Solved QSet::isEmpty() return's false while no data in it

[Puppy Bear]

I've tried to compare 2 same list with
QSet<QString> add_chart = list2.toSet().subtract(list1.toSet());

while print add_chart in qdebug , it shows in console like : QSet("")
However,
add_chart.isEmpty() still returns false,
is there some reason in it and how to solve this?

create a iterator to check if Qstring.isempty()?

[J.Hilk]

@Puppy-Bear
this QSet("") doesn't look empty, it seems like there's an empty QString in it -> isEmpty() will return false

[Christian Ehrlicher]

Please show the real code, with correct test data so we can take a look what's wrong. This is fine for me:

QList<QString> list1 = {"one", "two"};
QList<QString> list2 = {"two", "one"};
QSet<QString> add_chart = list2.toSet().subtract(list1.toSet());
qDebug() << add_chart;
qDebug() << add_chart.isEmpty();
return 0;

-->

QSet()
true

[J.Hilk]

@Puppy-Bear
this QSet("") doesn't look empty, it seems like there's an empty QString in it -> isEmpty() will return false

[Puppy Bear]

@Christian-Ehrlicher Sry it's a list of data from database, so it might cannot be showned on this screen yet. Guess it's something wrong with reading the db file