cpp/src/librosa/eigen3/failtest/sparse_ref_1.cpp

#include "../Eigen/Sparse"

#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
#define CV_QUALIFIER const
#else
#define CV_QUALIFIER
#endif

using namespace Eigen;

void call_ref(Ref<SparseMatrix<float> > a) { }

int main()
{
  SparseMatrix<float> a(10,10);
  CV_QUALIFIER SparseMatrix<float>& ac(a);
  call_ref(ac);
}