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206 lines
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_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">X</code> denotes a time traits class for time type
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<code class="computeroutput">Time</code>, <code class="computeroutput">t</code>, <code class="computeroutput">t1</code>, and <code class="computeroutput">t2</code> denote
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values of type <code class="computeroutput">Time</code>, and <code class="computeroutput">d</code> denotes a value of type
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<code class="computeroutput">X::duration_type</code>.
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</p>
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<div class="table">
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<a name="boost_asio.reference.TimeTraits.t0"></a><p class="title"><b>Table 32. 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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<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">X::time_type</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">Time</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">CopyConstructible</code> and
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<code class="computeroutput">Assignable</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">X::duration_type</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">CopyConstructible</code>
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and <code class="computeroutput">Assignable</code>. A duration can be positive, negative,
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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">X::now();</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">time_type</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">X::add(t, d);</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">time_type</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">d</code> to the absolute time <code class="computeroutput">t</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">X::subtract(t1, t2);</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">duration_type</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">t2</code>
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from <code class="computeroutput">t1</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">X::less_than(t1, t2);</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">bool</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">t1</code> is to be treated as less than
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<code class="computeroutput">t2</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">X::to_posix_duration(d);</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">date_time::time_duration_type</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">date_time::time_duration_type</code> value that
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most closely represents the duration <code class="computeroutput">d</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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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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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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</p>
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</div></td>
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