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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>[CXX-1246] bsoncxx::builder::stream::single_context should not permit appending of multiple values</title>
                <link>https://jira.mongodb.org/browse/CXX-1246</link>
                <project id="11980" key="CXX">C++ Driver</project>
                    <description>&lt;p&gt;bsoncxx::builder::stream::single_context is written to accept a single value to be appended to the stream, but it is currently possible to append multiple values through use of open_document and open_array:&lt;/p&gt;

&lt;p/&gt;
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					&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;auto doc = document{} &amp;lt;&amp;lt; &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;x&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; &amp;lt;&amp;lt; [](single_context s) {&lt;/span&gt;&lt;/pre&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;    s &amp;lt;&amp;lt; open_array &amp;lt;&amp;lt; 0 &amp;lt;&amp;lt; close_array &amp;lt;&amp;lt; open_array &amp;lt;&amp;lt; 1 &amp;lt;&amp;lt; close_array;&lt;/span&gt;&lt;/pre&gt;
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					&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;} &amp;lt;&amp;lt; finalize;&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;The above code currently compiles, and throws an exception with a confusing message &quot;expected a key but found none&quot; at runtime.  Instead, this code should not compile.&lt;/p&gt;

&lt;p&gt;The code erroneously compiles due to the fact that the following functions have the wrong return type.  The return type of these functions are currently key_context&amp;lt;single_context&amp;gt; and array_context&amp;lt;single_context&amp;gt;, respectively, but they should be key_context&amp;lt;closed_context&amp;gt; and array_context&amp;lt;closed_context&amp;gt; instead.&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&lt;tt&gt;bsoncxx::builder::stream::single_context::operator&amp;lt;&amp;lt;(open_document_type)&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;bsoncxx::builder::stream::single_context::operator&amp;lt;&amp;lt;(open_array_type)&lt;/tt&gt;&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="362343">CXX-1246</key>
            <summary>bsoncxx::builder::stream::single_context should not permit appending of multiple values</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="rassi">J Rassi</assignee>
                                    <reporter username="rassi">J Rassi</reporter>
                        <labels>
                    </labels>
                <created>Tue, 7 Mar 2017 23:24:39 +0000</created>
                <updated>Thu, 16 Mar 2017 00:26:52 +0000</updated>
                            <resolved>Thu, 16 Mar 2017 00:26:52 +0000</resolved>
                                                    <fixVersion>3.2.0-rc0</fixVersion>
                                    <component>API</component>
                    <component>BSON</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1525330" author="xgen-internal-githook" created="Thu, 16 Mar 2017 00:26:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jrassi&apos;, u&apos;name&apos;: u&apos;J. Rassi&apos;, u&apos;email&apos;: u&apos;rassi@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CXX-1246&quot; title=&quot;bsoncxx::builder::stream::single_context should not permit appending of multiple values&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CXX-1246&quot;&gt;&lt;del&gt;CXX-1246&lt;/del&gt;&lt;/a&gt; single_context shouldn&apos;t permit appending of multiple values&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-cxx-driver/commit/8b2a1d3a6993372040d9f9e781ac386137cbbf6e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-cxx-driver/commit/8b2a1d3a6993372040d9f9e781ac386137cbbf6e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1520506" author="rassi@10gen.com" created="Thu, 9 Mar 2017 22:11:03 +0000"  >&lt;p&gt;Per discussion with &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;, putting this into 3.2.0-rc0.  Note that the fix for this issue involves an API change.&lt;/p&gt;</comment>
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