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201 lines
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<title>Time traits requirements</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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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>
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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.TimeTraits"></a><a class="link" href="TimeTraits.html" title="Time traits requirements">Time traits requirements</a>
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</h3></div></div></div>
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<p>
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In the table below, <code class="computeroutput"><span class="identifier">X</span></code> denotes
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a time traits class for time type <code class="computeroutput"><span class="identifier">Time</span></code>,
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<code class="computeroutput"><span class="identifier">t</span></code>, <code class="computeroutput"><span class="identifier">t1</span></code>,
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and <code class="computeroutput"><span class="identifier">t2</span></code> denote values of type
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<code class="computeroutput"><span class="identifier">Time</span></code>, and <code class="computeroutput"><span class="identifier">d</span></code>
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denotes a value of type <code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">duration_type</span></code>.
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</p>
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<div class="table">
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<a name="asio.reference.TimeTraits.t0"></a><p class="title"><b>Table 34. TimeTraits requirements</b></p>
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<div class="table-contents"><table class="table" summary="TimeTraits requirements">
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<colgroup>
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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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return 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-condition
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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="special">::</span><span class="identifier">time_type</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">Time</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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Represents an absolute time. Must support default construction,
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and meet the requirements for <code class="computeroutput"><span class="identifier">CopyConstructible</span></code>
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and <code class="computeroutput"><span class="identifier">Assignable</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="special">::</span><span class="identifier">duration_type</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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Represents the difference between two absolute times. Must support
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default construction, and meet the requirements for <code class="computeroutput"><span class="identifier">CopyConstructible</span></code> and <code class="computeroutput"><span class="identifier">Assignable</span></code>. A duration can be
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positive, negative, or zero.
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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="special">::</span><span class="identifier">now</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">time_type</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 the current time.
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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="special">::</span><span class="identifier">add</span><span class="special">(</span><span class="identifier">t</span><span class="special">,</span>
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<span class="identifier">d</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">time_type</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 a new absolute time resulting from adding the duration
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<code class="computeroutput"><span class="identifier">d</span></code> to the absolute
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time <code class="computeroutput"><span class="identifier">t</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="special">::</span><span class="identifier">subtract</span><span class="special">(</span><span class="identifier">t1</span><span class="special">,</span>
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<span class="identifier">t2</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">duration_type</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 the duration resulting from subtracting <code class="computeroutput"><span class="identifier">t2</span></code>
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from <code class="computeroutput"><span class="identifier">t1</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="special">::</span><span class="identifier">less_than</span><span class="special">(</span><span class="identifier">t1</span><span class="special">,</span>
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<span class="identifier">t2</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="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 whether <code class="computeroutput"><span class="identifier">t1</span></code>
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is to be treated as less than <code class="computeroutput"><span class="identifier">t2</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="special">::</span><span class="identifier">to_posix_duration</span><span class="special">(</span><span class="identifier">d</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">date_time</span><span class="special">::</span><span class="identifier">time_duration_type</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 the <code class="computeroutput"><span class="identifier">date_time</span><span class="special">::</span><span class="identifier">time_duration_type</span></code>
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value that most closely represents the duration <code class="computeroutput"><span class="identifier">d</span></code>.
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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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