1 #include "../Eigen/Core" 2 3 using namespace Eigen; 4 call_ref(Ref<VectorXf> a)5 void call_ref(Ref<VectorXf> a) { } 6 main()7 int 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