QList and QPoints error: passing 'const QPointF' as 'this' argument of 'qreal& QPointF::rx()' discards qualifiers

metty

Hello,

I have a QList with QPoints:
QList<QPointF> points;

Why does this work:
qDebug()<<points.first().rx();

and this not:?
qDebug()<<points.at(0).rx();

thank you for you help!

SGaist

Hi,

Because at returns a const reference while first can either return a reference or a const reference and rx is a non const method of QPointF.

alex_malyu

I just want to add that you should not use non const methods when you can use const methods anyway.

qDebug()<<points.at(0).x();

metty

super, thank you! that solved my litttle problem.