preconditioner.hh

// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_ISTL_PRECONDITIONER_HH
#define DUNE_ISTL_PRECONDITIONER_HH
namespace Dune {
  //=====================================================================
  //=====================================================================
  template<class X, class Y>
  class Preconditioner {
  public:
    typedef X domain_type;
    typedef Y range_type;
    typedef typename X::field_type field_type;
 
    virtual void pre (X& x, Y& b) = 0;
 
    virtual void apply (X& v, const Y& d) = 0;
 
    virtual void post (X& x) = 0;
 
    // every abstract base class has a virtual destructor
    virtual ~Preconditioner () {}
  };
 
}
#endif