<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>buffer_copy (1 of 2 overloads)</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="../buffer_copy.html" title="buffer_copy"> <link rel="prev" href="../buffer_copy.html" title="buffer_copy"> <link rel="next" href="overload2.html" title="buffer_copy (2 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_copy.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../buffer_copy.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="overload2.html"><img src="../../../next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h4 class="title"> <a name="asio.reference.buffer_copy.overload1"></a><a class="link" href="overload1.html" title="buffer_copy (1 of 2 overloads)">buffer_copy (1 of 2 overloads)</a> </h4></div></div></div> <p> Copies bytes from a source buffer sequence to a target buffer sequence. </p> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <a class="link" href="../MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">,</span> <span class="keyword">typename</span> <a class="link" href="../ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a><span class="special">></span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">buffer_copy</span><span class="special">(</span> <span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">target</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">ConstBufferSequence</span> <span class="special">&</span> <span class="identifier">source</span><span class="special">);</span> </pre> <h6> <a name="asio.reference.buffer_copy.overload1.h0"></a> <span><a name="asio.reference.buffer_copy.overload1.parameters"></a></span><a class="link" href="overload1.html#asio.reference.buffer_copy.overload1.parameters">Parameters</a> </h6> <div class="variablelist"> <p class="title"><b></b></p> <dl> <dt><span class="term">target</span></dt> <dd><p> A modifiable buffer sequence representing the memory regions to which the bytes will be copied. </p></dd> <dt><span class="term">source</span></dt> <dd><p> A non-modifiable buffer sequence representing the memory regions from which the bytes will be copied. </p></dd> </dl> </div> <h6> <a name="asio.reference.buffer_copy.overload1.h1"></a> <span><a name="asio.reference.buffer_copy.overload1.return_value"></a></span><a class="link" href="overload1.html#asio.reference.buffer_copy.overload1.return_value">Return Value</a> </h6> <p> The number of bytes copied. </p> <h6> <a name="asio.reference.buffer_copy.overload1.h2"></a> <span><a name="asio.reference.buffer_copy.overload1.remarks"></a></span><a class="link" href="overload1.html#asio.reference.buffer_copy.overload1.remarks">Remarks</a> </h6> <p> The number of bytes copied is the lesser of: </p> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <code class="computeroutput"><span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">target</span><span class="special">)</span></code> </li> <li class="listitem"> <code class="computeroutput"><span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">source</span><span class="special">)</span></code> </li> </ul></div> <p> This function is implemented in terms of <code class="computeroutput"><span class="identifier">memcpy</span></code>, and consequently it cannot be used to copy between overlapping memory regions. </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_copy.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../buffer_copy.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="overload2.html"><img src="../../../next.png" alt="Next"></a> </div> </body> </html>