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| 1 | /* Weak references objects for Python. */ | ||
| 2 | |||
| 3 | #ifndef Py_WEAKREFOBJECT_H | ||
| 4 | #define Py_WEAKREFOBJECT_H | ||
| 5 | #ifdef __cplusplus | ||
| 6 | extern "C" { | ||
| 7 | #endif | ||
| 8 | |||
| 9 | |||
| 10 | typedef struct _PyWeakReference PyWeakReference; | ||
| 11 | |||
| 12 | /* PyWeakReference is the base struct for the Python ReferenceType, ProxyType, | ||
| 13 | * and CallableProxyType. | ||
| 14 | */ | ||
| 15 | struct _PyWeakReference { | ||
| 16 | PyObject_HEAD | ||
| 17 | |||
| 18 | /* The object to which this is a weak reference, or Py_None if none. | ||
| 19 | * Note that this is a stealth reference: wr_object's refcount is | ||
| 20 | * not incremented to reflect this pointer. | ||
| 21 | */ | ||
| 22 | PyObject *wr_object; | ||
| 23 | |||
| 24 | /* A callable to invoke when wr_object dies, or NULL if none. */ | ||
| 25 | PyObject *wr_callback; | ||
| 26 | |||
| 27 | /* A cache for wr_object's hash code. As usual for hashes, this is -1 | ||
| 28 | * if the hash code isn't known yet. | ||
| 29 | */ | ||
| 30 | long hash; | ||
| 31 | |||
| 32 | /* If wr_object is weakly referenced, wr_object has a doubly-linked NULL- | ||
| 33 | * terminated list of weak references to it. These are the list pointers. | ||
| 34 | * If wr_object goes away, wr_object is set to Py_None, and these pointers | ||
| 35 | * have no meaning then. | ||
| 36 | */ | ||
| 37 | PyWeakReference *wr_prev; | ||
| 38 | PyWeakReference *wr_next; | ||
| 39 | }; | ||
| 40 | |||
| 41 | PyAPI_DATA(PyTypeObject) _PyWeakref_RefType; | ||
| 42 | PyAPI_DATA(PyTypeObject) _PyWeakref_ProxyType; | ||
| 43 | PyAPI_DATA(PyTypeObject) _PyWeakref_CallableProxyType; | ||
| 44 | |||
| 45 | #define PyWeakref_CheckRef(op) PyObject_TypeCheck(op, &_PyWeakref_RefType) | ||
| 46 | #define PyWeakref_CheckRefExact(op) \ | ||
| 47 | ((op)->ob_type == &_PyWeakref_RefType) | ||
| 48 | #define PyWeakref_CheckProxy(op) \ | ||
| 49 | (((op)->ob_type == &_PyWeakref_ProxyType) || \ | ||
| 50 | ((op)->ob_type == &_PyWeakref_CallableProxyType)) | ||
| 51 | |||
| 52 | /* This macro calls PyWeakref_CheckRef() last since that can involve a | ||
| 53 | function call; this makes it more likely that the function call | ||
| 54 | will be avoided. */ | ||
| 55 | #define PyWeakref_Check(op) \ | ||
| 56 | (PyWeakref_CheckRef(op) || PyWeakref_CheckProxy(op)) | ||
| 57 | |||
| 58 | |||
| 59 | PyAPI_FUNC(PyObject *) PyWeakref_NewRef(PyObject *ob, | ||
| 60 | PyObject *callback); | ||
| 61 | PyAPI_FUNC(PyObject *) PyWeakref_NewProxy(PyObject *ob, | ||
| 62 | PyObject *callback); | ||
| 63 | PyAPI_FUNC(PyObject *) PyWeakref_GetObject(PyObject *ref); | ||
| 64 | |||
| 65 | PyAPI_FUNC(Py_ssize_t) _PyWeakref_GetWeakrefCount(PyWeakReference *head); | ||
| 66 | |||
| 67 | PyAPI_FUNC(void) _PyWeakref_ClearRef(PyWeakReference *self); | ||
| 68 | |||
| 69 | #define PyWeakref_GET_OBJECT(ref) (((PyWeakReference *)(ref))->wr_object) | ||
| 70 | |||
| 71 | |||
| 72 | #ifdef __cplusplus | ||
| 73 | } | ||
| 74 | #endif | ||
| 75 | #endif /* !Py_WEAKREFOBJECT_H */ | ||