doc_src_groups.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
void QPen::setStyle(Qt::PenStyle style)
{
    detach();           // detach from common data
    d->style = style;   // set the style member
}
 
void QPen::detach()
{
    if (d->ref != 1) {
        ...             // perform a deep copy
    }
}
 
 
QPixmap p1, p2;
p1.load("image.bmp");
p2 = p1;                        // p1 and p2 share data
 
QPainter paint;
paint.begin(&p2);               // cuts p2 loose from p1
paint.drawText(0,50, "Hi");
paint.end();