Changing the type of QList

[wagmare]

Hi friends,

I was going though the qobject_cast of a QLineEdit to QWidget ... now i got the problem that im having a QList of QLineEdit and have to type cast it to QList of QWidget ..
present i was typecasting each and every QlineEdit in the list in a for() loop..

but is there any other way to change the type of a QList
Ex:

QList <QLineEdit *> lList can be typecasted to QList<QWidget*> as QLineEdit is inherited from QWidget ..


Thanks

Wagmare

[FelixB]

why do you want to do that?

[wagmare]

Thanks for reply Felix

Im having a common function having the argument

QList<QWidget *>

QList<QWidget *>

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say void myWidget::enableAll(QList<QWidget *> list)
and
im getting all the QLineEdit in one widget in a QList<QLineEdit *> lList using findChild and i have to pass to the function say
enableAll(lList)..

in this case i have to typecast each and every QLineEdit into QWidget so i can pass it as a argument ..

ex:

for(int i =0; i < lList.size(); i++)
{
       lList[i] = qobject_cast<QWidget*>(lList[i]);
}
 
enableAll(&lList);

for(int i =0; i < lList.size(); i++)
{
       lList[i] = qobject_cast<QWidget*>(lList[i]);
}

enableAll(&lList);

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but is there any other way i can easily cast a QList<QLineEdit> to QList<QWidget *>

Thanks & Regards

[stampede]

"enableAll()" could be a template method:

class MyClass ... {
protected:
    template< typename T >
    void enableAll( QList<T*>& widgets ){
        foreach( T * t, widgets ){
            t->setEnabled(true);
        }
    }
};

class MyClass ... {
protected:
    template< typename T >
    void enableAll( QList<T*>& widgets ){
        foreach( T * t, widgets ){
            t->setEnabled(true);
        }
    }
};

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You can use it like any other method now:

QList<QWidget*> widgets;
QList<QLineEdit*> lineEdits;
 
enableAll(widgets);
enableAll(lineEdits);

QList<QWidget*> widgets;
QList<QLineEdit*> lineEdits;

enableAll(widgets);
enableAll(lineEdits);

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If you use it with a type that does not have "setEnabled()" method, you will get a compile time error.

----
edit:
I think VC++ does not support member template methods, I'm using gcc, its supported there. If you are using a compiler which does not support this feature, just make this method a regular template (not a member of a class).

----
@down:
ok, my mistake

[FelixB]

I think VC++ does not support member template methods

VS2008 does