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# reverse_visitor.hh

    00001 // reverse_visitor.hh: this file is part of the Vaucanson project.
    00002 //
    00003 // Vaucanson, a generic library for finite state machines.
    00004 //
    00005 // Copyright (C) 2004, 2005 The Vaucanson Group.
    00006 //
    00007 // This program is free software; you can redistribute it and/or
    00008 // modify it under the terms of the GNU General Public License
    00009 // as published by the Free Software Foundation; either version 2
    00010 // of the License, or (at your option) any later version.
    00011 //
    00012 // The complete GNU General Public Licence Notice can be found as the
    00013 // `COPYING' file in the root directory.
    00014 //
    00015 // The Vaucanson Group consists of people listed in the `AUTHORS' file.
    00016 //
    00017 #ifndef VCSN_ALGEBRA_IMPLEMENTATION_SERIES_RAT_REVERSE_VISITOR_HH
    00018 # define VCSN_ALGEBRA_IMPLEMENTATION_SERIES_RAT_REVERSE_VISITOR_HH
    00019
    00020 # include <vaucanson/algebra/concept/series_base.hh>
    00021 # include <vaucanson/algebra/concept/semiring_base.hh>
    00022 # include <vaucanson/algebra/implementation/series/rat/exp.hh>
    00023
    00024 namespace vcsn
    00025 {
    00026
    00027   namespace rat
    00028   {
    00029
    00030     template <class Semiring, class Word, class Weight>
    00031     class ReverseVisitor :
    00032       public rat::DefaultMutableNodeVisitor<Word, Weight>
    00033     {
    00034     public:
    00035       ReverseVisitor(const algebra::SemiringBase<Semiring>& s);
    00036
    00037       virtual
    00038       void
    00039       product(rat::Node<Word, Weight>* lhs,
    00040               rat::Node<Word, Weight>* rhs);
    00041
    00042       virtual
    00043       void
    00044       constant(Word& w);
    00045
    00046       virtual
    00047       void
    00048       left_weight(Weight& w);
    00049
    00050       virtual
    00051       void
    00052       right_weight(Weight& w);
    00053
    00054     protected:
    00055       template <class S>
    00056       static
    00057       Weight
    00058       transpose(const algebra::SeriesBase<S>&, const Weight&);
    00059
    00060       template <class S>
    00061       static
    00062       Weight
    00063       transpose(const algebra::SemiringBase<S>&, const Weight&);
    00064
    00065       const Semiring& s_;
    00066     };
    00067
    00068   } // End of namespace rat.
    00069
    00070   namespace algebra
    00071   {
    00072
    00073     template <typename S, typename T>
    00074     struct DefaultTransposeFun;
    00075
    00076     template <typename S, typename Word, typename Weight>
    00077     struct DefaultTransposeFun< S, rat::exp<Word, Weight> >
    00078     {
    00079       rat::exp<Word, Weight>&
    00080       operator () (const S&, const rat::exp<Word, Weight>& exp);
    00081     };
    00082
    00083   } // End of namespace algebra.
    00084
    00085 } // End of namespace vcsn.
    00086
    00087 # if !defined VCSN_USE_INTERFACE_ONLY || defined VCSN_USE_LIB
    00088 #  include <vaucanson/algebra/implementation/series/rat/reverse_visitor.hxx>
    00089 # endif // ! VCSN_USE_INTERFACE_ONLY
    00090
    00091 #endif // ! VCSN_ALGEBRA_IMPLEMENTATION_SERIES_RAT_REVERSE_VISITOR_HH