swap_2.cpp 210 Bytes

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#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
}