How to check if the contents of QComboBox are empty or not?

[Surabhi]

I am a beginner in Qt and probably this is a very easy task but i wanted to know how to find if a QCombobox is empty or not?
I tried to do something like this
if(ui.ComboBox->currentIndex(-1))
But this is not working for me and gives me an error that "too many arguments in function call"

[Gerhard]

if (ui.ComboBox->count() == 0)