1#include "../Eigen/Core" 2 3#ifdef EIGEN_SHOULD_FAIL_TO_BUILD 4#define CV_QUALIFIER const 5#else 6#define CV_QUALIFIER 7#endif 8 9using namespace Eigen; 10 11void foo(){ 12 Matrix3f m; 13 Block<CV_QUALIFIER Matrix3f>(m, 0, 0, 3, 3).coeffRef(0, 0) = 1.0f; 14} 15 16int main() {} 17