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    CWG Issue 1320</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="1320"></A><H4>1320.
  
Converting scoped enumerations to <TT>bool</TT>
</H4>
<B>Section: </B>7.6.1.9&#160; [<A href="https://wg21.link/expr.static.cast">expr.static.cast</A>]
 &#160;&#160;&#160;

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

 <B>Submitter: </B>Jonathan Wakely
 &#160;&#160;&#160;

 <B>Date: </B>2011-05-18<BR>


<P>[Moved to DR at the April, 2013 meeting.]</P>



<P>The specification of <TT>static_cast</TT> (7.6.1.9 [<A href="https://wg21.link/expr.static.cast">expr.static.cast</A>])
does not describe conversion of a scoped enumeration value to
<TT>bool</TT>.  Presumably it should be handled as for unscoped
enumerations, with a zero value becoming <TT>false</TT> and a non-zero
value becoming <TT>true</TT>.
</P>

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

<P>Change 7.6.1.9 [<A href="https://wg21.link/expr.static.cast#9">expr.static.cast</A>] paragraph 9 as follows:</P>

<BLOCKQUOTE>

A value of a scoped enumeration type (9.8.1 [<A href="https://wg21.link/dcl.enum">dcl.enum</A>]) can be
explicitly converted to an integral type.  <DEL>The</DEL> <INS>When
that type is <I>cv</I> <TT>bool</TT>, the resulting value is
<TT>false</TT> if the original value is zero and <TT>true</TT> for all
other values.  For the remaining integral types, the</INS> value is
unchanged if the original value can be represented by the specified
type.  Otherwise, the resulting value is unspecified.

</BLOCKQUOTE>

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