trivialpreconditioner.hh

Go to the documentation of this file.

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*                                                                           */
/*  This file is part of the library KASKADE 7                               */
/*  https://www.zib.de/research/projects/kaskade7-finite-element-toolbox     */
/*                                                                           */
/*  Copyright (C) 2002-2025 Zuse Institute Berlin                            */
/*                                                                           */
/*  KASKADE 7 is distributed under the terms of the ZIB Academic License.    */
/*    see $KASKADE/academic.txt                                              */
/*                                                                           */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
#ifndef TRIVIALPRECONDITIONER_HH
#define TRIVIALPRECONDITIONER_HH
 
#include "linalg/symmetricOperators.hh"
 
// #include "dune/istl/preconditioners.hh"
// #include "dune/istl/solvercategory.hh"
 
namespace Kaskade
{

  template <class Operator>
  class TrivialPreconditioner: public SymmetricPreconditioner<typename Operator::domain_type,typename Operator::range_type>
  {
  public:
    using field_type = typename Operator::field_type;
    using domain_type = typename Operator::domain_type;
    using range_type = typename Operator::range_type;
    
    virtual void pre (domain_type&, range_type&) {}
    virtual void apply (domain_type& x, range_type const& y) { x = y; }
    virtual void post (domain_type&) {}
    
    virtual field_type applyDp(domain_type& x, range_type const& y) override
    { 
      x = y;
      return x*y;
    }
    
    virtual bool requiresInitializedInput() const override
    {
      return false;
    }
    
    virtual Dune::SolverCategory::Category category() const override
    {
      return Dune::SolverCategory::sequential;
    }
  };
  
} // namespace Kaskade
#endif