length_visitor.hh

// length_visitor.hh: this file is part of the Vaucanson project.
//
// Vaucanson, a generic library for finite state machines.
//
// Copyright (C) 2005 The Vaucanson Group.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// The complete GNU General Public Licence Notice can be found as the
// `COPYING' file in the root directory.
//
// The Vaucanson Group consists of people listed in the `AUTHORS' file.
//
#ifndef VCSN_ALGEBRA_IMPLEMENTATION_SERIES_RAT_LENGTH_VISITOR_HH
# define VCSN_ALGEBRA_IMPLEMENTATION_SERIES_RAT_LENGTH_VISITOR_HH


# include <cstddef>

# include <vaucanson/algebra/implementation/series/rat/nodes.hh>

namespace vcsn {

  namespace rat {

    template<typename M_, typename W_>
    class LengthVisitor : public ConstNodeVisitor<M_, W_>
    {
    protected:
      void
      sum_or_product(const Node<M_, W_>* left_, const Node<M_, W_>* right_);
      void
      weight_or_star(const Node<M_, W_>* node);

    public:
      LengthVisitor() :
        s_(0)
      {}

      virtual void
      product(const Node<M_, W_>* left_, const Node<M_, W_>* right_);

      virtual void
      sum(const Node<M_, W_>* left_, const Node<M_, W_>* right_);

      virtual void
      star(const Node<M_, W_>* node);

      virtual void
      left_weight(const W_&, const Node<M_, W_>* node);

      virtual void
      right_weight(const W_&, const Node<M_, W_>* node);

      virtual void
      constant(const M_& m);

      virtual void zero();

      virtual void one();

      size_t get() const;

      size_t set(size_t v)
      {
        this->s_ = v;
        return this->s_;
      }

    protected:
      size_t            s_;
    };

  } // rat

} // vcsn

#include <vaucanson/algebra/implementation/series/rat/length_visitor.hxx>

#endif // ! VCSN_ALGEBRA_IMPLEMENTATION_SERIES_RAT_LENGTH_VISITOR_HH