Adds asio library and Storage Module

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Suraxius committed 2020-12-01 22:41:04 +01:00
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<p>
<a class="indexterm" name="asio.indexterm.execution_context._execution_context"></a>
Destructor.
</p>
<pre class="programlisting">~execution_context();
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2020 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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</h4></div></div></div>
<p>
<a class="indexterm" name="asio.indexterm.execution_context.add_service"></a>
(Deprecated:
Use <code class="computeroutput">make_service()</code>.) Add a service object to the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>.
</p>
<pre class="programlisting">template&lt;
typename <a class="link" href="../Service.html" title="Service requirements">Service</a>&gt;
friend void add_service(
execution_context &amp; e,
Service * svc);
</pre>
<p>
This function is used to add a service to the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>.
</p>
<h6>
<a name="asio.reference.execution_context.add_service.h0"></a>
<span><a name="asio.reference.execution_context.add_service.parameters"></a></span><a class="link" href="add_service.html#asio.reference.execution_context.add_service.parameters">Parameters</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">e</span></dt>
<dd><p>
The <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
object that owns the service.
</p></dd>
<dt><span class="term">svc</span></dt>
<dd>
<p>
The service object. On success, ownership of the service object is
transferred to the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>.
When the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
object is destroyed, it will destroy the service object by performing:
</p>
<pre class="programlisting">delete static_cast&lt;execution_context::service*&gt;(svc)
</pre>
<p>
</p>
</dd>
</dl>
</div>
<h6>
<a name="asio.reference.execution_context.add_service.h1"></a>
<span><a name="asio.reference.execution_context.add_service.exceptions"></a></span><a class="link" href="add_service.html#asio.reference.execution_context.add_service.exceptions">Exceptions</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">asio::service_already_exists</span></dt>
<dd><p>
Thrown if a service of the given type is already present in the
<a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>.
</p></dd>
<dt><span class="term">asio::invalid_service_owner</span></dt>
<dd><p>
Thrown if the service's owning <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
is not the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
object specified by the <code class="computeroutput">e</code> parameter.
</p></dd>
</dl>
</div>
<h6>
<a name="asio.reference.execution_context.add_service.h2"></a>
<span><a name="asio.reference.execution_context.add_service.requirements"></a></span><a class="link" href="add_service.html#asio.reference.execution_context.add_service.requirements">Requirements</a>
</h6>
<p>
<span class="emphasis"><em>Header: </em></span><code class="literal">asio/execution_context.hpp</code>
</p>
<p>
<span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio/execution.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 © 2003-2020 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>
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<a name="asio.reference.execution_context.destroy"></a><a class="link" href="destroy.html" title="execution_context::destroy">execution_context::destroy</a>
</h4></div></div></div>
<p>
<a class="indexterm" name="asio.indexterm.execution_context.destroy"></a>
Destroys
all services in the context.
</p>
<pre class="programlisting">void destroy();
</pre>
<p>
This function is implemented as follows:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
For each service object <code class="computeroutput">svc</code> in the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
set, in reverse order * of the beginning of service object lifetime,
performs <code class="computeroutput">delete static_cast&lt;execution_context::service*&gt;(svc)</code>.
</li></ul></div>
</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 © 2003-2020 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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</h4></div></div></div>
<p>
<a class="indexterm" name="asio.indexterm.execution_context.execution_context"></a>
Constructor.
</p>
<pre class="programlisting">execution_context();
</pre>
</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 © 2003-2020 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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<a name="asio.reference.execution_context.fork_event"></a><a class="link" href="fork_event.html" title="execution_context::fork_event">execution_context::fork_event</a>
</h4></div></div></div>
<p>
<a class="indexterm" name="asio.indexterm.execution_context.fork_event"></a>
Fork-related
event notifications.
</p>
<pre class="programlisting">enum fork_event
</pre>
<p>
<a class="indexterm" name="asio.indexterm.execution_context.fork_event.fork_prepare"></a>
<a class="indexterm" name="asio.indexterm.execution_context.fork_event.fork_parent"></a>
<a class="indexterm" name="asio.indexterm.execution_context.fork_event.fork_child"></a>
</p>
<h6>
<a name="asio.reference.execution_context.fork_event.h0"></a>
<span><a name="asio.reference.execution_context.fork_event.values"></a></span><a class="link" href="fork_event.html#asio.reference.execution_context.fork_event.values">Values</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">fork_prepare</span></dt>
<dd><p>
Notify the context that the process is about to fork.
</p></dd>
<dt><span class="term">fork_parent</span></dt>
<dd><p>
Notify the context that the process has forked and is the parent.
