[946] | 1 | /* -*- C++ -*- |
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| 2 | * |
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[1956] | 3 | * This file is a part of LEMON, a generic C++ optimization library |
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| 4 | * |
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| 5 | * Copyright (C) 2003-2006 |
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| 6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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| 7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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[946] | 8 | * |
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| 9 | * Permission to use, modify and distribute this software is granted |
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| 10 | * provided that this copyright notice appears in all copies. For |
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| 11 | * precise terms see the accompanying LICENSE file. |
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| 12 | * |
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| 13 | * This software is provided "AS IS" with no warranty of any kind, |
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| 14 | * express or implied, and with no claim as to its suitability for any |
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| 15 | * purpose. |
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| 16 | * |
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| 17 | */ |
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| 18 | |
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| 19 | #ifndef LEMON_ALTERATION_OBSERVER_REGISTRY_H |
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| 20 | #define LEMON_ALTERATION_OBSERVER_REGISTRY_H |
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| 21 | |
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| 22 | #include <vector> |
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| 23 | #include <algorithm> |
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| 24 | |
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[1946] | 25 | ///\ingroup graphmapfactory |
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[946] | 26 | ///\file |
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| 27 | ///\brief Observer registry for graph alteration observers. |
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| 28 | |
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| 29 | namespace lemon { |
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| 30 | |
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[1910] | 31 | /// \addtogroin graphmapfactory |
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[946] | 32 | /// @{ |
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| 33 | |
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[1414] | 34 | /// \brief Registry class to register objects observes alterations in |
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| 35 | /// the graph. |
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| 36 | /// |
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[946] | 37 | /// This class is a registry for the objects which observe the |
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| 38 | /// alterations in a container. The alteration observers can be attached |
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| 39 | /// to and detached from the registry. The observers have to inherit |
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[1038] | 40 | /// from the \ref AlterationNotifier::ObserverBase and override |
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[946] | 41 | /// the virtual functions in that. |
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| 42 | /// |
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| 43 | /// The most important application of the alteration observing is the |
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[1414] | 44 | /// dynamic map implementation. |
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[946] | 45 | /// |
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| 46 | /// \param _Item The item type what the observers are observing, usually |
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| 47 | /// edge or node. |
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| 48 | /// |
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| 49 | /// \author Balazs Dezso |
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| 50 | |
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| 51 | template <typename _Item> |
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[1038] | 52 | class AlterationNotifier { |
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[946] | 53 | public: |
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| 54 | typedef _Item Item; |
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| 55 | |
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| 56 | /// ObserverBase is the base class for the observers. |
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| 57 | |
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| 58 | /// ObserverBase is the abstract base class for the observers. |
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| 59 | /// It will be notified about an item was inserted into or |
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| 60 | /// erased from the graph. |
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| 61 | /// |
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| 62 | /// The observer interface contains some pure virtual functions |
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| 63 | /// to override. The add() and erase() functions are |
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| 64 | /// to notify the oberver when one item is added or |
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| 65 | /// erased. |
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| 66 | /// |
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| 67 | /// The build() and clear() members are to notify the observer |
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[1204] | 68 | /// about the container is built from an empty container or |
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[946] | 69 | /// is cleared to an empty container. |
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| 70 | /// |
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| 71 | /// \author Balazs Dezso |
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| 72 | |
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| 73 | class ObserverBase { |
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| 74 | protected: |
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[1038] | 75 | typedef AlterationNotifier Registry; |
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[946] | 76 | |
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[1038] | 77 | friend class AlterationNotifier; |
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[946] | 78 | |
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[1414] | 79 | /// \brief Default constructor. |
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| 80 | /// |
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[946] | 81 | /// Default constructor for ObserverBase. |
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| 82 | /// |
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| 83 | ObserverBase() : registry(0) {} |
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| 84 | |
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[1685] | 85 | ObserverBase(const ObserverBase& copy) { |
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| 86 | if (copy.attached()) { |
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| 87 | copy.getRegistry()->attach(*this); |
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| 88 | } |
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| 89 | } |
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| 90 | |
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[946] | 91 | virtual ~ObserverBase() {} |
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| 92 | |
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[1414] | 93 | /// \brief Attaches the observer into an AlterationNotifier. |
