unique_ptr operator overloading is disabled by QScopedPointer

DungeonLords

In my example
QScopedPointer or std::unique_ptr disable operator overloading. Can I use my operator overloading with QScopedPointer or unique_ptr?

    class1 cl1;
    std::unique_ptr<class1> cl2;
    QScopedPointer<class1> cl3;
    QBuffer buffer;
    buffer.open(QIODevice::WriteOnly);
    QDataStream myStream(&buffer);
    myStream << cl1 << "    " << cl2.get() << "    " << cl3.get();
    qDebug() << buffer.data();

output

"\x00\x00\x00\x0E\x00""d\x00""e\x00""f\x00""a\x00u\x00l\x00t\x00\x00\x00\x05    \x00\x00\x00\x00\x00\x05    \x00\x00"

I make full code example based on topic

ChrisW67

The posted code will not compile for me (Linux, GCC13, Qt 6.7.2):

/tmp/unique_ptr_operator_overloading_unique_ptr/src/main.cpp: In function ‘int main(int, char**)’:
/tmp/unique_ptr_operator_overloading_unique_ptr/src/main.cpp:15:42: error: use of deleted function ‘QDataStream& QDataStream::operator<<(const volatile void*)’
   15 |     myStream << cl1 << "    " << cl2.get() << "    " << cl3.get();
      |                                          ^

uniqueptr::get() and QScopedPointer::get() return pointers and there is no suitable streaming operator according to my compiler.

Anyway, @VRonin is correct but you need to initialise cl2 and cl3 with valid pointers. Presently, cl2 and cl3 are wrappers on nullptrs, so deferencing these might be terminal.

    class1 cl1;
    std::unique_ptr<class1> cl2 = std::make_unique<class1>();
    QScopedPointer<class1> cl3(new class1);
    QBuffer buffer;
    buffer.open(QIODevice::WriteOnly);
    QDataStream myStream(&buffer);
    myStream << cl1 << "    " << *cl2 << "    " << *cl3;
    qDebug() << buffer.data();
    return a.exec();
}

VRonin

You can just dereference the pointer...
myStream << cl1 << " " << *cl2 << " " << *cl3;

ChrisW67

The posted code will not compile for me (Linux, GCC13, Qt 6.7.2):

/tmp/unique_ptr_operator_overloading_unique_ptr/src/main.cpp: In function ‘int main(int, char**)’:
/tmp/unique_ptr_operator_overloading_unique_ptr/src/main.cpp:15:42: error: use of deleted function ‘QDataStream& QDataStream::operator<<(const volatile void*)’
   15 |     myStream << cl1 << "    " << cl2.get() << "    " << cl3.get();
      |                                          ^

uniqueptr::get() and QScopedPointer::get() return pointers and there is no suitable streaming operator according to my compiler.

Anyway, @VRonin is correct but you need to initialise cl2 and cl3 with valid pointers. Presently, cl2 and cl3 are wrappers on nullptrs, so deferencing these might be terminal.

    class1 cl1;
    std::unique_ptr<class1> cl2 = std::make_unique<class1>();
    QScopedPointer<class1> cl3(new class1);
    QBuffer buffer;
    buffer.open(QIODevice::WriteOnly);
    QDataStream myStream(&buffer);
    myStream << cl1 << "    " << *cl2 << "    " << *cl3;
    qDebug() << buffer.data();
    return a.exec();
}

DungeonLords

Thanks @ChrisW67 @VRonin problem solved! I updated my repo for another beginners...