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/* Weak references objects for Python. */
#ifndef Py_WEAKREFOBJECT_H
#define Py_WEAKREFOBJECT_H
#ifdef __cplusplus
extern "C" { #endif
typedef struct _PyWeakReference PyWeakReference;
/* PyWeakReference is the base struct for the Python ReferenceType, ProxyType,
* and CallableProxyType. */ struct _PyWeakReference { PyObject_HEAD
/* The object to which this is a weak reference, or Py_None if none.
* Note that this is a stealth reference: wr_object's refcount is * not incremented to reflect this pointer. */ PyObject *wr_object;
/* A callable to invoke when wr_object dies, or NULL if none. */ PyObject *wr_callback;
/* A cache for wr_object's hash code. As usual for hashes, this is -1
* if the hash code isn't known yet. */ long hash;
/* If wr_object is weakly referenced, wr_object has a doubly-linked NULL-
* terminated list of weak references to it. These are the list pointers. * If wr_object goes away, wr_object is set to Py_None, and these pointers * have no meaning then. */ PyWeakReference *wr_prev; PyWeakReference *wr_next; };
PyAPI_DATA(PyTypeObject) _PyWeakref_RefType; PyAPI_DATA(PyTypeObject) _PyWeakref_ProxyType; PyAPI_DATA(PyTypeObject) _PyWeakref_CallableProxyType;
#define PyWeakref_CheckRef(op) PyObject_TypeCheck(op, &_PyWeakref_RefType)
#define PyWeakref_CheckRefExact(op) \
((op)->ob_type == &_PyWeakref_RefType) #define PyWeakref_CheckProxy(op) \
(((op)->ob_type == &_PyWeakref_ProxyType) || \ ((op)->ob_type == &_PyWeakref_CallableProxyType))
/* This macro calls PyWeakref_CheckRef() last since that can involve a
function call; this makes it more likely that the function call will be avoided. */ #define PyWeakref_Check(op) \
(PyWeakref_CheckRef(op) || PyWeakref_CheckProxy(op))
PyAPI_FUNC(PyObject *) PyWeakref_NewRef(PyObject *ob, PyObject *callback); PyAPI_FUNC(PyObject *) PyWeakref_NewProxy(PyObject *ob, PyObject *callback); PyAPI_FUNC(PyObject *) PyWeakref_GetObject(PyObject *ref);
PyAPI_FUNC(Py_ssize_t) _PyWeakref_GetWeakrefCount(PyWeakReference *head);
PyAPI_FUNC(void) _PyWeakref_ClearRef(PyWeakReference *self);
#define PyWeakref_GET_OBJECT(ref) (((PyWeakReference *)(ref))->wr_object)
#ifdef __cplusplus
} #endif
#endif /* !Py_WEAKREFOBJECT_H */
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