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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-8944] Use C++11 standard library functions for double NaN and Infinity detection</title>
                <link>https://jira.mongodb.org/browse/SERVER-8944</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have home-grown platform-independent implementations now, which are not maximally efficient and may not be truly portable.&lt;/p&gt;</description>
                <environment></environment>
        <key id="68062">SERVER-8944</key>
            <summary>Use C++11 standard library functions for double NaN and Infinity detection</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="9">Done</resolution>
                                        <assignee username="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Mon, 11 Mar 2013 22:10:16 +0000</created>
                <updated>Wed, 25 Jan 2017 22:01:36 +0000</updated>
                            <resolved>Thu, 5 Feb 2015 19:03:41 +0000</resolved>
                                                    <fixVersion>3.1.0</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="822602" author="xgen-internal-githook" created="Thu, 5 Feb 2015 19:00:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;visualzhou&apos;, u&apos;name&apos;: u&apos;Siyuan Zhou&apos;, u&apos;email&apos;: u&apos;siyuan.zhou@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8944&quot; title=&quot;Use C++11 standard library functions for double NaN and Infinity detection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8944&quot;&gt;&lt;del&gt;SERVER-8944&lt;/del&gt;&lt;/a&gt; Use C++11 standard library functions for double NaN and Infinity detection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/93e72f29f5d58dff1229c8db9db62b4f02324117&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/93e72f29f5d58dff1229c8db9db62b4f02324117&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="482490" author="schwerin" created="Wed, 15 Jan 2014 15:35:09 +0000"  >&lt;p&gt;In a C++11 system, we could use std::isnan().  On other systems if we&apos;re doing IEEE-compliant floating point, barring compiler errors, we can compare values against themselves.  That is, given a double &lt;tt&gt;f&lt;/tt&gt;, &lt;tt&gt;f != f&lt;/tt&gt; will only be true if f is not-a-number.  However, if the compiler isn&apos;t doing IEEE-compliant floating point, it may elide the check, assuming it to be false.  Using the &lt;tt&gt;fastmath&lt;/tt&gt; argument to gcc can cause this problem.&lt;/p&gt;</comment>
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