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Bug
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Resolution: Done
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P3: Somewhat important
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5.10.0
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None
I found that QSharedDataPointer detaches in situation where it is unexpected.
For example:
QSharedDataPointer<foo> head; ... auto node = head; if (!node) // DO NOT cause detach() if (node == nullptr) // causes detach() if (node != nullptr) // causes detach() if (node) // causes detach()
Unless there is a good reason, I think this should not happen.
This can easily be solved eg. with stuff like:
template <class T> bool operator==(const QSharedDataPointer<T>& p, nullptr_t) { return p.constData() == nullptr; } template <class T> bool operator==(nullptr_t, const QSharedDataPointer<T>& p) { return p.constData() == nullptr; } template <class T> bool operator!=(nullptr_t, const QSharedDataPointer<T>& p) { return !!p; } template <class T> bool operator!=(const QSharedDataPointer<T>& p, nullptr_t) { return !!p; }
And by adding a bool operator.
On another hand, curiously, QExplicitlySharedDataPointer has an operator bool ()
- replaces
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QTBUG-66946 QSharedDataPointer detaches on ptrInst == nullptr
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- Closed
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