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