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183 lines
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<title>Cancellation slot requirements</title>
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<a accesskey="p" href="CancellationHandler.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="CompletionCondition.html"><img src="../../next.png" alt="Next"></a>
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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.reference.CancellationSlot"></a><a class="link" href="CancellationSlot.html" title="Cancellation slot requirements">Cancellation slot requirements</a>
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</h3></div></div></div>
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<p>
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A type <code class="computeroutput"><span class="identifier">X</span></code> meets the <code class="computeroutput"><span class="identifier">CancellationSlot</span></code> requirements if it satisfies
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the requirements of <code class="computeroutput"><span class="identifier">CopyConstructible</span></code>
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(C++Std [copyconstructible]) and <code class="computeroutput"><span class="identifier">Destructible</span></code>
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(C++Std [destructible]), as well as the additional requirements listed below.
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</p>
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<p>
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In the table below, <code class="computeroutput"><span class="identifier">x1</span></code> and
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<code class="computeroutput"><span class="identifier">x2</span></code> denote (possibly const)
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values of type <code class="computeroutput"><span class="identifier">X</span></code>, <code class="computeroutput"><span class="identifier">mx1</span></code> denotes an xvalue of type <code class="computeroutput"><span class="identifier">X</span></code>, <code class="computeroutput"><span class="identifier">H</span></code>
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denotes a type that satisfies <code class="computeroutput"><span class="identifier">CancellationHandler</span></code>,
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<code class="computeroutput"><span class="identifier">h</span></code> denotes an xvalue of type
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<code class="computeroutput"><span class="identifier">H</span></code>, and <code class="computeroutput"><span class="identifier">u0</span></code>
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to <code class="computeroutput"><span class="identifier">uN</span></code> denote identifiers.
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</p>
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<div class="table">
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<a name="asio.reference.CancellationSlot.t0"></a><p class="title"><b>Table 8. CancellationSlot requirements</b></p>
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<div class="table-contents"><table class="table" summary="CancellationSlot requirements">
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<colgroup>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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expression
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</p>
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</th>
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<th>
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<p>
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type
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</p>
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</th>
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<th>
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<p>
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assertion/note<br> pre/post-conditions
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">X</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">x1</span><span class="special">);</span></code>
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</p>
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</td>
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<td>
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</td>
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<td>
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<p>
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Shall not exit via an exception.<br> <br> post: <code class="computeroutput"><span class="identifier">u</span> <span class="special">==</span>
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<span class="identifier">x1</span></code>.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">X</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">mx1</span><span class="special">);</span></code>
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</p>
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</td>
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<td>
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</td>
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<td>
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<p>
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Shall not exit via an exception.<br> <br> post: <code class="computeroutput"><span class="identifier">u</span></code> equals the prior value of
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<code class="computeroutput"><span class="identifier">mx1</span></code>.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">x1</span> <span class="special">==</span>
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<span class="identifier">x2</span></code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="keyword">bool</span></code>
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</p>
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</td>
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<td>
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<p>
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Returns <code class="computeroutput"><span class="keyword">true</span></code> only
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if <code class="computeroutput"><span class="identifier">x1</span></code> and <code class="computeroutput"><span class="identifier">x2</span></code> can be interchanged with identical
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effects. <br> <code class="computeroutput"><span class="keyword">operator</span><span class="special">==</span></code> shall be reflexive, symmetric,
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and transitive, and shall not exit via an exception.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">x1</span> <span class="special">!=</span>
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<span class="identifier">x2</span></code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="keyword">bool</span></code>
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</p>
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</td>
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<td>
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<p>
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Same as <code class="computeroutput"><span class="special">!(</span><span class="identifier">x1</span>
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<span class="special">==</span> <span class="identifier">x2</span><span class="special">)</span></code>.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">x1</span><span class="special">.</span><span class="identifier">assign</span><span class="special">(</span><span class="identifier">h</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">H</span><span class="special">&</span></code>
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</p>
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</td>
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<td>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">x1</span><span class="special">.</span><span class="identifier">emplace</span><span class="special"><</span><span class="identifier">H</span><span class="special">>(</span><span class="identifier">u0</span><span class="special">,</span>
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<span class="special">...,</span> <span class="identifier">uN</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">H</span><span class="special">&</span></code>
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</p>
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</td>
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<td>
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<p>
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Requires that <code class="computeroutput"><span class="identifier">is_constructible</span><span class="special"><</span><span class="identifier">H</span><span class="special">,</span> <span class="keyword">decltype</span><span class="special">(</span><span class="identifier">u0</span><span class="special">),</span> <span class="special">...,</span>
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<span class="keyword">decltype</span><span class="special">(</span><span class="identifier">u0</span><span class="special">)>::</span><span class="identifier">value</span></code> be true.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<br class="table-break">
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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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