pybind11/tests/test_multiple_inheritance.py

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import pytest
from pybind11_tests import ConstructorStats
def test_multiple_inheritance_cpp():
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from pybind11_tests import MIType
mt = MIType(3, 4)
assert mt.foo() == 3
assert mt.bar() == 4
def test_multiple_inheritance_mix1():
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from pybind11_tests import Base2
class Base1:
def __init__(self, i):
self.i = i
def foo(self):
return self.i
class MITypePy(Base1, Base2):
def __init__(self, i, j):
Base1.__init__(self, i)
Base2.__init__(self, j)
mt = MITypePy(3, 4)
assert mt.foo() == 3
assert mt.bar() == 4
def test_multiple_inheritance_mix2():
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from pybind11_tests import Base1
class Base2:
def __init__(self, i):
self.i = i
def bar(self):
return self.i
class MITypePy(Base1, Base2):
def __init__(self, i, j):
Base1.__init__(self, i)
Base2.__init__(self, j)
mt = MITypePy(3, 4)
assert mt.foo() == 3
assert mt.bar() == 4
def test_multiple_inheritance_error():
"""Inheriting from multiple C++ bases in Python is not supported"""
from pybind11_tests import Base1, Base2
with pytest.raises(TypeError) as excinfo:
# noinspection PyUnusedLocal
class MI(Base1, Base2):
pass
assert "Can't inherit from multiple C++ classes in Python" in str(excinfo.value)
def test_multiple_inheritance_virtbase():
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from pybind11_tests import Base12a, bar_base2a, bar_base2a_sharedptr
class MITypePy(Base12a):
def __init__(self, i, j):
Base12a.__init__(self, i, j)
mt = MITypePy(3, 4)
assert mt.bar() == 4
assert bar_base2a(mt) == 4
assert bar_base2a_sharedptr(mt) == 4
def test_mi_static_properties():
"""Mixing bases with and without static properties should be possible
and the result should be independent of base definition order"""
from pybind11_tests import mi
for d in (mi.VanillaStaticMix1(), mi.VanillaStaticMix2()):
assert d.vanilla() == "Vanilla"
assert d.static_func1() == "WithStatic1"
assert d.static_func2() == "WithStatic2"
assert d.static_func() == d.__class__.__name__
mi.WithStatic1.static_value1 = 1
mi.WithStatic2.static_value2 = 2
assert d.static_value1 == 1
assert d.static_value2 == 2
assert d.static_value == 12
d.static_value1 = 0
assert d.static_value1 == 0
d.static_value2 = 0
assert d.static_value2 == 0
d.static_value = 0
assert d.static_value == 0
@pytest.unsupported_on_pypy
def test_mi_dynamic_attributes():
"""Mixing bases with and without dynamic attribute support"""
from pybind11_tests import mi
for d in (mi.VanillaDictMix1(), mi.VanillaDictMix2()):
d.dynamic = 1
assert d.dynamic == 1
def test_mi_unaligned_base():
"""Returning an offset (non-first MI) base class pointer should recognize the instance"""
from pybind11_tests import I801C, I801D, i801b1_c, i801b2_c, i801b1_d, i801b2_d
n_inst = ConstructorStats.detail_reg_inst()
c = I801C()
d = I801D()
# + 4 below because we have the two instances, and each instance has offset base I801B2
assert ConstructorStats.detail_reg_inst() == n_inst + 4
b1c = i801b1_c(c)
assert b1c is c
b2c = i801b2_c(c)
assert b2c is c
b1d = i801b1_d(d)
assert b1d is d
b2d = i801b2_d(d)
assert b2d is d
assert ConstructorStats.detail_reg_inst() == n_inst + 4 # no extra instances
del c, b1c, b2c
assert ConstructorStats.detail_reg_inst() == n_inst + 2
del d, b1d, b2d
assert ConstructorStats.detail_reg_inst() == n_inst
def test_mi_base_return():
"""Tests returning an offset (non-first MI) base class pointer to a derived instance"""
from pybind11_tests import (I801B2, I801C, I801D, i801c_b1, i801c_b2, i801d_b1, i801d_b2,
i801e_c, i801e_b2)
n_inst = ConstructorStats.detail_reg_inst()
c1 = i801c_b1()
assert type(c1) is I801C
assert c1.a == 1
assert c1.b == 2
d1 = i801d_b1()
assert type(d1) is I801D
assert d1.a == 1
assert d1.b == 2
assert ConstructorStats.detail_reg_inst() == n_inst + 4
c2 = i801c_b2()
assert type(c2) is I801C
assert c2.a == 1
assert c2.b == 2
d2 = i801d_b2()
assert type(d2) is I801D
assert d2.a == 1
assert d2.b == 2
assert ConstructorStats.detail_reg_inst() == n_inst + 8
del c2
assert ConstructorStats.detail_reg_inst() == n_inst + 6
del c1, d1, d2
assert ConstructorStats.detail_reg_inst() == n_inst
# Returning an unregistered derived type with a registered base; we won't
# pick up the derived type, obviously, but should still work (as an object
# of whatever type was returned).
e1 = i801e_c()
assert type(e1) is I801C
assert e1.a == 1
assert e1.b == 2
e2 = i801e_b2()
assert type(e2) is I801B2
assert e2.b == 2