Question

can you please tell me the difference between the “point” and the “arrow”, for example :

file.open

and

->start() (with QThread)

i thought the arrow was used for “methods”, whereas the “point” is used for “attributes”, but open for example is a method.

thanks for your answer

Answer 1

It’s not just for Qt, the . is used when the variable in question is referencing the actual instance of the type/class.

Example:

QLabel label(QString("Hello"));
label.show();

The -> is used when the variable is a pointer that can hold the address of the type/class.

Example:

QLabel *label = new QLabel(QString("Hello"));
label->show();