How to place an icon onto a QLineEdit?

Question

There is a Search field with the magnification-lens and a greyed out \"search\" keyword at the top right corner of stackoverflow.com web site:

Answer 1

QLineEdit* _lineEdit = new QLineEdit();
_lineEdit->setClearButtonEnabled(true);
_lineEdit->addAction(":/resources/search.ico", QLineEdit::LeadingPosition);
_lineEdit->setPlaceHolderText("Search...");

extracted from: http://saurabhg.com/programming/search-box-using-qlineedit/