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test_virtual_functions.py
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Mon, Feb 17, 12:06

test_virtual_functions.py
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import pytest
from pybind11_tests import virtual_functions as m
from pybind11_tests import ConstructorStats
def test_override(capture, msg):
class ExtendedExampleVirt(m.ExampleVirt):
def __init__(self, state):
super(ExtendedExampleVirt, self).__init__(state + 1)
self.data = "Hello world"
def run(self, value):
print('ExtendedExampleVirt::run(%i), calling parent..' % value)
return super(ExtendedExampleVirt, self).run(value + 1)
def run_bool(self):
print('ExtendedExampleVirt::run_bool()')
return False
def get_string1(self):
return "override1"
def pure_virtual(self):
print('ExtendedExampleVirt::pure_virtual(): %s' % self.data)
class ExtendedExampleVirt2(ExtendedExampleVirt):
def __init__(self, state):
super(ExtendedExampleVirt2, self).__init__(state + 1)
def get_string2(self):
return "override2"
ex12 = m.ExampleVirt(10)
with capture:
assert m.runExampleVirt(ex12, 20) == 30
assert capture == """
Original implementation of ExampleVirt::run(state=10, value=20, str1=default1, str2=default2)
""" # noqa: E501 line too long
with pytest.raises(RuntimeError) as excinfo:
m.runExampleVirtVirtual(ex12)
assert msg(excinfo.value) == 'Tried to call pure virtual function "ExampleVirt::pure_virtual"'
ex12p = ExtendedExampleVirt(10)
with capture:
assert m.runExampleVirt(ex12p, 20) == 32
assert capture == """
ExtendedExampleVirt::run(20), calling parent..
Original implementation of ExampleVirt::run(state=11, value=21, str1=override1, str2=default2)
""" # noqa: E501 line too long
with capture:
assert m.runExampleVirtBool(ex12p) is False
assert capture == "ExtendedExampleVirt::run_bool()"
with capture:
m.runExampleVirtVirtual(ex12p)
assert capture == "ExtendedExampleVirt::pure_virtual(): Hello world"
ex12p2 = ExtendedExampleVirt2(15)
with capture:
assert m.runExampleVirt(ex12p2, 50) == 68
assert capture == """
ExtendedExampleVirt::run(50), calling parent..
Original implementation of ExampleVirt::run(state=17, value=51, str1=override1, str2=override2)
""" # noqa: E501 line too long
cstats = ConstructorStats.get(m.ExampleVirt)
assert cstats.alive() == 3
del ex12, ex12p, ex12p2
assert cstats.alive() == 0
assert cstats.values() == ['10', '11', '17']
assert cstats.copy_constructions == 0
assert cstats.move_constructions >= 0
def test_alias_delay_initialization1(capture):
"""`A` only initializes its trampoline class when we inherit from it
If we just create and use an A instance directly, the trampoline initialization is
bypassed and we only initialize an A() instead (for performance reasons).
"""
class B(m.A):
def __init__(self):
super(B, self).__init__()
def f(self):
print("In python f()")
# C++ version
with capture:
a = m.A()
m.call_f(a)
del a
pytest.gc_collect()
assert capture == "A.f()"
# Python version
with capture:
b = B()
m.call_f(b)
del b
pytest.gc_collect()
assert capture == """
PyA.PyA()
PyA.f()
In python f()
PyA.~PyA()
"""
def test_alias_delay_initialization2(capture):
"""`A2`, unlike the above, is configured to always initialize the alias
While the extra initialization and extra class layer has small virtual dispatch
performance penalty, it also allows us to do more things with the trampoline
class such as defining local variables and performing construction/destruction.
"""
class B2(m.A2):
def __init__(self):
super(B2, self).__init__()
def f(self):
print("In python B2.f()")
# No python subclass version
with capture:
a2 = m.A2()
m.call_f(a2)
del a2
pytest.gc_collect()
a3 = m.A2(1)
m.call_f(a3)
del a3
pytest.gc_collect()
assert capture == """
PyA2.PyA2()
PyA2.f()
A2.f()
PyA2.~PyA2()
PyA2.PyA2()
PyA2.f()
A2.f()
PyA2.~PyA2()
"""
# Python subclass version
with capture:
b2 = B2()
m.call_f(b2)
del b2
pytest.gc_collect()
assert capture == """
PyA2.PyA2()
PyA2.f()
In python B2.f()
PyA2.~PyA2()
"""
# PyPy: Reference count > 1 causes call with noncopyable instance
# to fail in ncv1.print_nc()
@pytest.unsupported_on_pypy
@pytest.mark.skipif(not hasattr(m, "NCVirt"), reason="NCVirt test broken on ICPC")
def test_move_support():
class NCVirtExt(m.NCVirt):
def get_noncopyable(self, a, b):
# Constructs and returns a new instance:
nc = m.NonCopyable(a * a, b * b)
return nc
def get_movable(self, a, b):
# Return a referenced copy
self.movable = m.Movable(a, b)
return self.movable
class NCVirtExt2(m.NCVirt):
def get_noncopyable(self, a, b):
# Keep a reference: this is going to throw an exception
self.nc = m.NonCopyable(a, b)
return self.nc
def get_movable(self, a, b):
# Return a new instance without storing it
return m.Movable(a, b)
ncv1 = NCVirtExt()
assert ncv1.print_nc(2, 3) == "36"
assert ncv1.print_movable(4, 5) == "9"
ncv2 = NCVirtExt2()
assert ncv2.print_movable(7, 7) == "14"
# Don't check the exception message here because it differs under debug/non-debug mode
with pytest.raises(RuntimeError):
ncv2.print_nc(9, 9)
nc_stats = ConstructorStats.get(m.NonCopyable)
mv_stats = ConstructorStats.get(m.Movable)
assert nc_stats.alive() == 1
assert mv_stats.alive() == 1
del ncv1, ncv2
assert nc_stats.alive() == 0
assert mv_stats.alive() == 0
assert nc_stats.values() == ['4', '9', '9', '9']
assert mv_stats.values() == ['4', '5', '7', '7']
assert nc_stats.copy_constructions == 0
assert mv_stats.copy_constructions == 1
assert nc_stats.move_constructions >= 0
assert mv_stats.move_constructions >= 0
def test_dispatch_issue(msg):
"""#159: virtual function dispatch has problems with similar-named functions"""
class PyClass1(m.DispatchIssue):
def dispatch(self):
return "Yay.."
