1#ifndef Py_CPYTHON_LISTOBJECT_H
2#  error "this header file must not be included directly"
3#endif
4
5typedef struct {
6    PyObject_VAR_HEAD
7    /* Vector of pointers to list elements.  list[0] is ob_item[0], etc. */
8    PyObject **ob_item;
9
10    /* ob_item contains space for 'allocated' elements.  The number
11     * currently in use is ob_size.
12     * Invariants:
13     *     0 <= ob_size <= allocated
14     *     len(list) == ob_size
15     *     ob_item == NULL implies ob_size == allocated == 0
16     * list.sort() temporarily sets allocated to -1 to detect mutations.
17     *
18     * Items must normally not be NULL, except during construction when
19     * the list is not yet visible outside the function that builds it.
20     */
21    Py_ssize_t allocated;
22} PyListObject;
23
24PyAPI_FUNC(PyObject *) _PyList_Extend(PyListObject *, PyObject *);
25PyAPI_FUNC(void) _PyList_DebugMallocStats(FILE *out);
26
27/* Cast argument to PyListObject* type. */
28#define _PyList_CAST(op) \
29    (assert(PyList_Check(op)), _Py_CAST(PyListObject*, (op)))
30
31// Macros and static inline functions, trading safety for speed
32
33static inline Py_ssize_t PyList_GET_SIZE(PyObject *op) {
34    PyListObject *list = _PyList_CAST(op);
35    return Py_SIZE(list);
36}
37#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < 0x030b0000
38#  define PyList_GET_SIZE(op) PyList_GET_SIZE(_PyObject_CAST(op))
39#endif
40
41#define PyList_GET_ITEM(op, index) (_PyList_CAST(op)->ob_item[index])
42
43static inline void
44PyList_SET_ITEM(PyObject *op, Py_ssize_t index, PyObject *value) {
45    PyListObject *list = _PyList_CAST(op);
46    list->ob_item[index] = value;
47}
48#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < 0x030b0000
49#define PyList_SET_ITEM(op, index, value) \
50    PyList_SET_ITEM(_PyObject_CAST(op), index, _PyObject_CAST(value))
51#endif
52