1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>buffer_cast</title> 5<link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../boost_asio.html" title="Boost.Asio"> 8<link rel="up" href="../reference.html" title="Reference"> 9<link rel="prev" href="buffer/overload32.html" title="buffer (32 of 32 overloads)"> 10<link rel="next" href="buffer_cast/overload1.html" title="buffer_cast (1 of 2 overloads)"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> 15<td align="center"><a href="../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="buffer/overload32.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../boost_asio.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="buffer_cast/overload1.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h3 class="title"> 27<a name="boost_asio.reference.buffer_cast"></a><a class="link" href="buffer_cast.html" title="buffer_cast">buffer_cast</a> 28</h3></div></div></div> 29<p> 30 <a class="indexterm" name="boost_asio.indexterm.buffer_cast"></a> 31(Deprecated: Use the <code class="computeroutput">data()</code> 32 member function.) The <code class="computeroutput">boost::asio::buffer_cast</code> function is used 33 to obtain a pointer to the underlying memory region associated with a buffer. 34 </p> 35<p> 36 Cast a non-modifiable buffer to a specified pointer to POD type. 37 </p> 38<pre class="programlisting">template< 39 typename PointerToPodType> 40PointerToPodType <a class="link" href="buffer_cast/overload1.html" title="buffer_cast (1 of 2 overloads)">buffer_cast</a>( 41 const mutable_buffer & b); 42 <span class="emphasis"><em>» <a class="link" href="buffer_cast/overload1.html" title="buffer_cast (1 of 2 overloads)">more...</a></em></span> 43 44template< 45 typename PointerToPodType> 46PointerToPodType <a class="link" href="buffer_cast/overload2.html" title="buffer_cast (2 of 2 overloads)">buffer_cast</a>( 47 const const_buffer & b); 48 <span class="emphasis"><em>» <a class="link" href="buffer_cast/overload2.html" title="buffer_cast (2 of 2 overloads)">more...</a></em></span> 49</pre> 50<h5> 51<a name="boost_asio.reference.buffer_cast.h0"></a> 52 <span class="phrase"><a name="boost_asio.reference.buffer_cast.examples_"></a></span><a class="link" href="buffer_cast.html#boost_asio.reference.buffer_cast.examples_">Examples:</a> 53 </h5> 54<p> 55 To access the memory of a non-modifiable buffer, use: 56 </p> 57<pre class="programlisting">boost::asio::const_buffer b1 = ...; 58const unsigned char* p1 = boost::asio::buffer_cast<const unsigned char*>(b1); 59</pre> 60<p> 61 To access the memory of a modifiable buffer, use: 62 </p> 63<pre class="programlisting">boost::asio::mutable_buffer b2 = ...; 64unsigned char* p2 = boost::asio::buffer_cast<unsigned char*>(b2); 65</pre> 66<p> 67 The <code class="computeroutput">boost::asio::buffer_cast</code> function permits violations of 68 type safety, so uses of it in application code should be carefully considered. 69 </p> 70<h5> 71<a name="boost_asio.reference.buffer_cast.h1"></a> 72 <span class="phrase"><a name="boost_asio.reference.buffer_cast.requirements"></a></span><a class="link" href="buffer_cast.html#boost_asio.reference.buffer_cast.requirements">Requirements</a> 73 </h5> 74<p> 75 <span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/buffer.hpp</code> 76 </p> 77<p> 78 <span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code> 79 </p> 80</div> 81<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 82<td align="left"></td> 83<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 84 Kohlhoff<p> 85 Distributed under the Boost Software License, Version 1.0. (See accompanying 86 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>) 87 </p> 88</div></td> 89</tr></table> 90<hr> 91<div class="spirit-nav"> 92<a accesskey="p" href="buffer/overload32.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../boost_asio.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="buffer_cast/overload1.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 93</div> 94</body> 95</html> 96
