Why is foreach iterating with a const reference?

Question

I try to do the following:

QList a;
foreach(QString& s, a)
{
    s += \"s\";
}

Which looks like it should be legitimate but

Answer 1

I believe Qt's foreach takes a temporary copy of the original collection before iterating over it, therefore it wouldn't make any sense to have a non-const reference as modifying the temporary copy it would have no effect.