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96 lines
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<title>Sender concepts</title>
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
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<a accesskey="p" href="Scheduler.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="Service.html"><img src="../../next.png" alt="Next"></a>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.reference.Sender"></a><a class="link" href="Sender.html" title="Sender concepts">Sender concepts</a>
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</h3></div></div></div>
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<h5>
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<a name="asio.reference.Sender.h0"></a>
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<span><a name="asio.reference.Sender.sender_and_sender_to"></a></span><a class="link" href="Sender.html#asio.reference.Sender.sender_and_sender_to">sender
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and sender_to</a>
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</h5>
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<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">S</span><span class="special">></span>
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<span class="identifier">concept</span> <span class="identifier">sender</span> <span class="special">=</span>
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<span class="identifier">move_constructible</span><span class="special"><</span><span class="identifier">remove_cvref_t</span><span class="special"><</span><span class="identifier">S</span><span class="special">>></span> <span class="special">&&</span>
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<span class="special">!</span><span class="identifier">requires</span> <span class="special">{</span>
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<span class="keyword">typename</span> <span class="identifier">sender_traits</span><span class="special"><</span><span class="identifier">remove_cvref_t</span><span class="special"><</span><span class="identifier">S</span><span class="special">>>::</span><span class="identifier">__unspecialized</span><span class="special">;</span> <span class="comment">// exposition only</span>
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<span class="special">};</span>
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<span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">S</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">R</span><span class="special">></span>
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<span class="identifier">concept</span> <span class="identifier">sender_to</span> <span class="special">=</span>
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<span class="identifier">sender</span><span class="special"><</span><span class="identifier">S</span><span class="special">></span> <span class="special">&&</span>
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<span class="identifier">receiver</span><span class="special"><</span><span class="identifier">R</span><span class="special">></span> <span class="special">&&</span>
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<span class="identifier">requires</span> <span class="special">(</span><span class="identifier">S</span><span class="special">&&</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">R</span><span class="special">&&</span> <span class="identifier">r</span><span class="special">)</span> <span class="special">{</span>
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<span class="identifier">execution</span><span class="special">::</span><span class="identifier">connect</span><span class="special">((</span><span class="identifier">S</span><span class="special">&&)</span> <span class="identifier">s</span><span class="special">,</span> <span class="special">(</span><span class="identifier">R</span><span class="special">&&)</span> <span class="identifier">r</span><span class="special">);</span>
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<span class="special">};</span>
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</pre>
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<p>
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None of these operations shall introduce data races as a result of concurrent
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invocations of those functions from different threads.
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</p>
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<p>
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A sender type's destructor shall not block pending completion of the submitted
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function objects.
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</p>
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<p>
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[<span class="emphasis"><em>Note:</em></span> The ability to wait for completion of submitted
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function objects may be provided by the associated execution context. —<span class="emphasis"><em>end
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note</em></span>]
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</p>
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<h5>
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<a name="asio.reference.Sender.h1"></a>
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<span><a name="asio.reference.Sender.typed_sender"></a></span><a class="link" href="Sender.html#asio.reference.Sender.typed_sender">typed_sender</a>
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</h5>
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<p>
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A sender is <span class="bold"><strong>typed</strong></span> if it declares what types
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it sends through a receiver's channels. The <code class="computeroutput"><span class="identifier">typed_sender</span></code>
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concept is defined as:
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</p>
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<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span><span class="special">...></span> <span class="keyword">class</span> <span class="identifier">Tuple</span><span class="special">,</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span><span class="special">...></span> <span class="keyword">class</span> <span class="identifier">Variant</span><span class="special">></span> <span class="keyword">class</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">has</span><span class="special">-</span><span class="identifier">value</span><span class="special">-</span><span class="identifier">types</span><span class="special">;</span> <span class="comment">// exposition only</span>
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<span class="keyword">template</span><span class="special"><</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span><span class="special">...></span> <span class="keyword">class</span> <span class="identifier">Variant</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">has</span><span class="special">-</span><span class="identifier">error</span><span class="special">-</span><span class="identifier">types</span><span class="special">;</span> <span class="comment">// exposition only</span>
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<span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">S</span><span class="special">></span>
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<span class="identifier">concept</span> <span class="identifier">has</span><span class="special">-</span><span class="identifier">sender</span><span class="special">-</span><span class="identifier">types</span> <span class="special">=</span> <span class="comment">// exposition only</span>
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<span class="identifier">requires</span> <span class="special">{</span>
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<span class="keyword">typename</span> <span class="identifier">has</span><span class="special">-</span><span class="identifier">value</span><span class="special">-</span><span class="identifier">types</span><span class="special"><</span><span class="identifier">S</span><span class="special">::</span><span class="keyword">template</span> <span class="identifier">value_types</span><span class="special">>;</span>
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<span class="keyword">typename</span> <span class="identifier">has</span><span class="special">-</span><span class="identifier">error</span><span class="special">-</span><span class="identifier">types</span><span class="special"><</span><span class="identifier">S</span><span class="special">::</span><span class="keyword">template</span> <span class="identifier">error_types</span><span class="special">>;</span>
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<span class="keyword">typename</span> <span class="identifier">bool_constant</span><span class="special"><</span><span class="identifier">S</span><span class="special">::</span><span class="identifier">sends_done</span><span class="special">>;</span>
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<span class="special">};</span>
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<span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">S</span><span class="special">></span>
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<span class="identifier">concept</span> <span class="identifier">typed_sender</span> <span class="special">=</span>
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<span class="identifier">sender</span><span class="special"><</span><span class="identifier">S</span><span class="special">></span> <span class="special">&&</span>
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<span class="identifier">has</span><span class="special">-</span><span class="identifier">sender</span><span class="special">-</span><span class="identifier">types</span><span class="special"><</span><span class="identifier">sender_traits</span><span class="special"><</span><span class="identifier">remove_cvref_t</span><span class="special"><</span><span class="identifier">S</span><span class="special">>>>;</span>
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</pre>
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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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>
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</div>
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<hr>
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<div class="spirit-nav">
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