generalized.hxx

00001 // generalized.hxx: this file is part of the Vaucanson project.
00002 //
00003 // Vaucanson, a generic library for finite state machines.
00004 //
00005 // Copyright (C) 2001, 2002, 2003, 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_GENERALIZED_HXX
00018 # define VCSN_ALGEBRA_IMPLEMENTATION_SERIES_GENERALIZED_HXX
00019 
00020 # include <vaucanson/misc/selectors.hh>
00021 # include <vaucanson/algebra/concept/series_base.hh>
00022 # include <vaucanson/algebra/implementation/series/polynoms.hh>
00023 # include <vaucanson/algebra/implementation/series/krat.hh>
00024 
00025 namespace vcsn {
00026 
00027     /*----------------------.
00028     | Generalized converter |
00029     `----------------------*/
00030     template<typename W, typename M, typename Tm, typename Tw>
00031     rat::exp<Tm, Tw> op_convert(const algebra::Series<W, M>& s1,
00032                                 SELECTOR2(rat::exp<Tm, Tw>),
00033                                 const algebra::Series<W, M>& s2,
00034                                 const algebra::polynom<Tm, Tw>& p_value)
00035     {
00036       precondition(& s1 == & s2);
00037 
00038       typedef rat::exp<Tm, Tw> kexp_t;
00039       kexp_t    exp;
00040 
00041       if (p_value == identity_value(SELECT2(algebra::Series<W, M>),
00042                                     SELECT2(algebra::polynom<Tm, Tw>)))
00043         return kexp_t::one();
00044 
00045       if (p_value == zero_value(SELECT2(algebra::Series<W, M>),
00046                                 SELECT2(algebra::polynom<Tm, Tw>)))
00047         return kexp_t::zero();
00048 
00049       for (typename algebra::polynom<Tm, Tw>::const_iterator p = p_value.begin();
00050            p != p_value.end();
00051            ++p)
00052         if (exp == kexp_t::zero())
00053           exp = (*p).second *  kexp_t::constant((*p).first);
00054         else
00055           exp += (*p).second *  kexp_t::constant((*p).first);
00056       return exp;
00057     }
00058 
00059 } // vcsn
00060 
00061 #endif // ! VCSN_ALGEBRA_IMPLEMENTATION_SERIES_GENERALIZED_HXX

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