| import pytest |
| import re |
| |
| from pybind11_tests import factory_constructors as m |
| from pybind11_tests.factory_constructors import tag |
| from pybind11_tests import ConstructorStats |
| |
| |
| def test_init_factory_basic(): |
| """Tests py::init_factory() wrapper around various ways of returning the object""" |
| |
| cstats = [ConstructorStats.get(c) for c in [m.TestFactory1, m.TestFactory2, m.TestFactory3]] |
| cstats[0].alive() # force gc |
| n_inst = ConstructorStats.detail_reg_inst() |
| |
| x1 = m.TestFactory1(tag.unique_ptr, 3) |
| assert x1.value == "3" |
| y1 = m.TestFactory1(tag.pointer) |
| assert y1.value == "(empty)" |
| z1 = m.TestFactory1("hi!") |
| assert z1.value == "hi!" |
| |
| assert ConstructorStats.detail_reg_inst() == n_inst + 3 |
| |
| x2 = m.TestFactory2(tag.move) |
| assert x2.value == "(empty2)" |
| y2 = m.TestFactory2(tag.pointer, 7) |
| assert y2.value == "7" |
| z2 = m.TestFactory2(tag.unique_ptr, "hi again") |
| assert z2.value == "hi again" |
| |
| assert ConstructorStats.detail_reg_inst() == n_inst + 6 |
| |
| x3 = m.TestFactory3(tag.shared_ptr) |
| assert x3.value == "(empty3)" |
| y3 = m.TestFactory3(tag.pointer, 42) |
| assert y3.value == "42" |
| z3 = m.TestFactory3("bye") |
| assert z3.value == "bye" |
| |
| with pytest.raises(TypeError) as excinfo: |
| m.TestFactory3(tag.null_ptr) |
| assert str(excinfo.value) == "pybind11::init(): factory function returned nullptr" |
| |
| assert [i.alive() for i in cstats] == [3, 3, 3] |
| assert ConstructorStats.detail_reg_inst() == n_inst + 9 |
| |
| del x1, y2, y3, z3 |
| assert [i.alive() for i in cstats] == [2, 2, 1] |
| assert ConstructorStats.detail_reg_inst() == n_inst + 5 |
| del x2, x3, y1, z1, z2 |
| assert [i.alive() for i in cstats] == [0, 0, 0] |
| assert ConstructorStats.detail_reg_inst() == n_inst |
| |
| assert [i.values() for i in cstats] == [ |
| ["3", "hi!"], |
| ["7", "hi again"], |
| ["42", "bye"] |
| ] |
| assert [i.default_constructions for i in cstats] == [1, 1, 1] |
| |
| |
| def test_init_factory_signature(msg): |
| with pytest.raises(TypeError) as excinfo: |
| m.TestFactory1("invalid", "constructor", "arguments") |
| assert msg(excinfo.value) == """ |
| __init__(): incompatible constructor arguments. The following argument types are supported: |
| 1. m.factory_constructors.TestFactory1(arg0: m.factory_constructors.tag.unique_ptr_tag, arg1: int) |
| 2. m.factory_constructors.TestFactory1(arg0: str) |
| 3. m.factory_constructors.TestFactory1(arg0: m.factory_constructors.tag.pointer_tag) |
| 4. m.factory_constructors.TestFactory1(arg0: handle, arg1: int, arg2: handle) |
| |
| Invoked with: 'invalid', 'constructor', 'arguments' |
| """ # noqa: E501 line too long |
| |
| assert msg(m.TestFactory1.__init__.__doc__) == """ |
| __init__(*args, **kwargs) |
| Overloaded function. |
| |
| 1. __init__(self: m.factory_constructors.TestFactory1, arg0: m.factory_constructors.tag.unique_ptr_tag, arg1: int) -> None |
| |
| 2. __init__(self: m.factory_constructors.TestFactory1, arg0: str) -> None |
| |
| 3. __init__(self: m.factory_constructors.TestFactory1, arg0: m.factory_constructors.tag.pointer_tag) -> None |
| |
| 4. __init__(self: m.factory_constructors.TestFactory1, arg0: handle, arg1: int, arg2: handle) -> None |
| """ # noqa: E501 line too long |
| |
| |
| def test_init_factory_casting(): |
| """Tests py::init_factory() wrapper with various upcasting and downcasting returns""" |
| |
| cstats = [ConstructorStats.get(c) for c in [m.TestFactory3, m.TestFactory4, m.TestFactory5]] |
| cstats[0].alive() # force gc |
| n_inst = ConstructorStats.detail_reg_inst() |
| |
| # Construction from derived references: |
| a = m.TestFactory3(tag.pointer, tag.TF4, 4) |
| assert a.value == "4" |
| b = m.TestFactory3(tag.shared_ptr, tag.TF4, 5) |
| assert b.value == "5" |
