75 lines
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75 lines
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_asio.reference.OperationState"></a><a class="link" href="OperationState.html" title="Operation state concept">Operation state
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concept</a>
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</h3></div></div></div>
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<pre class="programlisting">template<class O>
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concept operation_state =
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destructible<O> &&
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is_object_v<O> &&
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requires (O& o) {
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{ execution::start(o) } noexcept;
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};
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</pre>
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<p>
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An object whose type satisfies <code class="computeroutput">operation_state</code> represents the
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state of an asynchronous operation. It is the result of calling <code class="computeroutput">execution::connect</code>
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with a <code class="computeroutput">sender</code> and a <code class="computeroutput">receiver</code>.
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</p>
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<p>
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<code class="computeroutput">execution::start</code> may be called on an <code class="computeroutput">operation_state</code>
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object at most once. Once <code class="computeroutput">execution::start</code> has been invoked,
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the caller shall ensure that the start of a non-exceptional invocation of
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one of the receiver's completion-signalling operations strongly happens before
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[intro.multithread] the call to the <code class="computeroutput">operation_state</code> destructor.
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</p>
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<p>
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The start of the invocation of <code class="computeroutput">execution::start</code> shall strongly
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happen before [intro.multithread] the invocation of one of the three receiver
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operations.
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</p>
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<p>
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<code class="computeroutput">execution::start</code> may or may not block pending the successful
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transfer of execution to one of the three receiver operations.
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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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