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            <title>[SERVER-6059] Derived types, and types with constructors, destructors or virtual methods are not POD in C++</title>
                <link>https://jira.mongodb.org/browse/SERVER-6059</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The pre-C+&lt;ins&gt;11 standard for C&lt;/ins&gt;+ does not confer POD-ness on derived types (subclasses), types with non-default constructors, non-default destructors, non-public non-static members,  or virtual methods, or types that contain non-POD types.&lt;/p&gt;

&lt;p&gt;C++11 defines a slightly more relaxed notion, called Standard Layout Types, which can have at most 1 superclass with non-static data members, plus some other rules, that is typically what we&apos;re after.&lt;/p&gt;

&lt;p&gt;I don&apos;t have a recommended course of action, right now, but we&apos;re definitely relying on staying in the compiler&apos;s good graces, right now.  One problem with non-POD types is that GCC won&apos;t let you use the offsetof() builtin to verify that the structure has the layout you desire, which means no static assertions that the structures have the expected shape in memory.&lt;/p&gt;

&lt;p&gt;The following is an &lt;em&gt;incomplete&lt;/em&gt; list of types where we count on the compiler choosing a particular layout, but the type itself is non-POD:&lt;/p&gt;

&lt;p&gt;BSONObj::Holder&lt;br/&gt;
QueryResult&lt;br/&gt;
OpTime?&lt;br/&gt;
MaxKeyData&lt;br/&gt;
MinKeyData&lt;br/&gt;
JHeader&lt;br/&gt;
JSectFooter&lt;br/&gt;
DiskLoc&lt;br/&gt;
AtomicUInt&lt;br/&gt;
AtomicWord&amp;lt;T&amp;gt; (AtomicUInt64, AtomicUInt32)&lt;/p&gt;</description>
                <environment></environment>
        <key id="40959">SERVER-6059</key>
            <summary>Derived types, and types with constructors, destructors or virtual methods are not POD in C++</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="schwerin@mongodb.com">Andy Schwerin</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Mon, 11 Jun 2012 13:56:26 +0000</created>
                <updated>Mon, 12 Jan 2015 15:50:53 +0000</updated>
                            <resolved>Mon, 12 Jan 2015 15:50:53 +0000</resolved>
                                                                    <component>Internal Code</component>
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