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import pytest
from pybind11_tests import ConstructorStats
def test_smart_ptr(capture):
# Object1
from pybind11_tests import (MyObject1, make_object_1, make_object_2,
print_object_1, print_object_2, print_object_3, print_object_4)
for i, o in enumerate([make_object_1(), make_object_2(), MyObject1(3)], start=1):
assert o.getRefCount() == 1
with capture:
print_object_1(o)
print_object_2(o)
print_object_3(o)
print_object_4(o)
assert capture == "MyObject1[{i}]\n".format(i=i) * 4
from pybind11_tests import (make_myobject1_1, make_myobject1_2,
print_myobject1_1, print_myobject1_2,
print_myobject1_3, print_myobject1_4)
for i, o in enumerate([make_myobject1_1(), make_myobject1_2(), MyObject1(6), 7], start=4):
print(o)
with capture:
if not isinstance(o, int):
print_object_1(o)
print_object_2(o)
print_object_3(o)
print_object_4(o)
print_myobject1_1(o)
print_myobject1_2(o)
print_myobject1_3(o)
print_myobject1_4(o)
assert capture == "MyObject1[{i}]\n".format(i=i) * (4 if isinstance(o, int) else 8)
cstats = ConstructorStats.get(MyObject1)
assert cstats.alive() == 0
expected_values = ['MyObject1[{}]'.format(i) for i in range(1, 7)] + ['MyObject1[7]'] * 4
assert cstats.values() == expected_values
assert cstats.default_constructions == 0
assert cstats.copy_constructions == 0
# assert cstats.move_constructions >= 0 # Doesn't invoke any
assert cstats.copy_assignments == 0
assert cstats.move_assignments == 0
# Object2
from pybind11_tests import (MyObject2, make_myobject2_1, make_myobject2_2,
make_myobject3_1, make_myobject3_2,
print_myobject2_1, print_myobject2_2,
print_myobject2_3, print_myobject2_4)
for i, o in zip([8, 6, 7], [MyObject2(8), make_myobject2_1(), make_myobject2_2()]):
print(o)
with capture:
print_myobject2_1(o)
print_myobject2_2(o)
print_myobject2_3(o)
print_myobject2_4(o)
assert capture == "MyObject2[{i}]\n".format(i=i) * 4
cstats = ConstructorStats.get(MyObject2)
assert cstats.alive() == 1
o = None
assert cstats.alive() == 0
assert cstats.values() == ['MyObject2[8]', 'MyObject2[6]', 'MyObject2[7]']
assert cstats.default_constructions == 0
assert cstats.copy_constructions == 0
# assert cstats.move_constructions >= 0 # Doesn't invoke any
assert cstats.copy_assignments == 0
assert cstats.move_assignments == 0
# Object3
from pybind11_tests import (MyObject3, print_myobject3_1, print_myobject3_2,
print_myobject3_3, print_myobject3_4)
for i, o in zip([9, 8, 9], [MyObject3(9), make_myobject3_1(), make_myobject3_2()]):
print(o)
with capture:
print_myobject3_1(o)
print_myobject3_2(o)
print_myobject3_3(o)
print_myobject3_4(o)
assert capture == "MyObject3[{i}]\n".format(i=i) * 4
cstats = ConstructorStats.get(MyObject3)
assert cstats.alive() == 1
o = None
assert cstats.alive() == 0
assert cstats.values() == ['MyObject3[9]', 'MyObject3[8]', 'MyObject3[9]']
assert cstats.default_constructions == 0
assert cstats.copy_constructions == 0
# assert cstats.move_constructions >= 0 # Doesn't invoke any
assert cstats.copy_assignments == 0
assert cstats.move_assignments == 0
# Object and ref
from pybind11_tests import Object, cstats_ref
cstats = ConstructorStats.get(Object)
assert cstats.alive() == 0
assert cstats.values() == []
assert cstats.default_constructions == 10
assert cstats.copy_constructions == 0
# assert cstats.move_constructions >= 0 # Doesn't invoke any
assert cstats.copy_assignments == 0
assert cstats.move_assignments == 0
cstats = cstats_ref()
assert cstats.alive() == 0