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| 94 | /// |
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[1038] | 95 | /// This member attaches the observer into an AlterationNotifier. |
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[946] | 96 | /// |
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[1038] | 97 | void attach(AlterationNotifier& r) { |
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[946] | 98 | registry = &r; |
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| 99 | registry->attach(*this); |
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| 100 | } |
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| 101 | |
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[1414] | 102 | /// \brief Detaches the observer into an AlterationNotifier. |
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| 103 | /// |
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[1038] | 104 | /// This member detaches the observer from an AlterationNotifier. |
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[946] | 105 | /// |
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| 106 | void detach() { |
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| 107 | if (registry) { |
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| 108 | registry->detach(*this); |
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| 109 | } |
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| 110 | } |
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| 111 | |
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| 112 | |
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| 113 | /// Gives back a pointer to the registry what the map attached into. |
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| 114 | |
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| 115 | /// This function gives back a pointer to the registry what the map |
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| 116 | /// attached into. |
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| 117 | /// |
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| 118 | Registry* getRegistry() const { return const_cast<Registry*>(registry); } |
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| 119 | |
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| 120 | /// Gives back true when the observer is attached into a registry. |
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| 121 | bool attached() const { return registry != 0; } |
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[1685] | 122 | |
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[946] | 123 | private: |
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| 124 | |
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| 125 | ObserverBase& operator=(const ObserverBase& copy); |
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| 126 | |
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| 127 | protected: |
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| 128 | |
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| 129 | Registry* registry; |
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| 130 | int registry_index; |
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| 131 | |
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| 132 | /// \brief The member function to notificate the observer about an |
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| 133 | /// item is added to the container. |
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| 134 | /// |
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| 135 | /// The add() member function notificates the observer about an item |
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| 136 | /// is added to the container. It have to be overrided in the |
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| 137 | /// subclasses. |
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| 138 | |
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[1414] | 139 | virtual void add(const Item&) = 0; |
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[946] | 140 | |
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[1414] | 141 | /// \brief The member function to notificate the observer about |
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[1718] | 142 | /// more item is added to the container. |
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[1414] | 143 | /// |
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[1718] | 144 | /// The add() member function notificates the observer about more item |
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[1414] | 145 | /// is added to the container. It have to be overrided in the |
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| 146 | /// subclasses. |
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| 147 | |
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| 148 | virtual void add(const std::vector<Item>& items) { |
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| 149 | for (int i = 0; i < (int)items.size(); ++i) { |
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| 150 | add(items[i]); |
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| 151 | } |
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| 152 | } |
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[946] | 153 | |
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| 154 | /// \brief The member function to notificate the observer about an |
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| 155 | /// item is erased from the container. |
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| 156 | /// |
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| 157 | /// The erase() member function notificates the observer about an |
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| 158 | /// item is erased from the container. It have to be overrided in |
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| 159 | /// the subclasses. |
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| 160 | |
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| 161 | virtual void erase(const Item&) = 0; |
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| 162 | |
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[1718] | 163 | /// \brief The member function to notificate the observer about |
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| 164 | /// more item is erased from the container. |
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| 165 | /// |
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| 166 | /// The erase() member function notificates the observer about more item |
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| 167 | /// is erased from the container. It have to be overrided in the |
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| 168 | /// subclasses. |
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[1414] | 169 | virtual void erase(const std::vector<Item>& items) { |
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| 170 | for (int i = 0; i < (int)items.size(); ++i) { |
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[1701] | 171 | erase(items[i]); |
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[1414] | 172 | } |
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| 173 | } |
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| 174 | |
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[946] | 175 | /// \brief The member function to notificate the observer about the |
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[1204] | 176 | /// container is built. |
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[946] | 177 | /// |
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| 178 | /// The build() member function notificates the observer about the |
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[1204] | 179 | /// container is built from an empty container. It have to be |
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[946] | 180 | /// overrided in the subclasses. |
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| 181 | |
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| 182 | virtual void build() = 0; |
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| 183 | |
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| 184 | /// \brief The member function to notificate the observer about all |
