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 9 using namespace Eigen; 10 11 void foo(){ 12 Matrix3f m; 13 Block<CV_QUALIFIER Matrix3f>(m, 0, 0, 3, 3).coeffRef(0, 0) = 1.0f; 14 } 15 16 int main() {} 17