</p></dd>
<dt><span class="term">fork_child</span></dt>
<dd><p>
Notify the context that the process has forked and is the child.
</p></dd>
</dl>
</div>
</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 © 2003-2020 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>
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<a name="asio.reference.execution_context.has_service"></a><a class="link" href="has_service.html" title="execution_context::has_service">execution_context::has_service</a>
</h4></div></div></div>
<p>
<a class="indexterm" name="asio.indexterm.execution_context.has_service"></a>
Determine
if an <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
contains a specified service type.
</p>
<pre class="programlisting">template&lt;
typename <a class="link" href="../Service.html" title="Service requirements">Service</a>&gt;
friend bool has_service(
execution_context &amp; e);
</pre>
<p>
This function is used to determine whether the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
contains a service object corresponding to the given service type.
</p>
<h6>
<a name="asio.reference.execution_context.has_service.h0"></a>
<span><a name="asio.reference.execution_context.has_service.parameters"></a></span><a class="link" href="has_service.html#asio.reference.execution_context.has_service.parameters">Parameters</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">e</span></dt>
<dd><p>
The <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
object that owns the service.
</p></dd>
</dl>
</div>
<h6>
<a name="asio.reference.execution_context.has_service.h1"></a>
<span><a name="asio.reference.execution_context.has_service.return_value"></a></span><a class="link" href="has_service.html#asio.reference.execution_context.has_service.return_value">Return
Value</a>
</h6>
<p>
A boolean indicating whether the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
contains the service.
</p>
<h6>
<a name="asio.reference.execution_context.has_service.h2"></a>
<span><a name="asio.reference.execution_context.has_service.requirements"></a></span><a class="link" href="has_service.html#asio.reference.execution_context.has_service.requirements">Requirements</a>
</h6>
<p>
<span class="emphasis"><em>Header: </em></span><code class="literal">asio/execution_context.hpp</code>
</p>
<p>
<span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio/execution.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 © 2003-2020 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>
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</h4></div></div></div>
<p>
<a class="indexterm" name="asio.indexterm.execution_context.make_service"></a>
Creates
a service object and adds it to the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>.
</p>
<pre class="programlisting">template&lt;
typename <a class="link" href="../Service.html" title="Service requirements">Service</a>,
typename... Args&gt;
friend Service &amp; make_service(
execution_context &amp; e,
Args &amp;&amp;... args);
</pre>
<p>
This function is used to add a service to the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>.
</p>
<h6>
<a name="asio.reference.execution_context.make_service.h0"></a>
<span><a name="asio.reference.execution_context.make_service.parameters"></a></span><a class="link" href="make_service.html#asio.reference.execution_context.make_service.parameters">Parameters</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">e</span></dt>
<dd><p>
The <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
object that owns the service.
</p></dd>
<dt><span class="term">args</span></dt>
<dd><p>
Zero or more arguments to be passed to the service constructor.
</p></dd>
</dl>
</div>
<h6>
<a name="asio.reference.execution_context.make_service.h1"></a>
<span><a name="asio.reference.execution_context.make_service.exceptions"></a></span><a class="link" href="make_service.html#asio.reference.execution_context.make_service.exceptions">Exceptions</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">asio::service_already_exists</span></dt>
<dd><p>
Thrown if a service of the given type is already present in the
<a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>.
</p></dd>
</dl>
</div>
<h6>
<a name="asio.reference.execution_context.make_service.h2"></a>
<span><a name="asio.reference.execution_context.make_service.requirements"></a></span><a class="link" href="make_service.html#asio.reference.execution_context.make_service.requirements">Requirements</a>
</h6>
<p>
<span class="emphasis"><em>Header: </em></span><code class="literal">asio/execution_context.hpp</code>
</p>
<p>
<span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio/execution.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 © 2003-2020 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>
</tr></table>
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<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>execution_context::notify_fork</title>
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<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="asio.reference.execution_context.notify_fork"></a><a class="link" href="notify_fork.html" title="execution_context::notify_fork">execution_context::notify_fork</a>
</h4></div></div></div>
<p>
<a class="indexterm" name="asio.indexterm.execution_context.notify_fork"></a>
Notify
the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
of a fork-related event.
</p>
<pre class="programlisting">void notify_fork(
fork_event event);
</pre>
<p>
This function is used to inform the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
that the process is about to fork, or has just forked. This allows the
<a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>,
and the services it contains, to perform any necessary housekeeping to
ensure correct operation following a fork.
</p>
<p>
This function must not be called while any other <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
function, or any function associated with the execution_context's derived
class, is being called in another thread. It is, however, safe to call
this function from within a completion handler, provided no other thread
is accessing the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
or its derived class.
