1 #include "../Eigen/Sparse" 2 3 using namespace Eigen; 4 call_ref(Ref<SparseMatrix<float>> a)5void call_ref(Ref<SparseMatrix<float> > a) { } 6 main()7int main() 8 { 9 SparseMatrix<float> A(10,10); 10 #ifdef EIGEN_SHOULD_FAIL_TO_BUILD 11 call_ref(A.row(3)); 12 #else 13 call_ref(A.col(3)); 14 #endif 15 } 16