This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 115e. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2024-11-11
According to 7.6.2.5 [expr.sizeof] paragraph 1,
The sizeof operator shall not be applied to an expression that has function or incomplete type, to an enumeration type whose underlying type is not fixed before all its enumerators have been declared, to an array of runtime bound, to the parenthesized name of such types, or to a glvalue that designates a bit-field.
However, it is not possible to name the type of an array of runtime bound, neither by typedef nor decltype, so the reference to “the parenthesized name of such types” should precede rather than follow “to an array of unknown bound.”
Rationale (September, 2013):
Arrays of runtime bound were moved from the normative specification to a proposed Technical Specification.