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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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    <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-81147] Complain about uninitialized members in struct</title>
                <link>https://jira.mongodb.org/browse/SERVER-81147</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Recently I had a patch where I converted a &lt;tt&gt;std::pair&amp;lt;int, vector&amp;gt;&lt;/tt&gt; to a &lt;tt&gt;struct&lt;/tt&gt; to improve readability:&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;This change introduced the bug that while &lt;tt&gt;std::pair&lt;/tt&gt; initializes the values to defaults (so the &lt;tt&gt;int&lt;/tt&gt; gets initialized to &lt;tt&gt;0&lt;/tt&gt;), the &lt;tt&gt;struct&lt;/tt&gt; doesn&apos;t do this, meaning that there might be a garbage value in the &lt;tt&gt;errCode&lt;/tt&gt; field.&lt;/p&gt;

&lt;p&gt;Can we add a clang-tidy rule to cover this case? Or does Coverity already cover it? See the comments for more info; it seems a memory sanitizer may or may not catch this bug.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2444904">SERVER-81147</key>
            <summary>Complain about uninitialized members in struct</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="vishnu.kaushik@mongodb.com">Vishnu Kaushik</reporter>
                        <labels>
                    </labels>
                <created>Mon, 18 Sep 2023 15:34:19 +0000</created>
                <updated>Tue, 19 Sep 2023 20:20:43 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="5711903" author="billy.donahue" created="Mon, 18 Sep 2023 16:06:43 +0000"  >&lt;p&gt;(I&apos;ll recap what I added to the above-quoted thread)&lt;/p&gt;

&lt;p&gt;&quot; I think ideally a clang-tidy rule would complain that I&apos;m creating a struct that doesn&apos;t specify initial values for its primitive members.&quot;&lt;/p&gt;

&lt;p&gt;I don&apos;t think we would go for that. The ability to leave data members uninitialized is an optimization. You can make a trivial aggregate that way and never pay to initialize it. I would not want a static check for this to break a build of correct and efficient code.&lt;/p&gt;

&lt;p&gt;I think it&apos;s more of a user-side problem than a class-side problem. When declaring an instance of that pair-like type, if you need it to be value-initialized you would need to use curly-braces. So the declaration expresses the intent to initialize it. Other users might not need to initialize it. We can&apos;t rely on types having default values generally. It feels like one of those things we just need to get used to in C++. If we get FYI annotations in VSCode, this would be a good one.&lt;/p&gt;</comment>
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            <issuekey id="231204">SERVER-20588</issuekey>
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