cpython/Include/cellobject.h

/* Cell object interface */
#ifndef Py_LIMITED_API
#ifndef Py_CELLOBJECT_H
#define Py_CELLOBJECT_H
#ifdef __cplusplus
extern "C" {
#endif

typedef struct {
    PyObject_HEAD
    PyObject *ob_ref;       /* Content of the cell or NULL when empty */
} PyCellObject;

PyAPI_DATA(PyTypeObject) PyCell_Type;

#define PyCell_Check(op) Py_IS_TYPE(op, &PyCell_Type)

PyAPI_FUNC(PyObject *) PyCell_New(PyObject *);
PyAPI_FUNC(PyObject *) PyCell_Get(PyObject *);
PyAPI_FUNC(int) PyCell_Set(PyObject *, PyObject *);

#define PyCell_GET(op) (((PyCellObject *)(op))->ob_ref)
#define PyCell_SET(op, v) ((void)(((PyCellObject *)(op))->ob_ref = v))

#ifdef __cplusplus
}
#endif
#endif /* !Py_TUPLEOBJECT_H */
#endif /* Py_LIMITED_API */