read_at.html
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<div class="titlepage"><div><div><h3 class="title">
<a name="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="asio.indexterm.read_at"></a>
The <code class="computeroutput">read_at</code> function is a composed
operation that reads a certain amount of data at the specified offset before
returning.
</p>
<p>
Attempt to read a certain amount of data at the specified offset before returning.
</p>
<pre class="programlisting">template<
typename <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a>,
typename <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>>
std::size_t <a class="link" href="read_at/overload1.html" title="read_at (1 of 8 overloads)">read_at</a>(
SyncRandomAccessReadDevice & d,
uint64_t offset,
const MutableBufferSequence & buffers);
<span class="emphasis"><em>» <a class="link" href="read_at/overload1.html" title="read_at (1 of 8 overloads)">more...</a></em></span>
template<
typename <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a>,
typename <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>>
std::size_t <a class="link" href="read_at/overload2.html" title="read_at (2 of 8 overloads)">read_at</a>(
SyncRandomAccessReadDevice & d,
uint64_t offset,
const MutableBufferSequence & buffers,
asio::error_code & ec);
<span class="emphasis"><em>» <a class="link" href="read_at/overload2.html" title="read_at (2 of 8 overloads)">more...</a></em></span>
template<
typename <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a>,
typename <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>,
typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>>
std::size_t <a class="link" href="read_at/overload3.html" title="read_at (3 of 8 overloads)">read_at</a>(
SyncRandomAccessReadDevice & d,
uint64_t offset,
const MutableBufferSequence & buffers,
CompletionCondition completion_condition);
<span class="emphasis"><em>» <a class="link" href="read_at/overload3.html" title="read_at (3 of 8 overloads)">more...</a></em></span>
template<
typename <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a>,
typename <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>,
typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>>
std::size_t <a class="link" href="read_at/overload4.html" title="read_at (4 of 8 overloads)">read_at</a>(
SyncRandomAccessReadDevice & d,
uint64_t offset,
const MutableBufferSequence & buffers,
CompletionCondition completion_condition,
asio::error_code & ec);
<span class="emphasis"><em>» <a class="link" href="read_at/overload4.html" title="read_at (4 of 8 overloads)">more...</a></em></span>
template<
typename <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a>,
typename Allocator>
std::size_t <a class="link" href="read_at/overload5.html" title="read_at (5 of 8 overloads)">read_at</a>(
SyncRandomAccessReadDevice & d,
uint64_t offset,
basic_streambuf< Allocator > & b);
<span class="emphasis"><em>» <a class="link" href="read_at/overload5.html" title="read_at (5 of 8 overloads)">more...</a></em></span>
template<
typename <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a>,
typename Allocator>
std::size_t <a class="link" href="read_at/overload6.html" title="read_at (6 of 8 overloads)">read_at</a>(
SyncRandomAccessReadDevice & d,
uint64_t offset,
basic_streambuf< Allocator > & b,
asio::error_code & ec);
<span class="emphasis"><em>» <a class="link" href="read_at/overload6.html" title="read_at (6 of 8 overloads)">more...</a></em></span>
template<
typename <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a>,
typename Allocator,
typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>>
std::size_t <a class="link" href="read_at/overload7.html" title="read_at (7 of 8 overloads)">read_at</a>(
SyncRandomAccessReadDevice & d,
uint64_t offset,
basic_streambuf< Allocator > & b,
CompletionCondition completion_condition);
<span class="emphasis"><em>» <a class="link" href="read_at/overload7.html" title="read_at (7 of 8 overloads)">more...</a></em></span>
template<
typename <a class="link" href="SyncRandomAccessReadDevice.html" title="Buffer-oriented synchronous random-access read device requirements">SyncRandomAccessReadDevice</a>,
typename Allocator,
typename <a class="link" href="CompletionCondition.html" title="Completion condition requirements">CompletionCondition</a>>
std::size_t <a class="link" href="read_at/overload8.html" title="read_at (8 of 8 overloads)">read_at</a>(
SyncRandomAccessReadDevice & d,
uint64_t offset,
basic_streambuf< Allocator > & b,
CompletionCondition completion_condition,
asio::error_code & ec);
<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="asio.reference.read_at.h0"></a>
<span><a name="asio.reference.read_at.requirements"></a></span><a class="link" href="read_at.html#asio.reference.read_at.requirements">Requirements</a>
</h5>
<p>
<span class="emphasis"><em>Header: </em></span><code class="literal">asio/read_at.hpp</code>
</p>
<p>
<span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio.hpp</code>
</p>
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Kohlhoff<p>
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