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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-54836] tassert() should use operator bool()</title>
                <link>https://jira.mongodb.org/browse/SERVER-54836</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Let&apos;s say I have a &lt;tt&gt;boost::optional&amp;lt;T&amp;gt;&lt;/tt&gt;. I would like to be able to write the following:&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;
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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;boost::optional&amp;lt;T&amp;gt; myT = getT();&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;   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;tassert(1234500, &quot;expected a non-none T&quot;, myT);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
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&lt;p/&gt;

&lt;p&gt;However, today I have to write either&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;
		&lt;tbody &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;  margin-top: 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;tassert(1234500, &quot;expected a non-none T&quot;, static_cast&amp;lt;bool&amp;gt;(myT));&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
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&lt;p/&gt;

&lt;p&gt;or&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;
		&lt;tbody &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;  margin-top: 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;tassert(1234500, &quot;expected a non-none T&quot;, myT.has_value());&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
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&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="1635052">SERVER-54836</key>
            <summary>tassert() should use operator bool()</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="13201">Fixed</resolution>
                                        <assignee username="yoonsoo.kim@mongodb.com">Yoon Soo Kim</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Fri, 26 Feb 2021 22:16:30 +0000</created>
                <updated>Sun, 29 Oct 2023 21:56:56 +0000</updated>
                            <resolved>Wed, 10 Mar 2021 18:11:16 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3657399" author="xgen-internal-githook" created="Wed, 10 Mar 2021 18:04:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yoonsoo Kim&apos;, &apos;email&apos;: &apos;yoonsoo.kim@mongodb.com&apos;, &apos;username&apos;: &apos;yun-soo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54836&quot; title=&quot;tassert() should use operator bool()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54836&quot;&gt;&lt;del&gt;SERVER-54836&lt;/del&gt;&lt;/a&gt; Cleaned up a few of static_cast&amp;lt;bool&amp;gt; and has_value() calls&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4c74e17d5c2166e1347244652bd3ba7d50d034ef&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4c74e17d5c2166e1347244652bd3ba7d50d034ef&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3650883" author="billy.donahue" created="Sat, 6 Mar 2021 19:59:38 +0000"  >&lt;p&gt;I would have some feedback on the details if we went to code review, but yes the preprocessor arity-dispatch is the right direction.&lt;/p&gt;

&lt;p&gt;Yes we do have to support MSVC. There are workarounds for MSVC. See boost/preprocessor and util/invariant.h.&lt;/p&gt;

&lt;p&gt;I am working on this problem right now, under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55017&quot; title=&quot;iassert/tassert evaluate arguments when untriggered&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55017&quot;&gt;&lt;del&gt;SERVER-55017&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;There are a few other related points I want to hit while I&apos;m in this file though, so I want to avoid a situation where we have competing changes.&lt;/p&gt;</comment>
                            <comment id="3650738" author="billy.donahue" created="Sat, 6 Mar 2021 11:01:29 +0000"  >&lt;p&gt;Changes to util/assert_util.h should involve Service Architecture. If it breaks, that&apos;s who would be on the hook to fix it. &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;

&lt;p&gt;To address the original description&apos;s problem, I&apos;d suggest a third option. The shortest way to get an explicit bool context is with &lt;tt&gt;!!&lt;/tt&gt;, so:&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;
		&lt;tbody &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;  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;tassert(1234500, &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;expected a non-none T&quot;&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;, myT);  &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// error&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;   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;tassert(1234500, &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;expected a non-none T&quot;&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;, !!myT);  &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// fine&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;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;But I agree that this behavior of tassert doesn&apos;t meet user expectations. This is one of several &lt;tt&gt;tassert&lt;/tt&gt; implementation flaws and we should handle them holistically and with careful design. The origin of this problem is that the &lt;tt&gt;tassert&lt;/tt&gt; macro doesn&apos;t expand the condition within an internal &lt;tt&gt;if&lt;/tt&gt; statement as a caller would expect, and the way every other assert macro does. This is perhaps because it was written as an outsider contribution, I don&apos;t know. I know it doesn&apos;t match the implementation style of the other asserts and there&apos;s no technical need for that, as far as I can tell. This has other knock-on effects, like forcing the construction of a &lt;tt&gt;SourceLocation&lt;/tt&gt; and &lt;tt&gt;std::string msg&lt;/tt&gt; (EXPENSIVE!) even in the success case where those objects won&apos;t be used.&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;iassert&lt;/tt&gt; has exactly the same implementation flaws and must be fixed in the same way, preferably at the same time.&lt;/p&gt;

&lt;p&gt;I think it&apos;s simpler to fix all of this at once, as patching in a small way to do JUST an explicit &lt;tt&gt;bool&lt;/tt&gt; cast will not fix those other problems and can make them a little more annoying to track and backport the effort.&lt;/p&gt;

&lt;p&gt;I&apos;m marking this ticket as &quot;caused by&quot; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55017&quot; title=&quot;iassert/tassert evaluate arguments when untriggered&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55017&quot;&gt;&lt;del&gt;SERVER-55017&lt;/del&gt;&lt;/a&gt;, which is a ticket I hope to expedite and which should address the larger issue common to &lt;tt&gt;iassert&lt;/tt&gt; and &lt;tt&gt;tassert&lt;/tt&gt;.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="1642557">SERVER-55017</issuekey>
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