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125 lines
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<title>Mutable buffer sequence requirements</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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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.reference.MutableBufferSequence"></a><a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">Mutable buffer
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sequence requirements</a>
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</h3></div></div></div>
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<p>
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A <span class="emphasis"><em>mutable buffer sequence</em></span> represents a set of memory
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regions that may be used to receive the output of an operation, such as the
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<code class="computeroutput"><span class="identifier">receive</span></code> operation of a socket.
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</p>
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<p>
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A type <code class="computeroutput"><span class="identifier">X</span></code> meets the <code class="computeroutput"><span class="identifier">MutableBufferSequence</span></code> requirements if it
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satisfies the requirements of <code class="computeroutput"><span class="identifier">Destructible</span></code>
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(C++Std [destructible]) and <code class="computeroutput"><span class="identifier">CopyConstructible</span></code>
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(C++Std [copyconstructible]), as well as the additional requirements listed
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below.
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</p>
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<p>
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In the table below, <code class="computeroutput"><span class="identifier">x</span></code> denotes
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a (possibly const) value of type <code class="computeroutput"><span class="identifier">X</span></code>,
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and <code class="computeroutput"><span class="identifier">u</span></code> denotes an identifier.
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</p>
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<div class="table">
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<a name="asio.reference.MutableBufferSequence.t0"></a><p class="title"><b>Table 24. MutableBufferSequence requirements</b></p>
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<div class="table-contents"><table class="table" summary="MutableBufferSequence requirements">
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<colgroup>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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expression
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</p>
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</th>
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<th>
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<p>
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return type
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</p>
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</th>
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<th>
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<p>
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assertion/note<br> pre/post-condition
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_sequence_begin</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code><br>
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<code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_sequence_end</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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An iterator type meeting the requirements for bidirectional iterators
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(C++Std [bidirectional.iterators]) whose value type is convertible
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to <code class="computeroutput"><span class="identifier">mutable_buffer</span></code>.
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</p>
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</td>
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<td>
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</td>
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</tr>
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<tr>
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<td>
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<pre class="programlisting"><span class="identifier">X</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">x</span><span class="special">);</span>
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</pre>
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</td>
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<td>
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</td>
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<td>
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<p>
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post:<br>
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</p>
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<pre class="programlisting"><span class="identifier">equal</span><span class="special">(</span>
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<span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_sequence_begin</span><span class="special">(</span><span class="identifier">x</span><span class="special">),</span>
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<span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_sequence_end</span><span class="special">(</span><span class="identifier">x</span><span class="special">),</span>
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<span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_sequence_begin</span><span class="special">(</span><span class="identifier">u</span><span class="special">),</span>
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<span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_sequence_end</span><span class="special">(</span><span class="identifier">u</span><span class="special">),</span>
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<span class="special">[](</span><span class="keyword">const</span> <span class="identifier">mutable_buffer</span><span class="special">&</span> <span class="identifier">b1</span><span class="special">,</span>
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<span class="keyword">const</span> <span class="identifier">mutable_buffer</span><span class="special">&</span> <span class="identifier">b2</span><span class="special">)</span>
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<span class="special">{</span>
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<span class="keyword">return</span> <span class="identifier">b1</span><span class="special">.</span><span class="identifier">data</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">b2</span><span class="special">.</span><span class="identifier">data</span><span class="special">()</span>
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<span class="special">&&</span> <span class="identifier">b1</span><span class="special">.</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">b2</span><span class="special">.</span><span class="identifier">size</span><span class="special">();</span>
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<span class="special">})</span>
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</pre>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<br class="table-break">
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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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