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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-30764] Add support for hashing in idl generated classes</title>
                <link>https://jira.mongodb.org/browse/SERVER-30764</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A common extension of idl types is the generation of a hash function (for use in unordered containers).&lt;/p&gt;

&lt;p&gt;We currently have free functions in the codebase which use both all fields, as well as limited subsets, so a code reducing impl should include support for both.&lt;/p&gt;

&lt;p&gt;An example syntax might look like:&lt;/p&gt;

&lt;p&gt;For all fields:&lt;/p&gt;

&lt;p&gt;hash: all&lt;/p&gt;

&lt;p&gt;For a subset:&lt;/p&gt;

&lt;p&gt;hash: &lt;span class=&quot;error&quot;&gt;&amp;#91;a,c, b&amp;#93;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;I&apos;m on the fence whether we should expose these as:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;std::hash specializations&lt;/li&gt;
	&lt;li&gt;dependent types as T::Hash&lt;/li&gt;
	&lt;li&gt;adl lookup.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;We probably also want to support a facility for attaching a c++ function to a type as the hash function (to bootstrap user defined types)&lt;/p&gt;</description>
                <environment></environment>
        <key id="418501">SERVER-30764</key>
            <summary>Add support for hashing in idl generated classes</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="13200">Declined</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                    </labels>
                <created>Mon, 21 Aug 2017 17:47:34 +0000</created>
                <updated>Thu, 24 Aug 2023 23:38:01 +0000</updated>
                            <resolved>Thu, 24 Aug 2023 23:38:01 +0000</resolved>
                                                                    <component>IDL</component>
                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4262728" author="JIRAUSER1262719" created="Tue, 21 Dec 2021 21:33:29 +0000"  >&lt;p&gt;We haven&#8217;t heard back from you in at least 1 year, so I&apos;m going to close this ticket. If this is still an issue for you, please provide additional information and we will reopen the ticket.&lt;/p&gt;</comment>
                    </comments>
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