Using QObjectPointerList in Qt3

[importantman]

I am getting a wierd compiler error in this code:


const QObjectList *l = boxLayout->children();

for ( unsigned int i = topLine; i != l->count(); i++ )
{
QObject *obj = l->at(i);
if( !((PositionElementLine*)obj)->isChecked() )
firstUnchecked = i;
}


gcc objects to line 5 with this message:


error: passing 'const QObjectList' as 'this' argument of 'type* QPtrList<type>::at(uint) [with type = QObject]' discards qualifiers

[vermarajeev]

I am getting a wierd compiler error in this code:


const QObjectList *l = boxLayout->children();

for ( unsigned int i = topLine; i != l->count(); i++ )
{
QObject *obj = l->at(i);
if( !((PositionElementLine*)obj)->isChecked() )
firstUnchecked = i;
}


gcc objects to line 5 with this message:

Did you try typecsating

const QObjectList *l = (QObjectList *)boxLayout->children();

[Gopala Krishna]

I am getting a wierd compiler error in this code:


const QObjectList *l = boxLayout->children();

for ( unsigned int i = topLine; i != l->count(); i++ )
{
QObject *obj = l->at(i);
if( !((PositionElementLine*)obj)->isChecked() )
firstUnchecked = i;
}


gcc objects to line 5 with this message:

There are two solutions.
If PositionElementLine::isChecked() is a const function(actually it has to be if the classes are well designed) then use the following at the respective place

const QObject *obj = l->at(i);
if( !((const PositionElementLine*)obj)->isChecked() )
firstUnchecked = i;

If PositionElementLine::isChecked() is not a const function then use type casting as follows

QObject *obj = const_cast<QObject*>(l->at(i));
if( !((PositionElementLine*)obj)->isChecked() )
firstUnchecked = i;