1 | /*! |
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2 | @file Iterator.h |
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3 | @brief Definition of the Iterator class. |
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4 | |
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5 | The Iterator of a given class allows to iterate through an ObjectList, containing all objects of that type. |
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6 | This is the only way to access the objects in an ObjectList. |
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7 | |
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8 | Usage: |
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9 | for (Iterator<class> it = ObjectList<class>::start(); it != 0; ++it) |
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10 | { |
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11 | it->someFunction(...); |
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12 | class* myObject = *it; |
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13 | } |
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14 | |
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15 | Warning: Don't delete an object directly through the iterator. |
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16 | */ |
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17 | |
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18 | #ifndef _Iterator_H__ |
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19 | #define _Iterator_H__ |
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20 | |
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21 | namespace orxonox |
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22 | { |
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23 | //! The iterator allows to iterate through an ObjectList of a given class. |
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24 | template <class T> |
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25 | class Iterator |
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26 | { |
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27 | public: |
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28 | /** |
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29 | @brief Constructor: Sets the element whereon the iterator points to zero. |
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30 | */ |
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31 | Iterator() |
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32 | { |
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33 | this->element_ = 0; |
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34 | } |
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35 | |
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36 | /** |
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37 | @brief Constructor: Sets the element whereon the iterator points to a given element. |
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38 | @param element The element to start with |
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39 | */ |
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40 | Iterator(ObjectListElement<T>* element) |
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41 | { |
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42 | this->element_ = element; |
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43 | } |
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44 | |
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45 | /** |
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46 | @brief Overloading of the ++it operator: Iterator iterates to the next object in the list. |
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47 | @return The Iterator itself |
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48 | */ |
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49 | Iterator<T> operator++() |
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50 | { |
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51 | this->element_ = this->element_->next_; |
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52 | return *this; |
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53 | } |
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54 | |
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55 | /** |
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56 | @brief Overloading of the --it operator: Iterator iterates to the previous object in the list. |
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57 | @return The Iterator itself |
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58 | */ |
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59 | Iterator<T> operator--() |
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60 | { |
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61 | this->element_ = this->element_->prev_; |
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62 | return *this; |
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63 | } |
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64 | |
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65 | /** |
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66 | @brief Overloading of the *it operator: returns the pointer to the object. |
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67 | @return The object the Iterator points at |
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68 | */ |
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69 | T* operator*() |
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70 | { |
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71 | return this->element_->object_; |
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72 | } |
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73 | |
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74 | /** |
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75 | @brief Overloading of the it-> operator: returns the pointer to the object. |
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76 | @return The object the Iterator points at |
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77 | */ |
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78 | T* operator->() const |
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79 | { |
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80 | return this->element_->object_; |
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81 | |
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82 | } |
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83 | |
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84 | /** |
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85 | @brief Overloading of the typecast-operator to bool: returns true if the iterator points to an existing object. |
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86 | @return True if the iterator points to an existing object. |
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87 | */ |
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88 | operator bool() |
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89 | { |
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90 | return (this->element_ != 0); |
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91 | } |
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92 | |
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93 | /** |
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94 | @brief Overloading of the (it != int) operator: Used for (it != 0) instead of typecast-operator to bool. |
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95 | @param compare The integer (must be zero, everything else makes no sense). |
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96 | @return True if the iterator points to an existing object. |
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97 | */ |
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98 | bool operator!=(int compare) |
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99 | { |
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100 | // Comparing with something except zero makes no sense |
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101 | if (compare != 0) |
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102 | std::cout << "Warning: Comparing the " << ClassIdentifier<T>::getIdentifier()->getName() << "-List-Iterator with " << compare << " has no effect. Only comparison with 0 works.\n"; |
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103 | |
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104 | return (this->element_ != 0); |
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105 | } |
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106 | |
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107 | private: |
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108 | ObjectListElement<T>* element_; //!< The element the Iterator points to |
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109 | }; |
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110 | } |
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111 | |
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112 | #endif |
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