Exemple : la classe Label

typedef struct _LabelClassRec *LabelWidgetClass;

typedef struct _LabelRec *LabelWidget;

LabelClassRec labelClassRec = {{ ...},{ ...},{ ...}};

WidgetClass labelWidgetClass = (WidgetClass) &labelClassRec;

int foo;

} LabelClassPart;

typedef struct _LabelClassRec {

CoreClassPart core_class;

SimpleClassPart simple_class;

LabelClassPart label_class;

} LabelClassRec;

extern LabelClassRec labelClassRec;

typedef struct {

...

} LabelPart;

typedef struct _LabelRec {

CorePart core;

SimplePart simple;

LabelPart label;

} LabelRec;