This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 116a. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.

2024-12-19

1254. odr-use vs template arguments and constexpr functions

Section: 6.3  [basic.def.odr]     Status: NAD     Submitter: Nikolay Ivchenkov     Date: 2011-03-08

The relationship between when an expression is potentially evaluated, especially with respect to contexts requiring constant expressions, and non-type template arguments is not clear and should be clarified. In particular, it seems that these contexts should be potentially-evaluated.

See also issue 1378.

Additional note, January, 2012:

Further discussion indicates that this is not a defect and should be closed as such.

Notes from the February, 2012 meeting:

CWG determined that the current wording is clear enough that an instantiation is required whenever it affects the semantics of the program.