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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[SERVER-47709] Add function to coerce numbers to Duration types</title>
                <link>https://jira.mongodb.org/browse/SERVER-47709</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Our Duration types expect signed integral types &lt;a href=&quot;https://github.com/mongodb/mongo/blob/78bc718f2f87c380fca9cdb64fd7d869bde4da2d/src/mongo/util/duration.h#L234-L246&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;upon construction&lt;/a&gt;. However, occasionally, our time data is in double or unsigned integer form. We should make functions to intentionally coerce these numbers into durations.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1326201">SERVER-47709</key>
            <summary>Add function to coerce numbers to Duration types</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="billy.donahue@mongodb.com">Billy Donahue</assignee>
                                    <reporter username="ben.caimano@mongodb.com">Benjamin Caimano</reporter>
                        <labels>
                            <label>servicearch-wfbf-day</label>
                    </labels>
                <created>Wed, 22 Apr 2020 19:33:38 +0000</created>
                <updated>Sun, 29 Oct 2023 22:09:10 +0000</updated>
                            <resolved>Fri, 22 Jan 2021 18:47:03 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3578360" author="billy.donahue" created="Fri, 22 Jan 2021 18:47:03 +0000"  >&lt;p&gt;Added &lt;tt&gt;deduceChronoDuration&lt;/tt&gt; function. To make full use of it we would need some fixes to &lt;tt&gt;mongo::duration_cast&lt;/tt&gt;. But we can rely on a 2-step &lt;tt&gt;duration_cast&lt;/tt&gt; chain in the meantime.&lt;/p&gt;</comment>
                            <comment id="3577279" author="xgen-internal-githook" created="Fri, 22 Jan 2021 09:27:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47709&quot; title=&quot;Add function to coerce numbers to Duration types&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47709&quot;&gt;&lt;del&gt;SERVER-47709&lt;/del&gt;&lt;/a&gt; add deduceChronoDuration to duration.h&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/332df3bdd7e6d5f7f9a09c9bd0861f5370bc667c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/332df3bdd7e6d5f7f9a09c9bd0861f5370bc667c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3572169" author="billy.donahue" created="Tue, 19 Jan 2021 20:32:01 +0000"  >&lt;p&gt;Code review with JUST the deduceChronoDuration function and its tests.&lt;br/&gt;
To really make full use of it we&apos;d need the mongo::duration_cast fixes discussed above.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://mongodbcr.appspot.com/750430046/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/750430046/&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3522262" author="billy.donahue" created="Wed, 9 Dec 2020 03:30:25 +0000"  >&lt;p&gt;I&apos;ve resurrected and rebased my old branch in which I got this in pretty good shape a while ago.&lt;/p&gt;

&lt;p&gt;It would be a big improvement for mongo::Duration.&lt;/p&gt;

&lt;p&gt;It&apos;s almost ready to review but we will have to think of more really evil torture tests for it.&lt;/p&gt;

&lt;p&gt;I&apos;ve self-bikeshedded to &lt;tt&gt;deduceChronoDuration&lt;/tt&gt;.&lt;br/&gt;
To interpret as seconds, you can leave out the Period ratio parameter.&lt;/p&gt;

&lt;p&gt;These produce &lt;tt&gt;std::chrono&amp;lt;Rep, Per&amp;gt;&lt;/tt&gt; with the specified period but a deduced Rep that matches the numeric argument type.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    deduceChronoDuration(valSecs);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    deduceChronoDuration&amp;lt;std::milli&amp;gt;(valMillis);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    deduceChronoDuration&amp;lt;std::micro&amp;gt;(valMicros);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Once you have these, duration_cast can, with maximal precision, do a correct conversion.&lt;br/&gt;
The important thing is to not change Rep too early in the conversion chain.&lt;/p&gt;