</p>
<h6>
<a name="asio.reference.execution_context.notify_fork.h0"></a>
<span><a name="asio.reference.execution_context.notify_fork.parameters"></a></span><a class="link" href="notify_fork.html#asio.reference.execution_context.notify_fork.parameters">Parameters</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">event</span></dt>
<dd><p>
A fork-related event.
</p></dd>
</dl>
</div>
<h6>
<a name="asio.reference.execution_context.notify_fork.h1"></a>
<span><a name="asio.reference.execution_context.notify_fork.exceptions"></a></span><a class="link" href="notify_fork.html#asio.reference.execution_context.notify_fork.exceptions">Exceptions</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">asio::system_error</span></dt>
<dd><p>
Thrown on failure. If the notification fails the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
object should no longer be used and should be destroyed.
</p></dd>
</dl>
</div>
<h6>
<a name="asio.reference.execution_context.notify_fork.h2"></a>
<span><a name="asio.reference.execution_context.notify_fork.example"></a></span><a class="link" href="notify_fork.html#asio.reference.execution_context.notify_fork.example">Example</a>
</h6>
<p>
The following code illustrates how to incorporate the <code class="computeroutput">notify_fork()</code>
function:
</p>
<pre class="programlisting">my_execution_context.notify_fork(execution_context::fork_prepare);
if (fork() == 0)
{
// This is the child process.
my_execution_context.notify_fork(execution_context::fork_child);
}
else
{
// This is the parent process.
my_execution_context.notify_fork(execution_context::fork_parent);
}
</pre>
<h6>
<a name="asio.reference.execution_context.notify_fork.h3"></a>
<span><a name="asio.reference.execution_context.notify_fork.remarks"></a></span><a class="link" href="notify_fork.html#asio.reference.execution_context.notify_fork.remarks">Remarks</a>
</h6>
<p>
For each service object <code class="computeroutput">svc</code> in the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
set, performs <code class="computeroutput">svc-&gt;notify_fork();</code>. When processing the
fork_prepare event, services are visited in reverse order of the beginning
of service object lifetime. Otherwise, services are visited in order of
the beginning of service object lifetime.
</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 © 2003-2020 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>
</tr></table>
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<html>
<head>
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<title>execution_context::shutdown</title>
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</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="asio.reference.execution_context.shutdown"></a><a class="link" href="shutdown.html" title="execution_context::shutdown">execution_context::shutdown</a>
</h4></div></div></div>
<p>
<a class="indexterm" name="asio.indexterm.execution_context.shutdown"></a>
Shuts
down all services in the context.
</p>
<pre class="programlisting">void shutdown();
</pre>
<p>
This function is implemented as follows:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
For each service object <code class="computeroutput">svc</code> in the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
set, in reverse order of the beginning of service object lifetime,
performs <code class="computeroutput">svc-&gt;shutdown()</code>.
</li></ul></div>
</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 © 2003-2020 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>
</tr></table>
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<div class="spirit-nav">
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>execution_context::use_service</title>
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</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="asio.reference.execution_context.use_service"></a><a class="link" href="use_service.html" title="execution_context::use_service">execution_context::use_service</a>
</h4></div></div></div>
<p>
<a class="indexterm" name="asio.indexterm.execution_context.use_service"></a>
Obtain
the service object corresponding to the given type.
</p>
<pre class="programlisting">template&lt;
typename <a class="link" href="../Service.html" title="Service requirements">Service</a>&gt;
friend Service &amp; <a class="link" href="use_service/overload1.html" title="execution_context::use_service (1 of 2 overloads)">use_service</a>(
execution_context &amp; e);
<span class="emphasis"><em>» <a class="link" href="use_service/overload1.html" title="execution_context::use_service (1 of 2 overloads)">more...</a></em></span>
template&lt;
typename <a class="link" href="../Service.html" title="Service requirements">Service</a>&gt;
friend Service &amp; <a class="link" href="use_service/overload2.html" title="execution_context::use_service (2 of 2 overloads)">use_service</a>(
io_context &amp; ioc);
<span class="emphasis"><em>» <a class="link" href="use_service/overload2.html" title="execution_context::use_service (2 of 2 overloads)">more...</a></em></span>
</pre>
</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 © 2003-2020 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>
</tr></table>
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<head>
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</div>
<div class="section">
<div class="titlepage"><div><div><h5 class="title">
<a name="asio.reference.execution_context.use_service.overload1"></a><a class="link" href="overload1.html" title="execution_context::use_service (1 of 2 overloads)">execution_context::use_service
(1 of 2 overloads)</a>
</h5></div></div></div>
<p>
Obtain the service object corresponding to the given type.
