Marshmallow  |  6.0.1_r16
C++程序  |  16行  |  245 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){
    Block<Matrix3d,3,3> b(m.block<3,3>(0,0));
}

int main() {}