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<title>Requirements on read and write operations</title>
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_asio.reference.read_write_operations"></a><a class="link" href="read_write_operations.html" title="Requirements on read and write operations">Requirements
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on read and write operations</a>
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</h3></div></div></div>
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<p>
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A <span class="emphasis"><em>read operation</em></span> is an operation that reads data into
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a mutable buffer sequence argument of a type meeting <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements"><code class="computeroutput">MutableBufferSequence</code></a>
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requirements. The mutable buffer sequence specifies memory where the data
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should be placed. A read operation shall always fill a buffer in the sequence
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completely before proceeding to the next.
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<p>
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A <span class="emphasis"><em>write operation</em></span> is an operation that writes data from
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a constant buffer sequence argument of a type meeting <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements"><code class="computeroutput">ConstBufferSequence</code></a>
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requirements. The constant buffer sequence specifies memory where the data
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to be written is located. A write operation shall always write a buffer in
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the sequence completely before proceeding to the next.
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</p>
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<p>
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If a read or write operation is also an <a class="link" href="asynchronous_operations.html" title="Requirements on asynchronous operations">asynchronous
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operation</a>, the operation shall maintain one or more copies of the
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buffer sequence until such time as the operation no longer requires access
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to the memory specified by the buffers in the sequence. The program shall
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ensure the memory remains valid until:
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</p>
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<p>
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— the last copy of the buffer sequence is destroyed, or
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</p>
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<p>
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— the completion handler for the asynchronous operation is invoked,
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</p>
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<p>
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whichever comes first.
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<td align="right"><div class="copyright-footer">Copyright © 2003-2021 Christopher
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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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