vtable_inator.cpp

std::string vtable_inator(const auto& any) {
    struct h { void** name; };
    return std::string(reinterpret_cast<char*>(reinterpret_cast<void**>(reinterpret_cast<const h*>(&any)->name[-1])[1]));
}

struct vtable_inator_able { virtual void nothing() final {}; };

struct Hello_world : vtable_inator_able {};

int main() {
    std::print("{}\n", vtable_inator(Hello_world()));
}