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| 185 | /// items are erased from the container. |
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| 186 | /// |
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| 187 | /// The clear() member function notificates the observer about all |
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| 188 | /// items are erased from the container. It have to be overrided in |
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| 189 | /// the subclasses. |
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| 190 | |
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| 191 | virtual void clear() = 0; |
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| 192 | |
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| 193 | }; |
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| 194 | |
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| 195 | protected: |
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| 196 | |
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| 197 | |
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| 198 | typedef std::vector<ObserverBase*> Container; |
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| 199 | |
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| 200 | Container container; |
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| 201 | |
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| 202 | |
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| 203 | public: |
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| 204 | |
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| 205 | /// Default constructor. |
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| 206 | |
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| 207 | /// |
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[1038] | 208 | /// The default constructor of the AlterationNotifier. |
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[946] | 209 | /// It creates an empty registry. |
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[1038] | 210 | AlterationNotifier() {} |
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[946] | 211 | |
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[1038] | 212 | /// Copy Constructor of the AlterationNotifier. |
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[946] | 213 | |
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[1038] | 214 | /// Copy constructor of the AlterationNotifier. |
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[946] | 215 | /// It creates only an empty registry because the copiable |
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| 216 | /// registry's observers have to be registered still into that registry. |
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[1039] | 217 | AlterationNotifier(const AlterationNotifier&) {} |
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[946] | 218 | |
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| 219 | /// Assign operator. |
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| 220 | |
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[1038] | 221 | /// Assign operator for the AlterationNotifier. |
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[1040] | 222 | /// It makes the notifier only empty because the copiable |
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| 223 | /// notifier's observers have to be registered still into that registry. |
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[1039] | 224 | AlterationNotifier& operator=(const AlterationNotifier&) { |
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[946] | 225 | typename Container::iterator it; |
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| 226 | for (it = container.begin(); it != container.end(); ++it) { |
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| 227 | (*it)->registry = 0; |
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| 228 | } |
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| 229 | } |
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| 230 | |
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| 231 | /// Destructor. |
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| 232 | |
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[1038] | 233 | /// Destructor of the AlterationNotifier. |
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[946] | 234 | /// |
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[1038] | 235 | ~AlterationNotifier() { |
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[946] | 236 | typename Container::iterator it; |
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| 237 | for (it = container.begin(); it != container.end(); ++it) { |
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| 238 | (*it)->registry = 0; |
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| 239 | } |
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| 240 | } |
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| 241 | |
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| 242 | |
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| 243 | protected: |
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| 244 | |
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| 245 | void attach(ObserverBase& observer) { |
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| 246 | container.push_back(&observer); |
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| 247 | observer.registry = this; |
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| 248 | observer.registry_index = container.size()-1; |
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| 249 | } |
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| 250 | |
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| 251 | void detach(ObserverBase& base) { |
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| 252 | container.back()->registry_index = base.registry_index; |
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| 253 | container[base.registry_index] = container.back(); |
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| 254 | container.pop_back(); |
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| 255 | base.registry = 0; |
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| 256 | } |
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| 257 | |
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| 258 | public: |
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| 259 | |
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[1414] | 260 | /// \brief Notifies all the registered observers about an Item added to |
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| 261 | /// the container. |
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| 262 | /// |
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| 263 | /// It notifies all the registered observers about an Item added to |
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| 264 | /// the container. |
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[946] | 265 | /// |
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[1414] | 266 | void add(const Item& item) { |
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[946] | 267 | typename Container::iterator it; |
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| 268 | for (it = container.begin(); it != container.end(); ++it) { |
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[1414] | 269 | (*it)->add(item); |
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[946] | 270 | } |
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| 271 | } |
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| 272 | |
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[1414] | 273 | /// \brief Notifies all the registered observers about more Item added to |
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| 274 | /// the container. |
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| 275 | /// |
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| 276 | /// It notifies all the registered observers about more Item added to |
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| 277 | /// the container. |
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| 278 | /// |
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| 279 | void add(const std::vector<Item>& items) { |
