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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-41552] LogStreamBuilder unconstrained operator&lt;&lt; doesn&apos;t cover expected set of types.</title>
                <link>https://jira.mongodb.org/browse/SERVER-41552</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/22a595fbef4d023002b3c74d529368fcc4dbb196/src/mongo/logger/logstream_builder.h#L203&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/22a595fbef4d023002b3c74d529368fcc4dbb196/src/mongo/logger/logstream_builder.h#L203&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Among the many overloads of &lt;tt&gt;LogStreamBuilder::operator&amp;lt;&amp;lt;&lt;/tt&gt;,&lt;br/&gt;
we have this catch-all.&lt;/p&gt;
&lt;p/&gt;
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&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;
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					&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;    LogstreamBuilder&amp;amp; operator&amp;lt;&amp;lt;(const T&amp;amp; x) {&lt;/span&gt;&lt;/pre&gt;
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						&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;        stream() &amp;lt;&amp;lt; x.toString();&lt;/span&gt;&lt;/pre&gt;
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					&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;        return *this;&lt;/span&gt;&lt;/pre&gt;
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					&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;    }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;The problem is that it&apos;s not constrained to T for which &lt;tt&gt;x.toString()&lt;/tt&gt; exists.&lt;br/&gt;
So it matches types it shouldn&apos;t, and they then fail to compile. It can also hide other operators that should be good matches due to implicit conversions or base classes.&lt;/p&gt;

&lt;p&gt;We could probably do much better here.&lt;/p&gt;

&lt;p&gt;Maybe if &lt;tt&gt;x.toString()&lt;/tt&gt; is valid, we allow this into the overload set.&lt;/p&gt;

&lt;p&gt;Otherwise, if &lt;tt&gt;std::ostream&amp;lt;&amp;lt;x&lt;/tt&gt; is valid, we do &lt;tt&gt;stream()&amp;lt;&amp;lt;x&lt;/tt&gt;, which a lot of the other overloads do.&lt;/p&gt;

&lt;p&gt;Otherwise, &lt;tt&gt;LogStreamBuilder&lt;/tt&gt; butts out and doesn&apos;t provide an overload for the operator. There&apos;s still a chance for x to define its own &lt;tt&gt;operator&amp;lt;&amp;lt;&lt;/tt&gt; for &lt;tt&gt;LogStreamBuilder&lt;/tt&gt; to be found by ADL, but that&apos;s not &lt;tt&gt;LogStreamBuilder&lt;/tt&gt;&apos;s concern.&lt;/p&gt;

&lt;p&gt;This strategy would reduce user surprise, and reduce the number of overloads in &lt;tt&gt;LogStreamBuilder&lt;/tt&gt; from its current (insufficient) 24 down to something like 3.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="790242">SERVER-41552</key>
            <summary>LogStreamBuilder unconstrained operator&lt;&lt; doesn&apos;t cover expected set of types.</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="mira.carey@mongodb.com">Mira Carey</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Wed, 5 Jun 2019 20:22:40 +0000</created>
                <updated>Thu, 27 Jun 2019 18:02:43 +0000</updated>
                            <resolved>Thu, 27 Jun 2019 18:02:43 +0000</resolved>
                                    <version>Backlog</version>
                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2301082" author="jason.carey" created="Thu, 27 Jun 2019 18:02:43 +0000"  >&lt;p&gt;Closing this as wontfix, as the cr was more contentious than expected and the value is limited (given our move to a new logging format in future)&lt;/p&gt;</comment>
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