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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>
    </build-info>


<item>
            <title>[CXX-1089] document::element::operator[] overloads should not throw when given an invalid element</title>
                <link>https://jira.mongodb.org/browse/CXX-1089</link>
                <project id="11980" key="CXX">C++ Driver</project>
                    <description>&lt;p&gt;&lt;tt&gt;bsoncxx::document::element::operator[]&lt;/tt&gt; is documented as non-throwing, however the expression &lt;tt&gt;bsoncxx::document::element{}[&quot;foo&quot;]&lt;/tt&gt; throws.&lt;/p&gt;

&lt;p&gt;A fix for this issue was attempted in &lt;a href=&quot;https://jira.mongodb.org/browse/CXX-862&quot; title=&quot;The element and array type operator[] function should not throw&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CXX-862&quot;&gt;&lt;del&gt;CXX-862&lt;/del&gt;&lt;/a&gt;, but the fix was incomplete.&lt;/p&gt;

&lt;p&gt;Original description:&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;bsoncxx::document view blubb;&lt;/p&gt;

&lt;p&gt;if( blubb[&quot;jolo&quot;] )&lt;br/&gt;
=&amp;gt; false&lt;/p&gt;

&lt;p&gt;if( blubb[&quot;jolo&quot;][1] )&lt;br/&gt;
terminate called after throwing an instance of &apos;bsoncxx::v_noabi::exception&apos;&lt;br/&gt;
  what():  unset document::element&lt;br/&gt;
For this, can the exception say, that I&apos;m out of bound of a array, or that no array is existing?&lt;br/&gt;
Most awesome would be if the exception would tell the non existing position.&lt;/p&gt;

&lt;p&gt;This behavior is a bit misleading. I would assume for both the upper behavior in just returning a true or false.&lt;/p&gt;&lt;/blockquote&gt;</description>
                <environment></environment>
        <key id="323481">CXX-1089</key>
            <summary>document::element::operator[] overloads should not throw when given an invalid element</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="david.golden@mongodb.com">David Golden</assignee>
                                    <reporter username="Weltenbummler">Armin Ball [X]</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 Oct 2016 17:58:09 +0000</created>
                <updated>Tue, 15 Nov 2016 22:11:54 +0000</updated>
                            <resolved>Fri, 28 Oct 2016 16:25:09 +0000</resolved>
                                                    <fixVersion>3.0.3</fixVersion>
                                    <component>BSON</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1429310" author="xgen-internal-githook" created="Tue, 8 Nov 2016 16:25:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;xdg&apos;, u&apos;name&apos;: u&apos;David Golden&apos;, u&apos;email&apos;: u&apos;xdg@xdg.me&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CXX-1089&quot; title=&quot;document::element::operator[] overloads should not throw when given an invalid element&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CXX-1089&quot;&gt;&lt;del&gt;CXX-1089&lt;/del&gt;&lt;/a&gt; Make operator[] not throw when invalid&lt;/p&gt;

&lt;p&gt;For any valid element of the wrong type, calling operator[] would&lt;br/&gt;
return an invalid element.  Due to a quirk, calling operator[] on&lt;br/&gt;
the invalid element would throw.&lt;/p&gt;

&lt;p&gt;This commit makes operator[] not throw for the invalid element either&lt;br/&gt;
and updates the documentation to clarify its behavior.&lt;br/&gt;
Branch: 3.1-dev&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-cxx-driver/commit/bb5e88eeee853a35bd975016121136913783d32f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-cxx-driver/commit/bb5e88eeee853a35bd975016121136913783d32f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1420650" author="xgen-internal-githook" created="Fri, 28 Oct 2016 16:22:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;xdg&apos;, u&apos;name&apos;: u&apos;David Golden&apos;, u&apos;email&apos;: u&apos;xdg@xdg.me&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CXX-1089&quot; title=&quot;document::element::operator[] overloads should not throw when given an invalid element&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CXX-1089&quot;&gt;&lt;del&gt;CXX-1089&lt;/del&gt;&lt;/a&gt; Make operator[] not throw when invalid&lt;/p&gt;

