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

With C++11, Qt now encourages this standard for syntax instead of Qt foreach :

QList a;
for(auto& s : a)
{
    s += "s";
}