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<div class="titlepage"><div><div><h4 class="title">
<a name="asio.reference.posix__basic_descriptor.lowest_layer_type"></a><a class="link" href="lowest_layer_type.html" title="posix::basic_descriptor::lowest_layer_type">
posix::basic_descriptor::lowest_layer_type</a>
</h4></div></div></div>
<p>
<a class="indexterm" name="id934783"></a>
A <a class="link" href="../posix__basic_descriptor.html" title="posix::basic_descriptor"><code class="computeroutput"><span class="identifier">posix</span><span class="special">::</span><span class="identifier">basic_descriptor</span></code></a> is always the
lowest layer.
</p>
<pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">basic_descriptor</span><span class="special"><</span> <span class="identifier">DescriptorService</span> <span class="special">></span> <span class="identifier">lowest_layer_type</span><span class="special">;</span>
</pre>
<a name="asio.reference.posix__basic_descriptor.lowest_layer_type.types"></a><h6>
<a name="id934867"></a>
<a class="link" href="lowest_layer_type.html#asio.reference.posix__basic_descriptor.lowest_layer_type.types">Types</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Name
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<a class="link" href="bytes_readable.html" title="posix::basic_descriptor::bytes_readable"><span class="bold"><strong>bytes_readable</strong></span></a>
</p>
</td>
<td>
<p>
IO control command to get the amount of data that can be read without
blocking.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="implementation_type.html" title="posix::basic_descriptor::implementation_type"><span class="bold"><strong>implementation_type</strong></span></a>
</p>
</td>
<td>
<p>
The underlying implementation type of I/O object.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="lowest_layer_type.html" title="posix::basic_descriptor::lowest_layer_type"><span class="bold"><strong>lowest_layer_type</strong></span></a>
</p>
</td>
<td>
<p>
A basic_descriptor is always the lowest layer.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="native_type.html" title="posix::basic_descriptor::native_type"><span class="bold"><strong>native_type</strong></span></a>
</p>
</td>
<td>
<p>
The native representation of a descriptor.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="non_blocking_io.html" title="posix::basic_descriptor::non_blocking_io"><span class="bold"><strong>non_blocking_io</strong></span></a>
</p>
</td>
<td>
<p>
IO control command to set the blocking mode of the descriptor.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="service_type.html" title="posix::basic_descriptor::service_type"><span class="bold"><strong>service_type</strong></span></a>
</p>
</td>
<td>
<p>
The type of the service that will be used to provide I/O operations.
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="asio.reference.posix__basic_descriptor.lowest_layer_type.member_functions"></a><h6>
<a name="id935080"></a>
<a class="link" href="lowest_layer_type.html#asio.reference.posix__basic_descriptor.lowest_layer_type.member_functions">Member
Functions</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Name
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<a class="link" href="assign.html" title="posix::basic_descriptor::assign"><span class="bold"><strong>assign</strong></span></a>
</p>
</td>
<td>
<p>
Assign an existing native descriptor to the descriptor.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="basic_descriptor.html" title="posix::basic_descriptor::basic_descriptor"><span class="bold"><strong>basic_descriptor</strong></span></a>
</p>
</td>
<td>
<p>
Construct a basic_descriptor without opening it.
