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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-52941] Break checked_cast.h assert_util.h cycles, optimize its implementation</title>
                <link>https://jira.mongodb.org/browse/SERVER-52941</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Only needs &lt;tt&gt;invariant.h&lt;/tt&gt;, should not include &lt;tt&gt;assert_util.h&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;base/checked_cast.h relies on invariant() to perform its checks and needs no other assert_util.h declarations. The errant assert_util.h dependency makes checked_cast.h inaccessible to any header that assert_util.h depends on (we need it for status.h and can&apos;t currently have it). This is an unnecessary restriction. It can be whitelisted to use the invariant.h header just like string_data.h and the small set of other assert_util.h dependencies.&lt;/p&gt;

&lt;p&gt;As for the content of checked_cast.h:&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;We should provide &lt;tt&gt;&amp;amp;&amp;amp;&lt;/tt&gt; overloads for these. A checked_cast of an rvalue should be a move, not a copy. Casting a &lt;tt&gt;shared_ptr&amp;amp;&amp;amp;&lt;/tt&gt; should not increment its refcount!&lt;br/&gt;
In C++20 the underlying std::static_pointer_cast and std::dynamic_pointer_cast are getting &lt;tt&gt;&amp;amp;&amp;amp;&lt;/tt&gt; argument overloads to avoid this cost. There&apos;s no reason we shouldn&apos;t be ready for that.&lt;/p&gt;

&lt;p&gt;The implementation of these functions is a very &lt;tt&gt;C&amp;#43;&amp;#43;98&lt;/tt&gt; dispatch to a static member function of a struct template specialization, keyed off of bool kDebugBuild. Super old school. This is silly in &lt;tt&gt;C&amp;#43;&amp;#43;17&lt;/tt&gt; where we have &lt;tt&gt;if constexpr&lt;/tt&gt; and can write that kind of dispatching very naturally in a single function body.&lt;/p&gt;

&lt;p&gt;There&apos;s some urgency to this as it blocks an improvement to status.h.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1545842">SERVER-52941</key>
            <summary>Break checked_cast.h assert_util.h cycles, optimize its implementation</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>Thu, 19 Nov 2020 05:18:25 +0000</created>
                <updated>Sun, 29 Oct 2023 22:00:16 +0000</updated>
                            <resolved>Tue, 8 Dec 2020 08:35:06 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3516351" author="xgen-internal-githook" created="Fri, 4 Dec 2020 15:42:53 +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-52941&quot; title=&quot;Break checked_cast.h assert_util.h cycles, optimize its implementation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52941&quot;&gt;&lt;del&gt;SERVER-52941&lt;/del&gt;&lt;/a&gt; checked_cast.h include invariant.h, `&amp;amp;&amp;amp;`-awareness&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1e86b5adfa3654a3c3860587dbdc087bb63779e0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1e86b5adfa3654a3c3860587dbdc087bb63779e0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3507630" author="billy.donahue" created="Sun, 29 Nov 2020 00:08:24 +0000"  >&lt;p&gt;CR &lt;a href=&quot;https://mongodbcr.appspot.com/720550001&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/720550001&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1543736">SERVER-52904</issuekey>
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