#include <Eigen/PaStiXSupport> template <class SOLVER> void f() { SOLVER solver; solver.iparm(); solver.dparm(); } template void f<PastixSolverLDLT>(); template void f<PastixSolverLLT>(); template void f<PastixSolverLU>(); The code above does not compile, it results in the following error messages, for the three decompositions and both iparm and dparm. error: invalid initialization of reference of type ‘Eigen::Array<int, 128, 1, 0, 128, 1>&’ from expression of type ‘Eigen::Matrix<int, 128, 1>’ return m_iparm; error: invalid initialization of reference of type ‘Eigen::Array<double, 128, 1, 0, 128, 1>&’ from expression of type ‘Eigen::Matrix<double, 64, 1>’ return m_dparm;
https://bitbucket.org/eigen/eigen/commits/5e21a9ed6231/
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