&lt;p&gt;For any valid element of the wrong type, calling operator[] would&lt;br/&gt;
return an invalid element.  Due to a quirk, calling operator[] on&lt;br/&gt;
the invalid element would throw.&lt;/p&gt;

&lt;p&gt;This commit makes operator[] not throw for the invalid element either&lt;br/&gt;
and updates the documentation to clarify its behavior.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-cxx-driver/commit/bb5e88eeee853a35bd975016121136913783d32f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-cxx-driver/commit/bb5e88eeee853a35bd975016121136913783d32f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1418451" author="david.golden" created="Wed, 26 Oct 2016 17:00:32 +0000"  >&lt;p&gt;&lt;a href=&quot;https://mongodbcr.appspot.com/104180002/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/104180002/&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1410915" author="rassi@10gen.com" created="Mon, 17 Oct 2016 21:13:07 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.golden&quot; class=&quot;user-hover&quot; rel=&quot;david.golden&quot;&gt;david.golden&lt;/a&gt;: I agree with your proposal to make document::element::operator[] non-throwing.  I&apos;ve updated the summary/description to reflect this, and changed the type of the ticket to &quot;Bug&quot;.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=Weltenbummler&quot; class=&quot;user-hover&quot; rel=&quot;Weltenbummler&quot;&gt;Weltenbummler&lt;/a&gt;: instead of your original suggestion of improving the error message, we&apos;ve decided to remove the throwing behavior altogether.  In your example, &lt;tt&gt;blubb[&quot;jolo&quot;][1]&lt;/tt&gt; will evaluate to an invalid element (which is false in a boolean context), instead of throwing.&lt;/p&gt;</comment>
                            <comment id="1408012" author="david.golden" created="Thu, 13 Oct 2016 22:06:18 +0000"  >&lt;p&gt;I haven&apos;t stack traced it, but I think the error is coming the &lt;tt&gt;type()&lt;/tt&gt; call in the &lt;tt&gt;operator[]&lt;/tt&gt; methods:&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;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;bsoncxx::type element::type() const {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;    if (_raw == nullptr) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;        throw bsoncxx::exception{error_code::k_unset_element};&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;/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;    // ... rest omitted ... &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;/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;&amp;nbsp;&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;element element::operator[](stdx::string_view key) const {&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;    if (type() != bsoncxx::type::k_document) return element();&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;    // ... rest omitted ... &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;/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;&amp;nbsp;&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;array::element element::operator[](std::uint32_t i) const {&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;    if (type() != bsoncxx::type::k_array) return array::element();&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;    // ... rest omitted ... &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;}&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;We could instead first check for an empty element in the &lt;tt&gt;operator[]&lt;/tt&gt; methods:&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;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;if ( _raw==nullptr || type() != bsoncxx::type::k_document ) return element();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;That returns an empty element (which would evaluate as false).  It could also throw a more informative exception (&quot;not an array&quot; instead of &quot;unset element&quot;), but I&apos;d be fine with allowing Armin&apos;s original case &lt;tt&gt;if ( blubb[&quot;jolo&quot;][1] )&lt;/tt&gt; to be false without an exception for convenience to avoid &lt;tt&gt;if ( blubb[&quot;jolo&quot;] &amp;amp;&amp;amp; blubb[&quot;jolo&quot;][1] )&lt;/tt&gt; for deeply nested fields.&lt;/p&gt;

&lt;p&gt;That&apos;s a simple enough change that if we agree to do it that way, we could even pull it up into 3.1-desired.&lt;/p&gt;</comment>
                            <comment id="1407789" author="weltenbummler" created="Thu, 13 Oct 2016 18:54:17 +0000"  >&lt;p&gt;&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;</comment>
                            <comment id="1407748" author="david.golden" created="Thu, 13 Oct 2016 18:27:34 +0000"  >&lt;p&gt;You raise some good points.  We&apos;ll try to find a way to clarify that behavior.&lt;/p&gt;</comment>
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