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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 */ | |