Commit 45d34aad authored by Kilian Weishaupt's avatar Kilian Weishaupt Committed by Timo Koch
Browse files

[newtonsolver] Use linearSolver.norm() if available

* fall back to assembler.residualNorm() otherwise
parent 2d9ea6d6
......@@ -74,6 +74,14 @@ using DetectPVSwitch = typename Assembler::GridVariables::VolumeVariables::Prima
template<class Assembler>
using GetPVSwitch = Dune::Std::detected_or<int, DetectPVSwitch, Assembler>;
// helper struct and function detecting if the linear solver features a norm() function
template <class LinearSolver, class Residual>
using NormDetector = decltype(std::declval<LinearSolver>().norm(std::declval<Residual>()));
template<class LinearSolver, class Residual>
static constexpr bool hasNorm()
{ return Dune::Std::is_detected<NormDetector, LinearSolver, Residual>::value; }
// helpers to implement max relative shift
template<class C> using dynamicIndexAccess = decltype(std::declval<C>()[0]);
template<class C> using staticIndexAccess = decltype(std::declval<C>()[Dune::Indices::_0]);
......@@ -785,7 +793,11 @@ protected:
void computeResidualReduction_(const SolutionVector &uCurrentIter)
residualNorm_ = this->assembler().residualNorm(uCurrentIter);
if constexpr (Detail::hasNorm<LinearSolver, SolutionVector>())
residualNorm_ = this->linearSolver().norm(uCurrentIter);
residualNorm_ = this->assembler().residualNorm(uCurrentIter);
reduction_ = residualNorm_;
reduction_ /= initialResidual_;
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