pybind11/tests/test_smart_ptr.py

318 lines
9.3 KiB
Python

from __future__ import annotations
import pytest
m = pytest.importorskip("pybind11_tests.smart_ptr")
from pybind11_tests import ConstructorStats # noqa: E402
def test_smart_ptr(capture):
# Object1
for i, o in enumerate(
[m.make_object_1(), m.make_object_2(), m.MyObject1(3)], start=1
):
assert o.getRefCount() == 1
with capture:
m.print_object_1(o)
m.print_object_2(o)
m.print_object_3(o)
m.print_object_4(o)
assert capture == f"MyObject1[{i}]\n" * 4
for i, o in enumerate(
[m.make_myobject1_1(), m.make_myobject1_2(), m.MyObject1(6), 7], start=4
):
print(o)
with capture:
if not isinstance(o, int):
m.print_object_1(o)
m.print_object_2(o)
m.print_object_3(o)
m.print_object_4(o)
m.print_myobject1_1(o)
m.print_myobject1_2(o)
m.print_myobject1_3(o)
m.print_myobject1_4(o)
times = 4 if isinstance(o, int) else 8
assert capture == f"MyObject1[{i}]\n" * times
cstats = ConstructorStats.get(m.MyObject1)
assert cstats.alive() == 0
expected_values = [f"MyObject1[{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
for i, o in zip(
[8, 6, 7], [m.MyObject2(8), m.make_myobject2_1(), m.make_myobject2_2()]
):
print(o)
with capture:
m.print_myobject2_1(o)
m.print_myobject2_2(o)
m.print_myobject2_3(o)
m.print_myobject2_4(o)
assert capture == f"MyObject2[{i}]\n" * 4
cstats = ConstructorStats.get(m.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
for i, o in zip(
[9, 8, 9], [m.MyObject3(9), m.make_myobject3_1(), m.make_myobject3_2()]
):
print(o)
with capture:
m.print_myobject3_1(o)
m.print_myobject3_2(o)
m.print_myobject3_3(o)
m.print_myobject3_4(o)
assert capture == f"MyObject3[{i}]\n" * 4
cstats = ConstructorStats.get(m.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
cstats = ConstructorStats.get(m.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
# ref<>
cstats = m.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():
assert m.test_object1_refcounting()
def test_unique_nodelete():
o = m.MyObject4(23)
assert o.value == 23
cstats = ConstructorStats.get(m.MyObject4)
assert cstats.alive() == 1
del o
assert cstats.alive() == 1
m.MyObject4.cleanup_all_instances()
assert cstats.alive() == 0
def test_unique_nodelete4a():
o = m.MyObject4a(23)
assert o.value == 23
cstats = ConstructorStats.get(m.MyObject4a)
assert cstats.alive() == 1
del o
assert cstats.alive() == 1
m.MyObject4a.cleanup_all_instances()
assert cstats.alive() == 0
def test_unique_deleter():
m.MyObject4a(0)
o = m.MyObject4b(23)
assert o.value == 23
cstats4a = ConstructorStats.get(m.MyObject4a)
assert cstats4a.alive() == 2
cstats4b = ConstructorStats.get(m.MyObject4b)
assert cstats4b.alive() == 1
del o
assert cstats4a.alive() == 1 # Should now only be one leftover
assert cstats4b.alive() == 0 # Should be deleted
m.MyObject4a.cleanup_all_instances()
assert cstats4a.alive() == 0
assert cstats4b.alive() == 0
def test_large_holder():
o = m.MyObject5(5)
assert o.value == 5
cstats = ConstructorStats.get(m.MyObject5)
assert cstats.alive() == 1
del o
assert cstats.alive() == 0
def test_shared_ptr_and_references():
s = m.SharedPtrRef()
stats = ConstructorStats.get(m.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():
s = m.SharedFromThisRef()
stats = ConstructorStats.get(m.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
z = m.SharedFromThisVirt.get()
y = m.SharedFromThisVirt.get()
assert y is z
def test_move_only_holder():
a = m.TypeWithMoveOnlyHolder.make()
b = m.TypeWithMoveOnlyHolder.make_as_object()
stats = ConstructorStats.get(m.TypeWithMoveOnlyHolder)
assert stats.alive() == 2
del b
assert stats.alive() == 1
del a
assert stats.alive() == 0
def test_holder_with_addressof_operator():
# this test must not throw exception from c++
a = m.TypeForHolderWithAddressOf.make()
a.print_object_1()
a.print_object_2()
a.print_object_3()
a.print_object_4()
stats = ConstructorStats.get(m.TypeForHolderWithAddressOf)
assert stats.alive() == 1
np = m.TypeForHolderWithAddressOf.make()
assert stats.alive() == 2
del a
assert stats.alive() == 1
del np
assert stats.alive() == 0
b = m.TypeForHolderWithAddressOf.make()
c = b
assert b.get() is c.get()
assert stats.alive() == 1
del b
assert stats.alive() == 1
del c
assert stats.alive() == 0
def test_move_only_holder_with_addressof_operator():
a = m.TypeForMoveOnlyHolderWithAddressOf.make()
a.print_object()
stats = ConstructorStats.get(m.TypeForMoveOnlyHolderWithAddressOf)
assert stats.alive() == 1
a.value = 42
assert a.value == 42
del a
assert stats.alive() == 0
def test_smart_ptr_from_default():
instance = m.HeldByDefaultHolder()
with pytest.raises(RuntimeError) as excinfo:
m.HeldByDefaultHolder.load_shared_ptr(instance)
assert (
"Unable to load a custom holder type from a "
"default-holder instance" in str(excinfo.value)
)
def test_shared_ptr_gc():
"""#187: issue involving std::shared_ptr<> return value policy & garbage collection"""
el = m.ElementList()
for i in range(10):
el.add(m.ElementA(i))
pytest.gc_collect()
for i, v in enumerate(el.get()):
assert i == v.value()