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| 280 | typename Container::iterator it; |
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| 281 | for (it = container.begin(); it != container.end(); ++it) { |
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| 282 | (*it)->add(items); |
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| 283 | } |
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| 284 | } |
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| 285 | |
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| 286 | /// \brief Notifies all the registered observers about an Item erased from |
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| 287 | /// the container. |
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| 288 | /// |
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| 289 | /// It notifies all the registered observers about an Item erased from |
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| 290 | /// the container. |
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[946] | 291 | /// |
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| 292 | void erase(const Item& key) { |
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| 293 | typename Container::iterator it; |
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| 294 | for (it = container.begin(); it != container.end(); ++it) { |
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| 295 | (*it)->erase(key); |
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| 296 | } |
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| 297 | } |
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[1414] | 298 | |
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| 299 | /// \brief Notifies all the registered observers about more Item erased |
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| 300 | /// from the container. |
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| 301 | /// |
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| 302 | /// It notifies all the registered observers about more Item erased from |
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| 303 | /// the container. |
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| 304 | /// |
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| 305 | void erase(const std::vector<Item>& items) { |
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| 306 | typename Container::iterator it; |
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| 307 | for (it = container.begin(); it != container.end(); ++it) { |
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| 308 | (*it)->erase(items); |
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| 309 | } |
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| 310 | } |
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[946] | 311 | |
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[1414] | 312 | /// \brief Notifies all the registered observers about the container is |
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| 313 | /// built. |
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| 314 | /// |
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[1204] | 315 | /// Notifies all the registered observers about the container is built |
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[946] | 316 | /// from an empty container. |
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| 317 | void build() { |
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| 318 | typename Container::iterator it; |
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| 319 | for (it = container.begin(); it != container.end(); ++it) { |
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| 320 | (*it)->build(); |
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| 321 | } |
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| 322 | } |
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| 323 | |
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| 324 | |
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[1414] | 325 | /// \brief Notifies all the registered observers about all Items are |
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| 326 | /// erased. |
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| 327 | /// |
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[946] | 328 | /// Notifies all the registered observers about all Items are erased |
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| 329 | /// from the container. |
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| 330 | void clear() { |
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| 331 | typename Container::iterator it; |
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| 332 | for (it = container.begin(); it != container.end(); ++it) { |
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| 333 | (*it)->clear(); |
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| 334 | } |
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| 335 | } |
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| 336 | }; |
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| 337 | |
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| 338 | |
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[962] | 339 | /// \brief Class to extend a graph with the functionality of alteration |
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| 340 | /// observing. |
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| 341 | /// |
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| 342 | /// AlterableGraphExtender extends the _Base graphs functionality with |
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| 343 | /// the possibility of alteration observing. It defines two observer |
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| 344 | /// registrys for the nodes and mapes. |
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| 345 | /// |
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| 346 | /// \todo Document what "alteration observing" is. And probably find a |
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| 347 | /// better (shorter) name. |
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[946] | 348 | /// |
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| 349 | /// \param _Base is the base class to extend. |
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| 350 | /// |
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| 351 | /// \pre _Base is conform to the BaseGraphComponent concept. |
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| 352 | /// |
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[962] | 353 | /// \post AlterableGraphExtender<_Base> is conform to the |
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| 354 | /// AlterableGraphComponent concept. |
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[946] | 355 | /// |
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| 356 | /// \author Balazs Dezso |
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| 357 | |
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| 358 | template <typename _Base> |
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| 359 | class AlterableGraphExtender : public _Base { |
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| 360 | public: |
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| 361 | |
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| 362 | typedef AlterableGraphExtender Graph; |
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| 363 | typedef _Base Parent; |
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| 364 | |
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| 365 | typedef typename Parent::Node Node; |
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| 366 | typedef typename Parent::Edge Edge; |
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| 367 | |
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[962] | 368 | /// The edge observer registry. |
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[1039] | 369 | typedef AlterationNotifier<Edge> EdgeNotifier; |
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[946] | 370 | /// The node observer registry. |
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[1039] | 371 | typedef AlterationNotifier<Node> NodeNotifier; |
