QSharedPointer forward declare, compile warnings persist.

[pkj]

QSharedPointer gives nasty compile time warnings if the class whose smart pointer is being made is forward declared. QScopedPointer documentation has some documentation on how to avoid warnings with forward declaration. As has been pointed out in this bug, works for QSharedPointer too...
https://bugreports.qt-project.org/browse/QTBUG-7302

However compiler warnings persist for me... consider code...

class MyPrivateClass; // forward declare MyPrivateClass
 
 class MyClass
 {
 private:
     QList<QScopedPointer<MyPrivateClass> > privatePtr; //QList QScopedPointer to forward declared class
 
 public:
     MyClass(); // OK
     ~MyClass(); // Not a VIOLATION - Destructor must not be inline
 
 private:
     Q_DISABLE_COPY(MyClass) // OK - copy constructor and assignment operators
                              // are now disabled, so the compiler won't implicitely
                              // generate them.
};

class MyPrivateClass; // forward declare MyPrivateClass

 class MyClass
 {
 private:
     QList<QScopedPointer<MyPrivateClass> > privatePtr; //QList QScopedPointer to forward declared class

 public:
     MyClass(); // OK
     ~MyClass(); // Not a VIOLATION - Destructor must not be inline

 private:
     Q_DISABLE_COPY(MyClass) // OK - copy constructor and assignment operators
                              // are now disabled, so the compiler won't implicitely
                              // generate them.
};

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Any way to avoid the warnings.. the qt version is 4.8.4... the bug is apparently fixed in 5.0 but can't shift.

[amleto]

great, thanks.

Do you have a question?

[ChrisW67]

You cannot put QScopedPointers into a QList because to do so requires the ability to copy the QScopedPointer, which is is expressly disabled by a private copy constructor. This generates nasty errors, not warnings.

If you were using QSharedPointer then the issue goes away.