</p>
<p>
Construct a basic_descriptor on an existing native descriptor.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="cancel.html" title="posix::basic_descriptor::cancel"><span class="bold"><strong>cancel</strong></span></a>
</p>
</td>
<td>
<p>
Cancel all asynchronous operations associated with the descriptor.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="close.html" title="posix::basic_descriptor::close"><span class="bold"><strong>close</strong></span></a>
</p>
</td>
<td>
<p>
Close the descriptor.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="get_io_service.html" title="posix::basic_descriptor::get_io_service"><span class="bold"><strong>get_io_service</strong></span></a>
</p>
</td>
<td>
<p>
Get the io_service associated with the object.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="io_control.html" title="posix::basic_descriptor::io_control"><span class="bold"><strong>io_control</strong></span></a>
</p>
</td>
<td>
<p>
Perform an IO control command on the descriptor.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="io_service.html" title="posix::basic_descriptor::io_service"><span class="bold"><strong>io_service</strong></span></a>
</p>
</td>
<td>
<p>
(Deprecated: use get_io_service().) Get the io_service associated
with the object.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="is_open.html" title="posix::basic_descriptor::is_open"><span class="bold"><strong>is_open</strong></span></a>
</p>
</td>
<td>
<p>
Determine whether the descriptor is open.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="lowest_layer.html" title="posix::basic_descriptor::lowest_layer"><span class="bold"><strong>lowest_layer</strong></span></a>
</p>
</td>
<td>
<p>
Get a reference to the lowest layer.
</p>
<p>
Get a const reference to the lowest layer.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="native.html" title="posix::basic_descriptor::native"><span class="bold"><strong>native</strong></span></a>
</p>
</td>
<td>
<p>
Get the native descriptor representation.
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="asio.reference.posix__basic_descriptor.lowest_layer_type.protected_member_functions"></a><h6>
<a name="id935405"></a>
<a class="link" href="lowest_layer_type.html#asio.reference.posix__basic_descriptor.lowest_layer_type.protected_member_functions">Protected
Member Functions</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Name
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<a class="link" href="_basic_descriptor.html" title="posix::basic_descriptor::~basic_descriptor"><span class="bold"><strong>~basic_descriptor</strong></span></a>
</p>
</td>
<td>
<p>
Protected destructor to prevent deletion through this type.
</p>
</td>
</tr></tbody>
</table></div>
<a name="asio.reference.posix__basic_descriptor.lowest_layer_type.protected_data_members"></a><h6>
<a name="id935487"></a>
<a class="link" href="lowest_layer_type.html#asio.reference.posix__basic_descriptor.lowest_layer_type.protected_data_members">Protected
Data Members</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Name
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<a class="link" href="implementation.html" title="posix::basic_descriptor::implementation"><span class="bold"><strong>implementation</strong></span></a>
</p>
</td>
<td>
<p>
The underlying implementation of the I/O object.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="service.html" title="posix::basic_descriptor::service"><span class="bold"><strong>service</strong></span></a>
</p>
</td>
<td>
<p>
The service associated with the I/O object.
</p>
</td>
</tr>
</tbody>
</table></div>
<p>
The <a class="link" href="../posix__basic_descriptor.html" title="posix::basic_descriptor"><code class="computeroutput"><span class="identifier">posix</span><span class="special">::</span><span class="identifier">basic_descriptor</span></code></a> class template
provides the ability to wrap a POSIX descriptor.
</p>
<a name="asio.reference.posix__basic_descriptor.lowest_layer_type.thread_safety"></a><h6>
<a name="id935620"></a>
<a class="link" href="lowest_layer_type.html#asio.reference.posix__basic_descriptor.lowest_layer_type.thread_safety">Thread
Safety</a>
</h6>
<p>
<span class="bold"><strong>Distinct</strong></span> <span class="bold"><strong>objects:</strong></span>
Safe.
</p>
<p>
<span class="bold"><strong>Shared</strong></span> <span class="bold"><strong>objects:</strong></span>
Unsafe.
</p>
<a name="asio.reference.posix__basic_descriptor.lowest_layer_type.requirements"></a><h6>
<a name="id935670"></a>
<a class="link" href="lowest_layer_type.html#asio.reference.posix__basic_descriptor.lowest_layer_type.requirements">Requirements</a>
</h6>
<p>
<span class="bold"><strong>Header: </strong></span><code class="literal">asio/posix/basic_descriptor.hpp</code>
</p>
<p>
<span class="bold"><strong>Convenience header: </strong></span><code class="literal">asio.hpp</code>
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2003 - 2010 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>)
</p>
</div></td>
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