exp.hh

// exp.hh: this file is part of the Vaucanson project.
//
// Vaucanson, a generic library for finite state machines.
//
// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 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_EXP_HH
# define VCSN_ALGEBRA_IMPLEMENTATION_SERIES_RAT_EXP_HH

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

namespace vcsn {

  namespace rat {

    template<typename LetterT, typename WeightT>
    class exp
    {
    public:
      typedef rat::Node<LetterT, WeightT>                       node_t;
      typedef typename rat::Node<LetterT, WeightT>::type        type;
      typedef rat::Zero<LetterT, WeightT>                       n_zero_t;
      typedef rat::One<LetterT, WeightT>                        n_one_t;
      typedef rat::Sum<LetterT, WeightT>                        n_sum_t;
      typedef rat::Product<LetterT, WeightT>                    n_prod_t;
      typedef rat::Star<LetterT, WeightT>                       n_star_t;
      typedef rat::Constant<LetterT, WeightT>                   n_const_t;

    public:
      typedef LetterT monoid_elt_value_t;
      typedef WeightT semiring_elt_value_t;


      exp();
      exp(node_t* p);
      exp(const node_t* p);
      exp(const exp& other);

      ~exp();


      exp& operator = (const exp& other);
      exp& operator += (const exp& other);
      exp& operator *= (const exp& other);

      exp& star();

      exp& swap(exp& otether);

      void
      accept(ConstNodeVisitor<monoid_elt_value_t, semiring_elt_value_t>& v)
        const;

      size_t depth() const;

      size_t star_height() const;

      size_t length() const;


      node_t*           &base();
      node_t* const     &base() const;


      bool operator == (const exp& other) const;
      bool operator != (const exp& other) const;
      bool operator < (const exp& other) const;

      exp clone() const;


      static exp one();
      static exp zero();
      static exp constant(const monoid_elt_value_t& l);

      static bool starable();

    protected:
      node_t *base_;
    };

    template<typename M, typename W>
    const exp<M, W> operator*(const exp<M, W>& lhs,
                              const exp<M, W>& rhs);

    template<typename M, typename W>
    exp<M, W> operator+(const exp<M, W>& lhs,
                        const exp<M, W>& rhs);

    template<typename M, typename W>
    exp<M, W> operator*(const W& lhs,
                        const exp<M, W>& rhs);

    template<typename M, typename W>
    exp<M, W> operator*(const exp<M, W>& lhs,
                        const W& rhs);

    // FIXME: This is an *evil* hack, but without it there is an ambiguity
    // FIXME: in calls to exp * number or number * exp.

    template<typename M, typename S, typename T>
    exp<M, Element<S, T> >
    operator*(const Element<S, T>& lhs,
              const exp<M, Element<S, T> >& rhs);

    template<typename M, typename S, typename T>
    exp<M, Element<S, T> >
    operator*(const exp<M, Element<S, T> >& lhs,
              const Element<S, T>& rhs);

    template<typename M, typename W>
    void swap(vcsn::rat::exp<M, W>& lhs,
              vcsn::rat::exp<M, W>& rhs);

  } // End of namespace rat.

} // End of namespace vcsn.

# if !defined VCSN_USE_INTERFACE_ONLY || defined VCSN_USE_LIB
#  include <vaucanson/algebra/implementation/series/rat/exp.hxx>
# endif // VCSN_USE_INTERFACE_ONLY

#endif // ! VCSN_ALGEBRA_IMPLEMENTATION_SERIES_RAT_EXP_HH

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