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<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.read_at"></a><a class="link" href="read_at.html" title="read_at">read_at</a>
</h3></div></div></div>
<p>
<a class="indexterm" name="idp163333504"></a>
Attempt to read a certain amount of data at the specified offset before
returning.
</p>
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a><span class="special">,</span>
<span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="read_at/overload1.html" title="read_at (1 of 8 overloads)">read_at</a><span class="special">(</span>
<span class="identifier">SyncRandomAccessReadDevice</span> <span class="special">&</span> <span class="identifier">d</span><span class="special">,</span>
<span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">buffers</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="read_at/overload1.html" title="read_at (1 of 8 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a><span class="special">,</span>
<span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="read_at/overload2.html" title="read_at (2 of 8 overloads)">read_at</a><span class="special">(</span>
<span class="identifier">SyncRandomAccessReadDevice</span> <span class="special">&</span> <span class="identifier">d</span><span class="special">,</span>
<span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">buffers</span><span class="special">,</span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> <span class="identifier">ec</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="read_at/overload2.html" title="read_at (2 of 8 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a><span class="special">,</span>
<span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">CompletionCondition</span><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="read_at/overload3.html" title="read_at (3 of 8 overloads)">read_at</a><span class="special">(</span>
<span class="identifier">SyncRandomAccessReadDevice</span> <span class="special">&</span> <span class="identifier">d</span><span class="special">,</span>
<span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">buffers</span><span class="special">,</span>
<span class="identifier">CompletionCondition</span> <span class="identifier">completion_condition</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="read_at/overload3.html" title="read_at (3 of 8 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a><span class="special">,</span>
<span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">CompletionCondition</span><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="read_at/overload4.html" title="read_at (4 of 8 overloads)">read_at</a><span class="special">(</span>
<span class="identifier">SyncRandomAccessReadDevice</span> <span class="special">&</span> <span class="identifier">d</span><span class="special">,</span>
<span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">buffers</span><span class="special">,</span>
<span class="identifier">CompletionCondition</span> <span class="identifier">completion_condition</span><span class="special">,</span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> <span class="identifier">ec</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="read_at/overload4.html" title="read_at (4 of 8 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="read_at/overload5.html" title="read_at (5 of 8 overloads)">read_at</a><span class="special">(</span>
<span class="identifier">SyncRandomAccessReadDevice</span> <span class="special">&</span> <span class="identifier">d</span><span class="special">,</span>
<span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
<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>
<span class="emphasis"><em>» <a class="link" href="read_at/overload5.html" title="read_at (5 of 8 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="read_at/overload6.html" title="read_at (6 of 8 overloads)">read_at</a><span class="special">(</span>
<span class="identifier">SyncRandomAccessReadDevice</span> <span class="special">&</span> <span class="identifier">d</span><span class="special">,</span>
<span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
<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>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> <span class="identifier">ec</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="read_at/overload6.html" title="read_at (6 of 8 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">CompletionCondition</span><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="read_at/overload7.html" title="read_at (7 of 8 overloads)">read_at</a><span class="special">(</span>
<span class="identifier">SyncRandomAccessReadDevice</span> <span class="special">&</span> <span class="identifier">d</span><span class="special">,</span>
<span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
<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>
<span class="identifier">CompletionCondition</span> <span class="identifier">completion_condition</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="read_at/overload7.html" title="read_at (7 of 8 overloads)">more...</a></em></span>
<span class="keyword">template</span><span class="special"><</span>
<span class="keyword">typename</span> <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">CompletionCondition</span><span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="read_at/overload8.html" title="read_at (8 of 8 overloads)">read_at</a><span class="special">(</span>
<span class="identifier">SyncRandomAccessReadDevice</span> <span class="special">&</span> <span class="identifier">d</span><span class="special">,</span>
<span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
<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>
<span class="identifier">CompletionCondition</span> <span class="identifier">completion_condition</span><span class="special">,</span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> <span class="identifier">ec</span><span class="special">);</span>
<span class="emphasis"><em>» <a class="link" href="read_at/overload8.html" title="read_at (8 of 8 overloads)">more...</a></em></span>
</pre>
<h5>
<a name="boost_asio.reference.read_at.h0"></a>
<span class="phrase"><a name="boost_asio.reference.read_at.requirements"></a></span><a class="link" href="read_at.html#boost_asio.reference.read_at.requirements">Requirements</a>
</h5>
<p>
<span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/read_at.hpp</code>
</p>
<p>
<span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code>
</p>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2017 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>)
</p>
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