#includeThis code is using the Qt package library for the QDialog and QDialogButtonBox classes. The QDialogButtonBox is created with the Ok and Cancel buttons using the QDialogButtonBox::Ok and QDialogButtonBox::Cancel enum values. It is connected to the QDialog's accept and reject slots using the connect() function. Overall, the QDialogButtonBox provides a convenient and customizable way to add buttons to a QDialog in C++.#include void createDialog() { QDialog dialog(nullptr); QDialogButtonBox buttonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel, Qt::Horizontal, &dialog); connect(&buttonBox, &QDialogButtonBox::accepted, &dialog, &QDialog::accept); connect(&buttonBox, &QDialogButtonBox::rejected, &dialog, &QDialog::reject); // add other widgets to dialog... dialog.exec(); }