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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(long) _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 */