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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>
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<item>
            <title>[SERVER-81397] IDL: replace kNum${enumType} with generic-friendly trait</title>
                <link>https://jira.mongodb.org/browse/SERVER-81397</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In researching &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81394&quot; title=&quot;replace `invariant` etc uses of boost/preprocessor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81394&quot;&gt;&lt;del&gt;SERVER-81394&lt;/del&gt;&lt;/a&gt; (targeting Boost.Preprocessor usage specifically), I found a very heavy Boost.Preprocessor macro system to implement sophisticated macro system for resharding metrics. I mean it&apos;s really an achievement in its own right. However, it immediately occurred to me that this was a workaround.&lt;/p&gt;

&lt;p&gt;It was only really necessary because of an IDL generator problem. We must use preprocessor token-stitching to produce the name of a trait of an IDL-generated enum trait &lt;tt&gt;kNum##name&lt;/tt&gt; for the enum &lt;tt&gt;name&lt;/tt&gt;.  If we make a very small change to IDL, we can just specialize a trait e.g. &lt;tt&gt;idlEnumCount&amp;lt;name&amp;gt;&lt;/tt&gt; instead, and vastly simplify the resharding metrics registration code I encountered. And we&apos;d unlock other beneficial uses in code for teams that aren&apos;t currently in a position to put that much engineering time into a workaround.&lt;/p&gt;

&lt;p&gt;And it&apos;s a very small and simple change! We don&apos;t really use this trait much.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2449929">SERVER-81397</key>
            <summary>IDL: replace kNum${enumType} with generic-friendly trait</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Sun, 24 Sep 2023 22:21:17 +0000</created>
                <updated>Sun, 29 Oct 2023 21:15:59 +0000</updated>
                            <resolved>Wed, 27 Sep 2023 05:26:54 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5733473" author="xgen-internal-githook" created="Wed, 27 Sep 2023 04:42:23 +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-81397&quot; title=&quot;IDL: replace kNum${enumType} with generic-friendly trait&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81397&quot;&gt;&lt;del&gt;SERVER-81397&lt;/del&gt;&lt;/a&gt; add generic-friendly alternative idlEnumCount&amp;lt;Foo&amp;gt;, remove kNumFoo&lt;/p&gt;

&lt;p&gt;enumSizeForCumulativeMetrics&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/191ec34eca0a9ee072c1ba619d3bbdea4e6dab1f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/191ec34eca0a9ee072c1ba619d3bbdea4e6dab1f&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2449861">SERVER-81394</issuekey>
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