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[946] | 372 | |
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| 373 | |
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| 374 | protected: |
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| 375 | |
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[1040] | 376 | mutable EdgeNotifier edge_notifier; |
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[946] | 377 | |
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[1040] | 378 | mutable NodeNotifier node_notifier; |
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[946] | 379 | |
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| 380 | public: |
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| 381 | |
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[1134] | 382 | /// \brief Gives back the edge alteration notifier. |
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| 383 | /// |
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| 384 | /// Gives back the edge alteration notifier. |
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| 385 | EdgeNotifier& getNotifier(Edge) const { |
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[1040] | 386 | return edge_notifier; |
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[946] | 387 | } |
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| 388 | |
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[1134] | 389 | /// \brief Gives back the node alteration notifier. |
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| 390 | /// |
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| 391 | /// Gives back the node alteration notifier. |
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| 392 | NodeNotifier& getNotifier(Node) const { |
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[1040] | 393 | return node_notifier; |
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[946] | 394 | } |
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| 395 | |
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| 396 | ~AlterableGraphExtender() { |
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[1040] | 397 | node_notifier.clear(); |
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| 398 | edge_notifier.clear(); |
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[946] | 399 | } |
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| 400 | |
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| 401 | }; |
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| 402 | |
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[1842] | 403 | |
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| 404 | template <typename _Base> |
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| 405 | class AlterableEdgeSetExtender : public _Base { |
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| 406 | public: |
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| 407 | |
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| 408 | typedef AlterableEdgeSetExtender Graph; |
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| 409 | typedef _Base Parent; |
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| 410 | |
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| 411 | typedef typename Parent::Edge Edge; |
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| 412 | |
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| 413 | /// The edge observer registry. |
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| 414 | typedef AlterationNotifier<Edge> EdgeNotifier; |
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| 415 | |
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| 416 | protected: |
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| 417 | |
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| 418 | mutable EdgeNotifier edge_notifier; |
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| 419 | |
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| 420 | public: |
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| 421 | |
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| 422 | /// \brief Gives back the edge alteration notifier. |
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| 423 | /// |
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| 424 | /// Gives back the edge alteration notifier. |
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| 425 | EdgeNotifier& getNotifier(Edge) const { |
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| 426 | return edge_notifier; |
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| 427 | } |
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| 428 | |
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| 429 | ~AlterableEdgeSetExtender() { |
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| 430 | edge_notifier.clear(); |
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| 431 | } |
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| 432 | |
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| 433 | }; |
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| 434 | |
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[962] | 435 | /// \brief Class to extend an undirected graph with the functionality of |
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| 436 | /// alteration observing. |
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| 437 | /// |
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| 438 | /// \todo Document. |
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| 439 | /// |
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| 440 | /// \sa AlterableGraphExtender |
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| 441 | /// |
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| 442 | /// \bug This should be done some other way. Possibilities: template |
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| 443 | /// specialization (not very easy, if at all possible); some kind of |
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| 444 | /// enable_if boost technique? |
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| 445 | |
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| 446 | template <typename _Base> |
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[1909] | 447 | class AlterableUGraphExtender |
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[962] | 448 | : public AlterableGraphExtender<_Base> { |
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| 449 | public: |
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| 450 | |
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[1909] | 451 | typedef AlterableUGraphExtender Graph; |
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[962] | 452 | typedef AlterableGraphExtender<_Base> Parent; |
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| 453 | |
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[1909] | 454 | typedef typename Parent::UEdge UEdge; |
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[962] | 455 | |
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| 456 | /// The edge observer registry. |
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[1909] | 457 | typedef AlterationNotifier<UEdge> UEdgeNotifier; |
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[962] | 458 | |
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| 459 | protected: |
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| 460 | |
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[1909] | 461 | mutable UEdgeNotifier u_edge_notifier; |
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[962] | 462 | |
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[1022] | 463 | public: |
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| 464 | |
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[1038] | 465 | using Parent::getNotifier; |
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[1909] | 466 | UEdgeNotifier& getNotifier(UEdge) const { |
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| 467 | return u_edge_notifier; |
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[962] | 468 | } |
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| 469 | |
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[1909] | 470 | ~AlterableUGraphExtender() { |
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| 471 | u_edge_notifier.clear(); |
