const_qualified_diagonal_method_retval.cpp

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#include "../Eigen/Core"
 
#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
#define CV_QUALIFIER const
#else
#define CV_QUALIFIER
#endif
 
using namespace Eigen;
 
void foo(CV_QUALIFIER Matrix3d &m){
    Diagonal<Matrix3d> b(m.diagonal());
}
 
int main() {}