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<p>
<a class="indexterm" name="boost_asio.indexterm.basic_streambuf.basic_streambuf"></a>
Construct
a <a class="link" href="../basic_streambuf.html" title="basic_streambuf"><code class="computeroutput">basic_streambuf</code></a>
object.
</p>
<pre class="programlisting">basic_streambuf(
std::size_t maximum_size = (std::numeric_limits&lt; std::size_t &gt;::max)(),
const Allocator &amp; allocator = Allocator());
</pre>
<p>
Constructs a streambuf with the specified maximum size. The initial size
of the streambuf's input sequence is 0.
</p>
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<p>
<a class="indexterm" name="boost_asio.indexterm.basic_streambuf.capacity"></a>
Get
the current capacity of the <a class="link" href="../basic_streambuf.html" title="basic_streambuf"><code class="computeroutput">basic_streambuf</code></a>.
</p>
<pre class="programlisting">std::size_t capacity() const;
</pre>
<h6>
<a name="boost_asio.reference.basic_streambuf.capacity.h0"></a>
<span class="phrase"><a name="boost_asio.reference.basic_streambuf.capacity.return_value"></a></span><a class="link" href="capacity.html#boost_asio.reference.basic_streambuf.capacity.return_value">Return
Value</a>
</h6>
<p>
The current total capacity of the streambuf, i.e. for both the input sequence
and output sequence.
</p>
</div>
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<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2003-2021 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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<p>
<a class="indexterm" name="boost_asio.indexterm.basic_streambuf.commit"></a>
Move characters
from the output sequence to the input sequence.
</p>
<pre class="programlisting">void commit(
std::size_t n);
</pre>
<p>
Appends <code class="computeroutput">n</code> characters from the start of the output sequence
to the input sequence. The beginning of the output sequence is advanced
by <code class="computeroutput">n</code> characters.
</p>
<p>
Requires a preceding call <code class="computeroutput">prepare(x)</code> where <code class="computeroutput">x &gt;= n</code>,
and no intervening operations that modify the input or output sequence.
</p>
<h6>
<a name="boost_asio.reference.basic_streambuf.commit.h0"></a>
<span class="phrase"><a name="boost_asio.reference.basic_streambuf.commit.remarks"></a></span><a class="link" href="commit.html#boost_asio.reference.basic_streambuf.commit.remarks">Remarks</a>
</h6>
<p>
If <code class="computeroutput">n</code> is greater than the size of the output sequence, the
entire output sequence is moved to the input sequence and no error is issued.
</p>
</div>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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<p>
<a class="indexterm" name="boost_asio.indexterm.basic_streambuf.const_buffers_type"></a>
The
type used to represent the input sequence as a list of buffers.
</p>
<pre class="programlisting">typedef implementation_defined const_buffers_type;
</pre>
<h6>
<a name="boost_asio.reference.basic_streambuf.const_buffers_type.h0"></a>
<span class="phrase"><a name="boost_asio.reference.basic_streambuf.const_buffers_type.requirements"></a></span><a class="link" href="const_buffers_type.html#boost_asio.reference.basic_streambuf.const_buffers_type.requirements">Requirements</a>
</h6>
<p>
<span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/basic_streambuf.hpp</code>
</p>
<p>
<span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code>
</p>
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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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<p>
<a class="indexterm" name="boost_asio.indexterm.basic_streambuf.consume"></a>
Remove
characters from the input sequence.
</p>
<pre class="programlisting">void consume(
std::size_t n);
</pre>
<p>
Removes <code class="computeroutput">n</code> characters from the beginning of the input sequence.
</p>
<h6>
<a name="boost_asio.reference.basic_streambuf.consume.h0"></a>
<span class="phrase"><a name="boost_asio.reference.basic_streambuf.consume.remarks"></a></span><a class="link" href="consume.html#boost_asio.reference.basic_streambuf.consume.remarks">Remarks</a>
</h6>
<p>
If <code class="computeroutput">n</code> is greater than the size of the input sequence, the entire
input sequence is consumed and no error is issued.
</p>
</div>
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<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2003-2021 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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<p>
<a class="indexterm" name="boost_asio.indexterm.basic_streambuf.data"></a>
Get a list
of buffers that represents the input sequence.
</p>
<pre class="programlisting">const_buffers_type data() const;
</pre>
<h6>
<a name="boost_asio.reference.basic_streambuf.data.h0"></a>
<span class="phrase"><a name="boost_asio.reference.basic_streambuf.data.return_value"></a></span><a class="link" href="data.html#boost_asio.reference.basic_streambuf.data.return_value">Return
Value</a>
</h6>
<p>
An object of type <code class="computeroutput">const_buffers_type</code> that satisfies ConstBufferSequence
requirements, representing all character arrays in the input sequence.
</p>
<h6>
<a name="boost_asio.reference.basic_streambuf.data.h1"></a>
<span class="phrase"><a name="boost_asio.reference.basic_streambuf.data.remarks"></a></span><a class="link" href="data.html#boost_asio.reference.basic_streambuf.data.remarks">Remarks</a>
</h6>
<p>
The returned object is invalidated by any <code class="computeroutput">basic_streambuf</code>
member function that modifies the input sequence or output sequence.
