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#define IS_VOLUME_WIDGET_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), VOLUME_WIDGET_TYPE))
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#define VOLUME_WIDGET_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), VOLUME_WIDGET_TYPE, VolumeWidgetClass))
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struct _VolumeWidgetClass {
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GObjectClass parent_class;
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GType volume_widget_get_type (void) G_GNUC_CONST;