what is : ?

["이재권" <nannsae naver com>]

hi everyone
I am a student in learning gtk.
I saw it in /usr/include/gtk/gtktoggle.h

struct _GtkToggleButton
{
  GtkButton button;

  guint active : 1;
  guint draw_indicator : 1;

  GdkWindow *event_window;
};
in here,
I wonder how to use : .
I have never seen this operator before.

plase telll me :'s usage and function.
thanks

 

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