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# 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, 2005, 2007 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   namespace algebra {
    00028
    00029     /*----------------------.
    00030     | Generalized converter |
    00031     `----------------------*/
    00032     template<typename W, typename M, typename Tm, typename Tw>
    00033     rat::exp<Tm, Tw> op_convert(const algebra::Series<W, M>& s1,
    00034                                 SELECTOR2(rat::exp<Tm, Tw>),
    00035                                 const algebra::Series<W, M>& s2,
    00036                                 const algebra::polynom<Tm, Tw>& p_value)
    00037     {
    00038       precondition(& s1 == & s2);
    00039
    00040       typedef rat::exp<Tm, Tw> kexp_t;
    00041       kexp_t    exp;
    00042
    00043       if (p_value == identity_value(SELECT2(algebra::Series<W, M>),
    00044                                     SELECT2(algebra::polynom<Tm, Tw>)))
    00045         return kexp_t::one();
    00046
    00047       if (p_value == zero_value(SELECT2(algebra::Series<W, M>),
    00048                                 SELECT2(algebra::polynom<Tm, Tw>)))
    00049         return kexp_t::zero();
    00050
    00051       for (typename algebra::polynom<Tm, Tw>::const_iterator p = p_value.begin();
    00052            p != p_value.end();
    00053            ++p)
    00054         if (exp == kexp_t::zero())
    00055           exp = (*p).second *  kexp_t::constant((*p).first);
    00056         else
    00057           exp += (*p).second *  kexp_t::constant((*p).first);
    00058       return exp;
    00059     }
    00060
    00061   } // algebra
    00062
    00063 } // vcsn
    00064
    00065 #endif // ! VCSN_ALGEBRA_IMPLEMENTATION_SERIES_GENERALIZED_HXX