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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-45591] Improve is_copy_constructible calls in future impl</title>
                <link>https://jira.mongodb.org/browse/SERVER-45591</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Our future&apos;s code makes use of a std::is_copy_constructible_v call inside fillChildren to avoid attempting to instantiate implementations for move only T&apos;s.  There are also a few other static_asserts that check the same parameter.&lt;/p&gt;

&lt;p&gt;The problem is that for every T, std::is_copy_constructible_v&amp;lt;std::vector&amp;lt;T&amp;gt;&amp;gt; == true, because std::vector is a crappy old type and always has a copy constructor (it just can&apos;t be instantiated for move only types).  This causes our static_asserts to be worthless, and for Future&amp;lt;vector&amp;lt;MoveOnly&amp;gt;&amp;gt; to be uninstantiatable.&lt;/p&gt;

&lt;p&gt;We should add some kind of util::is_actually_copy_constructible_v that has a special case for vector, and for anything else we end up finding, and use that instead.  If we don&apos;t do that, the workaround is to wrap your vector&apos;s in types that you explicitly make move only, which isn&apos;t the best ergonomics&lt;/p&gt;</description>
                <environment></environment>
        <key id="1097834">SERVER-45591</key>
            <summary>Improve is_copy_constructible calls in future impl</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="spencer@mongodb.com">Spencer Brody</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                    </labels>
                <created>Wed, 15 Jan 2020 20:29:20 +0000</created>
                <updated>Sun, 29 Oct 2023 22:13:14 +0000</updated>
                            <resolved>Mon, 4 May 2020 21:40:49 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3067717" author="xgen-internal-githook" created="Mon, 4 May 2020 18:17:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Spencer T Brody&apos;, &apos;email&apos;: &apos;spencer@mongodb.com&apos;, &apos;username&apos;: &apos;stbrody&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45591&quot; title=&quot;Improve is_copy_constructible calls in future impl&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45591&quot;&gt;&lt;del&gt;SERVER-45591&lt;/del&gt;&lt;/a&gt; Fix unit test compile on Windows: MSVC does not allow vector&amp;lt;map&amp;lt;move-only type&amp;gt;&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aacb7410c83ed079fc62af94fa546dedc66b89fa&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aacb7410c83ed079fc62af94fa546dedc66b89fa&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3063712" author="xgen-internal-githook" created="Thu, 30 Apr 2020 22:58:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Spencer T Brody&apos;, &apos;email&apos;: &apos;spencer@mongodb.com&apos;, &apos;username&apos;: &apos;stbrody&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45591&quot; title=&quot;Improve is_copy_constructible calls in future impl&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45591&quot;&gt;&lt;del&gt;SERVER-45591&lt;/del&gt;&lt;/a&gt; Fix is_really_copy_constructible and add more tests.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a6dbdff35b3367f110fca078980cc46c3752446e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a6dbdff35b3367f110fca078980cc46c3752446e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3053002" author="billy.donahue" created="Thu, 23 Apr 2020 17:07:35 +0000"  >&lt;p&gt;Reopening just to get my &lt;a href=&quot;https://mongodbcr.appspot.com/588780001&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;CR comments&lt;/a&gt; looked at. Sorry I was too late with them. We&apos;ll probably need another CR to roll it back or at least fix some problems with it (like opening the anonymous namespace in the header).&lt;/p&gt;</comment>
                            <comment id="3052100" author="xgen-internal-githook" created="Thu, 23 Apr 2020 00:03:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Spencer T Brody&apos;, &apos;email&apos;: &apos;spencer@mongodb.com&apos;, &apos;username&apos;: &apos;stbrody&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45591&quot; title=&quot;Improve is_copy_constructible calls in future impl&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45591&quot;&gt;&lt;del&gt;SERVER-45591&lt;/del&gt;&lt;/a&gt; Allow Future&amp;lt;vector&amp;lt;move-only-type&amp;gt;&amp;gt; by adding is_really_copy_constructible type trait.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/122dbabbb510f7e6bd822cc591c8224ae83e838d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/122dbabbb510f7e6bd822cc591c8224ae83e838d&lt;/a&gt;&lt;/p&gt;</comment>
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