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| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the QtXmlPatterns module of the Qt Toolkit. |
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| |
| // |
| // W A R N I N G |
| // ------------- |
| // |
| // This file is not part of the Qt API. It exists purely as an |
| // implementation detail. This header file may change from version to |
| // version without notice, or even be removed. |
| // |
| // We mean it. |
| |
| #ifndef QPatternist_ReferenceCountedValue_p_h |
| #define QPatternist_ReferenceCountedValue_p_h |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QPatternist |
| { |
| /*! |
| \class ReferenceCountedValue |
| \internal |
| \since 4.4 |
| \brief A template class that reference counts a value. |
| |
| This class is useful when an instance needs to have ownership semantics |
| as if it was value based. A typical examples is a QObject pointer, which |
| doesn't have a single owner. |
| |
| This is achieved through storing a copy of the object as |
| a member inside ReferenceCountedValue, which never is copied. It will |
| stay in scope until the last reference to the ReferenceCountedValue instance |
| is removed, and subsequently ReferenceCountedValue is deleted and hence also |
| the contained value. One should use ReferenceCountedValue by passing around |
| copies of Ptr, which is a typedef for the QExplicitlySharedDataPointer |
| smart pointer. |
| */ |
| template<typename T> |
| class ReferenceCountedValue : public QSharedData |
| { |
| public: |
| typedef QExplicitlySharedDataPointer<ReferenceCountedValue<T> > Ptr; |
| |
| inline ReferenceCountedValue(T *const v) : value(v) |
| { |
| } |
| |
| inline ~ReferenceCountedValue() |
| { |
| delete value; |
| } |
| |
| T *const value; |
| private: |
| /*! |
| Disabled, no implementation provided. |
| */ |
| inline ReferenceCountedValue(); |
| Q_DISABLE_COPY(ReferenceCountedValue) |
| }; |
| } |
| |
| QT_END_NAMESPACE |
| |
| #endif |