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

2337. Incorrect implication of logic ladder for conversion sequence tiebreakers

The bulleted list of 12.2.4.3 [over.ics.rank] paragraph 3 consists of a logic ladder of the form “A is better than B if [some predicate relating A to B], or, if not that, ...” For example, bullet 3.1 says,

• List-initialization sequence L1 is a better conversion sequence than list-initialization sequence L2 if

• L1 converts to std::initializer_list<X> for some X and L2 does not, or, if not that,

• L1 converts to type “array of N1 T”, L2 converts to type “array of N2 T”, and N1 is smaller than N2 ,

The intent is not to fall into the array case if L2 converts to std::initializer_list<X> and L1 does not — i.e., the inverse predicate holds — but that intent is not well reflected in the actual wording.