Jelly Bean MR1  |  4.2.2_r1
C++程序  |  16行  |  228 B 

#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> d(m);
}

int main() {}