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| |
| #ifndef QT3DRENDER_QABSTRACTFUNCTOR_H |
| #define QT3DRENDER_QABSTRACTFUNCTOR_H |
| |
| #include <Qt3DRender/qt3drender_global.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace Qt3DRender { |
| |
| // This will generate a unique id() function per type |
| // <=> 1 unique function address per type |
| template<class T> |
| struct FunctorType |
| { |
| static qintptr id() |
| { |
| // The MSVC linker can under some cases optimize all the template |
| // functions into a single function. The code below is there to ensure |
| // that the linker won't collapse all these distincts functions into one |
| static T *t = nullptr; |
| return reinterpret_cast<qintptr>(t); |
| } |
| }; |
| |
| template<class T> |
| qintptr functorTypeId() |
| { |
| return reinterpret_cast<qintptr>(&FunctorType<T>::id); |
| } |
| |
| #define QT3D_FUNCTOR(Class) \ |
| qintptr id() const override { \ |
| return Qt3DRender::functorTypeId<Class>(); \ |
| } |
| |
| |
| class Q_3DRENDERSHARED_EXPORT QAbstractFunctor |
| { |
| public: |
| QAbstractFunctor() = default; |
| virtual ~QAbstractFunctor(); |
| virtual qintptr id() const = 0; |
| |
| // TODO: Remove when moving a copy of this to Qt3DCore |
| template<class T> |
| const T *functor_cast(const QAbstractFunctor *other) const |
| { |
| if (other->id() == functorTypeId<T>()) |
| return static_cast<const T *>(other); |
| return nullptr; |
| } |
| private: |
| Q_DISABLE_COPY(QAbstractFunctor) |
| }; |
| |
| template<class T> |
| const T *functor_cast(const QAbstractFunctor *other) |
| { |
| if (other->id() == functorTypeId<T>()) |
| return static_cast<const T *>(other); |
| return nullptr; |
| } |
| |
| } // Qt3D |
| |
| QT_END_NAMESPACE |
| |
| #endif // QT3DRENDER_QABSTRACTFUNCTOR_H |