LinearOperator.h

// Copyright (C) 2012 Anders Logg
//
// This file is part of DOLFIN.
//
// DOLFIN is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// DOLFIN is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
// // You should have received a copy of the GNU Lesser General Public License
// along with DOLFIN. If not, see <http://www.gnu.org/licenses/>.
//
// First added:  2012-08-20
// Last changed: 2012-12-12
 
#ifndef __LINEAR_OPERATOR_H
#define __LINEAR_OPERATOR_H
 
#include <memory>
#include <dolfin/common/MPI.h>
#include "GenericLinearOperator.h"
 
namespace dolfin
{

  class LinearOperator : public GenericLinearOperator
  {
  public:

    LinearOperator();

    LinearOperator(const GenericVector& x, const GenericVector& y);

    virtual ~LinearOperator() {}

    virtual std::size_t size(std::size_t dim) const = 0;

    virtual void mult(const GenericVector& x, GenericVector& y) const = 0;

    virtual MPI_Comm mpi_comm() const
    { dolfin_assert(_matA); return _matA->mpi_comm(); }

    std::string str(bool verbose) const;
 
    //--- Special functions, intended for library use only ---

    virtual const GenericLinearOperator* instance() const;

    virtual GenericLinearOperator* instance();

    virtual std::shared_ptr<const LinearAlgebraObject> shared_instance() const;

    virtual std::shared_ptr<LinearAlgebraObject> shared_instance();
 
  private:
 
    // Pointer to concrete implementation
    std::shared_ptr<GenericLinearOperator> _matA;
 
  };
 
}
 
#endif