1from cpython.ref cimport PyObject
2
3cdef extern from "Python.h":
4
5    bint PyWeakref_Check(object ob)
6    # Return true if ob is either a reference or proxy object.
7
8    bint PyWeakref_CheckRef(object ob)
9    # Return true if ob is a reference object.
10
11    bint PyWeakref_CheckProxy(ob)
12    # Return true if *ob* is a proxy object.
13
14    object PyWeakref_NewRef(object ob, object callback)
15    # Return a weak reference object for the object ob.  This will
16    # always return a new reference, but is not guaranteed to create a
17    # new object; an existing reference object may be returned.  The
18    # second parameter, callback, can be a callable object that
19    # receives notification when ob is garbage collected; it should
20    # accept a single parameter, which will be the weak reference
21    # object itself. callback may also be None or NULL.  If ob is not
22    # a weakly-referencable object, or if callback is not callable,
23    # None, or NULL, this will return NULL and raise TypeError.
24
25    object PyWeakref_NewProxy(object ob, object callback)
26    # Return a weak reference proxy object for the object ob.  This
27    # will always return a new reference, but is not guaranteed to
28    # create a new object; an existing proxy object may be returned.
29    # The second parameter, callback, can be a callable object that
30    # receives notification when ob is garbage collected; it should
31    # accept a single parameter, which will be the weak reference
32    # object itself. callback may also be None or NULL.  If ob is not
33    # a weakly-referencable object, or if callback is not callable,
34    # None, or NULL, this will return NULL and raise TypeError.
35
36    PyObject* PyWeakref_GetObject(object ref)
37    # Return the referenced object from a weak reference, ref.  If the
38    # referent is no longer live, returns None.
39
40    PyObject* PyWeakref_GET_OBJECT(object ref)
41    # Similar to PyWeakref_GetObject, but implemented as a macro that
42    # does no error checking.
43