test_multiple_inheritance.py revision 12037:d28054ac6ec9 
1import pytest
2
3
4def test_multiple_inheritance_cpp():
5    from pybind11_tests import MIType
6
7    mt = MIType(3, 4)
8
9    assert mt.foo() == 3
10    assert mt.bar() == 4
11
12
13def test_multiple_inheritance_mix1():
14    from pybind11_tests import Base2
15
16    class Base1:
17        def __init__(self, i):
18            self.i = i
19
20        def foo(self):
21            return self.i
22
23    class MITypePy(Base1, Base2):
24        def __init__(self, i, j):
25            Base1.__init__(self, i)
26            Base2.__init__(self, j)
27
28    mt = MITypePy(3, 4)
29
30    assert mt.foo() == 3
31    assert mt.bar() == 4
32
33
34def test_multiple_inheritance_mix2():
35    from pybind11_tests import Base1
36
37    class Base2:
38        def __init__(self, i):
39            self.i = i
40
41        def bar(self):
42            return self.i
43
44    class MITypePy(Base1, Base2):
45        def __init__(self, i, j):
46            Base1.__init__(self, i)
47            Base2.__init__(self, j)
48
49    mt = MITypePy(3, 4)
50
51    assert mt.foo() == 3
52    assert mt.bar() == 4
53
54
55def test_multiple_inheritance_error():
56    """Inheriting from multiple C++ bases in Python is not supported"""
57    from pybind11_tests import Base1, Base2
58
59    with pytest.raises(TypeError) as excinfo:
60        # noinspection PyUnusedLocal
61        class MI(Base1, Base2):
62            pass
63    assert "Can't inherit from multiple C++ classes in Python" in str(excinfo.value)
64
65
66def test_multiple_inheritance_virtbase():
67    from pybind11_tests import Base12a, bar_base2a, bar_base2a_sharedptr
68
69    class MITypePy(Base12a):
70        def __init__(self, i, j):
71            Base12a.__init__(self, i, j)
72
73    mt = MITypePy(3, 4)
74    assert mt.bar() == 4
75    assert bar_base2a(mt) == 4
76    assert bar_base2a_sharedptr(mt) == 4
77
78
79def test_mi_static_properties():
80    """Mixing bases with and without static properties should be possible
81     and the result should be independent of base definition order"""
82    from pybind11_tests import mi
83
84    for d in (mi.VanillaStaticMix1(), mi.VanillaStaticMix2()):
85        assert d.vanilla() == "Vanilla"
86        assert d.static_func1() == "WithStatic1"
87        assert d.static_func2() == "WithStatic2"
88        assert d.static_func() == d.__class__.__name__
89
90        mi.WithStatic1.static_value1 = 1
91        mi.WithStatic2.static_value2 = 2
92        assert d.static_value1 == 1
93        assert d.static_value2 == 2
94        assert d.static_value == 12
95
96        d.static_value1 = 0
97        assert d.static_value1 == 0
98        d.static_value2 = 0
99        assert d.static_value2 == 0
100        d.static_value = 0
101        assert d.static_value == 0
102
103
104@pytest.unsupported_on_pypy
105def test_mi_dynamic_attributes():
106    """Mixing bases with and without dynamic attribute support"""
107    from pybind11_tests import mi
108
109    for d in (mi.VanillaDictMix1(), mi.VanillaDictMix2()):
110        d.dynamic = 1
111        assert d.dynamic == 1
112