32   Derived& derived() { return *static_cast<Derived*>(this); }  in derived()  function
33   const Derived& derived() const { return *static_cast<const Derived*>(this); }  in derived()  function
71     return derived();  in analyzePattern()
90     return derived();  in factorize()
111     return derived();  in compute()
126     return derived();  in setTolerance()
145     return derived();  in setMaxIterations()
172     return internal::solve_retval<Derived, Rhs>(derived(), b.derived());  in solve()
186     return internal::sparse_solve_retval<IterativeSolverBase, Rhs>(*this, b.derived());  in solve()
209       tx = derived().solve(tb);  in _solve_sparse()
246     dec().derived()._solve_sparse(rhs(),dst);