execution__bulk_execute.html
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<div class="titlepage"><div><div><h3 class="title">
<a name="asio.reference.execution__bulk_execute"></a><a class="link" href="execution__bulk_execute.html" title="execution::bulk_execute">execution::bulk_execute</a>
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<p>
<a class="indexterm" name="asio.indexterm.execution__bulk_execute"></a>
A customisation
point that creates a bulk sender.
</p>
<pre class="programlisting">constexpr unspecified bulk_execute = unspecified;
</pre>
<p>
The name <code class="computeroutput">execution::bulk_execute</code> denotes a customisation point
object. If <code class="computeroutput">is_convertible_v<N, size_t></code> is true, then the
expression <code class="computeroutput">execution::bulk_execute(S, F, N)</code> for some subexpressions
<code class="computeroutput">S</code>, <code class="computeroutput">F</code>, and <code class="computeroutput">N</code> is expression-equivalent
to:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<code class="computeroutput">S.bulk_execute(F, N)</code>, if that expression is valid. If the
function selected does not execute <code class="computeroutput">N</code> invocations of the
function object <code class="computeroutput">F</code> on the executor <code class="computeroutput">S</code> in bulk
with forward progress guarantee <code class="computeroutput">asio::query(S, execution::bulk_guarantee)</code>,
and the result of that function does not model <code class="computeroutput">sender<void></code>,
the program is ill-formed with no diagnostic required.
</li>
<li class="listitem">
Otherwise, <code class="computeroutput">bulk_execute(S, F, N)</code>, if that expression is
valid, with overload resolution performed in a context that includes
the declaration <code class="computeroutput">void bulk_execute();</code> and that does not include
a declaration of <code class="computeroutput">execution::bulk_execute</code>. If the function
selected by overload resolution does not execute <code class="computeroutput">N</code> invocations
of the function object <code class="computeroutput">F</code> on the executor <code class="computeroutput">S</code>
in bulk with forward progress guarantee <code class="computeroutput">asio::query(E, execution::bulk_guarantee)</code>,
and the result of that function does not model <code class="computeroutput">sender<void></code>,
the program is ill-formed with no diagnostic required.
</li>
<li class="listitem">
Otherwise, if the types <code class="computeroutput">F</code> and <code class="computeroutput">executor_index_t<remove_cvref_t<S>></code>
model <code class="computeroutput">invocable</code> and if <code class="computeroutput">asio::query(S, execution::bulk_guarantee)</code>
equals <code class="computeroutput">execution::bulk_guarantee.unsequenced</code>, then
</li>
<li class="listitem">
Evaluates <code class="computeroutput">DECAY_COPY(std::forward<decltype(F)>(F))</code>
on the calling thread to create a function object <code class="computeroutput">cf</code>. [Note:
Additional copies of <code class="computeroutput">cf</code> may subsequently be created. --end
note.]
</li>
<li class="listitem">
For each value of <code class="computeroutput">i</code> in <code class="computeroutput">N</code>, <code class="computeroutput">cf(i)</code>
(or copy of <code class="computeroutput">cf</code>)) will be invoked at most once by an execution
agent that is unique for each value of <code class="computeroutput">i</code>.
</li>
<li class="listitem">
May block pending completion of one or more invocations of <code class="computeroutput">cf</code>.
</li>
<li class="listitem">
Synchronizes with (C++Std [intro.multithread]) the invocations of <code class="computeroutput">cf</code>.
</li>
<li class="listitem">
Otherwise, <code class="computeroutput">execution::bulk_execute(S, F, N)</code> is ill-formed.
</li>
</ul></div>
<h5>
<a name="asio.reference.execution__bulk_execute.h0"></a>
<span><a name="asio.reference.execution__bulk_execute.requirements"></a></span><a class="link" href="execution__bulk_execute.html#asio.reference.execution__bulk_execute.requirements">Requirements</a>
</h5>
<p>
<span class="emphasis"><em>Header: </em></span><code class="literal">asio/execution/bulk_execute.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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