1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>buffer_copy (1 of 2 overloads)</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="../buffer_copy.html" title="buffer_copy"> 9<link rel="prev" href="../buffer_copy.html" title="buffer_copy"> 10<link rel="next" href="overload2.html" title="buffer_copy (2 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_copy.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../buffer_copy.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="overload2.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h4 class="title"> 27<a name="boost_asio.reference.buffer_copy.overload1"></a><a class="link" href="overload1.html" title="buffer_copy (1 of 2 overloads)">buffer_copy 28 (1 of 2 overloads)</a> 29</h4></div></div></div> 30<p> 31 Copies bytes from a source buffer sequence to a target buffer sequence. 32 </p> 33<pre class="programlisting">template< 34 typename <a class="link" href="../MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>, 35 typename <a class="link" href="../ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a>> 36std::size_t buffer_copy( 37 const MutableBufferSequence & target, 38 const ConstBufferSequence & source); 39</pre> 40<h6> 41<a name="boost_asio.reference.buffer_copy.overload1.h0"></a> 42 <span class="phrase"><a name="boost_asio.reference.buffer_copy.overload1.parameters"></a></span><a class="link" href="overload1.html#boost_asio.reference.buffer_copy.overload1.parameters">Parameters</a> 43 </h6> 44<div class="variablelist"> 45<p class="title"><b></b></p> 46<dl class="variablelist"> 47<dt><span class="term">target</span></dt> 48<dd><p> 49 A modifiable buffer sequence representing the memory regions to which 50 the bytes will be copied. 51 </p></dd> 52<dt><span class="term">source</span></dt> 53<dd><p> 54 A non-modifiable buffer sequence representing the memory regions 55 from which the bytes will be copied. 56 </p></dd> 57</dl> 58</div> 59<h6> 60<a name="boost_asio.reference.buffer_copy.overload1.h1"></a> 61 <span class="phrase"><a name="boost_asio.reference.buffer_copy.overload1.return_value"></a></span><a class="link" href="overload1.html#boost_asio.reference.buffer_copy.overload1.return_value">Return 62 Value</a> 63 </h6> 64<p> 65 The number of bytes copied. 66 </p> 67<h6> 68<a name="boost_asio.reference.buffer_copy.overload1.h2"></a> 69 <span class="phrase"><a name="boost_asio.reference.buffer_copy.overload1.remarks"></a></span><a class="link" href="overload1.html#boost_asio.reference.buffer_copy.overload1.remarks">Remarks</a> 70 </h6> 71<p> 72 The number of bytes copied is the lesser of: 73 </p> 74<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 75<li class="listitem"> 76 <code class="computeroutput">buffer_size(target)</code> 77 </li> 78<li class="listitem"> 79 <code class="computeroutput">buffer_size(source)</code> 80 </li> 81</ul></div> 82<p> 83 This function is implemented in terms of <code class="computeroutput">memcpy</code>, and consequently 84 it cannot be used to copy between overlapping memory regions. 85 </p> 86</div> 87<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 88<td align="left"></td> 89<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 90 Kohlhoff<p> 91 Distributed under the Boost Software License, Version 1.0. (See accompanying 92 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>) 93 </p> 94</div></td> 95</tr></table> 96<hr> 97<div class="spirit-nav"> 98<a accesskey="p" href="../buffer_copy.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../buffer_copy.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="overload2.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> 99</div> 100</body> 101</html> 102
