This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 114a. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2024-04-18
[Adopted at the February/March, 2017 meeting.]
P0138R2 adds a new bullet for enum initialization after bullet 8 of 9.4.5 [dcl.init.list] paragraph 3. However, paragraph 7 already dealt with all the cases where the initializer list contains a single element and the target type is a non-reference type, so the new paragraph 9 rule is unreachable.
Proposed resolution (December, 2016):
Reorder the bullets in 9.4.5 [dcl.init.list] paragraph 3 as follows:
List-initialization of an object or reference of type T is defined as follows:
...
Otherwise, if T is a class type, constructors are considered...
Otherwise, if T is an enumeration with a fixed underlying type (9.7.1 [dcl.enum]), the initializer-list has a single element v, and the initialization is direct-list-initialization, the object is initialized with the value T(v) (7.6.1.4 [expr.type.conv]); if a narrowing conversion is required to convert v to the underlying type of T, the program is ill-formed. [Example:...
Otherwise, if the initializer list has a single element of type E...
Otherwise, if T is a reference type...
Otherwise, if T is an enumeration with a fixed underlying type...