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# smart_label.hh

    00001 // smart_label.hh: this file is part of the Vaucanson project.
    00002 //
    00003 // Vaucanson, a generic library for finite state machines.
    00004 //
    00005 // Copyright (C) 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
    00018 #ifndef VCSN_AUTOMATA_CONCEPT_SMART_LABEL_HH_
    00019 # define VCSN_AUTOMATA_CONCEPT_SMART_LABEL_HH_
    00020
    00021 # include <boost/multi_index_container.hpp>
    00022 # include <boost/multi_index/member.hpp>
    00023 # include <boost/multi_index/mem_fun.hpp>
    00024 # include <boost/multi_index/hashed_index.hpp>
    00025 # include <boost/shared_ptr.hpp>
    00026
    00027 # include <vaucanson/automata/concept/handlers.hh>
    00028 # include <vaucanson/misc/hash.hh>
    00029
    00030 namespace vcsn
    00031 {
    00032   struct label_h
    00033   {};
    00034
    00035   template <typename T> // T = Graph::label_t
    00036   class SmartLabel
    00037   {
    00038     public:
    00039       typedef T value_type;
    00040
    00041       explicit SmartLabel(const ::boost::shared_ptr<T>& l);
    00042
    00043       const T& value () const;
    00044
    00045       // Handle the reference count
    00046       int ref () const;
    00047       int ref_dec ();
    00048       int ref_inc ();
    00049
    00050       operator const T& ();
    00051
    00052    private:
    00053       ::boost::shared_ptr<T> value_;
    00054       int ref_;
    00055   };
    00056
    00057   template <typename T> // T = Graph::label_t
    00058   class SmartLabelContainer
    00059   {
    00060     public:
    00061       typedef T value_type;
    00062
    00063     private:
    00064       struct label {};
    00065       typedef ::boost::multi_index_container<
    00066           SmartLabel<T>,
    00067           ::boost::multi_index::indexed_by<
    00068             ::boost::multi_index::hashed_unique<
    00069               ::boost::multi_index::tag<label>,
    00070               BOOST_MULTI_INDEX_CONST_MEM_FUN (SmartLabel<T>, const T&, value),
    00071               misc::hash_label<T>
    00072             >
    00073           >
    00074         > label_container_t;
    00075
    00076       label_container_t data_;
    00077
    00078     public:
    00079       typedef handler<label_h, const SmartLabel<T>*> hlabel_t;
    00080
    00081       hlabel_t insert (const T&);
    00082       void erase (const hlabel_t&);
    00083       hlabel_t update (const hlabel_t&, const T&);
    00084
    00085       const T& get_label (const hlabel_t&) const;
    00086       hlabel_t get_hlabel (const T&) const;
    00087   };
    00088
    00089 } // End of namespace vcsn
    00090
    00091 # if !defined VCSN_USE_INTERFACE_ONLY || defined VCSN_USE_LIB
    00092 #  include <vaucanson/automata/concept/smart_label.hxx>
    00093 # endif // !VCSN_USE_INTERFACE_ONLY || VCSN_USE_LIB
    00094
    00095 #endif // !VCSN_AUTOMATA_CONCEPT_SMART_LABEL_HH_ //