<h2>Editing: classobject.h</h2>
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/* Class object interface */

/* Revealing some structures (not for general use) */

#ifndef Py_CLASSOBJECT_H
#define Py_CLASSOBJECT_H
#ifdef __cplusplus
extern &quot;C&quot; {
#endif

typedef struct {
    PyObject_HEAD
    PyObject	*cl_bases;	/* A tuple of class objects */
    PyObject	*cl_dict;	/* A dictionary */
    PyObject	*cl_name;	/* A string */
    /* The following three are functions or NULL */
    PyObject	*cl_getattr;
    PyObject	*cl_setattr;
    PyObject	*cl_delattr;
    PyObject    *cl_weakreflist; /* List of weak references */
} PyClassObject;

typedef struct {
    PyObject_HEAD
    PyClassObject *in_class;	/* The class object */
    PyObject	  *in_dict;	/* A dictionary */
    PyObject	  *in_weakreflist; /* List of weak references */
} PyInstanceObject;

typedef struct {
    PyObject_HEAD
    PyObject *im_func;   /* The callable object implementing the method */
    PyObject *im_self;   /* The instance it is bound to, or NULL */
    PyObject *im_class;  /* The class that asked for the method */
    PyObject *im_weakreflist; /* List of weak references */
} PyMethodObject;

PyAPI_DATA(PyTypeObject) PyClass_Type, PyInstance_Type, PyMethod_Type;

#define PyClass_Check(op) ((op)-&gt;ob_type == &amp;PyClass_Type)
#define PyInstance_Check(op) ((op)-&gt;ob_type == &amp;PyInstance_Type)
#define PyMethod_Check(op) ((op)-&gt;ob_type == &amp;PyMethod_Type)

PyAPI_FUNC(PyObject *) PyClass_New(PyObject *, PyObject *, PyObject *);
PyAPI_FUNC(PyObject *) PyInstance_New(PyObject *, PyObject *,
                                            PyObject *);
PyAPI_FUNC(PyObject *) PyInstance_NewRaw(PyObject *, PyObject *);
PyAPI_FUNC(PyObject *) PyMethod_New(PyObject *, PyObject *, PyObject *);

PyAPI_FUNC(PyObject *) PyMethod_Function(PyObject *);
PyAPI_FUNC(PyObject *) PyMethod_Self(PyObject *);
PyAPI_FUNC(PyObject *) PyMethod_Class(PyObject *);

/* Look up attribute with name (a string) on instance object pinst, using
 * only the instance and base class dicts.  If a descriptor is found in
 * a class dict, the descriptor is returned without calling it.
 * Returns NULL if nothing found, else a borrowed reference to the
 * value associated with name in the dict in which name was found.
 * The point of this routine is that it never calls arbitrary Python
 * code, so is always &quot;safe&quot;:  all it does is dict lookups.  The function
 * can't fail, never sets an exception, and NULL is not an error (it just
 * means &quot;not found&quot;).
 */
PyAPI_FUNC(PyObject *) _PyInstance_Lookup(PyObject *pinst, PyObject *name);

/* Macros for direct access to these values. Type checks are *not*
   done, so use with care. */
#define PyMethod_GET_FUNCTION(meth) \
        (((PyMethodObject *)meth) -&gt; im_func)
#define PyMethod_GET_SELF(meth) \
	(((PyMethodObject *)meth) -&gt; im_self)
#define PyMethod_GET_CLASS(meth) \
	(((PyMethodObject *)meth) -&gt; im_class)

PyAPI_FUNC(int) PyClass_IsSubclass(PyObject *, PyObject *);

PyAPI_FUNC(int) PyMethod_ClearFreeList(void);

#ifdef __cplusplus
}
#endif
#endif /* !Py_CLASSOBJECT_H */
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