namespace StormEigen {
  namespace internal {
    template <class ArgType>
    struct traits<Circulant<ArgType> >
    {
      typedef StormEigen::Dense StorageKind;
      typedef StormEigen::MatrixXpr XprKind;
      typedef typename ArgType::StorageIndex StorageIndex;
      typedef typename ArgType::Scalar Scalar;
      enum { 
        Flags = StormEigen::ColMajor,
        RowsAtCompileTime = ArgType::RowsAtCompileTime,
        ColsAtCompileTime = ArgType::RowsAtCompileTime,
        MaxRowsAtCompileTime = ArgType::MaxRowsAtCompileTime,
        MaxColsAtCompileTime = ArgType::MaxRowsAtCompileTime
      };
    };
  }
}