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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-44049] Allow public constexpr StringData constructors</title>
                <link>https://jira.mongodb.org/browse/SERVER-44049</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;StringData currently uses a private tag pattern for its &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/base/string_data.h#L63&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;constexpr ctor&lt;/a&gt;. Since modern compilers &lt;a href=&quot;https://stackoverflow.com/questions/34280729/throw-in-constexpr-function&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;can throw from constexpr ctors&lt;/a&gt;, we should be able to make the public constructors safely constexpr now.&lt;/p&gt;</description>
                <environment></environment>
        <key id="971378">SERVER-44049</key>
            <summary>Allow public constexpr StringData constructors</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="ben.caimano@mongodb.com">Benjamin Caimano</reporter>
                        <labels>
                    </labels>
                <created>Wed, 16 Oct 2019 18:59:00 +0000</created>
                <updated>Sun, 29 Oct 2023 22:16:03 +0000</updated>
                            <resolved>Fri, 8 May 2020 10:45:43 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3075421" author="xgen-internal-githook" created="Fri, 8 May 2020 10:38:51 +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-44049&quot; title=&quot;Allow public constexpr StringData constructors&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44049&quot;&gt;&lt;del&gt;SERVER-44049&lt;/del&gt;&lt;/a&gt; constexpr StringData(ptr,len) constructor&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/38ccc532cd15d1cc5f6cc6c4ddc0be2269c4454a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/38ccc532cd15d1cc5f6cc6c4ddc0be2269c4454a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3070238" author="billy.donahue" created="Tue, 5 May 2020 19:52:48 +0000"  >&lt;p&gt;I have run into a need for this in the logv2 attribute static checking as well.  &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47933&quot; title=&quot;logv2: detect attribute collisions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47933&quot;&gt;&lt;del&gt;SERVER-47933&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3062006" author="billy.donahue" created="Thu, 30 Apr 2020 06:47:37 +0000"  >&lt;p&gt;PoC w/Tests: &lt;a href=&quot;http://mongodbcr.appspot.com/590660001&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://mongodbcr.appspot.com/590660001&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3061992" author="billy.donahue" created="Thu, 30 Apr 2020 06:42:02 +0000"  >&lt;p&gt;This feature would have helped me implement &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46503&quot; title=&quot;inline namespace mongo::literals for UDLs&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46503&quot;&gt;&lt;del&gt;SERVER-46503&lt;/del&gt;&lt;/a&gt; inline namespace mongo::literals&quot; more easily.&lt;/p&gt;

&lt;p&gt;when the StringData literal operator&quot;&quot;_sd moved to namespace mongo::literals, it was awkward to make it a friend of mongo::StringData. It would have required friendship across namespaces and a forward declaration.&lt;/p&gt;

&lt;p&gt;I chose to work around the lack of constexpr StringData ctors&lt;br/&gt;
by introducing an embarrassing public helper function for the operator&quot;&quot; to use.&lt;/p&gt;


&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&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;  margin-top: 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;span style=&quot;color: gray; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;/** Helper for the `literals::operator&quot;&quot;_sd` function below. Conceptually non-public. */&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;+    &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;static&lt;/span&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; constexpr StringData _literalHelper(&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;const&lt;/span&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;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;char&lt;/span&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;* c, std::size_t len) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;+        &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;return&lt;/span&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; StringData(c, len, TrustedInitTag{});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;+    }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;   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;
			&lt;/td&gt;
		&lt;/tr&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This is not a good solution. The right way to do it is to have a public constexpr constructor.&lt;/p&gt;</comment>
                            <comment id="2506997" author="jason.carey" created="Tue, 29 Oct 2019 17:12:13 +0000"  >&lt;p&gt;We don&apos;t immediately need this for anything.  Feel free to reopen if something comes up in the future&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1204093">SERVER-46503</issuekey>
        </issuelink>
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