QTabWidget::QTabWidget(const QTabWidget&)' is private

[mehdi.nine]

I develop a program and have 10 backup from it. i add some line to it and when i compile project it have following error:
@
C:\Qt\Qt5.0.1\5.0.1\mingw47_32\include\QtWidgets\qtabwidget.h:173: error: 'QTabWidget::QTabWidget(const QTabWidget&)' is private
@
the error is from * line
@
namespace Ui {
class ContentControl;
}

class ContentControl:public QTabWidget //* from this line///////////////////////////////
{
Q_OBJECT

public:
.
.
.
}
@
all backups has this error now. any idea? i re install QT but problem has exist.

[tobias.hunger]

The error is correct, you can not copy QObjects (and all QWidgets are QObjects).

My guess is that you have a copy constructor defined for ContentControl.

Try reinstalling Qt a couple more times and then fix your code when you are tired of doing that:)

[Chris Kawa]

The copy constructor is generated automatically if you don't prevent it manually (by declaring it private or via c++11 delete).

These are few (horrible) examples that could generate this error:
@
ContentControl c1;
ContentControl c2 = c1; // error

void someFunction(ContentControl) {...}
someFunction(c1); //error

ContentControl someFunc2() { return ContentControl; }
someFunc2(); //error
@
In short don't try to pass QObjects by value.

[mehdi.nine]

thanks for you reply the problem has solved when i delete ContentControl that send to another class.