deimos.python.weakrefobject source code

1 /**
2   Mirror _weakrefobject.h
3 
4 Weak references objects for Python. 
5   */
6 module deimos.python.weakrefobject;
7 
8 import deimos.python.pyport;
9 import deimos.python.object;
10 
11 extern(C):
12 // Python-header-file: Include/weakrefobject.h:
13 
14 /** PyWeakReference is the base struct for the Python ReferenceType, ProxyType,
15  * and CallableProxyType.
16  *
17  * subclass of PyObject
18  */
19 struct PyWeakReference {
20     mixin PyObject_HEAD;
21 
22     /**The object to which this is a weak reference, or Py_None if none.
23      * Note that this is a stealth reference:  wr_object's refcount is
24      * not incremented to reflect this pointer.
25      */
26     PyObject* wr_object;
27     /** A callable to invoke when wr_object dies, or NULL if none. */
28     PyObject* wr_callback;
29     /** A cache for wr_object's hash code.  As usual for hashes, this is -1
30      * if the hash code isn't known yet.
31      */
32     version(Python_3_2_Or_Later) {
33         Py_hash_t hash;
34     }else{
35         C_long hash;
36     }
37     /** If wr_object is weakly referenced, wr_object has a doubly-linked NULL-
38      * terminated list of weak references to it.  These are the list pointers.
39      * If wr_object goes away, wr_object is set to Py_None, and these pointers
40      * have no meaning then.
41      */
42     PyWeakReference* wr_prev;
43     /// ditto
44     PyWeakReference* wr_next;
45 }
46 
47 /// _
48 mixin(PyAPI_DATA!"PyTypeObject _PyWeakref_RefType");
49 /// _
50 mixin(PyAPI_DATA!"PyTypeObject _PyWeakref_ProxyType");
51 /// _
52 mixin(PyAPI_DATA!"PyTypeObject _PyWeakref_CallableProxyType");
53 
54 // D translations of C macros:
55 /// _
56 int PyWeakref_CheckRef()(PyObject* op) {
57     return PyObject_TypeCheck(op, &_PyWeakref_RefType);
58 }
59 /// _
60 int PyWeakref_CheckRefExact()(PyObject* op) {
61     return Py_TYPE(op) == &_PyWeakref_RefType;
62 }
63 /// _
64 int PyWeakref_CheckProxy()(PyObject* op) {
65     return Py_TYPE(op) == &_PyWeakref_ProxyType
66         || Py_TYPE(op) == &_PyWeakref_CallableProxyType;
67 }
68 /** This macro calls PyWeakref_CheckRef() last since that can involve a
69    function call; this makes it more likely that the function call
70    will be avoided. */
71 int PyWeakref_Check()(PyObject* op) {
72     return PyWeakref_CheckRef(op) || PyWeakref_CheckProxy(op);
73 }
74 
75 /// _
76 PyObject* PyWeakref_NewRef(PyObject* ob, PyObject* callback);
77 /// _
78 PyObject* PyWeakref_NewProxy(PyObject* ob, PyObject* callback);
79 /// _
80 PyObject_BorrowedRef* PyWeakref_GetObject(PyObject* _ref);
81 
82 version(Python_2_5_Or_Later){
83     /// _
84     Py_ssize_t _PyWeakref_GetWeakrefCount(PyWeakReference* head);
85 }else{
86     /// _
87     C_long _PyWeakref_GetWeakrefCount(PyWeakReference *head);
88 }
89 /// _
90 void _PyWeakref_ClearRef(PyWeakReference *self);
91 
92 /// _
93 PyObject_BorrowedRef* PyWeakref_GET_OBJECT()(PyObject* _ref) {
94     return (cast(PyWeakReference *) _ref).wr_object;
95 }
96