https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95915
Bug ID: 95915
Summary: std::variant doesn't like types with a defaulted
virtual destructor
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: ville.voutilainen at gmail dot com
Target Milestone: ---
>From Patrice Roy:
The following code compiled in C++17 but seems broken in C++20, at least
according the Clang and gcc:
#include <variant>
struct X {
virtual ~X() = default;
};
int main() {
std::variant<X> v;
}
This is because variant's storage uses an _Uninitialized type that hacks
around a compiler bug, where the type X above wasn't literal. Now that it
is, the hack breaks. Since variant's other base-layers handle triviality
of special member functions properly, this hack can now be removed.
