This seems to fail on ubuntu 18.04.5 with Clang 9 due to: Error output: error: Couldn't lookup symbols: std::__1::default_delete<int>::operator()(int) const
This seems to fail on ubuntu 18.04.5 with Clang 9 due to: Error output: error: Couldn't lookup symbols: std::__1::default_delete<int>::operator()(int) const