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39
40#ifndef QT3DRENDER_QABSTRACTFUNCTOR_H
41#define QT3DRENDER_QABSTRACTFUNCTOR_H
42
43#include <Qt3DRender/qt3drender_global.h>
44
45QT_BEGIN_NAMESPACE
46
47namespace Qt3DRender {
48
49// This will generate a unique id() function per type
50// <=> 1 unique function address per type
51template<class T>
52struct FunctorType
53{
54 static qintptr id()
55 {
56 // The MSVC linker can under some cases optimize all the template
57 // functions into a single function. The code below is there to ensure
58 // that the linker won't collapse all these distincts functions into one
59 static T *t = nullptr;
60 return reinterpret_cast<qintptr>(t);
61 }
62};
63
64template<class T>
65Q3D_DECL_DEPRECATED qintptr functorTypeId()
66{
67 return reinterpret_cast<qintptr>(&FunctorType<T>::id);
68}
69
70#define QT3D_FUNCTOR(Class) \
71 qintptr id() const override { \
72 return Qt3DRender::functorTypeId<Class>(); \
73 }
74
75
76class Q_3DRENDERSHARED_EXPORT QAbstractFunctor
77{
78public:
79 Q3D_DECL_DEPRECATED QAbstractFunctor() = default;
80 virtual ~QAbstractFunctor();
81 virtual qintptr id() const = 0;
82
83 // TODO: Remove when moving a copy of this to Qt3DCore
84 template<class T>
85 const T *functor_cast(const QAbstractFunctor *other) const
86 {
87 if (other->id() == functorTypeId<T>())
88 return static_cast<const T *>(other);
89 return nullptr;
90 }
91private:
92 Q_DISABLE_COPY(QAbstractFunctor)
93};
94
95template<class T>
96const T *functor_cast(const QAbstractFunctor *other)
97{
98 if (other->id() == functorTypeId<T>())
99 return static_cast<const T *>(other);
100 return nullptr;
101}
102
103} // Qt3D
104
105QT_END_NAMESPACE
106
107#endif // QT3DRENDER_QABSTRACTFUNCTOR_H
108

source code of qt3d/src/render/frontend/qabstractfunctor.h