manual.c

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typedef struct Object Object;   
typedef struct Vehicle Vehicle; 
typedef struct Car Car;         
typedef struct Truck Truck;     
 
struct Object
{
  int ref;    
};
 
 
static Object * objRef(Object *obj);
 
 
static Object * objUnref(Object *obj);
 
 
struct Vehicle
{
  Object base;    
};
 
 
void vehicleStart(Vehicle *obj);
 
 
void vehicleStop(Vehicle *obj);
 
 
struct Car
{
  Vehicle base;    
};
 
 
struct Truck
{
  Vehicle base;    
};
 
 
int main(void)
{
  Car c;
  vehicleStart((Vehicle*) &c);
}