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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.const_buffer"></a><a class="link" href="const_buffer.html" title="const_buffer">const_buffer</a>
</h3></div></div></div>
<p>
Holds a buffer that cannot be modified.
</p>
<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">const_buffer</span>
</pre>
<h5>
<a name="boost_asio.reference.const_buffer.h0"></a>
<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
Functions</a>
</h5>
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Name
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<p>
Description
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<td>
<p>
<a class="link" href="const_buffer/const_buffer.html" title="const_buffer::const_buffer"><span class="bold"><strong>const_buffer</strong></span></a>
</p>
</td>
<td>
<p>
Construct an empty buffer.
</p>
<p>
Construct a buffer to represent a given memory range.
</p>
<p>
Construct a non-modifiable buffer from a modifiable one.
</p>
</td>
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<h5>
<a name="boost_asio.reference.const_buffer.h1"></a>
<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
Functions</a>
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<td>
<p>
<a class="link" href="const_buffer/operator_plus_.html" title="const_buffer::operator+"><span class="bold"><strong>operator+</strong></span></a>
</p>
</td>
<td>
<p>
Create a new non-modifiable buffer that is offset from the start
of another.
</p>
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<p>
The <a class="link" href="const_buffer.html" title="const_buffer"><code class="computeroutput"><span class="identifier">const_buffer</span></code></a>
class provides a safe representation of a buffer that cannot be modified.
It does not own the underlying data, and so is cheap to copy or assign.
</p>
<h5>
<a name="boost_asio.reference.const_buffer.h2"></a>
<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
Buffer Contents</a>
</h5>
<p>
The contents of a buffer may be accessed using the <a class="link" href="buffer_size.html" title="buffer_size"><code class="computeroutput"><span class="identifier">buffer_size</span></code></a> and <a class="link" href="buffer_cast.html" title="buffer_cast"><code class="computeroutput"><span class="identifier">buffer_cast</span></code></a> functions:
</p>
<pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">const_buffer</span> <span class="identifier">b1</span> <span class="special">=</span> <span class="special">...;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">s1</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">b1</span><span class="special">);</span>
<span class="keyword">const</span> <span class="keyword">unsigned</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">p1</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_cast</span><span class="special"><</span><span class="keyword">const</span> <span class="keyword">unsigned</span> <span class="keyword">char</span><span class="special">*>(</span><span class="identifier">b1</span><span class="special">);</span>
</pre>
<p>
The <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_cast</span></code> function permits violations
of type safety, so uses of it in application code should be carefully considered.
</p>
<h5>
<a name="boost_asio.reference.const_buffer.h3"></a>
<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>
</h5>
<p>
<span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/buffer.hpp</code>
</p>
<p>
<span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code>
</p>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2013 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>)
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