88 lines
6.7 KiB
HTML
88 lines
6.7 KiB
HTML
|
<html>
|
||
|
|
<head>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
|
||
|
|
<title>buffer_cast</title>
|
||
|
|
<link rel="stylesheet" href="../../boostbook.css" type="text/css">
|
||
|
|
<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
|
||
|
|
<link rel="home" href="../../index.html" title="Asio">
|
||
|
|
<link rel="up" href="../reference.html" title="Reference">
|
||
|
|
<link rel="prev" href="buffer/overload42.html" title="buffer (42 of 42 overloads)">
|
||
|
|
<link rel="next" href="buffer_cast/overload1.html" title="buffer_cast (1 of 2 overloads)">
|
||
|
|
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||
|
|
</head>
|
||
|
|
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
|
||
|
|
<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
|
||
|
|
<hr>
|
||
|
|
<div class="spirit-nav">
|
||
|
|
<a accesskey="p" href="buffer/overload42.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="buffer_cast/overload1.html"><img src="../../next.png" alt="Next"></a>
|
||
|
|
</div>
|
||
|
|
<div class="section">
|
||
|
|
<div class="titlepage"><div><div><h3 class="title">
|
||
|
|
<a name="asio.reference.buffer_cast"></a><a class="link" href="buffer_cast.html" title="buffer_cast">buffer_cast</a>
|
||
|
|
</h3></div></div></div>
|
||
|
|
<p>
|
||
|
|
<a class="indexterm" name="asio.indexterm.buffer_cast"></a>
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
(Deprecated: Use the <code class="computeroutput"><span class="identifier">data</span><span class="special">()</span></code> member function.) The <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_cast</span></code>
|
||
|
|
function is used to obtain a pointer to the underlying memory region associated
|
||
|
|
with a buffer.
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
Cast a non-modifiable buffer to a specified pointer to POD type.
|
||
|
|
</p>
|
||
|
|
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span>
|
||
|
|
<span class="keyword">typename</span> <span class="identifier">PointerToPodType</span><span class="special">></span>
|
||
|
|
<span class="identifier">PointerToPodType</span> <a class="link" href="buffer_cast/overload1.html" title="buffer_cast (1 of 2 overloads)">buffer_cast</a><span class="special">(</span>
|
||
|
|
<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">&</span> <span class="identifier">b</span><span class="special">);</span>
|
||
|
|
<span class="emphasis"><em>» <a class="link" href="buffer_cast/overload1.html" title="buffer_cast (1 of 2 overloads)">more...</a></em></span>
|
||
|
|
|
||
|
|
<span class="keyword">template</span><span class="special"><</span>
|
||
|
|
<span class="keyword">typename</span> <span class="identifier">PointerToPodType</span><span class="special">></span>
|
||
|
|
<span class="identifier">PointerToPodType</span> <a class="link" href="buffer_cast/overload2.html" title="buffer_cast (2 of 2 overloads)">buffer_cast</a><span class="special">(</span>
|
||
|
|
<span class="keyword">const</span> <span class="identifier">const_buffer</span> <span class="special">&</span> <span class="identifier">b</span><span class="special">);</span>
|
||
|
|
<span class="emphasis"><em>» <a class="link" href="buffer_cast/overload2.html" title="buffer_cast (2 of 2 overloads)">more...</a></em></span>
|
||
|
|
</pre>
|
||
|
|
<h5>
|
||
|
|
<a name="asio.reference.buffer_cast.h0"></a>
|
||
|
|
<span><a name="asio.reference.buffer_cast.examples_"></a></span><a class="link" href="buffer_cast.html#asio.reference.buffer_cast.examples_">Examples:</a>
|
||
|
|
</h5>
|
||
|
|
<p>
|
||
|
|
To access the memory of a non-modifiable buffer, use:
|
||
|
|
</p>
|
||
|
|
<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">const_buffer</span> <span class="identifier">b1</span> <span class="special">=</span> <span class="special">...;</span>
|
||
|
|
<span class="keyword">const</span> <span class="keyword">unsigned</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">p1</span> <span class="special">=</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_cast</span><span class="special"><</span><span class="keyword">const</span> <span class="keyword">unsigned</span> <span class="keyword">char</span><span class="special">*>(</span><span class="identifier">b1</span><span class="special">);</span>
|
||
|
|
</pre>
|
||
|
|
<p>
|
||
|
|
To access the memory of a modifiable buffer, use:
|
||
|
|
</p>
|
||
|
|
<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">mutable_buffer</span> <span class="identifier">b2</span> <span class="special">=</span> <span class="special">...;</span>
|
||
|
|
<span class="keyword">unsigned</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">p2</span> <span class="special">=</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_cast</span><span class="special"><</span><span class="keyword">unsigned</span> <span class="keyword">char</span><span class="special">*>(</span><span class="identifier">b2</span><span class="special">);</span>
|
||
|
|
</pre>
|
||
|
|
<p>
|
||
|
|
The <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_cast</span></code> function permits violations
|
||
|
|
of type safety, so uses of it in application code should be carefully considered.
|
||
|
|
</p>
|
||
|
|
<h5>
|
||
|
|
<a name="asio.reference.buffer_cast.h1"></a>
|
||
|
|
<span><a name="asio.reference.buffer_cast.requirements"></a></span><a class="link" href="buffer_cast.html#asio.reference.buffer_cast.requirements">Requirements</a>
|
||
|
|
</h5>
|
||
|
|
<p>
|
||
|
|
<span class="emphasis"><em>Header: </em></span><code class="literal">asio/buffer.hpp</code>
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
<span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio.hpp</code>
|
||
|
|
</p>
|
||
|
|
</div>
|
||
|
|
<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
|
||
|
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
||
|
|
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>)
|
||
|
|
</p>
|
||
|
|
</div>
|
||
|
|
<hr>
|
||
|
|
<div class="spirit-nav">
|
||
|
|
<a accesskey="p" href="buffer/overload42.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="buffer_cast/overload1.html"><img src="../../next.png" alt="Next"></a>
|
||
|
|
</div>
|
||
|
|
</body>
|
||
|
|
</html>
|