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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_asio.reference.const_buffer"></a><a class="link" href="const_buffer.html" title="const_buffer">const_buffer</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.const_buffer"></a>
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</p>
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<p>
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Holds a buffer that cannot be modified.
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</p>
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<pre class="programlisting">class const_buffer
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</pre>
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<h5>
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<a name="boost_asio.reference.const_buffer.h0"></a>
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<span class="phrase"><a name="boost_asio.reference.const_buffer.member_functions"></a></span><a class="link" href="const_buffer.html#boost_asio.reference.const_buffer.member_functions">Member
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Functions</a>
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</h5>
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<div class="informaltable"><table class="table">
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<colgroup>
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Name
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Description
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<a class="link" href="const_buffer/const_buffer.html" title="const_buffer::const_buffer"><span class="bold"><strong>const_buffer</strong></span></a> <span class="silver">[constructor]</span>
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</p>
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<td>
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<p>
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Construct an empty buffer. <br> <span class="silver"> —</span><br> Construct a buffer to
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represent a given memory range. <br> <span class="silver"> —</span><br> Construct a non-modifiable
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buffer from a modifiable one.
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</p>
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</td>
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<p>
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<a class="link" href="const_buffer/data.html" title="const_buffer::data"><span class="bold"><strong>data</strong></span></a>
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</p>
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</td>
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<td>
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<p>
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Get a pointer to the beginning of the memory range.
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</p>
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</td>
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<p>
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<a class="link" href="const_buffer/operator_plus__eq_.html" title="const_buffer::operator+="><span class="bold"><strong>operator+=</strong></span></a>
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</p>
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</td>
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<td>
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<p>
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Move the start of the buffer by the specified number of bytes.
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</p>
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</td>
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<p>
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<a class="link" href="const_buffer/size.html" title="const_buffer::size"><span class="bold"><strong>size</strong></span></a>
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</p>
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</td>
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<td>
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<p>
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Get the size of the memory range.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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<h5>
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<a name="boost_asio.reference.const_buffer.h1"></a>
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<span class="phrase"><a name="boost_asio.reference.const_buffer.related_functions"></a></span><a class="link" href="const_buffer.html#boost_asio.reference.const_buffer.related_functions">Related
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Functions</a>
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</h5>
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<div class="informaltable"><table class="table">
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<colgroup>
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<thead><tr>
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Description
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<p>
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<a class="link" href="const_buffer/operator_plus_.html" title="const_buffer::operator+"><span class="bold"><strong>operator+</strong></span></a>
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</p>
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</td>
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<td>
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<p>
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Create a new non-modifiable buffer that is offset from the start
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of another.
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</p>
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</td>
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</table></div>
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<p>
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The <a class="link" href="const_buffer.html" title="const_buffer"><code class="computeroutput">const_buffer</code></a>
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class provides a safe representation of a buffer that cannot be modified.
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It does not own the underlying data, and so is cheap to copy or assign.
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</p>
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<h5>
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<a name="boost_asio.reference.const_buffer.h2"></a>
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<span class="phrase"><a name="boost_asio.reference.const_buffer.accessing_buffer_contents"></a></span><a class="link" href="const_buffer.html#boost_asio.reference.const_buffer.accessing_buffer_contents">Accessing
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Buffer Contents</a>
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</h5>
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<p>
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The contents of a buffer may be accessed using the <code class="computeroutput">data()</code> and
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<code class="computeroutput">size()</code> member functions:
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</p>
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<pre class="programlisting">boost::asio::const_buffer b1 = ...;
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std::size_t s1 = b1.size();
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const unsigned char* p1 = static_cast<const unsigned char*>(b1.data());
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</pre>
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<p>
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The <code class="computeroutput">data()</code> member function permits violations of type safety,
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so uses of it in application code should be carefully considered.
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</p>
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<h5>
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<a name="boost_asio.reference.const_buffer.h3"></a>
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<span class="phrase"><a name="boost_asio.reference.const_buffer.requirements"></a></span><a class="link" href="const_buffer.html#boost_asio.reference.const_buffer.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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</p>
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