&lt;p&gt;PoC:&lt;br/&gt;
&lt;a href=&quot;https://github.com/BillyDonahue/mongo/commits/SERVER-47709&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/BillyDonahue/mongo/commits/SERVER-47709&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3076519" author="billy.donahue" created="Fri, 8 May 2020 20:11:05 +0000"  >&lt;p&gt;Our &lt;tt&gt;mongo::Duration&amp;lt;Period&amp;gt;&lt;/tt&gt; types can&apos;t use arbitrary &lt;tt&gt;Rep&lt;/tt&gt; like &lt;tt&gt;std::chrono::duration&amp;lt;Rep,Period&amp;gt;&lt;/tt&gt; can. But we do have a &lt;tt&gt;mongo::duration_cast&lt;/tt&gt; that accepts any &lt;tt&gt;std::chrono::duration&lt;/tt&gt;. This is good, but it isn&apos;t general enough. It converts to our &lt;tt&gt;Duration&lt;/tt&gt; rep type and then does scaling. I don&apos;t think it works well with &lt;tt&gt;chrono::duration&amp;lt;Float,Period&amp;gt;&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;I recommend two things to fix this problem.&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;First:&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Fix our &lt;tt&gt;mongo::duration_cast&lt;/tt&gt; to be more useful and correct for any &lt;tt&gt;std::chrono:duration&lt;/tt&gt;. We could just use the &lt;tt&gt;std::chrono::duration_cast&lt;/tt&gt; logic, but we want our overflow and narrowing protection, so we&apos;ll have to rewrite it a little. But it&apos;s open source, and we can just go grab it and change it.&lt;br/&gt;
&lt;a href=&quot;https://github.com/llvm/llvm-project/blob/5e74cf29991c498de8905f039f1b0bbfc715acdc/libcxx/include/chrono#L880-L946&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/llvm/llvm-project/blob/5e74cf29991c498de8905f039f1b0bbfc715acdc/libcxx/include/chrono#L880-L946&lt;/a&gt;&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Second:&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Make it easy to make a &lt;tt&gt;std::chrono::duration&amp;lt;Rep,Period&amp;gt;&lt;/tt&gt; with deduced &lt;tt&gt;Rep&lt;/tt&gt;.&lt;br/&gt;
It would be nice if &lt;tt&gt;std::chrono::duration&lt;/tt&gt; had a deduction guide for this but whadda gonna do, right? Recommend new deducing factory function, something like:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;template&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; &amp;lt;&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;typename&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; Rep, &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;typename&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; Per=std::ratio&amp;lt;1&amp;gt;&amp;gt;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;auto makeChronoDuration(Rep rep, Per={}){&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;return&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; std::chrono::duration&amp;lt;Rep, Per&amp;gt;(rep);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Combining these two orthogonal primitives gives us what we want.&lt;/li&gt;
&lt;/ul&gt;


&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// Doesn&apos;t matter which arithmetic type T is. Could be double.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;T valSecs;    // type-unsafe seconds&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;T valMillis;  // type-unsafe milliseconds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;T valMicros;  // type-unsafe microseconds&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;LOGV2(0,&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      &quot;Waited a while&quot;,&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      &quot;d1&quot;_attr = duration_cast&amp;lt;Milliseconds&amp;gt;(makeChronoDuration(valSecs)),&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      &quot;d2&quot;_attr = duration_cast&amp;lt;Milliseconds&amp;gt;(makeChronoDuration(valMillis, std::milli{})),&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      &quot;d3&quot;_attr = duration_cast&amp;lt;Milliseconds&amp;gt;(makeChronoDuration(valMicros, std::micro{})));&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;&lt;a href=&quot;https://gcc.godbolt.org/z/SVyy8Y&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://gcc.godbolt.org/z/SVyy8Y&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I don&apos;t recommend adding members to &lt;tt&gt;mongo::Duration&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;I don&apos;t think we should combine the two steps into a convenience function.&lt;br/&gt;
It&apos;s good to have the &lt;tt&gt;duration_cast&lt;/tt&gt; and &lt;tt&gt;makeChronoDuration&lt;/tt&gt; calls directly represented, and the explicit composing syntax will suggest flexibility to maintainers.&lt;/p&gt;</comment>
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