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36 | |
37 | #ifndef QQUICKDEFERREDPOINTER_P_P_H |
38 | #define QQUICKDEFERREDPOINTER_P_P_H |
39 | |
40 | // |
41 | // W A R N I N G |
42 | // ------------- |
43 | // |
44 | // This file is not part of the Qt API. It exists purely as an |
45 | // implementation detail. This header file may change from version to |
46 | // version without notice, or even be removed. |
47 | // |
48 | // We mean it. |
49 | // |
50 | |
51 | #include <QtCore/qglobal.h> |
52 | |
53 | QT_BEGIN_NAMESPACE |
54 | |
55 | template<typename T> |
56 | class QQuickDeferredPointer |
57 | { |
58 | public: |
59 | inline QQuickDeferredPointer(); |
60 | inline QQuickDeferredPointer(T *); |
61 | inline QQuickDeferredPointer(const QQuickDeferredPointer<T> &o); |
62 | |
63 | inline bool isNull() const; |
64 | |
65 | inline bool wasExecuted() const; |
66 | inline void setExecuted(); |
67 | |
68 | inline bool isExecuting() const; |
69 | inline void setExecuting(bool); |
70 | |
71 | inline operator T*() const; |
72 | inline operator bool() const; |
73 | |
74 | inline T *data() const; |
75 | inline T *operator*() const; |
76 | inline T *operator->() const; |
77 | |
78 | inline QQuickDeferredPointer<T> &operator=(T *); |
79 | inline QQuickDeferredPointer<T> &operator=(const QQuickDeferredPointer &o); |
80 | |
81 | private: |
82 | quintptr ptr_value = 0; |
83 | |
84 | static const quintptr WasExecutedBit = 0x1; |
85 | static const quintptr IsExecutingBit = 0x2; |
86 | static const quintptr FlagsMask = WasExecutedBit | IsExecutingBit; |
87 | }; |
88 | |
89 | template<typename T> |
90 | QQuickDeferredPointer<T>::QQuickDeferredPointer() |
91 | { |
92 | } |
93 | |
94 | template<typename T> |
95 | QQuickDeferredPointer<T>::QQuickDeferredPointer(T *v) |
96 | : ptr_value(quintptr(v)) |
97 | { |
98 | Q_ASSERT((ptr_value & FlagsMask) == 0); |
99 | } |
100 | |
101 | template<typename T> |
102 | QQuickDeferredPointer<T>::QQuickDeferredPointer(const QQuickDeferredPointer<T> &o) |
103 | : ptr_value(o.ptr_value) |
104 | { |
105 | } |
106 | |
107 | template<typename T> |
108 | bool QQuickDeferredPointer<T>::isNull() const |
109 | { |
110 | return 0 == (ptr_value & (~FlagsMask)); |
111 | } |
112 | |
113 | template<typename T> |
114 | bool QQuickDeferredPointer<T>::wasExecuted() const |
115 | { |
116 | return ptr_value & WasExecutedBit; |
117 | } |
118 | |
119 | template<typename T> |
120 | void QQuickDeferredPointer<T>::setExecuted() |
121 | { |
122 | ptr_value |= WasExecutedBit; |
123 | } |
124 | |
125 | template<typename T> |
126 | bool QQuickDeferredPointer<T>::isExecuting() const |
127 | { |
128 | return ptr_value & IsExecutingBit; |
129 | } |
130 | |
131 | template<typename T> |
132 | void QQuickDeferredPointer<T>::setExecuting(bool b) |
133 | { |
134 | if (b) |
135 | ptr_value |= IsExecutingBit; |
136 | else |
137 | ptr_value &= ~IsExecutingBit; |
138 | } |
139 | |
140 | template<typename T> |
141 | QQuickDeferredPointer<T>::operator T*() const |
142 | { |
143 | return data(); |
144 | } |
145 | |
146 | template<typename T> |
147 | QQuickDeferredPointer<T>::operator bool() const |
148 | { |
149 | return !isNull(); |
150 | } |
151 | |
152 | template<typename T> |
153 | T *QQuickDeferredPointer<T>::data() const |
154 | { |
155 | return (T *)(ptr_value & ~FlagsMask); |
156 | } |
157 | |
158 | template<typename T> |
159 | T *QQuickDeferredPointer<T>::operator*() const |
160 | { |
161 | return (T *)(ptr_value & ~FlagsMask); |
162 | } |
163 | |
164 | template<typename T> |
165 | T *QQuickDeferredPointer<T>::operator->() const |
166 | { |
167 | return (T *)(ptr_value & ~FlagsMask); |
168 | } |
169 | |
170 | template<typename T> |
171 | QQuickDeferredPointer<T> &QQuickDeferredPointer<T>::operator=(T *o) |
172 | { |
173 | Q_ASSERT((quintptr(o) & FlagsMask) == 0); |
174 | |
175 | ptr_value = quintptr(o) | (ptr_value & FlagsMask); |
176 | return *this; |
177 | } |
178 | |
179 | template<typename T> |
180 | QQuickDeferredPointer<T> &QQuickDeferredPointer<T>::operator=(const QQuickDeferredPointer &o) |
181 | { |
182 | ptr_value = o.ptr_value; |
183 | return *this; |
184 | } |
185 | |
186 | QT_END_NAMESPACE |
187 | |
188 | #endif // QQUICKDEFERREDPOINTER_P_P_H |
189 |