| c = m.TestFactory3(tag.pointer, tag.TF5, 6) |
| assert c.value == "6" |
| d = m.TestFactory3(tag.shared_ptr, tag.TF5, 7) |
| assert d.value == "7" |
| |
| assert ConstructorStats.detail_reg_inst() == n_inst + 4 |
| |
| # Shared a lambda with TF3: |
| e = m.TestFactory4(tag.pointer, tag.TF4, 8) |
| assert e.value == "8" |
| |
| assert ConstructorStats.detail_reg_inst() == n_inst + 5 |
| assert [i.alive() for i in cstats] == [5, 3, 2] |
| |
| del a |
| assert [i.alive() for i in cstats] == [4, 2, 2] |
| assert ConstructorStats.detail_reg_inst() == n_inst + 4 |
| |
| del b, c, e |
| assert [i.alive() for i in cstats] == [1, 0, 1] |
| assert ConstructorStats.detail_reg_inst() == n_inst + 1 |
| |
| del d |
| assert [i.alive() for i in cstats] == [0, 0, 0] |
| assert ConstructorStats.detail_reg_inst() == n_inst |
| |
| assert [i.values() for i in cstats] == [ |
| ["4", "5", "6", "7", "8"], |
| ["4", "5", "8"], |
| ["6", "7"] |
| ] |
| |
| |
| def test_init_factory_alias(): |
| """Tests py::init_factory() wrapper with value conversions and alias types""" |
| |
| cstats = [m.TestFactory6.get_cstats(), m.TestFactory6.get_alias_cstats()] |
| cstats[0].alive() # force gc |
| n_inst = ConstructorStats.detail_reg_inst() |
| |
| a = m.TestFactory6(tag.base, 1) |
| assert a.get() == 1 |
| assert not a.has_alias() |
| b = m.TestFactory6(tag.alias, "hi there") |
| assert b.get() == 8 |
| assert b.has_alias() |
| c = m.TestFactory6(tag.alias, 3) |
| assert c.get() == 3 |
| assert c.has_alias() |
| d = m.TestFactory6(tag.alias, tag.pointer, 4) |
| assert d.get() == 4 |
| assert d.has_alias() |
| e = m.TestFactory6(tag.base, tag.pointer, 5) |
| assert e.get() == 5 |
| assert not e.has_alias() |
| f = m.TestFactory6(tag.base, tag.alias, tag.pointer, 6) |
| assert f.get() == 6 |
| assert f.has_alias() |
| |
| assert ConstructorStats.detail_reg_inst() == n_inst + 6 |
| assert [i.alive() for i in cstats] == [6, 4] |
| |
| del a, b, e |
| assert [i.alive() for i in cstats] == [3, 3] |
| assert ConstructorStats.detail_reg_inst() == n_inst + 3 |
| del f, c, d |
| assert [i.alive() for i in cstats] == [0, 0] |
| assert ConstructorStats.detail_reg_inst() == n_inst |
| |
| class MyTest(m.TestFactory6): |
| def __init__(self, *args): |
| m.TestFactory6.__init__(self, *args) |
| |
| def get(self): |
| return -5 + m.TestFactory6.get(self) |
| |
| # Return Class by value, moved into new alias: |
| z = MyTest(tag.base, 123) |
| assert z.get() == 118 |
| assert z.has_alias() |
| |
| # Return alias by value, moved into new alias: |
| y = MyTest(tag.alias, "why hello!") |
| assert y.get() == 5 |
| assert y.has_alias() |
| |
| # Return Class by pointer, moved into new alias then original destroyed: |
| x = MyTest(tag.base, tag.pointer, 47) |
| assert x.get() == 42 |
| assert x.has_alias() |
| |
| assert ConstructorStats.detail_reg_inst() == n_inst + 3 |
| assert [i.alive() for i in cstats] == [3, 3] |
| del x, y, z |
| assert [i.alive() for i in cstats] == [0, 0] |
| assert ConstructorStats.detail_reg_inst() == n_inst |
| |
| assert [i.values() for i in cstats] == [ |
| ["1", "8", "3", "4", "5", "6", "123", "10", "47"], |
| ["hi there", "3", "4", "6", "move", "123", "why hello!", "move", "47"] |
| ] |
| |
| |
| def test_init_factory_dual(): |
| """Tests init factory functions with dual main/alias factory functions""" |
| from pybind11_tests.factory_constructors import TestFactory7 |
| |
| cstats = [TestFactory7.get_cstats(), TestFactory7.get_alias_cstats()] |
| cstats[0].alive() # force gc |
| n_inst = ConstructorStats.detail_reg_inst() |
| |
| class PythFactory7(TestFactory7): |
| def get(self): |
| return 100 + TestFactory7.get(self) |
| |
| a1 = TestFactory7(1) |
| a2 = PythFactory7(2) |
| assert a1.get() == 1 |
| assert a2.get() == 102 |
| assert not a1.has_alias() |
| assert a2.has_alias() |
| |
| b1 = TestFactory7(tag.pointer, 3) |
