120 lines
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120 lines
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_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="boost_asio.indexterm.buffer_copy"></a>
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The <code class="computeroutput">boost::asio::buffer_copy</code>
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function is used to copy bytes from a source buffer (or buffer sequence)
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to a target 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" style="list-style-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" style="list-style-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="boost_asio.reference.buffer_copy.h0"></a>
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<span class="phrase"><a name="boost_asio.reference.buffer_copy.requirements"></a></span><a class="link" href="buffer_copy.html#boost_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">boost/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">boost/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 © 2003-2021 Christopher
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M. 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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