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# dispatch_visitor.hh

    00001 // dispatch_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, 2006 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_DISPATCH_VISITOR_HH
    00018 # define VCSN_ALGEBRA_IMPLEMENTATION_SERIES_RAT_DISPATCH_VISITOR_HH
    00019
    00020 # include <vaucanson/algebra/implementation/series/rat/exp.hh>
    00021 # include <vaucanson/misc/deferrer.hh>
    00022
    00023 namespace vcsn
    00024 {
    00025
    00026   namespace algebra
    00027   {
    00028
    00029     template <class Matcher, class Monoid, class Semiring>
    00030     class DispatchVisitor :
    00031       public rat::DefaultMutableNodeVisitor<Monoid, Semiring>
    00032     {
    00033     public:
    00034       typedef Matcher                                   matcher_t;
    00035       typedef typename Matcher::return_type             return_type;
    00036       typedef Monoid                                    monoid_elt_value_t;
    00037       typedef Semiring                                  semiring_elt_value_t;
    00038       typedef rat::Node<monoid_elt_value_t, semiring_elt_value_t>       node_t;
    00039
    00040       DispatchVisitor(Matcher& m);
    00041
    00042       virtual
    00043       ~DispatchVisitor();
    00044
    00045       virtual void
    00046       product(const node_t* lhs, const node_t* rhs);
    00047
    00048       virtual void
    00049       sum(const node_t* lhs, const node_t* rhs);
    00050
    00051       virtual void
    00052       star(const node_t* node);
    00053
    00054       virtual void
    00055       left_weight(const semiring_elt_value_t& w, const node_t* node);
    00056
    00057       virtual void
    00058       right_weight(const semiring_elt_value_t& w, const node_t* node);
    00059
    00060       virtual void
    00061       constant(const monoid_elt_value_t& m);
    00062
    00063       virtual void
    00064       zero();
    00065
    00066       virtual void
    00067       one();
    00068
    00069       return_type get_ret();
    00070
    00071     private:
    00072       matcher_t&                        matcher_;
    00073       misc::Deferrer<return_type>       ret_;
    00074     };
    00075
    00076     template <class T>
    00077     struct DispatchFunction;
    00078
    00085     template <class M, class W>
    00086     struct DispatchFunction< rat::exp<M, W> >
    00087     {
    00088       template <class Matcher>
    00089       static
    00090       typename Matcher::return_type
    00091       d(Matcher& matcher, const rat::exp<M, W>& exp);
    00092     };
    00093
    00094   } // End of namespace algebra.
    00095
    00096 } // End of namespace vcsn.
    00097
    00098 # if !defined VCSN_USE_INTERFACE_ONLY || defined VCSN_USE_LIB
    00099 #  include <vaucanson/algebra/implementation/series/rat/dispatch_visitor.hxx>
    00100 # endif // ! VCSN_USE_INTERFACE_ONLY
    00101
    00102 #endif // ! VCSN_ALGEBRA_IMPLEMENTATION_SERIES_RAT_DISPATCH_VISITOR_HH