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<title>write_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="write/overload16.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="write_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.write_at"></a><a class="link" href="write_at.html" title="write_at">write_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.write_at"></a>
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</p>
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<p>
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The <code class="computeroutput"><span class="identifier">write_at</span></code> function is
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a composed operation that writes a certain amount of data at a specified
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offset before returning.
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</p>
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<p>
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Write all of the supplied data at the specified offset before returning.
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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="SyncRandomAccessWriteDevice.html" title="Buffer-oriented synchronous random-access write device requirements">SyncRandomAccessWriteDevice</a><span class="special">,</span>
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<span class="keyword">typename</span> <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a><span class="special">></span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="write_at/overload1.html" title="write_at (1 of 8 overloads)">write_at</a><span class="special">(</span>
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<span class="identifier">SyncRandomAccessWriteDevice</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">ConstBufferSequence</span> <span class="special">&</span> <span class="identifier">buffers</span><span class="special">);</span>
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<span class="emphasis"><em>» <a class="link" href="write_at/overload1.html" title="write_at (1 of 8 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="SyncRandomAccessWriteDevice.html" title="Buffer-oriented synchronous random-access write device requirements">SyncRandomAccessWriteDevice</a><span class="special">,</span>
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<span class="keyword">typename</span> <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a><span class="special">></span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="write_at/overload2.html" title="write_at (2 of 8 overloads)">write_at</a><span class="special">(</span>
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<span class="identifier">SyncRandomAccessWriteDevice</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">ConstBufferSequence</span> <span class="special">&</span> <span class="identifier">buffers</span><span class="special">,</span>
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<span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> <span class="identifier">ec</span><span class="special">);</span>
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<span class="emphasis"><em>» <a class="link" href="write_at/overload2.html" title="write_at (2 of 8 overloads)">more...</a></em></span>
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</pre>
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<p>
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Write a certain amount of data at a specified offset before returning.
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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="SyncRandomAccessWriteDevice.html" title="Buffer-oriented synchronous random-access write device requirements">SyncRandomAccessWriteDevice</a><span class="special">,</span>
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<span class="keyword">typename</span> <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</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="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="write_at/overload3.html" title="write_at (3 of 8 overloads)">write_at</a><span class="special">(</span>
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<span class="identifier">SyncRandomAccessWriteDevice</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">ConstBufferSequence</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="emphasis"><em>» <a class="link" href="write_at/overload3.html" title="write_at (3 of 8 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="SyncRandomAccessWriteDevice.html" title="Buffer-oriented synchronous random-access write device requirements">SyncRandomAccessWriteDevice</a><span class="special">,</span>
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<span class="keyword">typename</span> <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</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="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="write_at/overload4.html" title="write_at (4 of 8 overloads)">write_at</a><span class="special">(</span>
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<span class="identifier">SyncRandomAccessWriteDevice</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">ConstBufferSequence</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">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> <span class="identifier">ec</span><span class="special">);</span>
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<span class="emphasis"><em>» <a class="link" href="write_at/overload4.html" title="write_at (4 of 8 overloads)">more...</a></em></span>
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</pre>
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<p>
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Write all of the supplied data at the specified offset before returning.
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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="SyncRandomAccessWriteDevice.html" title="Buffer-oriented synchronous random-access write device requirements">SyncRandomAccessWriteDevice</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="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="write_at/overload5.html" title="write_at (5 of 8 overloads)">write_at</a><span class="special">(</span>
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<span class="identifier">SyncRandomAccessWriteDevice</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="emphasis"><em>» <a class="link" href="write_at/overload5.html" title="write_at (5 of 8 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="SyncRandomAccessWriteDevice.html" title="Buffer-oriented synchronous random-access write device requirements">SyncRandomAccessWriteDevice</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="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="write_at/overload6.html" title="write_at (6 of 8 overloads)">write_at</a><span class="special">(</span>
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<span class="identifier">SyncRandomAccessWriteDevice</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">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> <span class="identifier">ec</span><span class="special">);</span>
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<span class="emphasis"><em>» <a class="link" href="write_at/overload6.html" title="write_at (6 of 8 overloads)">more...</a></em></span>
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</pre>
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<p>
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Write a certain amount of data at a specified offset before returning.
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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="SyncRandomAccessWriteDevice.html" title="Buffer-oriented synchronous random-access write device requirements">SyncRandomAccessWriteDevice</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="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="write_at/overload7.html" title="write_at (7 of 8 overloads)">write_at</a><span class="special">(</span>
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<span class="identifier">SyncRandomAccessWriteDevice</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="emphasis"><em>» <a class="link" href="write_at/overload7.html" title="write_at (7 of 8 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="SyncRandomAccessWriteDevice.html" title="Buffer-oriented synchronous random-access write device requirements">SyncRandomAccessWriteDevice</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="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="write_at/overload8.html" title="write_at (8 of 8 overloads)">write_at</a><span class="special">(</span>
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<span class="identifier">SyncRandomAccessWriteDevice</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">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> <span class="identifier">ec</span><span class="special">);</span>
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<span class="emphasis"><em>» <a class="link" href="write_at/overload8.html" title="write_at (8 of 8 overloads)">more...</a></em></span>
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</pre>
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<h5>
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<a name="asio.reference.write_at.h0"></a>
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<span><a name="asio.reference.write_at.requirements"></a></span><a class="link" href="write_at.html#asio.reference.write_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/write_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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<hr>
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