1#include "../Eigen/Core" 2 3using namespace Eigen; 4 5void call_ref(Ref<VectorXf> a) { } 6 7int main() 8{ 9 VectorXf a(10); 10 DenseBase<VectorXf> &ac(a); 11#ifdef EIGEN_SHOULD_FAIL_TO_BUILD 12 call_ref(ac); 13#else 14 call_ref(ac.derived()); 15#endif 16} 17