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** this package.
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//! [0]
QSet<QString> set;
//! [0]


//! [1]
set.insert("one");
set.insert("three");
set.insert("seven");
//! [1]


//! [2]
set << "twelve" << "fifteen" << "nineteen";
//! [2]


//! [3]
if (!set.contains("ninety-nine"))
    ...
//! [3]


//! [4]
QSetIterator<QWidget *> i(set);
while (i.hasNext())
    qDebug() << i.next();
//! [4]


//! [5]
QSet<QWidget *>::const_iterator i = set.constBegin();
while (i != set.constEnd()) {
    qDebug() << *i;
    ++i;
}
//! [5]


//! [6]
QSet<QString> set;
...
foreach (QString value, set)
    qDebug() << value;
//! [6]


//! [7]
QSet<QString> set;
set.reserve(20000);
for (int i = 0; i < 20000; ++i)
    set.insert(values[i]);
//! [7]


//! [8]
QSet<QString> set;
set << "January" << "February" << ... << "December";

QSet<QString>::iterator i;
for (i = set.begin(); i != set.end(); ++i)
    qDebug() << *i;
//! [8]


//! [9]
QSet<QString> set;
set << "January" << "February" << ... << "December";

QSet<QString>::iterator i = set.begin();
while (i != set.end()) {
    if ((*i).startsWith('J')) {
        i = set.erase(i);
    } else {
        ++i;
    }
}
//! [9]


//! [10]
QSet<QString> set;
...
QSet<QString>::iterator it = qFind(set.begin(), set.end(), "Jeanette");
if (it != set.end())
    cout << "Found Jeanette" << endl;
//! [10]


//! [11]
QSet<QString> set;
set << "January" << "February" << ... << "December";

QSet<QString>::const_iterator i;
for (i = set.begin(); i != set.end(); ++i)
    qDebug() << *i;
//! [11]


//! [12]
QSet<QString> set;
...
QSet<QString>::iterator it = qFind(set.begin(), set.end(), "Jeanette");
if (it != set.constEnd())
    cout << "Found Jeanette" << endl;
//! [12]


//! [13]
QSet<QString> set;
set << "red" << "green" << "blue" << ... << "black";

QList<QString> list = set.toList();
qSort(list);
//! [13]


//! [14]
QStringList list;
list << "Julia" << "Mike" << "Mike" << "Julia" << "Julia";

QSet<QString> set = QSet<QString>::fromList(list);
set.contains("Julia");  // returns true
set.contains("Mike");   // returns true
set.size();             // returns 2
//! [14]