https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106291
Bug ID: 106291
Summary: Literal class can appear in the constant-expression of
a declaration of a bit-field
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: xmh970252187 at gmail dot com
Target Milestone: ---
struct A{
constexpr operator int(){
return 8;
}
};
struct B{
int a:A{};
};
GCC rejects this example, with a diagnosis that
> error: width of bit-field 'a' has non-integral type 'A'
[expr.const] p9 explicitly permit this case.
> If an expression of literal class type is used in a context where an integral
> constant expression is required, then that expression is contextually
> implicitly converted ([conv]) to an integral or unscoped enumeration type and
> the selected conversion function shall be constexpr.
Clang accepts this example
