This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 118e. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2025-11-05
[Adopted at the February, 2016 meeting.]
According to 9.3.4.5 [dcl.array] paragraph 3,
An array bound may also be omitted when the declarator is followed by an initializer (9.5 [dcl.init]). In this case the bound is calculated from the number of initial elements...
However, the grammar for member-declarator uses brace-or-equal-initializer, not initializer, so the following is ill-formed:
struct X {
static constexpr int arr[] = { 1, 2, 3 };
};
Proposed resolution (October, 2015):
Change 9.3.4.5 [dcl.array] paragraph 3 as follows:
...An array bound may also be omitted when the declarator is followed by an initializer (9.5 [dcl.init]) or when a declarator for a static data member is followed by a brace-or-equal-initializer (11.4 [class.mem]). Inthis caseboth cases the bound is calculated from the number of initial elements...