| b2 = PythFactory7(tag.pointer, 4) |
| assert b1.get() == 3 |
| assert b2.get() == 104 |
| assert not b1.has_alias() |
| assert b2.has_alias() |
| |
| c1 = TestFactory7(tag.mixed, 5) |
| c2 = PythFactory7(tag.mixed, 6) |
| assert c1.get() == 5 |
| assert c2.get() == 106 |
| assert not c1.has_alias() |
| assert c2.has_alias() |
| |
| d1 = TestFactory7(tag.base, tag.pointer, 7) |
| d2 = PythFactory7(tag.base, tag.pointer, 8) |
| assert d1.get() == 7 |
| assert d2.get() == 108 |
| assert not d1.has_alias() |
| assert d2.has_alias() |
| |
| # Both return an alias; the second multiplies the value by 10: |
| e1 = TestFactory7(tag.alias, tag.pointer, 9) |
| e2 = PythFactory7(tag.alias, tag.pointer, 10) |
| assert e1.get() == 9 |
| assert e2.get() == 200 |
| assert e1.has_alias() |
| assert e2.has_alias() |
| |
| f1 = TestFactory7(tag.shared_ptr, tag.base, 11) |
| f2 = PythFactory7(tag.shared_ptr, tag.base, 12) |
| assert f1.get() == 11 |
| assert f2.get() == 112 |
| assert not f1.has_alias() |
| assert f2.has_alias() |
| |
| g1 = TestFactory7(tag.shared_ptr, tag.invalid_base, 13) |
| assert g1.get() == 13 |
| assert not g1.has_alias() |
| with pytest.raises(TypeError) as excinfo: |
| PythFactory7(tag.shared_ptr, tag.invalid_base, 14) |
| assert (str(excinfo.value) == |
| "pybind11::init(): construction failed: returned holder-wrapped instance is not an " |
| "alias instance") |
| |
| assert [i.alive() for i in cstats] == [13, 7] |
| assert ConstructorStats.detail_reg_inst() == n_inst + 13 |
| |
| del a1, a2, b1, d1, e1, e2 |
| assert [i.alive() for i in cstats] == [7, 4] |
| assert ConstructorStats.detail_reg_inst() == n_inst + 7 |
| del b2, c1, c2, d2, f1, f2, g1 |
| assert [i.alive() for i in cstats] == [0, 0] |
| assert ConstructorStats.detail_reg_inst() == n_inst |
| |
| assert [i.values() for i in cstats] == [ |
| ["1", "2", "3", "4", "5", "6", "7", "8", "9", "100", "11", "12", "13", "14"], |
| ["2", "4", "6", "8", "9", "100", "12"] |
| ] |
| |
| |
| def test_no_placement_new(capture): |
| """Prior to 2.2, `py::init<...>` relied on the type supporting placement |
| new; this tests a class without placement new support.""" |
| with capture: |
| a = m.NoPlacementNew(123) |
| |
| found = re.search(r'^operator new called, returning (\d+)\n$', str(capture)) |
| assert found |
| assert a.i == 123 |
| with capture: |
| del a |
| pytest.gc_collect() |
| assert capture == "operator delete called on " + found.group(1) |
| |
| with capture: |
| b = m.NoPlacementNew() |
| |
| found = re.search(r'^operator new called, returning (\d+)\n$', str(capture)) |
| assert found |
| assert b.i == 100 |
| with capture: |
| del b |
| pytest.gc_collect() |
| assert capture == "operator delete called on " + found.group(1) |
| |
| |
| def test_multiple_inheritance(): |
| class MITest(m.TestFactory1, m.TestFactory2): |
| def __init__(self): |
| m.TestFactory1.__init__(self, tag.unique_ptr, 33) |
| m.TestFactory2.__init__(self, tag.move) |
| |
| a = MITest() |
| assert m.TestFactory1.value.fget(a) == "33" |
| assert m.TestFactory2.value.fget(a) == "(empty2)" |
| |
| |
| def create_and_destroy(*args): |
| a = m.NoisyAlloc(*args) |
| print("---") |
| del a |
| pytest.gc_collect() |
| |
| |
| def strip_comments(s): |
| return re.sub(r'\s+#.*', '', s) |
| |
| |
| def test_reallocations(capture, msg): |
| """When the constructor is overloaded, previous overloads can require a preallocated value. |
| This test makes sure that such preallocated values only happen when they might be necessary, |
| and that they are deallocated properly""" |
| |
| pytest.gc_collect() |
| |
| with capture: |
| create_and_destroy(1) |
| assert msg(capture) == """ |
| noisy new |
| noisy placement new |
| NoisyAlloc(int 1) |
| --- |
| ~NoisyAlloc() |
| noisy delete |
| """ |
| with capture: |
| create_and_destroy(1.5) |
