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test_operator_overloading.py
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Sat, Nov 23, 18:43

test_operator_overloading.py
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import pytest
from pybind11_tests import operators as m
from pybind11_tests import ConstructorStats
def test_operator_overloading():
v1 = m.Vector2(1, 2)
v2 = m.Vector(3, -1)
assert str(v1) == "[1.000000, 2.000000]"
assert str(v2) == "[3.000000, -1.000000]"
assert str(v1 + v2) == "[4.000000, 1.000000]"
assert str(v1 - v2) == "[-2.000000, 3.000000]"
assert str(v1 - 8) == "[-7.000000, -6.000000]"
assert str(v1 + 8) == "[9.000000, 10.000000]"
assert str(v1 * 8) == "[8.000000, 16.000000]"
assert str(v1 / 8) == "[0.125000, 0.250000]"
assert str(8 - v1) == "[7.000000, 6.000000]"
assert str(8 + v1) == "[9.000000, 10.000000]"
assert str(8 * v1) == "[8.000000, 16.000000]"
assert str(8 / v1) == "[8.000000, 4.000000]"
assert str(v1 * v2) == "[3.000000, -2.000000]"
assert str(v2 / v1) == "[3.000000, -0.500000]"
v1 += 2 * v2
assert str(v1) == "[7.000000, 0.000000]"
v1 -= v2
assert str(v1) == "[4.000000, 1.000000]"
v1 *= 2
assert str(v1) == "[8.000000, 2.000000]"
v1 /= 16
assert str(v1) == "[0.500000, 0.125000]"
v1 *= v2
assert str(v1) == "[1.500000, -0.125000]"
v2 /= v1
assert str(v2) == "[2.000000, 8.000000]"
assert hash(v1) == 4
cstats = ConstructorStats.get(m.Vector2)
assert cstats.alive() == 2
del v1
assert cstats.alive() == 1
del v2
assert cstats.alive() == 0
assert cstats.values() == ['[1.000000, 2.000000]', '[3.000000, -1.000000]',
'[4.000000, 1.000000]', '[-2.000000, 3.000000]',
'[-7.000000, -6.000000]', '[9.000000, 10.000000]',
'[8.000000, 16.000000]', '[0.125000, 0.250000]',
'[7.000000, 6.000000]', '[9.000000, 10.000000]',
'[8.000000, 16.000000]', '[8.000000, 4.000000]',
'[3.000000, -2.000000]', '[3.000000, -0.500000]',
'[6.000000, -2.000000]']
assert cstats.default_constructions == 0
assert cstats.copy_constructions == 0
assert cstats.move_constructions >= 10
assert cstats.copy_assignments == 0
assert cstats.move_assignments == 0
def test_operators_notimplemented():
"""#393: need to return NotSupported to ensure correct arithmetic operator behavior"""
c1, c2 = m.C1(), m.C2()
assert c1 + c1 == 11
assert c2 + c2 == 22
assert c2 + c1 == 21
assert c1 + c2 == 12
def test_nested():
"""#328: first member in a class can't be used in operators"""
a = m.NestA()
b = m.NestB()
c = m.NestC()
a += 10
assert m.get_NestA(a) == 13
b.a += 100
assert m.get_NestA(b.a) == 103
c.b.a += 1000
assert m.get_NestA(c.b.a) == 1003
b -= 1
assert m.get_NestB(b) == 3
c.b -= 3
assert m.get_NestB(c.b) == 1
c *= 7
assert m.get_NestC(c) == 35
abase = a.as_base()
assert abase.value == -2
a.as_base().value += 44
assert abase.value == 42
assert c.b.a.as_base().value == -2
c.b.a.as_base().value += 44
assert c.b.a.as_base().value == 42
del c
pytest.gc_collect()
del a # Shouldn't delete while abase is still alive
pytest.gc_collect()
assert abase.value == 42
del abase, b
pytest.gc_collect()

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