qt-everywhere-src-5.15.1/qtbase/src/corelib/doc/snippets/code/src_corelib_tools_qlistdata.cpp

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//! [0]
QList<int> integerList;
QList<QDate> dateList;
//! [0]


//! [1a]
QList<QString> list = { "one", "two", "three" };
//! [1a]


//! [1b]
list << "four" << "five";
//! [1b]


//! [2]
if (list[0] == "Bob")
    list[0] = "Robert";
//! [2]


//! [3]
for (int i = 0; i < list.size(); ++i) {
    if (list.at(i) == "Jane")
        cout << "Found Jane at position " << i << Qt::endl;
}
//! [3]


//! [4]
QList<QWidget *> list;
...
while (!list.isEmpty())
    delete list.takeFirst();
//! [4]


//! [5]
int i = list.indexOf("Jane");
if (i != -1)
    cout << "First occurrence of Jane is at position " << i << Qt::endl;
//! [5]


//! [6]
QList<QString> list;
list.append("one");
list.append("two");
list.append("three");
// list: ["one", "two", "three"]
//! [6]


//! [7]
QList<QString> list;
list.prepend("one");
list.prepend("two");
list.prepend("three");
// list: ["three", "two", "one"]
//! [7]


//! [8]
QList<QString> list;
list << "alpha" << "beta" << "delta";
list.insert(2, "gamma");
// list: ["alpha", "beta", "gamma", "delta"]
//! [8]


//! [9]
QList<QString> list;
list << "sun" << "cloud" << "sun" << "rain";
list.removeAll("sun");
// list: ["cloud", "rain"]
//! [9]


//! [10]
QList<QString> list;
list << "sun" << "cloud" << "sun" << "rain";
list.removeOne("sun");
// list: ["cloud", "sun", "rain"]
//! [10]


//! [11]
QList<QString> list;
list << "A" << "B" << "C" << "D" << "E" << "F";
list.move(1, 4);
// list: ["A", "C", "D", "E", "B", "F"]
//! [11]


//! [12]
QList<QString> list;
list << "A" << "B" << "C" << "D" << "E" << "F";
list.swapItemsAt(1, 4);
// list: ["A", "E", "C", "D", "B", "F"]
//! [12]


//! [13]
QList<QString> list;
list << "A" << "B" << "C" << "B" << "A";
list.indexOf("B");          // returns 1
list.indexOf("B", 1);       // returns 1
list.indexOf("B", 2);       // returns 3
list.indexOf("X");          // returns -1
//! [13]


//! [14]
QList<QString> list;
list << "A" << "B" << "C" << "B" << "A";
list.lastIndexOf("B");      // returns 3
list.lastIndexOf("B", 3);   // returns 3
list.lastIndexOf("B", 2);   // returns 1
list.lastIndexOf("X");      // returns -1
//! [14]


//! [15]
QList<QString> list;
list.append("January");
list.append("February");
...
list.append("December");

QList<QString>::iterator i;
for (i = list.begin(); i != list.end(); ++i)
    cout << *i << Qt::endl;
//! [15]


//! [16]
QList<int>::iterator i;
for (i = list.begin(); i != list.end(); ++i)
    *i += 2;
//! [16]


//! [17]
QList<QWidget *> list;
...
qDeleteAll(list.begin(), list.end());
//! [17]


//! [18]
if (*it == "Hello")
    *it = "Bonjour";
//! [18]


//! [19]
QList<QString> list;
list.append("January");
list.append("February");
...
list.append("December");

QList<QString>::const_iterator i;
for (i = list.constBegin(); i != list.constEnd(); ++i)
    cout << *i << Qt::endl;
//! [19]


//! [20]
QList<QWidget *> list;
...
qDeleteAll(list.constBegin(), list.constEnd());
//! [20]


//! [21]
QVector<double> vect;
vect << 20.0 << 30.0 << 40.0 << 50.0;

QList<double> list = QVector<T>::fromVector(vect);
// list: [20.0, 30.0, 40.0, 50.0]
//! [21]


//! [22]
QStringList list;
list << "Sven" << "Kim" << "Ola";

QVector<QString> vect = list.toVector();
// vect: ["Sven", "Kim", "Ola"]
//! [22]


//! [23]
QSet<int> set;
set << 20 << 30 << 40 << ... << 70;

QList<int> list = QList<int>::fromSet(set);
std::sort(list.begin(), list.end());
//! [23]


//! [24]
QStringList list;
list << "Julia" << "Mike" << "Mike" << "Julia" << "Julia";

QSet<QString> set = list.toSet();
set.contains("Julia");  // returns true
set.contains("Mike");   // returns true
set.size();             // returns 2
//! [24]


//! [25]
std::list<double> stdlist;
list.push_back(1.2);
list.push_back(0.5);
list.push_back(3.14);

QList<double> list = QList<double>::fromStdList(stdlist);
//! [25]


//! [26]
QList<double> list;
list << 1.2 << 0.5 << 3.14;

std::list<double> stdlist = list.toStdList();
//! [26]