at/overload1.html"><img src="../../next.png" alt="Next"></a>
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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.async_read_at"></a><a class="link" href="async_read_at.html" title="async_read_at">async_read_at</a>
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</h3></div></div></div>
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<p>
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<a class="indexterm" name="asio.indexterm.async_read_at"></a>
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</p>
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<p>
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The <code class="computeroutput"><span class="identifier">async_read_at</span></code> function
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is a composed asynchronous operation that reads a certain amount of data
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at the specified offset.
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</p>
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<p>
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Start an asynchronous operation to read a certain amount of data at the specified
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offset.
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</p>
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<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span>
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<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>
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<span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">,</span>
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<span class="keyword">typename</span> <a class="link" href="ReadToken.html" title="Read token requirements">ReadToken</a> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">></span>
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<a class="link" href="asynchronous_operations.html#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><span class="special">(</span>
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<span class="identifier">AsyncRandomAccessReadDevice</span> <span class="special">&</span> <span class="identifier">d</span><span class="special">,</span>
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<span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
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<span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">buffers</span><span class="special">,</span>
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<span class="identifier">ReadToken</span> <span class="special">&&</span> <span class="identifier">token</span> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">);</span>
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<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>
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<span class="keyword">template</span><span class="special"><</span>
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<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>
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<span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">,</span>
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<span class="keyword">typename</span> <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a><span class="special">,</span>
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<span class="keyword">typename</span> <a class="link" href="ReadToken.html" title="Read token requirements">ReadToken</a> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">></span>
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<a class="link" href="asynchronous_operations.html#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><span class="special">(</span>
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<span class="identifier">AsyncRandomAccessReadDevice</span> <span class="special">&</span> <span class="identifier">d</span><span class="special">,</span>
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<span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
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<span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">buffers</span><span class="special">,</span>
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<span class="identifier">CompletionCondition</span> <span class="identifier">completion_condition</span><span class="special">,</span>
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<span class="identifier">ReadToken</span> <span class="special">&&</span> <span class="identifier">token</span> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">);</span>
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<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>
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<span class="keyword">template</span><span class="special"><</span>
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<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>
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<span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">,</span>
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<span class="keyword">typename</span> <a class="link" href="ReadToken.html" title="Read token requirements">ReadToken</a> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">></span>
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<a class="link" href="asynchronous_operations.html#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><span class="special">(</span>
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<span class="identifier">AsyncRandomAccessReadDevice</span> <span class="special">&</span> <span class="identifier">d</span><span class="special">,</span>
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<span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
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<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>
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<span class="identifier">ReadToken</span> <span class="special">&&</span> <span class="identifier">token</span> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">);</span>
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<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>
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<span class="keyword">template</span><span class="special"><</span>
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<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>
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<span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">,</span>
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<span class="keyword">typename</span> <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a><span class="special">,</span>
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<span class="keyword">typename</span> <a class="link" href="ReadToken.html" title="Read token requirements">ReadToken</a> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">></span>
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<a class="link" href="asynchronous_operations.html#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><span class="special">(</span>
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<span class="identifier">AsyncRandomAccessReadDevice</span> <span class="special">&</span> <span class="identifier">d</span><span class="special">,</span>
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<span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
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<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>
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<span class="identifier">CompletionCondition</span> <span class="identifier">completion_condition</span><span class="special">,</span>
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<span class="identifier">ReadToken</span> <span class="special">&&</span> <span class="identifier">token</span> <span class="special">=</span> <a class="link" href="asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a><span class="special">);</span>
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<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>
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</pre>
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<h5>
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<a name="asio.reference.async_read_at.h0"></a>
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<span><a name="asio.reference.async_read_at.requirements"></a></span><a class="link" href="async_read_at.html#asio.reference.async_read_at.requirements">Requirements</a>
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</h5>
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<p>
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<span class="emphasis"><em>Header: </em></span><code class="literal">asio/read_at.hpp</code>
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</p>
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<p>
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<span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio.hpp</code>
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</p>
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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher M. 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>
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