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

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//! [0]
QVector<int> integerVector;
QVector<QString> stringVector;
//! [0]


//! [1]
QVector<QString> vector(200);
//! [1]


//! [2]
QVector<QString> vector(200, "Pass");
//! [2]


//! [3]
if (vector[0] == "Liz")
    vector[0] = "Elizabeth";
//! [3]


//! [4]
for (int i = 0; i < vector.size(); ++i) {
    if (vector.at(i) == "Alfonso")
        cout << "Found Alfonso at position " << i << endl;
}
//! [4]


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


//! [6]
QVector<int> vector(10);
int *data = vector.data();
for (int i = 0; i < 10; ++i)
    data[i] = 2 * i;
//! [6]


//! [7]
QVector<QString> vector(0);
vector.append("one");
vector.append("two");
vector.append("three");
// vector: ["one", "two", "three"]
//! [7]


//! [8]
QVector<QString> vector;
vector.prepend("one");
vector.prepend("two");
vector.prepend("three");
// vector: ["three", "two", "one"]
//! [8]


//! [9]
QVector<QString> vector;
vector << "alpha" << "beta" << "delta";
vector.insert(2, "gamma");
// vector: ["alpha", "beta", "gamma", "delta"]
//! [9]


//! [10]
QVector<double> vector;
vector << 2.718 << 1.442 << 0.4342;
vector.insert(1, 3, 9.9);
// vector: [2.718, 9.9, 9.9, 9.9, 1.442, 0.4342]
//! [10]


//! [11]
QVector<QString> vector(3);
vector.fill("Yes");
// vector: ["Yes", "Yes", "Yes"]

vector.fill("oh", 5);
// vector: ["oh", "oh", "oh", "oh", "oh"]
//! [11]


//! [12]
QVector<QString> vector;
vector << "A" << "B" << "C" << "B" << "A";
vector.indexOf("B");            // returns 1
vector.indexOf("B", 1);         // returns 1
vector.indexOf("B", 2);         // returns 3
vector.indexOf("X");            // returns -1
//! [12]


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


//! [14]
QVector<double> vect;
vect << "red" << "green" << "blue" << "black";

QList<double> list = vect.toList();
// list: ["red", "green", "blue", "black"]
//! [14]


//! [15]
QStringList list;
list << "Sven" << "Kim" << "Ola";

QVector<QString> vect = QVector<QString>::fromList(list);
// vect: ["Sven", "Kim", "Ola"]
//! [15]


//! [16]
std::vector<double> stdvector;
vector.push_back(1.2);
vector.push_back(0.5);
vector.push_back(3.14);

QVector<double> vector = QVector<double>::fromStdVector(stdvector);
//! [16]


//! [17]
QVector<double> vector;
vector << 1.2 << 0.5 << 3.14;

std::vector<double> stdvector = vector.toStdVector();
//! [17]