| assert msg(capture) == strip_comments(""" |
| noisy new # allocation required to attempt first overload |
| noisy delete # have to dealloc before considering factory init overload |
| noisy new # pointer factory calling "new", part 1: allocation |
| NoisyAlloc(double 1.5) # ... part two, invoking constructor |
| --- |
| ~NoisyAlloc() # Destructor |
| noisy delete # operator delete |
| """) |
| |
| with capture: |
| create_and_destroy(2, 3) |
| assert msg(capture) == strip_comments(""" |
| noisy new # pointer factory calling "new", allocation |
| NoisyAlloc(int 2) # constructor |
| --- |
| ~NoisyAlloc() # Destructor |
| noisy delete # operator delete |
| """) |
| |
| with capture: |
| create_and_destroy(2.5, 3) |
| assert msg(capture) == strip_comments(""" |
| NoisyAlloc(double 2.5) # construction (local func variable: operator_new not called) |
| noisy new # return-by-value "new" part 1: allocation |
| ~NoisyAlloc() # moved-away local func variable destruction |
| --- |
| ~NoisyAlloc() # Destructor |
| noisy delete # operator delete |
| """) |
| |
| with capture: |
| create_and_destroy(3.5, 4.5) |
| assert msg(capture) == strip_comments(""" |
| noisy new # preallocation needed before invoking placement-new overload |
| noisy placement new # Placement new |
| NoisyAlloc(double 3.5) # construction |
| --- |
| ~NoisyAlloc() # Destructor |
| noisy delete # operator delete |
| """) |
| |
| with capture: |
| create_and_destroy(4, 0.5) |
| assert msg(capture) == strip_comments(""" |
| noisy new # preallocation needed before invoking placement-new overload |
| noisy delete # deallocation of preallocated storage |
| noisy new # Factory pointer allocation |
| NoisyAlloc(int 4) # factory pointer construction |
| --- |
| ~NoisyAlloc() # Destructor |
| noisy delete # operator delete |
| """) |
| |
| with capture: |
| create_and_destroy(5, "hi") |
| assert msg(capture) == strip_comments(""" |
| noisy new # preallocation needed before invoking first placement new |
| noisy delete # delete before considering new-style constructor |
| noisy new # preallocation for second placement new |
| noisy placement new # Placement new in the second placement new overload |
| NoisyAlloc(int 5) # construction |
| --- |
| ~NoisyAlloc() # Destructor |
| noisy delete # operator delete |
| """) |
| |
| |
| @pytest.unsupported_on_py2 |
| def test_invalid_self(): |
| """Tests invocation of the pybind-registered base class with an invalid `self` argument. You |
| can only actually do this on Python 3: Python 2 raises an exception itself if you try.""" |
| class NotPybindDerived(object): |
| pass |
| |
| # Attempts to initialize with an invalid type passed as `self`: |
| class BrokenTF1(m.TestFactory1): |
| def __init__(self, bad): |
| if bad == 1: |
| a = m.TestFactory2(tag.pointer, 1) |
| m.TestFactory1.__init__(a, tag.pointer) |
| elif bad == 2: |
| a = NotPybindDerived() |
| m.TestFactory1.__init__(a, tag.pointer) |
| |
| # Same as above, but for a class with an alias: |
| class BrokenTF6(m.TestFactory6): |
| def __init__(self, bad): |
| if bad == 1: |
| a = m.TestFactory2(tag.pointer, 1) |
| m.TestFactory6.__init__(a, tag.base, 1) |
| elif bad == 2: |
| a = m.TestFactory2(tag.pointer, 1) |
| m.TestFactory6.__init__(a, tag.alias, 1) |
| elif bad == 3: |
| m.TestFactory6.__init__(NotPybindDerived.__new__(NotPybindDerived), tag.base, 1) |
| elif bad == 4: |
| m.TestFactory6.__init__(NotPybindDerived.__new__(NotPybindDerived), tag.alias, 1) |
| |
| for arg in (1, 2): |
| with pytest.raises(TypeError) as excinfo: |
| BrokenTF1(arg) |
| assert str(excinfo.value) == "__init__(self, ...) called with invalid `self` argument" |
| |
| for arg in (1, 2, 3, 4): |
| with pytest.raises(TypeError) as excinfo: |
| BrokenTF6(arg) |
| assert str(excinfo.value) == "__init__(self, ...) called with invalid `self` argument" |
