diff options
Diffstat (limited to 'src/corelib/tools/qsharedpointer_impl.h')
-rw-r--r-- | src/corelib/tools/qsharedpointer_impl.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/src/corelib/tools/qsharedpointer_impl.h b/src/corelib/tools/qsharedpointer_impl.h index 7dafa4981c..fe79aa1db1 100644 --- a/src/corelib/tools/qsharedpointer_impl.h +++ b/src/corelib/tools/qsharedpointer_impl.h @@ -91,6 +91,7 @@ template<typename T> inline void qt_sharedpointer_cast_check(T *) { } // template <class T> class QWeakPointer; template <class T> class QSharedPointer; +template <class T> class QEnableSharedFromThis; class QVariant; @@ -479,6 +480,14 @@ private: delete d; } + template <class X> + inline void enableSharedFromThis(const QEnableSharedFromThis<X> *ptr) + { + ptr->initializeFromSharedPointer(*this); + } + + inline void enableSharedFromThis(...) {} + template <typename Deleter> inline void internalConstruct(T *ptr, Deleter deleter) { @@ -499,6 +508,7 @@ private: internalSafetyCheckAdd(d, ptr); #endif d->setQObjectShared(ptr, true); + enableSharedFromThis(ptr); } template <class X> @@ -707,6 +717,37 @@ public: T *value; }; +template <class T> +class QEnableSharedFromThis +{ +protected: +#ifdef Q_COMPILER_DEFAULT_MEMBERS + QEnableSharedFromThis() = default; +#else + Q_DECL_CONSTEXPR QEnableSharedFromThis() {} +#endif + QEnableSharedFromThis(const QEnableSharedFromThis &) {} + QEnableSharedFromThis &operator=(const QEnableSharedFromThis &) { return *this; } + +public: + inline QSharedPointer<T> sharedFromThis() { return QSharedPointer<T>(weakPointer); } + inline QSharedPointer<const T> sharedFromThis() const { return QSharedPointer<const T>(weakPointer); } + +#ifndef Q_NO_TEMPLATE_FRIENDS +private: + template <class X> friend class QSharedPointer; +#else +public: +#endif + template <class X> + inline void initializeFromSharedPointer(const QSharedPointer<X> &ptr) const + { + weakPointer = ptr; + } + + mutable QWeakPointer<T> weakPointer; +}; + // // operator== and operator!= // |