assert cstats.values() == ['from pointer'] * 10
assert cstats.default_constructions == 30
assert cstats.copy_constructions == 12
# assert cstats.move_constructions >= 0 # Doesn't invoke any
assert cstats.copy_assignments == 30
assert cstats.move_assignments == 0
def test_smart_ptr_refcounting():
from pybind11_tests import test_object1_refcounting
assert test_object1_refcounting()
def test_unique_nodelete():
from pybind11_tests import MyObject4
o = MyObject4(23)
assert o.value == 23
cstats = ConstructorStats.get(MyObject4)
assert cstats.alive() == 1
del o
cstats = ConstructorStats.get(MyObject4)
assert cstats.alive() == 1 # Leak, but that's intentional
def test_shared_ptr_and_references():
from pybind11_tests.smart_ptr import SharedPtrRef, A
s = SharedPtrRef()
stats = ConstructorStats.get(A)
assert stats.alive() == 2
ref = s.ref # init_holder_helper(holder_ptr=false, owned=false)
assert stats.alive() == 2
assert s.set_ref(ref)
with pytest.raises(RuntimeError) as excinfo:
assert s.set_holder(ref)
assert "Unable to cast from non-held to held instance" in str(excinfo.value)
copy = s.copy # init_holder_helper(holder_ptr=false, owned=true)
assert stats.alive() == 3
assert s.set_ref(copy)
assert s.set_holder(copy)
holder_ref = s.holder_ref # init_holder_helper(holder_ptr=true, owned=false)
assert stats.alive() == 3
assert s.set_ref(holder_ref)
assert s.set_holder(holder_ref)
holder_copy = s.holder_copy # init_holder_helper(holder_ptr=true, owned=true)
assert stats.alive() == 3
assert s.set_ref(holder_copy)
assert s.set_holder(holder_copy)
del ref, copy, holder_ref, holder_copy, s
assert stats.alive() == 0
def test_shared_ptr_from_this_and_references():
from pybind11_tests.smart_ptr import SharedFromThisRef, B
s = SharedFromThisRef()
stats = ConstructorStats.get(B)
assert stats.alive() == 2
ref = s.ref # init_holder_helper(holder_ptr=false, owned=false, bad_wp=false)
assert stats.alive() == 2
assert s.set_ref(ref)
assert s.set_holder(ref) # std::enable_shared_from_this can create a holder from a reference
bad_wp = s.bad_wp # init_holder_helper(holder_ptr=false, owned=false, bad_wp=true)
assert stats.alive() == 2
assert s.set_ref(bad_wp)
with pytest.raises(RuntimeError) as excinfo:
assert s.set_holder(bad_wp)
assert "Unable to cast from non-held to held instance" in str(excinfo.value)
copy = s.copy # init_holder_helper(holder_ptr=false, owned=true, bad_wp=false)
assert stats.alive() == 3
assert s.set_ref(copy)
assert s.set_holder(copy)
holder_ref = s.holder_ref # init_holder_helper(holder_ptr=true, owned=false, bad_wp=false)
assert stats.alive() == 3
assert s.set_ref(holder_ref)
assert s.set_holder(holder_ref)
holder_copy = s.holder_copy # init_holder_helper(holder_ptr=true, owned=true, bad_wp=false)
assert stats.alive() == 3
assert s.set_ref(holder_copy)
assert s.set_holder(holder_copy)
del ref, bad_wp, copy, holder_ref, holder_copy, s
assert stats.alive() == 0
def test_move_only_holder():
from pybind11_tests.smart_ptr import TypeWithMoveOnlyHolder
a = TypeWithMoveOnlyHolder.make()
stats = ConstructorStats.get(TypeWithMoveOnlyHolder)
assert stats.alive() == 1
del a
assert stats.alive() == 0
def test_smart_ptr_from_default():
from pybind11_tests.smart_ptr import HeldByDefaultHolder
instance = HeldByDefaultHolder()
with pytest.raises(RuntimeError) as excinfo:
HeldByDefaultHolder.load_shared_ptr(instance)
assert "Unable to load a custom holder type from a default-holder instance" in str(excinfo)
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