Method GetTrace

fem/diffop.hpp:455–461

    virtual IntRange UsedDofs(const FiniteElement & fel) const override { return IntRange(0, fel.GetNDof()); }

    shared_ptr<DifferentialOperator> GetTrace() const override
    {
      if (auto diffoptrace = diffop->GetTrace())      
        return make_shared<VectorDifferentialOperator> (diffoptrace, dim);
      else
        return nullptr;
    }

    virtual void CheckElement (const FiniteElement& bfel) const override;