mirror of
https://github.com/python/cpython
synced 2024-07-21 18:25:47 +00:00
0a4dd390bf
- weakref.ref and weakref.ReferenceType will become aliases for each other - weakref.ref will be a modern, new-style class with proper __new__ and __init__ methods - weakref.WeakValueDictionary will have a lighter memory footprint, using a new weakref.ref subclass to associate the key with the value, allowing us to have only a single object of overhead for each dictionary entry (currently, there are 3 objects of overhead per entry: a weakref to the value, a weakref to the dictionary, and a function object used as a weakref callback; the weakref to the dictionary could be avoided without this change) - a new macro, PyWeakref_CheckRefExact(), will be added - PyWeakref_CheckRef() will check for subclasses of weakref.ref This closes SF patch #983019.
56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/* Weak references objects for Python. */
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#ifndef Py_WEAKREFOBJECT_H
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#define Py_WEAKREFOBJECT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct _PyWeakReference PyWeakReference;
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struct _PyWeakReference {
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PyObject_HEAD
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PyObject *wr_object;
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PyObject *wr_callback;
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long hash;
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PyWeakReference *wr_prev;
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PyWeakReference *wr_next;
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};
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PyAPI_DATA(PyTypeObject) _PyWeakref_RefType;
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PyAPI_DATA(PyTypeObject) _PyWeakref_ProxyType;
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PyAPI_DATA(PyTypeObject) _PyWeakref_CallableProxyType;
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#define PyWeakref_CheckRef(op) PyObject_TypeCheck(op, &_PyWeakref_RefType)
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#define PyWeakref_CheckRefExact(op) \
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((op)->ob_type == &_PyWeakref_RefType)
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#define PyWeakref_CheckProxy(op) \
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(((op)->ob_type == &_PyWeakref_ProxyType) || \
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((op)->ob_type == &_PyWeakref_CallableProxyType))
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/* This macro calls PyWeakref_CheckRef() last since that can involve a
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function call; this makes it more likely that the function call
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will be avoided. */
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#define PyWeakref_Check(op) \
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(PyWeakref_CheckRef(op) || PyWeakref_CheckProxy(op))
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PyAPI_FUNC(PyObject *) PyWeakref_NewRef(PyObject *ob,
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PyObject *callback);
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PyAPI_FUNC(PyObject *) PyWeakref_NewProxy(PyObject *ob,
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PyObject *callback);
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PyAPI_FUNC(PyObject *) PyWeakref_GetObject(PyObject *ref);
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PyAPI_FUNC(long) _PyWeakref_GetWeakrefCount(PyWeakReference *head);
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PyAPI_FUNC(void) _PyWeakref_ClearRef(PyWeakReference *self);
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#define PyWeakref_GET_OBJECT(ref) (((PyWeakReference *)(ref))->wr_object)
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_WEAKREFOBJECT_H */
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