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

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//! [0]
QStringList wordList;
wordList << "alpha" << "omega" << "omicron" << "zeta";

QLineEdit *lineEdit = new QLineEdit(this);

QCompleter *completer = new QCompleter(wordList, this);
completer->setCaseSensitivity(Qt::CaseInsensitive);
lineEdit->setCompleter(completer);
//! [0]


//! [1]
QCompleter *completer = new QCompleter(this);
completer->setModel(new QFileSystemModel(completer));
lineEdit->setCompleter(completer);
//! [1]


//! [2]
for (int i = 0; completer->setCurrentRow(i); i++)
    qDebug() << completer->currentCompletion() << " is match number " << i;
//! [2]