</p>
</div>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2021 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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<p>
<a class="indexterm" name="boost_asio.indexterm.basic_streambuf.max_size"></a>
Get
the maximum size of the <a class="link" href="../basic_streambuf.html" title="basic_streambuf"><code class="computeroutput">basic_streambuf</code></a>.
</p>
<pre class="programlisting">std::size_t max_size() const;
</pre>
<h6>
<a name="boost_asio.reference.basic_streambuf.max_size.h0"></a>
<span class="phrase"><a name="boost_asio.reference.basic_streambuf.max_size.return_value"></a></span><a class="link" href="max_size.html#boost_asio.reference.basic_streambuf.max_size.return_value">Return
Value</a>
</h6>
<p>
The allowed maximum of the sum of the sizes of the input sequence and output
sequence.
</p>
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<p>
<a class="indexterm" name="boost_asio.indexterm.basic_streambuf.mutable_buffers_type"></a>
The
type used to represent the output sequence as a list of buffers.
</p>
<pre class="programlisting">typedef implementation_defined mutable_buffers_type;
</pre>
<h6>
<a name="boost_asio.reference.basic_streambuf.mutable_buffers_type.h0"></a>
<span class="phrase"><a name="boost_asio.reference.basic_streambuf.mutable_buffers_type.requirements"></a></span><a class="link" href="mutable_buffers_type.html#boost_asio.reference.basic_streambuf.mutable_buffers_type.requirements">Requirements</a>
</h6>
<p>
<span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/basic_streambuf.hpp</code>
</p>
<p>
<span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code>
</p>
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<p>
<a class="indexterm" name="boost_asio.indexterm.basic_streambuf.overflow"></a>
Override
std::streambuf behaviour.
</p>
<pre class="programlisting">int_type overflow(
int_type c);
</pre>
<p>
Behaves according to the specification of <code class="computeroutput">std::streambuf::overflow()</code>,
with the specialisation that <code class="computeroutput">std::length_error</code> is thrown if
appending the character to the input sequence would require the condition
<code class="computeroutput">size() &gt; max_size()</code> to be true.
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<p>
<a class="indexterm" name="boost_asio.indexterm.basic_streambuf.prepare"></a>
Get a
list of buffers that represents the output sequence, with the given size.
</p>
<pre class="programlisting">mutable_buffers_type prepare(
std::size_t n);
</pre>
<p>
Ensures that the output sequence can accommodate <code class="computeroutput">n</code> characters,
reallocating character array objects as necessary.
</p>
<h6>
<a name="boost_asio.reference.basic_streambuf.prepare.h0"></a>
<span class="phrase"><a name="boost_asio.reference.basic_streambuf.prepare.return_value"></a></span><a class="link" href="prepare.html#boost_asio.reference.basic_streambuf.prepare.return_value">Return
Value</a>
</h6>
<p>
An object of type <code class="computeroutput">mutable_buffers_type</code> that satisfies MutableBufferSequence
requirements, representing character array objects at the start of the
output sequence such that the sum of the buffer sizes is <code class="computeroutput">n</code>.
</p>
<h6>
<a name="boost_asio.reference.basic_streambuf.prepare.h1"></a>
<span class="phrase"><a name="boost_asio.reference.basic_streambuf.prepare.exceptions"></a></span><a class="link" href="prepare.html#boost_asio.reference.basic_streambuf.prepare.exceptions">Exceptions</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term">std::length_error</span></dt>
<dd><p>
If <code class="computeroutput">size() + n &gt; max_size()</code>.
</p></dd>
</dl>
</div>
<h6>
<a name="boost_asio.reference.basic_streambuf.prepare.h2"></a>
<span class="phrase"><a name="boost_asio.reference.basic_streambuf.prepare.remarks"></a></span><a class="link" href="prepare.html#boost_asio.reference.basic_streambuf.prepare.remarks">Remarks</a>
</h6>
<p>
The returned object is invalidated by any <code class="computeroutput">basic_streambuf</code>
member function that modifies the input sequence or output sequence.
</p>
</div>
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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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<pre class="programlisting">void reserve(
std::size_t n);
</pre>
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<p>
<a class="indexterm" name="boost_asio.indexterm.basic_streambuf.size"></a>
Get the size
of the input sequence.
</p>
<pre class="programlisting">std::size_t size() const;
</pre>
<h6>
<a name="boost_asio.reference.basic_streambuf.size.h0"></a>
<span class="phrase"><a name="boost_asio.reference.basic_streambuf.size.return_value"></a></span><a class="link" href="size.html#boost_asio.reference.basic_streambuf.size.return_value">Return
Value</a>
</h6>
<p>
The size of the input sequence. The value is equal to that calculated for
<code class="computeroutput">s</code> in the following code:
</p>
<pre class="programlisting">size_t s = 0;
const_buffers_type bufs = data();
const_buffers_type::const_iterator i = bufs.begin();
while (i != bufs.end())
{
const_buffer buf(*i++);
s += buf.size();
}
</pre>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2021 Christopher
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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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<a name="boost_asio.reference.basic_streambuf.underflow"></a><a class="link" href="underflow.html" title="basic_streambuf::underflow">basic_streambuf::underflow</a>
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<p>
<a class="indexterm" name="boost_asio.indexterm.basic_streambuf.underflow"></a>
Override
std::streambuf behaviour.
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<pre class="programlisting">int_type underflow();
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Behaves according to the specification of <code class="computeroutput">std::streambuf::underflow()</code>.
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