Cast.h

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#ifndef Cast_H
#define Cast_H
 
/*! @brief Informations de types : static_type_info(T) : renvoie le type_info de la classe T.
 *
 *       ptr_type_info(p) : renvoie le type_info de l'objet pointe par p.
 *       ref_type_info(r) : renvoie le type_info de l'objet r ou de l'alias r
 *       sub_type(T,r) : renvoie 1 ssi r est une instance d'une classe fille de T; 0 sinon.
 *     Les cast securises :
 *       ptr_cast(T,p) : renvoie (T*)(p) ssi *p est d'un sous type de T; 0 sinon.
 *       ref_cast(T,r) : : renvoie (T&)(r) ssi r est d'un sous type de T; 0 sinon.
 *
 */
 
class Type_info;
 
extern int* bad_ref_cast(const Type_info* t1, const Type_info* t2);
 
#define static_type_info(T)                        \
  T::info()
#define ptr_type_info(p)                        \
  ((p)->get_info())
#define ref_type_info(r)                        \
  ((r).get_info())
 
#define same_type(T,r)                                \
  (((r).get_info())->same(T::info()))
#define sub_type(T,r)                                        \
  (T::info_obj.can_cast((r).get_info()) ? 1 : 0)
#define ptr_cast(T,p)                                                \
  (T::info_obj.can_cast((p)->get_info())                        \
   ? 0 :bad_ref_cast(T::info(),(p)->get_info()), (T*)(p))
#define ref_cast(T,r)                                                        \
  (T::info_obj.can_cast((r).get_info())                                        \
   ? 0 :bad_ref_cast(T::info(),(r).get_info()), T::self_cast(r))
#define ref_cast_non_const(T,r)                                        \
  (T::info_obj.can_cast((r).get_info())                                \
   ? 0 :bad_ref_cast(T::info(),(r).get_info()), (T&)(r))
#endif