</p>
<pre class="programlisting">template&lt;
typename <a class="link" href="../../Service.html" title="Service requirements">Service</a>&gt;
friend Service &amp; use_service(
execution_context &amp; e);
</pre>
<p>
This function is used to locate a service object that corresponds to
the given service type. If there is no existing implementation of the
service, then the <a class="link" href="../../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
will create a new instance of the service.
</p>
<h6>
<a name="asio.reference.execution_context.use_service.overload1.h0"></a>
<span><a name="asio.reference.execution_context.use_service.overload1.parameters"></a></span><a class="link" href="overload1.html#asio.reference.execution_context.use_service.overload1.parameters">Parameters</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">e</span></dt>
<dd><p>
The <a class="link" href="../../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
object that owns the service.
</p></dd>
</dl>
</div>
<h6>
<a name="asio.reference.execution_context.use_service.overload1.h1"></a>
<span><a name="asio.reference.execution_context.use_service.overload1.return_value"></a></span><a class="link" href="overload1.html#asio.reference.execution_context.use_service.overload1.return_value">Return
Value</a>
</h6>
<p>
The service interface implementing the specified service type. Ownership
of the service interface is not transferred to the caller.
</p>
<h6>
<a name="asio.reference.execution_context.use_service.overload1.h2"></a>
<span><a name="asio.reference.execution_context.use_service.overload1.requirements"></a></span><a class="link" href="overload1.html#asio.reference.execution_context.use_service.overload1.requirements">Requirements</a>
</h6>
<p>
<span class="emphasis"><em>Header: </em></span><code class="literal">asio/execution_context.hpp</code>
</p>
<p>
<span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio/execution.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 © 2003-2020 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>
</tr></table>
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@@ -0,0 +1,93 @@
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</div>
<div class="section">
<div class="titlepage"><div><div><h5 class="title">
<a name="asio.reference.execution_context.use_service.overload2"></a><a class="link" href="overload2.html" title="execution_context::use_service (2 of 2 overloads)">execution_context::use_service
(2 of 2 overloads)</a>
</h5></div></div></div>
<p>
Obtain the service object corresponding to the given type.
</p>
<pre class="programlisting">template&lt;
typename <a class="link" href="../../Service.html" title="Service requirements">Service</a>&gt;
friend Service &amp; use_service(
io_context &amp; ioc);
</pre>
<p>
This function is used to locate a service object that corresponds to
the given service type. If there is no existing implementation of the
service, then the <a class="link" href="../../io_context.html" title="io_context"><code class="computeroutput">io_context</code></a>
will create a new instance of the service.
</p>
<h6>
<a name="asio.reference.execution_context.use_service.overload2.h0"></a>
<span><a name="asio.reference.execution_context.use_service.overload2.parameters"></a></span><a class="link" href="overload2.html#asio.reference.execution_context.use_service.overload2.parameters">Parameters</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">ioc</span></dt>
<dd><p>
The <a class="link" href="../../io_context.html" title="io_context"><code class="computeroutput">io_context</code></a>
object that owns the service.
</p></dd>
</dl>
</div>
<h6>
<a name="asio.reference.execution_context.use_service.overload2.h1"></a>
<span><a name="asio.reference.execution_context.use_service.overload2.return_value"></a></span><a class="link" href="overload2.html#asio.reference.execution_context.use_service.overload2.return_value">Return
Value</a>
</h6>
<p>
The service interface implementing the specified service type. Ownership
of the service interface is not transferred to the caller.
</p>
<h6>
<a name="asio.reference.execution_context.use_service.overload2.h2"></a>
<span><a name="asio.reference.execution_context.use_service.overload2.remarks"></a></span><a class="link" href="overload2.html#asio.reference.execution_context.use_service.overload2.remarks">Remarks</a>
</h6>
<p>
This overload is preserved for backwards compatibility with services
that inherit from <a class="link" href="../../io_context__service.html" title="io_context::service"><code class="computeroutput">io_context::service</code></a>.
</p>
<h6>
<a name="asio.reference.execution_context.use_service.overload2.h3"></a>
<span><a name="asio.reference.execution_context.use_service.overload2.requirements"></a></span><a class="link" href="overload2.html#asio.reference.execution_context.use_service.overload2.requirements">Requirements</a>
</h6>
<p>
<span class="emphasis"><em>Header: </em></span><code class="literal">asio/execution_context.hpp</code>
</p>
<p>
<span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio/execution.hpp</code>
</p>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2020 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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