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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-1636] Conflict with &lt;windows.h&gt;. Different include order lead to different result.</title>
                <link>https://jira.mongodb.org/browse/CXX-1636</link>
                <project id="11980" key="CXX">C++ Driver</project>
                    <description>&lt;p&gt;&#160;&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: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;int&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; main() {&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;&lt;br/&gt;
&#160;This can complie success.&lt;/p&gt;

&lt;p/&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;#include &amp;lt;windows.h&amp;gt;&lt;/span&gt;&lt;/pre&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;#include &amp;lt;mongocxx/client.hpp&amp;gt;&lt;/span&gt;&lt;/pre&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: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;int&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; main() {&lt;/span&gt;&lt;/pre&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;    &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;return&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;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0&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;
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&lt;p/&gt;
&lt;p&gt;This cause strange error.&lt;br/&gt;
Error (active)	E0145	member &quot;bsoncxx::v_noabi::types::b_double::type_id&quot; may not be initialized.&lt;/p&gt;</description>
                <environment>OS: windows 10&lt;br/&gt;
compiler: visual studio 2017&lt;br/&gt;
</environment>
        <key id="586066">CXX-1636</key>
            <summary>Conflict with &lt;windows.h&gt;. Different include order lead to different result.</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="drinkmystery">drink</reporter>
                        <labels>
                            <label>Bug</label>
                            <label>neweng</label>
                    </labels>
                <created>Thu, 9 Aug 2018 16:17:34 +0000</created>
                <updated>Wed, 7 Feb 2024 12:36:17 +0000</updated>
                                            <version>3.3.1</version>
                                                    <component>Documentation</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1990242" author="jesse" created="Thu, 30 Aug 2018 18:48:19 +0000"  >&lt;p&gt;Warn users to define NOMINMAX when compiling with MSVC, then close.&lt;/p&gt;

&lt;p&gt;(Consider an extra pragma warning during the build, too.)&lt;/p&gt;</comment>
                            <comment id="1976052" author="drinkmystery" created="Wed, 15 Aug 2018 00:58:48 +0000"  >&lt;p&gt;Thx very much.&lt;/p&gt;

&lt;p&gt;&quot;Defining &lt;tt&gt;NOMINMAX&lt;/tt&gt; is standard practice in modern Windows C++ projects.&quot;&lt;/p&gt;

&lt;p&gt;I have learned it now.&lt;/p&gt;</comment>
                            <comment id="1975385" author="acm" created="Tue, 14 Aug 2018 15:02:43 +0000"  >&lt;p&gt;Some things to note here:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;You should always include the windows headers &lt;b&gt;first&lt;/b&gt;, before including basically any other headers (C++ standard library, MongoDB drivers, boost, etc.).&lt;/li&gt;
	&lt;li&gt;You can work around this particular collision by adding &lt;tt&gt;#define NOMINMAX&lt;/tt&gt; before including the Windows headers.&lt;/li&gt;
	&lt;li&gt;The C++ driver could potentially do that itself in the &lt;tt&gt;prelude/postlude&lt;/tt&gt; headers, but I don&apos;t see much advantage to doing so. Defining &lt;tt&gt;NOMINMAX&lt;/tt&gt; is standard practice in modern Windows C++ projects, and I don&apos;t want to pollute our headers with papering over other systems legacy issues.&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="1975273" author="jesse" created="Tue, 14 Aug 2018 13:45:00 +0000"  >&lt;p&gt;Possibly with push_macro:&#160;&lt;a href=&quot;https://stackoverflow.com/questions/1543736/how-do-i-temporarily-disable-a-macro-expansion-in-c-c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://stackoverflow.com/questions/1543736/how-do-i-temporarily-disable-a-macro-expansion-in-c-c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1975267" author="jesse" created="Tue, 14 Aug 2018 13:42:43 +0000"  >&lt;p&gt;Looks like the error in options/find.hpp:216 is the root cause: windows.h defines &#8220;max&#8221; as a macro, and find.hpp tries to declare &#8220;max&#8221; as a member function. After macro substitution find.hpp cannot compile. I don&#8217;t know if there&#8217;s a way to change find.hpp so that it compiles if it&#8217;s included after windows.h.&lt;/p&gt;</comment>
                            <comment id="1975003" author="drinkmystery" created="Tue, 14 Aug 2018 05:39:44 +0000"  >&lt;p&gt;I am using Visual Studio 2017.&lt;/p&gt;

&lt;p&gt;I tried the &quot;__STDC_LIMIT_MACROS&quot; preprocessor definition, it didnot work.&lt;/p&gt;

&lt;p&gt;I have attach the output.&lt;/p&gt;</comment>
                            <comment id="1973079" author="jesse" created="Fri, 10 Aug 2018 21:40:24 +0000"  >&lt;p&gt;That is odd. I only have a Visual Studio 2015 environment handy, and I can&apos;t reproduce the error there. Could you attach the full output from the Visual Studio &quot;output&quot; tab here so we can see all the messages?&lt;/p&gt;

&lt;p&gt;What happens if you open the project properties, go to &quot;C/C++&quot; &quot;Preprocessor&quot; &quot;Preprocessor definitions&quot;, and add the preprocessor definition __STDC_LIMIT_MACROS ?&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="193931" name="CMakeLists.txt" size="943" author="drinkmystery" created="Tue, 14 Aug 2018 05:36:19 +0000"/>
                            <attachment id="193930" name="buildOutput.txt" size="27177" author="drinkmystery" created="Tue, 14 Aug 2018 05:36:19 +0000"/>
                            <attachment id="193932" name="main.cpp" size="88" author="drinkmystery" created="Tue, 14 Aug 2018 05:36:19 +0000"/>
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