This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 110b. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.

2023-01-15


457. Wording nit on use of const variables in constant expressions

Section: 7.7  [expr.const]     Status: CD1     Submitter: Mark Mitchell     Date: 03 Feb 2004

[Voted into WP at April 2005 meeting.]

I'm looking at 7.7 [expr.const]. I see:

An integral constant-expression can involve only ... const variables or static data members of integral or enumeration types initialized with constant expressions ...

Shouldn't that be "const non-volatile"?

It seems weird to say that:

  const volatile int i = 3;
  int j[i];
is valid.

Steve Adamczyk: See issue 76, which made the similar change to 9.2.9.2 [dcl.type.cv] paragraph 2, and probably should have changed this one as well.

Proposed resolution (October, 2004):

Change the first sentence in the second part of 7.7 [expr.const] paragraph 1 as follows:

An integral constant-expression can involve only literals of arithmetic types (5.13 [lex.literal], 6.8.2 [basic.fundamental]), enumerators, non-volatile const variables or static data members of integral or enumeration types initialized with constant expressions (9.4 [dcl.init]), non-type template parameters of integral or enumeration types, and sizeof expressions.