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14 lines
210 B
C++

#include "../Eigen/Core"
using namespace Eigen;
int main()
{
VectorXf a(10), b(10);
VectorXf const &ac(a);
#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
b.swap(ac);
#else
b.swap(ac.const_cast_derived());
#endif
}