106 lines
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106 lines
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_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="boost_asio.reference.Sender.h0"></a>
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<span class="phrase"><a name="boost_asio.reference.Sender.sender_and_sender_to"></a></span><a class="link" href="Sender.html#boost_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">template<class S>
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concept sender =
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move_constructible<remove_cvref_t<S>> &&
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!requires {
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typename sender_traits<remove_cvref_t<S>>::__unspecialized; // exposition only
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};
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template<class S, class R>
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concept sender_to =
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sender<S> &&
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receiver<R> &&
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requires (S&& s, R&& r) {
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execution::connect((S&&) s, (R&&) r);
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};
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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="boost_asio.reference.Sender.h1"></a>
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<span class="phrase"><a name="boost_asio.reference.Sender.typed_sender"></a></span><a class="link" href="Sender.html#boost_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">typed_sender</code> concept
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is defined as:
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</p>
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<pre class="programlisting">template<template<template<class...> class Tuple, template<class...> class Variant> class>
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struct has-value-types; // exposition only
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template<template<class...> class Variant>
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struct has-error-types; // exposition only
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template<class S>
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concept has-sender-types = // exposition only
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requires {
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typename has-value-types<S::template value_types>;
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typename has-error-types<S::template error_types>;
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typename bool_constant<S::sends_done>;
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};
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template<class S>
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concept typed_sender =
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sender<S> &&
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has-sender-types<sender_traits<remove_cvref_t<S>>>;
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</pre>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2021 Christopher
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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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