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    CWG Issue 869</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="869"></A><H4>869.
  
Uninitialized <TT>thread_local</TT> objects
</H4>
<B>Section: </B>9.5&#160; [<A href="https://wg21.link/dcl.init">dcl.init</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD2
 &#160;&#160;&#160;

 <B>Submitter: </B>Daniel Kr&#252;gler
 &#160;&#160;&#160;

 <B>Date: </B>14 April, 2009<BR>


<P>[Voted into WP at March, 2010 meeting.]</P>



<P>9.5 [<A href="https://wg21.link/dcl.init#11">dcl.init</A>] paragraph 11 says,</P>

<BLOCKQUOTE>

If no initializer is specified for an object, the object is
default-initialized; if no initialization is performed, a non-static
object has indeterminate value.

</BLOCKQUOTE>

<P>This is inaccurate, because objects with thread storage duration
are zero-initialized (6.10.3.2 [<A href="https://wg21.link/basic.start.static#2">basic.start.static</A>] paragraph 2).</P>

<P><B>Proposed resolution (November, 2009):</B></P>

<P>Change 9.5 [<A href="https://wg21.link/dcl.init#11">dcl.init</A>] paragraph 11 as follows:</P>

<BLOCKQUOTE>

If no initializer is specified for an object, the object is
default-initialized; if no initialization is performed, <DEL>a
non-static</DEL> <INS>an</INS> object <INS>with automatic or dynamic
storage duration</INS> has indeterminate value.  [<I>Note:</I> objects
with static <INS>or thread</INS> storage duration are
zero-initialized, see 6.10.3.2 [<A href="https://wg21.link/basic.start.static">basic.start.static</A>]<INS>.</INS> &#8212;<I>end
note</I>]<DEL>.</DEL>

</BLOCKQUOTE>

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