class PyClass2(m.DispatchIssue):
def dispatch(self):
with pytest.raises(RuntimeError) as excinfo:
super(PyClass2, self).dispatch()
assert msg(excinfo.value) == 'Tried to call pure virtual function "Base::dispatch"'
p = PyClass1()
return m.dispatch_issue_go(p)
b = PyClass2()
assert m.dispatch_issue_go(b) == "Yay.."
def test_override_ref():
"""#392/397: overriding reference-returning functions"""
o = m.OverrideTest("asdf")
# Not allowed (see associated .cpp comment)
# i = o.str_ref()
# assert o.str_ref() == "asdf"
assert o.str_value() == "asdf"
assert o.A_value().value == "hi"
a = o.A_ref()
assert a.value == "hi"
a.value = "bye"
assert a.value == "bye"
def test_inherited_virtuals():
class AR(m.A_Repeat):
def unlucky_number(self):
return 99
class AT(m.A_Tpl):
def unlucky_number(self):
return 999
obj = AR()
assert obj.say_something(3) == "hihihi"
assert obj.unlucky_number() == 99
assert obj.say_everything() == "hi 99"
obj = AT()
assert obj.say_something(3) == "hihihi"
assert obj.unlucky_number() == 999
assert obj.say_everything() == "hi 999"
for obj in [m.B_Repeat(), m.B_Tpl()]:
assert obj.say_something(3) == "B says hi 3 times"
assert obj.unlucky_number() == 13
assert obj.lucky_number() == 7.0
assert obj.say_everything() == "B says hi 1 times 13"
for obj in [m.C_Repeat(), m.C_Tpl()]:
assert obj.say_something(3) == "B says hi 3 times"
assert obj.unlucky_number() == 4444
assert obj.lucky_number() == 888.0
assert obj.say_everything() == "B says hi 1 times 4444"
class CR(m.C_Repeat):
def lucky_number(self):
return m.C_Repeat.lucky_number(self) + 1.25
obj = CR()
assert obj.say_something(3) == "B says hi 3 times"
assert obj.unlucky_number() == 4444
assert obj.lucky_number() == 889.25
assert obj.say_everything() == "B says hi 1 times 4444"
class CT(m.C_Tpl):
pass
obj = CT()
assert obj.say_something(3) == "B says hi 3 times"
assert obj.unlucky_number() == 4444
assert obj.lucky_number() == 888.0
assert obj.say_everything() == "B says hi 1 times 4444"
class CCR(CR):
def lucky_number(self):
return CR.lucky_number(self) * 10
obj = CCR()
assert obj.say_something(3) == "B says hi 3 times"
assert obj.unlucky_number() == 4444
assert obj.lucky_number() == 8892.5
assert obj.say_everything() == "B says hi 1 times 4444"
class CCT(CT):
def lucky_number(self):
return CT.lucky_number(self) * 1000
obj = CCT()
assert obj.say_something(3) == "B says hi 3 times"
assert obj.unlucky_number() == 4444
assert obj.lucky_number() == 888000.0
assert obj.say_everything() == "B says hi 1 times 4444"
class DR(m.D_Repeat):
def unlucky_number(self):
return 123
def lucky_number(self):
return 42.0
for obj in [m.D_Repeat(), m.D_Tpl()]:
assert obj.say_something(3) == "B says hi 3 times"
assert obj.unlucky_number() == 4444
assert obj.lucky_number() == 888.0
assert obj.say_everything() == "B says hi 1 times 4444"
obj = DR()
assert obj.say_something(3) == "B says hi 3 times"
assert obj.unlucky_number() == 123
assert obj.lucky_number() == 42.0
assert obj.say_everything() == "B says hi 1 times 123"
class DT(m.D_Tpl):
def say_something(self, times):
return "DT says:" + (' quack' * times)
def unlucky_number(self):
return 1234
def lucky_number(self):
return -4.25
obj = DT()
assert obj.say_something(3) == "DT says: quack quack quack"
assert obj.unlucky_number() == 1234
assert obj.lucky_number() == -4.25
assert obj.say_everything() == "DT says: quack 1234"
class DT2(DT):
def say_something(self, times):
return "DT2: " + ('QUACK' * times)
def unlucky_number(self):
return -3
class BT(m.B_Tpl):
def say_something(self, times):
return "BT" * times
def unlucky_number(self):
return -7
def lucky_number(self):
return -1.375
obj = BT()
assert obj.say_something(3) == "BTBTBT"
assert obj.unlucky_number() == -7
assert obj.lucky_number() == -1.375
assert obj.say_everything() == "BT -7"
def test_issue_1454():
# Fix issue #1454 (crash when acquiring/releasing GIL on another thread in Python 2.7)
m.test_gil()
m.test_gil_from_thread()

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