Expression.h

// Copyright (C) 2009 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:  2009-09-28
// Last changed: 2011-08-15

#ifndef __EXPRESSION_H
#define __EXPRESSION_H

#include <vector>
#include <ufc.h>
#include <Eigen/Dense>
#include <dolfin/common/Array.h>
#include "GenericFunction.h"

namespace dolfin
{

  class Mesh;


  class Expression : public GenericFunction
  {

  public:

    Expression();

    explicit Expression(std::size_t dim);

    Expression(std::size_t dim0, std::size_t dim1);

    explicit Expression(std::vector<std::size_t> value_shape);

    Expression(const Expression& expression);

    virtual ~Expression();

    //--- Implementation of GenericFunction interface ---

    virtual void eval(Array<double>& values,
                      const Array<double>& x,
                      const ufc::cell& cell) const override;

    virtual void eval(Eigen::Ref<Eigen::VectorXd> values,
                      Eigen::Ref<const Eigen::VectorXd> x,
                      const ufc::cell& cell) const override;

    virtual void eval(Array<double>& values, const Array<double>& x) const override;

    virtual void eval(Eigen::Ref<Eigen::VectorXd> values,
                      Eigen::Ref<const Eigen::VectorXd> x) const override;

    virtual std::size_t value_rank() const override;

    virtual std::size_t value_dimension(std::size_t i) const override;

    virtual std::vector<std::size_t> value_shape() const override;

    virtual void set_property(std::string name, double value);

    virtual double get_property(std::string name) const;

    virtual void set_generic_function(std::string name, std::shared_ptr<GenericFunction> f);

    virtual std::shared_ptr<dolfin::GenericFunction> get_generic_function(std::string name) const;

    virtual void restrict(double* w,
                          const FiniteElement& element,
                          const Cell& dolfin_cell,
                          const double* coordinate_dofs,
                          const ufc::cell& ufc_cell) const override;

    virtual void compute_vertex_values(std::vector<double>& vertex_values,
                                       const Mesh& mesh) const override;

    virtual std::shared_ptr<const FunctionSpace> function_space() const override;

  protected:

    // Value shape
    std::vector<std::size_t> _value_shape;

  };

}

#endif