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    <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-39879] Fix unique_function constructor selection issues</title>
                <link>https://jira.mongodb.org/browse/SERVER-39879</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It appears that code of the following form segfaults due to recursion&lt;/p&gt;
&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;p/&gt;

&lt;p&gt;This appears to be due to the fact that the unique_function ctor resolves to have a non-const lvalue reference parameter of unique_function, which is valid because of the &lt;a href=&quot;https://github.com/mongodb/mongo/commit/0bb846536e3dda6905bd211db4e4a137705eeb51#diff-3b74617b78eb5a11fdee7f3a905fb313R90&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;templated ctor&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="706121">SERVER-39879</key>
            <summary>Fix unique_function constructor selection issues</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="13201">Fixed</resolution>
                                        <assignee username="andrew.morrow@mongodb.com">Andrew Morrow</assignee>
                                    <reporter username="ben.caimano@mongodb.com">Benjamin Caimano</reporter>
                        <labels>
                    </labels>
                <created>Wed, 27 Feb 2019 21:36:08 +0000</created>
                <updated>Sun, 29 Oct 2023 22:23:26 +0000</updated>
                            <resolved>Thu, 27 Jun 2019 18:20:51 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2301109" author="ben.caimano" created="Thu, 27 Jun 2019 18:20:51 +0000"  >&lt;p&gt;Closing this issue on request. If you run into the is_constructible related issues described in these comments, please submit a follow-on ticket.&lt;/p&gt;</comment>
                            <comment id="2261392" author="xgen-internal-githook" created="Mon, 27 May 2019 23:42:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ben Caimano&apos;, &apos;email&apos;: &apos;ben.caimano@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39879&quot; title=&quot;Fix unique_function constructor selection issues&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39879&quot;&gt;&lt;del&gt;SERVER-39879&lt;/del&gt;&lt;/a&gt; Fix unique_function constructor selection issues&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/452c7f88eb3aa4da8637b875006f82e04d496865&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/452c7f88eb3aa4da8637b875006f82e04d496865&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2254512" author="jesse" created="Tue, 21 May 2019 17:39:21 +0000"  >&lt;p&gt;Should this be assigned to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=adam.martin&quot; class=&quot;user-hover&quot; rel=&quot;adam.martin&quot;&gt;adam.martin&lt;/a&gt; again for merging?&lt;/p&gt;</comment>
                            <comment id="2179120" author="ben.caimano" created="Wed, 13 Mar 2019 00:02:06 +0000"  >&lt;p&gt;Apparently, there is an additional related issue wherein there are compilation issues when using is_constructible&amp;lt;unique_function&amp;lt;&amp;gt;&amp;gt;. This seems to come from the ordering of enable_if statements in the templated ctor. Essentially, when resolving __is_move_constructible we hit the template and attempt to use is_move_constructible. (See godbolt concept example &lt;a href=&quot;https://godbolt.org/z/DuhI8J&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.)&lt;/p&gt;

&lt;p&gt;It appears that the current order is:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;is_same_v&lt;/li&gt;
	&lt;li&gt;is_move_constructible_v&lt;/li&gt;
	&lt;li&gt;is_invocable_v&lt;/li&gt;
&lt;/ul&gt;
</comment>
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