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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-68822] Coverity analysis defect 122804: AUTO_CAUSES_COPY</title>
                <link>https://jira.mongodb.org/browse/SERVER-68822</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;AUTO_CAUSES_COPY&lt;/p&gt;

&lt;p&gt; Unnecessary object copies can affect performance. Using the auto keyword without an &amp;amp; causes a copy.&lt;br/&gt;
/src/mongo/rpc/metadata.cpp:191: AUTO_CAUSES_COPY 122804 Using the &quot;auto&quot; keyword without an &quot;&amp;amp;&quot; causes the copy of an object of type BSONElement.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2113772">SERVER-68822</key>
            <summary>Coverity analysis defect 122804: AUTO_CAUSES_COPY</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="jennifer.wang@mongodb.com">Jennifer Wang</assignee>
                                    <reporter username="xgen-internal-coverity">Coverity Collector User</reporter>
                        <labels>
                            <label>coverity</label>
                            <label>neweng</label>
                    </labels>
                <created>Mon, 15 Aug 2022 12:11:14 +0000</created>
                <updated>Fri, 14 Jul 2023 20:19:09 +0000</updated>
                            <resolved>Fri, 14 Jul 2023 20:19:09 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5567868" author="milkie" created="Fri, 14 Jul 2023 19:52:10 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kyle.suarez%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;kyle.suarez@mongodb.com&quot;&gt;kyle.suarez@mongodb.com&lt;/a&gt; is the new caretaker for Coverity.&lt;br/&gt;
In the 11 months since this ticket was created, we&apos;ve already decided not to flag any AUTO_CAUSES_COPY defects that involve BSONElement, so there is nothing left to do here besides close this ticket as Wont-Do.&lt;/p&gt;</comment>
                            <comment id="5567209" author="JIRAUSER1273943" created="Fri, 14 Jul 2023 16:18:06 +0000"  >&lt;p&gt;This is not a real issue. We&apos;d prefer to silence Coverity rather than make unnecessary changes to avoid the false positive. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;milkie@mongodb.com&quot;&gt;milkie@mongodb.com&lt;/a&gt; Is there a way to silence Coverity?&lt;/p&gt;</comment>
                            <comment id="5564641" author="billy.donahue" created="Thu, 13 Jul 2023 18:02:26 +0000"  >&lt;p&gt;False positive. Adding reference quals to this `auto` has no effect, as the initializer expression is a prvalue.&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    auto docSequenceElem = docSequenceIt == docSequenceFieldsForCommands.end()&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;        ? BSONElement()&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;        : cmdObj[docSequenceIt-&amp;gt;second];&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;The compiler will do the right thing to produce a prvalue inside each branch of the conditional. There is no additional overhead in initializing the local variable by move construction from that prvalue.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://gcc.godbolt.org/z/xbsqTc6qf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://gcc.godbolt.org/z/xbsqTc6qf&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Coverity is flat-out incorrect that &lt;tt&gt;auto&lt;/tt&gt; variables &quot;cause&quot; object copies.&lt;br/&gt;
I recommend rejecting issues generated by this Coverity rule.&lt;/p&gt;</comment>
                            <comment id="4767939" author="blake.oler" created="Mon, 22 Aug 2022 17:44:32 +0000"  >&lt;p&gt;If this was in a non-legacy part of the command path, I would treat this with higher priority.&lt;/p&gt;</comment>
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