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#ifndef Py_CPYTHON_WEAKREFOBJECT_H

# error "this header file must not be included directly"

#endif

/* 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.

Py_hash_t 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;

vectorcallfunc vectorcall;

#ifdef Py_GIL_DISABLED

/* Pointer to the lock used when clearing in free-threaded builds.

* Normally this can be derived from wr_object, but in some cases we need

* to lock after wr_object has been set to Py_None.

PyMutex *weakrefs_lock;

#endif

};

PyAPI_FUNC(void) _PyWeakref_ClearRef(PyWeakReference *self);

#define _PyWeakref_CAST(op) \

(assert(PyWeakref_Check(op)), _Py_CAST(PyWeakReference*, (op)))

// Test if a weak reference is dead.

PyAPI_FUNC(int) PyWeakref_IsDead(PyObject *ref);

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