| 1 | // Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB). |
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| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
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| 3 | |
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| 4 | #ifndef QT3DCORE_QABSTRACTFUNCTOR_H |
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| 5 | #define QT3DCORE_QABSTRACTFUNCTOR_H |
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| 6 | |
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| 7 | #include <Qt3DCore/qt3dcore_global.h> |
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| 8 | |
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| 9 | QT_BEGIN_NAMESPACE |
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| 10 | |
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| 11 | namespace Qt3DCore { |
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| 12 | |
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| 13 | // This will generate a unique id() function per type |
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| 14 | // <=> 1 unique function address per type |
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| 15 | template<class T> |
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| 16 | struct FunctorType |
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| 17 | { |
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| 18 | static qintptr id() |
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| 19 | { |
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| 20 | // The MSVC linker can under some cases optimize all the template |
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| 21 | // functions into a single function. The code below is there to ensure |
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| 22 | // that the linker won't collapse all these distincts functions into one |
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| 23 | static T *t = nullptr; |
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| 24 | return reinterpret_cast<qintptr>(t); |
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| 25 | } |
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| 26 | }; |
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| 27 | |
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| 28 | template<class T> |
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| 29 | qintptr functorTypeId() |
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| 30 | { |
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| 31 | return reinterpret_cast<qintptr>(&FunctorType<T>::id); |
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| 32 | } |
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| 33 | |
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| 34 | #define QT3D_FUNCTOR(Class) \ |
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| 35 | qintptr id() const override { \ |
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| 36 | return Qt3DCore::functorTypeId<Class>(); \ |
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| 37 | } |
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| 38 | |
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| 39 | |
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| 40 | class Q_3DCORESHARED_EXPORT QAbstractFunctor |
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| 41 | { |
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| 42 | public: |
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| 43 | QAbstractFunctor() = default; |
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| 44 | virtual ~QAbstractFunctor(); |
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| 45 | virtual qintptr id() const = 0; |
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| 46 | |
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| 47 | // TODO: Remove when moving a copy of this to Qt3DCore |
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| 48 | template<class T> |
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| 49 | const T *functor_cast(const QAbstractFunctor *other) const |
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| 50 | { |
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| 51 | if (other->id() == functorTypeId<T>()) |
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| 52 | return static_cast<const T *>(other); |
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| 53 | return nullptr; |
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| 54 | } |
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| 55 | private: |
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| 56 | Q_DISABLE_COPY(QAbstractFunctor) |
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| 57 | }; |
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| 58 | |
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| 59 | template<class T> |
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| 60 | const T *functor_cast(const QAbstractFunctor *other) |
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| 61 | { |
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| 62 | if (other->id() == functorTypeId<T>()) |
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| 63 | return static_cast<const T *>(other); |
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| 64 | return nullptr; |
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| 65 | } |
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| 66 | |
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| 67 | } // Qt3DCore |
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| 68 | |
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| 69 | QT_END_NAMESPACE |
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| 70 | |
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| 71 | #endif // QT3DCORE_QABSTRACTFUNCTOR_H |
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| 72 | |
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