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    CWG Issue 1363</TITLE>
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<P><EM>This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21
  Core Issues List revision 118b.
  See http://www.open-std.org/jtc1/sc22/wg21/ for the official
  list.</EM></P>
<P>2025-09-28</P>
<HR>
<A NAME="1363"></A><H4>1363.
  
Triviality vs multiple default constructors
</H4>
<B>Section: </B>Clause 11&#160; [<A href="https://wg21.link/class">class</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD3
 &#160;&#160;&#160;

 <B>Submitter: </B>Sean Hunt
 &#160;&#160;&#160;

 <B>Date: </B>2011-08-16<BR>


<P>[Moved to DR at the October, 2012 meeting.]</P>



<P>The requirements for a trivial class include having &#8220;a trivial
default constructor&#8221; (Clause 11 [<A href="https://wg21.link/class#6">class</A>] paragraph 6).
However, with an explicitly-defaulted default constructor and other
constructors with default arguments, it is possible to have multiple
default constructors.  Such a class cannot be default-initialized and
thus should probably be considered non-trivial.</P>

<P><B>Proposed resolution (February, 2012):</B></P>

<P>Change Clause 11 [<A href="https://wg21.link/class#6">class</A>] paragraph 6 as follows:</P>

<BLOCKQUOTE>

...A <I>trivial class</I> is a class that has a <DEL>trivial</DEL>
default constructor (11.4.5 [<A href="https://wg21.link/class.ctor">class.ctor</A>])<INS>, has no
non-trivial default constructors,</INS> and is trivially
copyable...

</BLOCKQUOTE>

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