66 lines
4.1 KiB
HTML
66 lines
4.1 KiB
HTML
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Requirements on read and write operations</title>
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<link rel="stylesheet" href="../../boostbook.css" type="text/css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
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<link rel="home" href="../../index.html" title="Asio">
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<link rel="up" href="../reference.html" title="Reference">
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<link rel="prev" href="asynchronous_operations.html" title="Requirements on asynchronous operations">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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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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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="asynchronous_operations.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="synchronous_socket_operations.html"><img src="../../next.png" alt="Next"></a>
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</div>
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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.read_write_operations"></a><a class="link" href="read_write_operations.html" title="Requirements on read and write operations">Requirements on
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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"><span class="identifier">MutableBufferSequence</span></code></a> requirements.
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The mutable buffer sequence specifies memory where the data should be placed.
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A read operation shall always fill a buffer in the sequence completely before
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proceeding to the next.
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</p>
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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"><span class="identifier">ConstBufferSequence</span></code></a> requirements.
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The constant buffer sequence specifies memory where the data to be written
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is located. A write operation shall always write a buffer in the sequence
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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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</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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<div class="spirit-nav">
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<a accesskey="p" href="asynchronous_operations.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="synchronous_socket_operations.html"><img src="../../next.png" alt="Next"></a>
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