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39 | |
40 | #ifndef QLAZILYALLOCATED_P_H |
41 | #define QLAZILYALLOCATED_P_H |
42 | |
43 | // |
44 | // W A R N I N G |
45 | // ------------- |
46 | // |
47 | // This file is not part of the Qt API. It exists purely as an |
48 | // implementation detail. This header file may change from version to |
49 | // version without notice, or even be removed. |
50 | // |
51 | // We mean it. |
52 | // |
53 | |
54 | #include <QtCore/qglobal.h> |
55 | |
56 | #include <private/qflagpointer_p.h> |
57 | |
58 | QT_BEGIN_NAMESPACE |
59 | |
60 | template<typename T> |
61 | class QLazilyAllocated { |
62 | public: |
63 | inline QLazilyAllocated(); |
64 | inline ~QLazilyAllocated(); |
65 | |
66 | inline bool isAllocated() const; |
67 | |
68 | inline T *operator->() const; |
69 | |
70 | inline T &value(); |
71 | inline const T &value() const; |
72 | |
73 | inline bool flag() const; |
74 | inline void setFlag(); |
75 | inline void clearFlag(); |
76 | inline void setFlagValue(bool); |
77 | private: |
78 | mutable QFlagPointer<T> d; |
79 | }; |
80 | |
81 | template<typename T> |
82 | QLazilyAllocated<T>::QLazilyAllocated() |
83 | { |
84 | } |
85 | |
86 | template<typename T> |
87 | QLazilyAllocated<T>::~QLazilyAllocated() |
88 | { |
89 | delete *d; |
90 | } |
91 | |
92 | template<typename T> |
93 | bool QLazilyAllocated<T>::isAllocated() const |
94 | { |
95 | return !d.isNull(); |
96 | } |
97 | |
98 | template<typename T> |
99 | T &QLazilyAllocated<T>::value() |
100 | { |
101 | if (d.isNull()) d = new T; |
102 | return *(*d); |
103 | } |
104 | |
105 | template<typename T> |
106 | const T &QLazilyAllocated<T>::value() const |
107 | { |
108 | if (d.isNull()) d = new T; |
109 | return *(*d); |
110 | } |
111 | |
112 | template<typename T> |
113 | T *QLazilyAllocated<T>::operator->() const |
114 | { |
115 | return *d; |
116 | } |
117 | |
118 | template<typename T> |
119 | bool QLazilyAllocated<T>::flag() const |
120 | { |
121 | return d.flag(); |
122 | } |
123 | |
124 | template<typename T> |
125 | void QLazilyAllocated<T>::setFlag() |
126 | { |
127 | d.setFlag(); |
128 | } |
129 | |
130 | template<typename T> |
131 | void QLazilyAllocated<T>::clearFlag() |
132 | { |
133 | d.clearFlag(); |
134 | } |
135 | |
136 | template<typename T> |
137 | void QLazilyAllocated<T>::setFlagValue(bool v) |
138 | { |
139 | d.setFlagValue(v); |
140 | } |
141 | |
142 | QT_END_NAMESPACE |
143 | |
144 | #endif // QLAZILYALLOCATED_P_H |
145 | |