File: test_incomplete.py

package info (click to toggle)
python3.4 3.4.2-1
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-kfreebsd
  • size: 80,356 kB
  • ctags: 100,540
  • sloc: python: 459,698; ansic: 381,519; sh: 17,599; asm: 14,322; makefile: 2,209; objc: 761; lisp: 502; exp: 499; cpp: 353; pascal: 80; xml: 73; csh: 21
file content (42 lines) | stat: -rw-r--r-- 1,023 bytes parent folder | download | duplicates (12)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
import unittest
from ctypes import *

################################################################
#
# The incomplete pointer example from the tutorial
#

class MyTestCase(unittest.TestCase):

    def test_incomplete_example(self):
        lpcell = POINTER("cell")
        class cell(Structure):
            _fields_ = [("name", c_char_p),
                        ("next", lpcell)]

        SetPointerType(lpcell, cell)

        c1 = cell()
        c1.name = b"foo"
        c2 = cell()
        c2.name = b"bar"

        c1.next = pointer(c2)
        c2.next = pointer(c1)

        p = c1

        result = []
        for i in range(8):
            result.append(p.name)
            p = p.next[0]
        self.assertEqual(result, [b"foo", b"bar"] * 4)

        # to not leak references, we must clean _pointer_type_cache
        from ctypes import _pointer_type_cache
        del _pointer_type_cache[cell]

################################################################

if __name__ == '__main__':
    unittest.main()