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39
40#ifndef QPOINTER_H
41#define QPOINTER_H
42
43#include <QtCore/qsharedpointer.h>
44#include <QtCore/qtypeinfo.h>
45
46#ifndef QT_NO_QOBJECT
47
48QT_BEGIN_NAMESPACE
49
50class QVariant;
51
52template <class T>
53class QPointer
54{
55 Q_STATIC_ASSERT_X(!std::is_pointer<T>::value, "QPointer's template type must not be a pointer type");
56
57 template<typename U>
58 struct TypeSelector
59 {
60 typedef QObject Type;
61 };
62 template<typename U>
63 struct TypeSelector<const U>
64 {
65 typedef const QObject Type;
66 };
67 typedef typename TypeSelector<T>::Type QObjectType;
68 QWeakPointer<QObjectType> wp;
69public:
70 inline QPointer() { }
71 inline QPointer(T *p) : wp(p, true) { }
72 // compiler-generated copy/move ctor/assignment operators are fine!
73 // compiler-generated dtor is fine!
74
75#ifdef Q_QDOC
76 // Stop qdoc from complaining about missing function
77 ~QPointer();
78#endif
79
80 inline void swap(QPointer &other) { wp.swap(other.wp); }
81
82 inline QPointer<T> &operator=(T* p)
83 { wp.assign(static_cast<QObjectType*>(p)); return *this; }
84
85 inline T* data() const
86 { return static_cast<T*>( wp.data()); }
87 inline T* operator->() const
88 { return data(); }
89 inline T& operator*() const
90 { return *data(); }
91 inline operator T*() const
92 { return data(); }
93
94 inline bool isNull() const
95 { return wp.isNull(); }
96
97 inline void clear()
98 { wp.clear(); }
99};
100template <class T> Q_DECLARE_TYPEINFO_BODY(QPointer<T>, Q_MOVABLE_TYPE);
101
102template <class T>
103inline bool operator==(const T *o, const QPointer<T> &p)
104{ return o == p.operator->(); }
105
106template<class T>
107inline bool operator==(const QPointer<T> &p, const T *o)
108{ return p.operator->() == o; }
109
110template <class T>
111inline bool operator==(T *o, const QPointer<T> &p)
112{ return o == p.operator->(); }
113
114template<class T>
115inline bool operator==(const QPointer<T> &p, T *o)
116{ return p.operator->() == o; }
117
118template<class T>
119inline bool operator==(const QPointer<T> &p1, const QPointer<T> &p2)
120{ return p1.operator->() == p2.operator->(); }
121
122template <class T>
123inline bool operator!=(const T *o, const QPointer<T> &p)
124{ return o != p.operator->(); }
125
126template<class T>
127inline bool operator!= (const QPointer<T> &p, const T *o)
128{ return p.operator->() != o; }
129
130template <class T>
131inline bool operator!=(T *o, const QPointer<T> &p)
132{ return o != p.operator->(); }
133
134template<class T>
135inline bool operator!= (const QPointer<T> &p, T *o)
136{ return p.operator->() != o; }
137
138template<class T>
139inline bool operator!= (const QPointer<T> &p1, const QPointer<T> &p2)
140{ return p1.operator->() != p2.operator->() ; }
141
142template<typename T>
143QPointer<T>
144qPointerFromVariant(const QVariant &variant)
145{
146 return QPointer<T>(qobject_cast<T*>(QtSharedPointer::weakPointerFromVariant_internal(variant).data()));
147}
148
149QT_END_NAMESPACE
150
151#endif // QT_NO_QOBJECT
152
153#endif // QPOINTER_H
154