Adds asio library and Storage Module
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>buffer_copy</title>
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<link rel="stylesheet" href="../../boostbook.css" type="text/css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
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<link rel="home" href="../../index.html" title="Asio">
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<link rel="up" href="../reference.html" title="Reference">
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<link rel="prev" href="buffer_cast/overload2.html" title="buffer_cast (2 of 2 overloads)">
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<link rel="next" href="buffer_copy/overload1.html" title="buffer_copy (1 of 2 overloads)">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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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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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="buffer_cast/overload2.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_copy/overload1.html"><img src="../../next.png" alt="Next"></a>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.reference.buffer_copy"></a><a class="link" href="buffer_copy.html" title="buffer_copy">buffer_copy</a>
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</h3></div></div></div>
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<p>
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<a class="indexterm" name="asio.indexterm.buffer_copy"></a>
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The <code class="computeroutput">asio::buffer_copy</code> function
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is used to copy bytes from a source buffer (or buffer sequence) to a target
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buffer (or buffer sequence).
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</p>
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<p>
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Copies bytes from a source buffer sequence to a target buffer sequence.
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</p>
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<pre class="programlisting">template<
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typename <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>,
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typename <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a>>
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std::size_t <a class="link" href="buffer_copy/overload1.html" title="buffer_copy (1 of 2 overloads)">buffer_copy</a>(
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const MutableBufferSequence & target,
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const ConstBufferSequence & source);
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<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload1.html" title="buffer_copy (1 of 2 overloads)">more...</a></em></span>
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</pre>
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<p>
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Copies a limited number of bytes from a source buffer sequence to a target
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buffer sequence.
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</p>
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<pre class="programlisting">template<
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typename <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>,
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typename <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a>>
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std::size_t <a class="link" href="buffer_copy/overload2.html" title="buffer_copy (2 of 2 overloads)">buffer_copy</a>(
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const MutableBufferSequence & target,
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const ConstBufferSequence & source,
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std::size_t max_bytes_to_copy);
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<span class="emphasis"><em>» <a class="link" href="buffer_copy/overload2.html" title="buffer_copy (2 of 2 overloads)">more...</a></em></span>
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</pre>
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<p>
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The <code class="computeroutput">buffer_copy</code> function is available in two forms:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem">
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A 2-argument form: <code class="computeroutput">buffer_copy(target, source)</code>
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</li>
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<li class="listitem">
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A 3-argument form: <code class="computeroutput">buffer_copy(target, source, max_bytes_to_copy)</code>
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</li>
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</ul></div>
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<p>
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Both forms return the number of bytes actually copied. The number of bytes
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copied is the lesser of:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem">
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<code class="computeroutput">buffer_size(target)</code>
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</li>
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<li class="listitem">
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<code class="computeroutput">buffer_size(source)</code>
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</li>
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<li class="listitem">
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<code class="computeroutput">If</code> specified, <code class="computeroutput">max_bytes_to_copy</code>.
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</li>
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</ul></div>
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<p>
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This prevents buffer overflow, regardless of the buffer sizes used in the
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copy operation.
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</p>
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<p>
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Note that <a class="link" href="buffer_copy.html" title="buffer_copy"><code class="computeroutput">buffer_copy</code></a>
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is implemented in terms of <code class="computeroutput">memcpy</code>, and consequently it cannot
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be used to copy between overlapping memory regions.
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</p>
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<h5>
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<a name="asio.reference.buffer_copy.h0"></a>
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<span><a name="asio.reference.buffer_copy.requirements"></a></span><a class="link" href="buffer_copy.html#asio.reference.buffer_copy.requirements">Requirements</a>
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</h5>
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<p>
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<span class="emphasis"><em>Header: </em></span><code class="literal">asio/buffer.hpp</code>
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</p>
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<p>
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<span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio.hpp</code>
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</p>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M.
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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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</div></td>
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</tr></table>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="buffer_cast/overload2.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_copy/overload1.html"><img src="../../next.png" alt="Next"></a>
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</div>
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</body>
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