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      1 
      2 /* Class object interface */
      3 
      4 /* Revealing some structures (not for general use) */
      5 
      6 #ifndef Py_CLASSOBJECT_H
      7 #define Py_CLASSOBJECT_H
      8 #ifdef __cplusplus
      9 extern "C" {
     10 #endif
     11 
     12 typedef struct {
     13     PyObject_HEAD
     14     PyObject	*cl_bases;	/* A tuple of class objects */
     15     PyObject	*cl_dict;	/* A dictionary */
     16     PyObject	*cl_name;	/* A string */
     17     /* The following three are functions or NULL */
     18     PyObject	*cl_getattr;
     19     PyObject	*cl_setattr;
     20     PyObject	*cl_delattr;
     21     PyObject    *cl_weakreflist; /* List of weak references */
     22 } PyClassObject;
     23 
     24 typedef struct {
     25     PyObject_HEAD
     26     PyClassObject *in_class;	/* The class object */
     27     PyObject	  *in_dict;	/* A dictionary */
     28     PyObject	  *in_weakreflist; /* List of weak references */
     29 } PyInstanceObject;
     30 
     31 typedef struct {
     32     PyObject_HEAD
     33     PyObject *im_func;   /* The callable object implementing the method */
     34     PyObject *im_self;   /* The instance it is bound to, or NULL */
     35     PyObject *im_class;  /* The class that asked for the method */
     36     PyObject *im_weakreflist; /* List of weak references */
     37 } PyMethodObject;
     38 
     39 PyAPI_DATA(PyTypeObject) PyClass_Type, PyInstance_Type, PyMethod_Type;
     40 
     41 #define PyClass_Check(op) ((op)->ob_type == &PyClass_Type)
     42 #define PyInstance_Check(op) ((op)->ob_type == &PyInstance_Type)
     43 #define PyMethod_Check(op) ((op)->ob_type == &PyMethod_Type)
     44 
     45 PyAPI_FUNC(PyObject *) PyClass_New(PyObject *, PyObject *, PyObject *);
     46 PyAPI_FUNC(PyObject *) PyInstance_New(PyObject *, PyObject *,
     47                                             PyObject *);
     48 PyAPI_FUNC(PyObject *) PyInstance_NewRaw(PyObject *, PyObject *);
     49 PyAPI_FUNC(PyObject *) PyMethod_New(PyObject *, PyObject *, PyObject *);
     50 
     51 PyAPI_FUNC(PyObject *) PyMethod_Function(PyObject *);
     52 PyAPI_FUNC(PyObject *) PyMethod_Self(PyObject *);
     53 PyAPI_FUNC(PyObject *) PyMethod_Class(PyObject *);
     54 
     55 /* Look up attribute with name (a string) on instance object pinst, using
     56  * only the instance and base class dicts.  If a descriptor is found in
     57  * a class dict, the descriptor is returned without calling it.
     58  * Returns NULL if nothing found, else a borrowed reference to the
     59  * value associated with name in the dict in which name was found.
     60  * The point of this routine is that it never calls arbitrary Python
     61  * code, so is always "safe":  all it does is dict lookups.  The function
     62  * can't fail, never sets an exception, and NULL is not an error (it just
     63  * means "not found").
     64  */
     65 PyAPI_FUNC(PyObject *) _PyInstance_Lookup(PyObject *pinst, PyObject *name);
     66 
     67 /* Macros for direct access to these values. Type checks are *not*
     68    done, so use with care. */
     69 #define PyMethod_GET_FUNCTION(meth) \
     70         (((PyMethodObject *)meth) -> im_func)
     71 #define PyMethod_GET_SELF(meth) \
     72 	(((PyMethodObject *)meth) -> im_self)
     73 #define PyMethod_GET_CLASS(meth) \
     74 	(((PyMethodObject *)meth) -> im_class)
     75 
     76 PyAPI_FUNC(int) PyClass_IsSubclass(PyObject *, PyObject *);
     77 
     78 PyAPI_FUNC(int) PyMethod_ClearFreeList(void);
     79 
     80 #ifdef __cplusplus
     81 }
     82 #endif
     83 #endif /* !Py_CLASSOBJECT_H */
     84