[Qt-interest] what is this syntax?

[pmqt71]

Hi all,

could you tell me what the following statement means? What is : 4after
window_state definition?

    uint window_state : 4;


I found this syntax in qwidget.h

...
class QWidgetData
{
public:
    WId winid;
    uint widget_attributes;
    Qt::WindowFlags window_flags;
    uint window_state : 4;
    uint focus_policy : 4;
    uint sizehint_forced :1;
    ...



thanks
pm
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