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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-58111] IDL: remove ref-qualification on getters</title>
                <link>https://jira.mongodb.org/browse/SERVER-58111</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is an attempt to guard against calling getters on temporaries, a harmless thing to do that can&apos;t be prevented by this technique anyway.&lt;/p&gt;

&lt;p&gt;Getting rid of this stuff will simplify the IDL generator and give us generated classes with behavior that is less surprising.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://quuxplusone.github.io/blog/2019/03/11/value-category-is-not-lifetime/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://quuxplusone.github.io/blog/2019/03/11/value-category-is-not-lifetime/&lt;/a&gt;&lt;br/&gt;
(Thx &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=redbeard0531&quot; class=&quot;user-hover&quot; rel=&quot;redbeard0531&quot;&gt;redbeard0531&lt;/a&gt; for the link)&lt;/p&gt;</description>
                <environment></environment>
        <key id="1800127">SERVER-58111</key>
            <summary>IDL: remove ref-qualification on getters</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>
                            <label>sa-remove-fv-backlog-22</label>
                    </labels>
                <created>Mon, 28 Jun 2021 02:41:29 +0000</created>
                <updated>Sun, 29 Oct 2023 21:51:35 +0000</updated>
                            <resolved>Fri, 29 Apr 2022 04:08:47 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4504977" author="billy.donahue" created="Mon, 25 Apr 2022 20:41:14 +0000"  >&lt;p&gt;This simplification makes &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58110&quot; title=&quot;IDL: getters sometimes have const value return types&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58110&quot;&gt;&lt;del&gt;SERVER-58110&lt;/del&gt;&lt;/a&gt; easier to do&lt;/p&gt;</comment>
                            <comment id="3919412" author="JIRAUSER1256988" created="Tue, 6 Jul 2021 22:41:59 +0000"  >&lt;p&gt;Do I understand correctly that this non-ownership confusion happens with bulk file reads but not with Network consumption where we read a message at a time? &lt;/p&gt;

&lt;p&gt;I am not sure it&apos;s a good idea but we can thing about multiple BSONobjs owning a single large buffer. I am not sure that we can expect that objects bulk read from the file usually have similar lifetime, so if they collectively own a single large buffer via refcount, they will release it at once. This is really just to save one extra mem copy.&lt;/p&gt;</comment>
                            <comment id="3917907" author="daniel.gottlieb@10gen.com" created="Tue, 6 Jul 2021 14:03:43 +0000"  >&lt;p&gt;While not exactly a reference type, our default IDL code generation for BSONObj (&quot;type: object&quot;) has the analogous problem (which is arguably more pervasive and harder to diagnose). The IDL parser does not create a copy of its underlying bytes and rather relies on the underlying bytes outliving the parsed value. This has resulted in annoying to debug errors, particularly for those not indoctrinated in our BSONObj ownership contract. We have since come up with &quot;object_owned&quot; as a safer alternative for the (IMO) more general case.&lt;/p&gt;

&lt;p&gt;I&apos;d like to see a change where we rename:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;object_owned -&amp;gt; object&lt;/li&gt;
	&lt;li&gt;object -&amp;gt; object_unowned&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Admittedly, this is a more pervasive change and we&apos;d need to re-educate those in the know. If there&apos;s agreement from SA that this would be an improvement, but under a different ticket, I&apos;d be happy to file a separate one.&lt;/p&gt;

&lt;p&gt;cc &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=andrew.shuvalov&quot; class=&quot;user-hover&quot; rel=&quot;andrew.shuvalov&quot;&gt;andrew.shuvalov&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="2017461">SERVER-65278</issuekey>
        </issuelink>
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            <issuekey id="1800121">SERVER-58110</issuekey>
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