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 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 # ifndef VCSN_USE_INTERFACE_ONLY
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

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