test_operator_overloading.py revision 12391:ceeca8b41e4b 
1import pytest
2from pybind11_tests import operators as m
3from pybind11_tests import ConstructorStats
4
5
6def test_operator_overloading():
7    v1 = m.Vector2(1, 2)
8    v2 = m.Vector(3, -1)
9    assert str(v1) == "[1.000000, 2.000000]"
10    assert str(v2) == "[3.000000, -1.000000]"
11
12    assert str(v1 + v2) == "[4.000000, 1.000000]"
13    assert str(v1 - v2) == "[-2.000000, 3.000000]"
14    assert str(v1 - 8) == "[-7.000000, -6.000000]"
15    assert str(v1 + 8) == "[9.000000, 10.000000]"
16    assert str(v1 * 8) == "[8.000000, 16.000000]"
17    assert str(v1 / 8) == "[0.125000, 0.250000]"
18    assert str(8 - v1) == "[7.000000, 6.000000]"
19    assert str(8 + v1) == "[9.000000, 10.000000]"
20    assert str(8 * v1) == "[8.000000, 16.000000]"
21    assert str(8 / v1) == "[8.000000, 4.000000]"
22    assert str(v1 * v2) == "[3.000000, -2.000000]"
23    assert str(v2 / v1) == "[3.000000, -0.500000]"
24
25    v1 += 2 * v2
26    assert str(v1) == "[7.000000, 0.000000]"
27    v1 -= v2
28    assert str(v1) == "[4.000000, 1.000000]"
29    v1 *= 2
30    assert str(v1) == "[8.000000, 2.000000]"
31    v1 /= 16
32    assert str(v1) == "[0.500000, 0.125000]"
33    v1 *= v2
34    assert str(v1) == "[1.500000, -0.125000]"
35    v2 /= v1
36    assert str(v2) == "[2.000000, 8.000000]"
37
38    assert hash(v1) == 4
39
40    cstats = ConstructorStats.get(m.Vector2)
41    assert cstats.alive() == 2
42    del v1
43    assert cstats.alive() == 1
44    del v2
45    assert cstats.alive() == 0
46    assert cstats.values() == ['[1.000000, 2.000000]', '[3.000000, -1.000000]',
47                               '[4.000000, 1.000000]', '[-2.000000, 3.000000]',
48                               '[-7.000000, -6.000000]', '[9.000000, 10.000000]',
49                               '[8.000000, 16.000000]', '[0.125000, 0.250000]',
50                               '[7.000000, 6.000000]', '[9.000000, 10.000000]',
51                               '[8.000000, 16.000000]', '[8.000000, 4.000000]',
52                               '[3.000000, -2.000000]', '[3.000000, -0.500000]',
53                               '[6.000000, -2.000000]']
54    assert cstats.default_constructions == 0
55    assert cstats.copy_constructions == 0
56    assert cstats.move_constructions >= 10
57    assert cstats.copy_assignments == 0
58    assert cstats.move_assignments == 0
59
60
61def test_operators_notimplemented():
62    """#393: need to return NotSupported to ensure correct arithmetic operator behavior"""
63
64    c1, c2 = m.C1(), m.C2()
65    assert c1 + c1 == 11
66    assert c2 + c2 == 22
67    assert c2 + c1 == 21
68    assert c1 + c2 == 12
69
70
71def test_nested():
72    """#328: first member in a class can't be used in operators"""
73
74    a = m.NestA()
75    b = m.NestB()
76    c = m.NestC()
77
78    a += 10
79    assert m.get_NestA(a) == 13
80    b.a += 100
81    assert m.get_NestA(b.a) == 103
82    c.b.a += 1000
83    assert m.get_NestA(c.b.a) == 1003
84    b -= 1
85    assert m.get_NestB(b) == 3
86    c.b -= 3
87    assert m.get_NestB(c.b) == 1
88    c *= 7
89    assert m.get_NestC(c) == 35
90
91    abase = a.as_base()
92    assert abase.value == -2
93    a.as_base().value += 44
94    assert abase.value == 42
95    assert c.b.a.as_base().value == -2
96    c.b.a.as_base().value += 44
97    assert c.b.a.as_base().value == 42
98
99    del c
100    pytest.gc_collect()
101    del a  # Should't delete while abase is still alive
102    pytest.gc_collect()
103
104    assert abase.value == 42
105    del abase, b
106    pytest.gc_collect()
107