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[962] | 472 | } |
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| 473 | }; |
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[1820] | 474 | |
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[1842] | 475 | template <typename _Base> |
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[1909] | 476 | class AlterableUEdgeSetExtender |
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[1842] | 477 | : public AlterableEdgeSetExtender<_Base> { |
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| 478 | public: |
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| 479 | |
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[1909] | 480 | typedef AlterableUEdgeSetExtender Graph; |
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[1842] | 481 | typedef AlterableEdgeSetExtender<_Base> Parent; |
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| 482 | |
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[1909] | 483 | typedef typename Parent::UEdge UEdge; |
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[1842] | 484 | |
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[1909] | 485 | typedef AlterationNotifier<UEdge> UEdgeNotifier; |
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[1842] | 486 | |
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| 487 | protected: |
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| 488 | |
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[1909] | 489 | mutable UEdgeNotifier u_edge_notifier; |
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[1842] | 490 | |
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| 491 | public: |
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| 492 | |
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| 493 | using Parent::getNotifier; |
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[1909] | 494 | UEdgeNotifier& getNotifier(UEdge) const { |
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| 495 | return u_edge_notifier; |
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[1842] | 496 | } |
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| 497 | |
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[1909] | 498 | ~AlterableUEdgeSetExtender() { |
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| 499 | u_edge_notifier.clear(); |
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[1842] | 500 | } |
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| 501 | }; |
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| 502 | |
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| 503 | |
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[1820] | 504 | |
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| 505 | template <typename _Base> |
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[1910] | 506 | class AlterableBpUGraphExtender : public _Base { |
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[1820] | 507 | public: |
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| 508 | |
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| 509 | typedef _Base Parent; |
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[1910] | 510 | typedef AlterableBpUGraphExtender Graph; |
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[1820] | 511 | |
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| 512 | typedef typename Parent::Node Node; |
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[1910] | 513 | typedef typename Parent::BNode BNode; |
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| 514 | typedef typename Parent::ANode ANode; |
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[1820] | 515 | typedef typename Parent::Edge Edge; |
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[1909] | 516 | typedef typename Parent::UEdge UEdge; |
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[1820] | 517 | |
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| 518 | |
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| 519 | typedef AlterationNotifier<Node> NodeNotifier; |
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[1910] | 520 | typedef AlterationNotifier<BNode> BNodeNotifier; |
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| 521 | typedef AlterationNotifier<ANode> ANodeNotifier; |
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[1820] | 522 | typedef AlterationNotifier<Edge> EdgeNotifier; |
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[1909] | 523 | typedef AlterationNotifier<UEdge> UEdgeNotifier; |
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[1820] | 524 | |
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| 525 | protected: |
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| 526 | |
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| 527 | mutable NodeNotifier nodeNotifier; |
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[1910] | 528 | mutable BNodeNotifier bNodeNotifier; |
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| 529 | mutable ANodeNotifier aNodeNotifier; |
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[1820] | 530 | mutable EdgeNotifier edgeNotifier; |
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[1909] | 531 | mutable UEdgeNotifier uEdgeNotifier; |
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[1820] | 532 | |
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| 533 | public: |
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| 534 | |
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| 535 | NodeNotifier& getNotifier(Node) const { |
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| 536 | return nodeNotifier; |
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| 537 | } |
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| 538 | |
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[1910] | 539 | BNodeNotifier& getNotifier(BNode) const { |
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| 540 | return bNodeNotifier; |
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[1820] | 541 | } |
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| 542 | |
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[1910] | 543 | ANodeNotifier& getNotifier(ANode) const { |
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| 544 | return aNodeNotifier; |
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[1820] | 545 | } |
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| 546 | |
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| 547 | EdgeNotifier& getNotifier(Edge) const { |
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| 548 | return edgeNotifier; |
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| 549 | } |
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| 550 | |
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[1909] | 551 | UEdgeNotifier& getNotifier(UEdge) const { |
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| 552 | return uEdgeNotifier; |
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[1820] | 553 | } |
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| 554 | |
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[1910] | 555 | ~AlterableBpUGraphExtender() { |
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[1820] | 556 | nodeNotifier.clear(); |
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[1910] | 557 | bNodeNotifier.clear(); |
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| 558 | aNodeNotifier.clear(); |
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[1820] | 559 | edgeNotifier.clear(); |
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[1909] | 560 | uEdgeNotifier.clear(); |
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[1820] | 561 | } |
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| 562 | |
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| 563 | }; |
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[946] | 564 | |
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| 565 | /// @} |
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| 566 | |
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| 567 | |
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| 568 | } |
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| 569 | |
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| 570 | #endif |
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